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2003353

Nokia BSC/TCSM S11.5 ProductDocumentation

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The information in this documentation is subject to change without notice and describes only theproduct defined in the introduction of this documentation. This documentation is intended for theuse of Nokia's customers only for the purposes of the agreement under which the documentationis submitted, and no part of it may be reproduced or transmitted in any form or means without theprior written permission of Nokia. The documentation has been prepared to be used byprofessional and properly trained personnel, and the customer assumes full responsibility whenusing it. Nokia welcomes customer comments as part of the process of continuous developmentand improvement of the documentation.

The information or statements given in this documentation concerning the suitability, capacity, or performance of the mentioned hardware or software products cannot be considered binding butshall be defined in the agreement made between Nokia and the customer. However, Nokia hasmade all reasonable efforts to ensure that the instructions contained in the documentation areadequate and free of material errors and omissions. Nokia will, if necessary, explain issueswhich may not be covered by the documentation.

Nokia's liability for any errors in the documentation is limited to the documentary correction of errors. NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THISDOCUMENTATION OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL(INCLUDING MONETARY LOSSES), that might arise from the use of this documentation or the

information in it.

This documentation and the product it describes are considered protected by copyrightaccording to the applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this documentation may be trademarks of their respectivecompanies, and they are mentioned for identification purposes only.

Copyright © Nokia Corporation 2005. All rights reserved.

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Contents

Contents 3

List of tables 4

List of figures 5

Summary of changes 9

1 1 Traffic Measurement 11

2 Counters of Traffic Measurement 25

3 Signalling charts of Traffic Measurement 135

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Contents

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List of tables

Table 1. Measurement description of Traffic Measurement 11

Table 2. SDCCH attempts counters 11

Table 3. SDCCH success counters 12

Table 4. SDCCH failure counters 12

Table 5. TCH requests and attempts counters 13

Table 6. TCH success counters 15

Table 7. TCH failure counters 17

Table 8. Other counters 20

Table 9. GPRS counters 21

Table 10. Spare counters 22

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List of figures

Figure 1. Basic call without counters. 136

Figure 2. Basic call with counters. 137

Figure 3. Basic call with priority subscriber. 138

Figure 4. FACCH call setup due to SDCCH congestion without counters. 139

Figure 5. FACCH call setup due to SDCCH congestion with counters. 140

Figure 6. FACCH call setup due to SDCCH congestion, no free TCH channel.Optional software directed retry is not activated. 141

Figure 7. Normal release. 142

Figure 8. Basic call, no free TCH and queuing or directed retry is not allowed. 143

Figure 9. Successful TCH queuing. 144

Figure 10. Basic call, no free TCHs, unsuccessful queuing and directed retry notactivated. 145

Figure 11. TCH assignment failure with cause switch_circuit_pool  , queuing anddirected retry not allowed. 146

Figure 12. Unsuccessful TCH activation. 147

Figure 13. Unsuccessful TCH activation, t imer expires while waiting for  CHANNEL_ACTIVATION_ACK message. 148

Figure 14. TCH assignment failure. 149

Figure 15. TCH assignment failure, MSC sends CLEAR_COMMAND message. 150

Figure 16. CONNECTION_FAILURE message with cause transcoder_failure  duringa call. 151

Figure 17. TRX or TSL is blocked with different causes during a call. 152

Figure 18. SDCCH congestion, FACCH call setup is not activated. 153

Figure 19. Unsuccessful SDCCH activation. 154

Figure 20. Unsuccessful SDCCH activation, timer expires while waiting for CHANNEL_ACTIVATION_ACK message. 155

Figure 21. Connection failure during SDCCH assignment. 156

Figure 22. SDCCH assignment failure. 157

Figure 23. Unsuccessful SDCCH activation, timer expires while waiting for PHYSICAL_CONTEXT_CONFIRM message. 158

Figure 24. TRX/TSL is blocked with different causes during an SDCCH channel

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activation. 159

Figure 25. Successful trunk reservation. Counters updated: 001040, 001041 andbasic call counters, see Figure 2. 160

Figure 26. Unsuccessful trunk reservation. 161

Figure 27. Successful internal intra-cell handover. Counters 001090 and 001091 areupdated only with underlay overlay handover. 162

Figure 28. Internal intra-cell HO, successful TCH queuing. 163

Figure 29. Unsuccessful internal intra-cell handover, timer expires while waiting for CHANNEL_ACTIVATION_ACK message. 165

Figure 30. Unsuccessful internal intra-cell handover, CONNECTION_FAILUREmessage with cause remote_transcoder_failure  comes to the targetchannel. 166

Figure 31. Unsuccessful internal intra-cell handover, timer expires on the sourcechannel, call cleared. 167

Figure 32. Unsuccessful underlay overlay internal intra-cell handover, queuing notallowed. 168

Figure 33. Internal intra-cell handover, unsuccessful TCH queuing. 169

Figure 34. Internal directed retry. 171

Figure 35. Successful internal inter-cell handover. 172

Figure 36. Unsuccessful internal inter-cell handover. 173

Figure 37. Successful external handover, target. 174

Figure 38. Successful external handover, source. 175

Figure 39. Unsuccessful external handover, source BSC, timer expires while waitingfor CLEAR_COMMAND message. 176

Figure 40. Unsuccessful external handover, MS sends a handover failure. 177

Figure 41. Successful traffic reason handover, source. 178

Figure 42. Successful SDCCH internal intra-cell handover. 179

Figure 43. Unsuccessful SDCCH internal intra-cell handover, timer expires whilewaiting for CHANNEL_ACTIVATION_ACK message. 180

Figure 44. Unsuccessful SDCCH internal intra-cell handover, unsuccessful channelactivation. 181

Figure 45. U n s u c c e s s f u l S D C C H i n t e r n a l i n t r a - c e l l h a n d o v e r ,CONNECTION_FAILURE message comes to the target channelduring handover. 182

Figure 46. Successful SDCCH internal inter-cell handover. 183

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Figure 47. Unsuccessful SDCCH internal inter-cell handover, BTS sendsCONNECTION_FAILURE message. 184

Figure 48. Successful SDCCH external handover target. 185

Figure 49. Successful SDCCH external handover source. No counters updating. 185

Figure 50. Unsuccessful SDCCH external handover, timer expires while waiting for CLEAR_COMMAND message. 186

Figure 51. Successful forced release. 187

Figure 52. Unsuccessful forced release. 188

Figure 53. Unsuccessful forced release with external handover. 189

Figure 54. Successful forced handover. 190

Figure 55. Unsuccessful forced handover. 191

Figure 56. Unsuccessful forced handover with external handover. 192

Figure 57. Reconfiguration from TCH to SDCCH. 193

Figure 58. Normal call. 194

Figure 59. Mobile originated HSCSD call setup. 195

Figure 60. Successful internal inter-cell handover for HSCSD, target cell allocationsand activations for three channels. 196

Figure 61. A CONNECTION_FAILURE message which comes during an

HSCSD. 197

Figure 62. Internal intra-cell direct access from a regular DCCH to the super-reuseTRX. Optional software direct access to super-reuse TRX in IUOactivated. 198

Figure 63. Unsuccessful internal intra-cell direct access from regular DCCH to thesuper-reuse TRX due to lack of resources. Optional software directaccess to super-reuse TRX in IUO activated. 199

Figure 64. Timer T3107 expires while waiting for ASSIGNMENT_COMPLETEmessage. 200

Figure 65. Average counter updating. 201Figure 66. Basic call. Optional software dynamic hotspot is activated. 201

Figure 67. Successful handover due to DADL/B. 202

Figure 68. Unsuccessful DADL/B handover due to lack of resources. 202

Figure 69. Successful BSC controlled TRHO. 203

Figure 70. Unsuccessful BSC controlled TRHO. 203

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Summary of changes

Summary of changes

Changes between document issues are cumulative. Therefore, the latest document 

issue contains all changes made to previous issues.

Changes made between issues 9 and 8 1

  New counters 001204  001230 have been added.

Description of the counter number 001003 has been updated.

Counters number 001149 and 001194 have been modified.

Measurement description table has been added.

The name of the document and of Chapter 1 has been changed from BSC 

Counters: Traffic Measurement  to 1 Traffic Measurement.

The document has been revised throughout to comply with the latest 

documentation standards.

Changes made between issues 8 1 and 8

2. Counters

Information updated for counters 001015 and 001088.

Changes made between issues 8 and 7

1. Introduction

The link targets updated.

The new counters 001195 - 001203 added to the counter lists.

2. Counters

The cell titles in the tables updated to conform with the S11 release.

The following new counters added: 001195-001203.

The description of counters 001011, 001013, 001191 - 001194 changed.

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1 1 Traffic Measurement

The BSC traffic measurement registers information related to the stand alone

dedicated control channel (SDCCH) and traffic channels (TCH). The BSC traffic

measurement counters are divided into seven different classes. There are

measurements regarding the number of attempts to seize TCHs and SDCCHs,

successful calls, lengths of the queue, and the reasons for failures. This

measurement collects one set of results for each cell. Signalling charts are drawnwith the accuracy of message interface.

Measurement description

Table 1. Measurement description of Traffic Measurement

Measurement

Measurement ID

Measurement abbreviation

Traffic Measurement

1

TRAFFIC

Product BSC

Product software release S1

Target name BTS

Measurement counters

. SDCCH attempts counters

Table 2. SDCCH attempts counters

Counter Counter number  

Seizure attempts 001000

SDCCH seizure attempts for MOC 001135

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Table 2. SDCCH attempts counters (cont.)

Counter Counter number  

SDCCH seizure attempts for MTC 001136

Dynamic SDCCH reconfiguration attempt 001154

. SDCCH success counters

Table 3. SDCCH success counters

Counter Counter number  

Success seizure for HO 001006

Success seizure for immediate assignment 001007

. SDCCH failure counters

Table 4. SDCCH failure counters

Counter Counter number  

Seizure attempts with busy SDCCH 001001

Transactions failed due to BSS failure 001002

Transactions failed due to radio failure 001003

Transact. failed due radio on source channel during

HO

001004

Transact. failed due radio on target channel during

HO

001005

SDCCH activation failure 001027

SDCCH Abis problems 001033

SDCCH A interface problems 001034

SDCCH LAPD failure 001035

SDCCH BTS failure 001036

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Table 4. SDCCH failure counters (cont.)

Counter Counter number  

SDCCH user actions 001037

SDCCH BCSU reset 001038

SDCCH network actions 001039

SDCCH activation failure call 001072

SDCCH activation failure target 001074

SDCCH Abis failure call 001075

SDCCH Abis failure source 001076

SDCCH Abis failure target 001077

SDCCH A interface failure call 001078

SDCCH A interface failure source 001079

SDCCH A interface failure target 001080

Unsuccess immediate assignment SDCCH attempt 001155

SDCCH failures in phase 3 001201

Error indication messages during Location Update 001203

. TCH requests and attempts counters

Table 5. TCH requests and attempts counters

Counter Counter number  

TCH request success and unsuccess 001010

Call attempts in the queue 001016

Handover attempts in the queue 001017

TCH call request 001026

Trunk reservation invocations 001040

TCH requests FACCH call setup 001043

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Table 5. TCH requests and attempts counters (cont.)

Counter Counter number  

Traffic reason HO requests 001052

Traffic reason HO enquiries 001053

Forced release assign request attempts 001054

Forced HO assign request attempts 001055

Queuing allowed assign request attempts 001056

Queuing not allowed assign request attempts 001057

Forced release HO request attempts 001062

Forced HO HO request attempts 001063

Queuing allowed HO request attempts 001064

Queuing not allowed HO request attempts 001065

TCH requests underlay overlay 001090

TCH seizure underlay overlay 001091

Priority subscriber TCH requests 001095

TCH seizure attempt due SDCCH congestion 001098

Full TCH requests success unsuccess 001102

Half TCH requests success unsuccess 001103

TCH requests full preferred 001104

TCH requests half preferred 001105

Full TCH requests FACCH call 001123

TCH FACCH call channel rate not defined 001124

TCH seizure attempts for MOC 001137

TCH seizure attempts for MTC 001138

Queued urgent handover attempts 001142

TCH requests for 14.4k data calls 001156

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Table 5. TCH requests and attempts counters (cont.)

Counter Counter number  

HSCSD transparent TCH request 001158

HSCSD request for call setup 001160

HSCSD TCH request for HO 001161

TCH request for a BSC controlled TRHO procedure 001167

DADLB start due to exceeded load 001172

TCH requests for AMR call 001184

TCH requests for 9.6k data calls 001189

HO commands in outgoing MSC-controlled handover 001195

HO or assignment commands in outgoing BSC 

controlled handover 

001196

  Assignment commands in intra-BTS handover 001197

. TCH success counters

Table 6. TCH success counters

Counter Counter number  

Success TCH seizure for HO 001008

Success TCH seizure for normal assignment 001009

Success trunk reservation invocations 001041

TCH seizure FACCH call setup 001044

Forced releases 001070

Forced handovers 001071

Priority subscriber success TCH seizure 001096

TCH seizure due SDCCH congestion 001099

Success full TCH seizure 001106

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Table 6. TCH success counters (cont.)

Counter Counter number  

Success half TCH seizure 001107

Full TCH seizure speech ver 1 001108

Full TCH seizure speech ver 2 001109

Full TCH seizure speech ver 3 001110

Half TCH seizure speech ver 1 001111

Half TCH seizure speech ver 2 001112

Half TCH seizure speech ver 3 001113

Full TCH seizure normal assignment 001114

Half TCH seizure normal assignment 001115

Full TCH seizure internal HO channel rate 001116

Half TCH seizure internal HO channel rate 001117

Success full TCH seizure FACCH call 001125

Success half TCH seizure FACCH call 001126

MS success TCH seizure for assignment complete 001148

Calls ended by user during DADL/B setup 001149

Success TCH seizure when good quality in adjacents 001150

Succ TCH seiz when qual betw good and bad in adj 001152

HSCSD success TCH seizure with 14.4 001157

HSCSD success transparent TCH seizure 001159

HSCSD success TCH seizure for call setup 001162

HSCSD success TCH seizure for HO 001163

Success TCH seizure for direct access 001165

Succ TCH seiz for a controlled TRHO 001168

Successful TCH seizures for DADLB HO 001170

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Table 6. TCH success counters (cont.)

Counter Counter number  

Removal from queue due to DR 001173

Successful FR TCH seizures with AMR codecs for 

HO

001182

Successful HR TCH seizures with AMR codecs for 

HO

001183

. TCH failure counters

Table 7. TCH failure counters

Counter Counter number  

TCH request rejected due to lack 001011

Transactions ended due to BSS problem 001012

Transactions ended due to radio failure 001013

Transact. ended due source channel failure during

HO

001014

Transact. ended due target channel failure during HO 001015

Not served queued call attempts 001024

Not served queued HO attempts 001025

TCH activation failure 001028

TCH transcoder failure 001029

TCH transcoder failure source 001030

TCH transcoder failure target 001031

Trunk reservation invocations result refused 001042

TCH Abis problems 001045

TCH LAPD failure 001046

TCH BTS failure 001047

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Table 7. TCH failure counters (cont.)

Counter Counter number  

TCH user actions 001048

TCH BCSU reset 001049

TCH network actions 001050

TCH A interface problems 001051

Forced release assign request failed 001058

Forced HO assign request failed 001059

Queuing allowed assign request failed 001060

Queuing not allowed assign request failed 001061

Forced release HO request failed 001066

Forced HO HO request failed 001067

Queuing allowed HO request failed 001068

Queuing not allowed HO request failed 001069

TCH activation failure call 001081

TCH activation failure target 001083

TCH Abis failure call 001084

TCH Abis failure source 001085

TCH Abis failure target 001086

TCH A interface failure call 001087

TCH A interface failure source 001088

TCH A interface failure target 001089

TCH rejected requests underlay overlay 001092

Non-priority subscriber refused TCH requests 001097

Trunk TCH rejected FR requests 001100

Trunk TCH rejected HR requests 001101

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Table 7. TCH failure counters (cont.)

Counter Counter number  

Rejected TCH requests due lack FR 001118

Rejected TCH requests due lack HR 001119

Full TCH rejected requests due HR traff ic 001120

Half TCH rejected requests due FR traff ic 001121

TCH rejected due requested channel A interface

circuit

001122

Ended due transcoder FR rate 1 001127

Ended due transcoder FR rate 2 001128

Ended due transcoder FR rate 3 001129

Ended due transcoder HR rate 1 001130

Ended due transcoder HR rate 2 001131

Ended due transcoder HR rate 3 001132

Full TCH transaction failures 001133

Half TCH transaction failures 001134

TCH release due to radio failure 001139

TCH release due to BSS failure 001140

TCH seizure failure due to congestion 001141

Queued urgent HO attempts not served 001147

TCH request rejected due to bad quality in adjacents 001151

TCH req rej when qual betw good and bad in adj 001153

HSCSD connection releases due to failure 001164

TCH request for direct access rejected due to lack 001166

Rej TCH seiz for BSC contr TRHO due lack of res 001169

TCH request in DADLB HO rejected 001171

TCH drop due to too low RX level 001194

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Table 7. TCH failure counters (cont.)

Counter Counter number  

TCH releases due to radio failures, updated in phases

9-11

001198

TCH releases due to BSS failures, updated in phases

2-3

001199

TCH releases due to BSS failures, updated in phases

9-11

001200

Dropped calls after TCH assignment 001202

Number of TCH drops between Assignment Complete

and RF Channel Release messages

001204

Number of TCH releases due to radio failures,

updated only in phases 2-3

001205

Number of TCH releases due to radio failures,

updated only in phases 12-14

001206

Number of TCH releases due to BSS failures,

updated only in phases 12-14

001207

Number of TCH requests rejected due to the

mismatch between the types of the requested channel

and the A interface circuit, updated only in call setupphase

001208

Number of TCH releases due to BSC-BSC conflict in

call setup

001211

Number of TCH releases due to BSC-BSC conflict for 

target channel

001212

. Other counters

Table 8. Other counters

Counter Counter number  

  Average queue length for channel seizure request 001018

Queue denominator 1 001019

  Average queue time of call attempts 001020

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Table 8. Other counters (cont.)

Counter Counter number  

Queue denominator 2 001021

  Average queue time of HO attempts 001022

Queue denominator 3 001023

Not relevant 001032

Not relevant 001073

Not relevant 001082

Successful MOC test call 001093

Unsuccessful MOC test call 001094

  Average queuing time of urgent HO attempts 001143

Queue denominator 4 001144

  Average queuing time of non-urgent HO attempts 001145

Queue denominator 5 001146

Successful AMR codec set downgrades 001185

Unsuccessful AMR codec set downgrades 001186

Successful AMR codec set upgrades 001187

Unsuccessful AMR codec set upgrades 001188

. GPRS counters

Table 9. GPRS counters

Counter Counter number  

GPRS territory upgrade requests 001174

Incompletely served GPRS territory upgrade requests 001175

GPRS upgrade requests rejected due to CSW traffic 001176

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Table 9. GPRS counters (cont.)

Counter Counter number  

GPRS upgrade requests rejected due to lack of PSW 001177

GPRS upgrade requests rejected due to to lack of 

PCU

001178

GPRS downgrades due to increase in CSW traffic 001179

GPRS upgrades due to decrease in CSW traffic 001180

GPRS territory downgrade requests 001181

GPRS territory downgrade rejected due to streaming

traffic

001209

GPRS territory downgrade rejected due to need of 

CS resources.

001210

Number of GPRS territory upgrade requestes from

CSW

001213

Number of GPRS territory upgrade requests from

CSW, partially successful

001214

Number of GPRS territory upgrade requests from

CSW, failed

011215

. Spare counters

Table 10. Spare counters

Counter Counter number  

Spare001191 001191

Spare001192 001192

Spare001193 001193

Spare001216 001216

Spare001217 001217

Spare001218 001218

Spare001219 001219

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Table 10. Spare counters (cont.)

Counter Counter number  

Spare001220 001220

Spare001221 001221

Spare001222 001222

Spare001223 001223

Spare001224 001224

Spare001225 001225

Spare001226 001226

Spare001227 001227

Spare001228 001228

Spare001229 001229

Spare001230 001230

Related topics

. Counters of Traffic Measurement 

. Signalling Charts of Traffic Measurement 

.  Activating and Testing BSS7057: Direct Access to Super re-use TRX 

.   Activating and Testing BSS8123: Advanced Multilayer Handling 

.   BSC Statistics Administration

.   BSC Measurement Counters Displaying Program (FOXMEA)

.   Performance Measurements

.  Direct Access to Desired Layer/Band 

.  Directed Retry in BSC 

.   Dynamic Hotspot 

.   Dynamic SDCCH  in Radio Channel Allocation

. (E)GPRS in BSC 

.  Enhanced Coverage by Frequency Hopping 

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.  Enhanced Speech Codecs: AMR and EFR

.  Extended Cell Range

.

  Half Rate in BSC .   Handover Support for Coverage Enhancements

.  HSCSD and 14.4 kbit/s Data Services in BSC 

.   Intelligent Underlay-Overlay

.  Multi BCF Control in BSC 

. Traffic Reason Handover in BSC 

. Trunk Reservation

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2 Counters of Traffic Measurement

Number 

Name

Release

001000

SEIZURE ATTEMPTS

S1

Trigger points See figures:

. Basic call with counters

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. SDCCH congestion, FACCH call setup is not activated 

. Successful SDCCH internal intra-cell handover 

. Successful SDCCH internal inter-cell handover 

. Successful SDCCH external handover target 

. Reconfiguration from TCH to SDCCH 

Description Number of times when an MS attempts to seize an SDCCH.

Updated When the RRM receives requests for SDCCH from an MS as the MS

needs a channel for either a call or a HO.

Number 

Name

Release

001001

SEIZURE ATTEMPTS WITH BUSY SDCCH

S1

Trigger points See figures:

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion

. SDCCH congestion, FACCH call setup is not activated 

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Number 

Name

Release

001001

SEIZURE ATTEMPTS WITH BUSY SDCCH

S1

Description Number of times when an MS attempts to seize an SDCCH but the

attempt is unsuccessful because all SDCCHs are busy. This counter 

does not necessarily mean that the call attempt is lost, because the

call may be established as an FACCH call setup using TCH instead of 

SDCCH. This counter is not triggered when the TCH reconfiguration

is attempted because of dynamic SDCCH allocation. If the attempt

fails, the SDCCH_busy_attempt is triggered together with 1155

UNSUCC_IMM_ASS_SDCCH_ATTEMPT.

Updated When the RRM has no SDCCHs to allocate for a call or HO attempts.

Number 

Name

Release

001002

TRANSACTIONS FAIL DUE TO BSS FAIL

S1

Trigger points See figures:

. Unsuccessful SDCCH activation

. SDCCH assignment failure

. Unsuccessful SDCCH activation

. TRX/TSL is blocked with different causes during an SDCCH 

channel activation

. Unsuccessful SDCCH internal intra-cell handover 

. Unsuccessful SDCCH external handover 

Description Number of SDCCH transactions ended because of a BSS failure.

Updated When one of the counters 001033, 001034, 001035, or 001036 is

updated. This counter represents their sum.

Impact See field descriptions of the counters 001033, 001034, 001035, and

001036.

Number 

Name

Release

001003

TRANSACTIONS FAIL DUE TO RADIO FAIL

S1

Trigger points See figures:

. TCH assignment failure

. Connection failure during SDCCH assignment 

Description Number of SDCCH transactions ended because of a radio failure.

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Number 

Name

Release

001003

TRANSACTIONS FAIL DUE TO RADIO FAIL

S1

Updated When an SDCCH transaction ends because of a radio failure (radio

link timeout) and the RRM releases the SDCCH.

Impact Call cleared

Reason for the impact External / Abis Interface

Number 

Name

Release

001004

TRANSACTIONS FAIL DUE RADIO ON SOURCE

CHANNEL DURING HO

S1

Trigger points See figure Unsuccessful SDCCH internal inter-cell handover 

Description Number of SDCCH transactions ended because of a radio failure on

the source channel during a handover between SDCCH-SDCCH or 

SDCCH-TCH.

Updated When an SDCCH transaction ends because of a radio failure (HO

failure) on the source channel during a handover attempt and the

RRM releases the SDCCH.

Dependencies with other 

counters/PI(s)

It is this counter in the source cell that is updated. If the target cell lies

within the same BSC, also counter 001005 in the target cell is updated

along with this counter.

Impact HO failure and call cleared

Number 

Name

Release

001005

TRANSACTIONS FAIL DUE RADIO ON TARGET CHANNEL

DURING HO

S1

Trigger points See figure Unsuccessful SDCCH internal intra-cell handover 

Description Number of SDCCH transactions ended because of a radio failure on

the target channel during an SDCCH HO.

Updated When an SDCCH transaction ends because of a radio failure on the

target channel during a handover attempt and the RRM releases the

SDCCH.

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Number 

Name

Release

001005

TRANSACTIONS FAIL DUE RADIO ON TARGET CHANNEL

DURING HO

S1

Impact HO failure, the call may possibly be cleared

Reason for the impact Since the MS cannot access the target channel, a radio failure occurs.

The unsuccessful seizure may have been caused by a missing

indication of call establishment, missing detection of HO, missing

indication of the HO completed, or corrupted messages related to the

HO.

Number 

Name

Release

001006

SUCCESS SEIZURE FOR HO

S1

Trigger points See figures:

. Successful SDCCH internal intra-cell handover 

. Successful SDCCH internal inter-cell handover 

. Successful SDCCH external handover target 

Description Number of successful SDCCH seizures for a handover.

Updated When the RRM allocates an SDCCH as a response to an SDCCH

request in a handover attempt.

Number 

Name

Release

001007

SUCCESS SEIZURE FOR IMMEDIATE ASSIGNMENT

S1

Trigger points See figures:

. Basic call with counters

. Reconfiguration from TCH to SDCCH 

Description Number of successful seizures of SDCCH for an immediate

assignment.

Updated When the RRM allocates an SDCCH for an immediate assignment in

a call attempt.

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Number 

Name

Release

001008

SUCCESS TCH SEIZURE FOR HO

S1

Trigger points See figures:

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Successful internal inter-cell handover 

. Successful external handover, target 

Description Number of successful requests for a TCH in a handover.

Updated When the RRM allocates a TCH as a response to a TCH request in a

handover attempt. The channel is reserved by the RRM, but thesuccess of the HO is not known in this phase.

Number 

Name

Release

001009

SUCCESS TCH SEIZURE FOR NORMAL ASSIGNMENT

S1

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Successful TCH queuing 

. Successful forced release

. Successful forced handover 

Description Number of successful requests for a TCH in a normal assignment.

Updated When the RRM allocates a TCH as a response to a TCH request in a

call attempt.

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Number 

Name

Release

001010

TCH REQUEST SUCCESS AND UNSUCCESS

S1

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful external handover, target 

. Successful forced release

.

Unsuccessful forced release. Unsuccessful forced release with external handover 

. Successful forced handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Total number of requests for a TCH (successful and unsuccessful).

Updated When the RRM receives a request for a TCH either in a call or a

handover attempt.

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Number 

Name

Release

Definition updated

001011

TCH REQUEST REJECTED DUE TO LACK

S1

S11

Trigger points See figures:

. Basic call 

. Basic call, no free TCHs

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

.

Unsuccessful forced release. Unsuccessful forced release with external handover 

. Unsuccessful forced handover 

Description Number of requests for TCHs that are rejected because there are no

radio resources available. This counter is also updated when a

request for TCH is rejected because of a mismatch between the types

of the requested channel and the A interface circuit.

Updated When the RRM has no TCHs available for either call or HO attempt

requests, or the RRM changes the A interface circuit pool before the

TCH allocation. This counter may be updated immediately after a

TCH request or, in case of queuing, when the queuing timer expires.

NOTE! In case of DR this counter is updated as follows:

1) When a call is removed from the queue because of a DR attempt,

this counter is NOT updated on the SOURCE side, instead counter 

001173 is updated.

2) If queueing is not used or the queueing timer expires before a DR

attempt, this counter is updated on the SOURCE side.

3) On the TARGET side, this counter is updated in case of congestion

(blocking ).

Dependencies with other 

counters/PI(s)

See also counter 004079.

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Number 

Name

Release

001012

TRANSACTIONS ENDED DUE TO BSS PROBLEM

S1

Trigger points See figures:

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful external handover 

. Unsuccessful external handover, MS sends a handover failure

Description Number of TCH transactions ended because of BSS problems.

Updated When one of the counters 001045, 001046, 001047, or 001051 is

updated. This counter represents their sum.

Impact See field descriptions of counters 001045, 001046, 001047 and

001051.

Number 

Name

Release

Definition updated

001013

TRANSACTIONS ENDED DUE RADIO FAIL

S1

S11

Trigger points See figure Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of TCH transactions ended because of a radio failure.

Updated When a TCH transaction ends because of a radio failure and the RRM

releases the TCH. This counter is typical in connection with coverage

problems.

ERROR INDICATION is sent by the BTS to the BSC in the followingcases:

. Sequence error in a received message (the case where

retransmission is not possible).

. Timer T200 has expired N200 +1 times (MS doesn't respond any

more).

. Unsolicited DM response when link is established.

Impact Call cleared

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Number 

Name

Release

001014

TRANSACTIONS ENDED DUE SOURCE CHANNEL FAIL

DURING HO

S1

Trigger points See figure Unsuccessful internal intra-cell handover, timer expires on

the source channel, call cleared 

Description Number of TCH transactions ended because of a radio failure on the

source channel during a handover attempt.

Updated When a TCH transaction ends because of a radio failure (HO failure)

on the source channel during a handover attempt.

Impact HO failure and call cleared

Number 

Name

Release

001015

TRANSACTIONS ENDED DUE TARGET CHANNEL FAIL

DURING HO

S1

Description A TCH transaction ends because of a radio failure (HO failure) on the

target channel during a handover attempt.

Updated When a TCH transaction ends because of a radio failure on the target

channel during a handover attempt.

Impact HO failure, the call may possibly be cleared

Reason for the impact Since the MS cannot access the target channel, a radio failure occurs.

It may be caused by missing indication of call establishment, missing

detection of HO, missing indication of the HO completed or corrupted

messages related to HO.

Dependencies with other 

counters/PI(s)

Counter 1088 is also updated along with this counter if the MS fails to

return to the old channel during an inter  BSC handover.

Number 

Name

Release

001016

CALL ATTEMPTS IN THE QUEUE

S1

Trigger points See figures:

. Successful TCH queuing 

. Basic call, no free TCHs

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Number 

Name

Release

001016

CALL ATTEMPTS IN THE QUEUE

S1

Description Number of call attempts set in the queue for a TCH.

Updated When the RRM puts a TCH request for call attempt in the queue since

it has no TCHs of the requested kind available.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Number 

Name

Release

001017

HANDOVER ATTEMPTS IN THE QUEUE

S1

Trigger points See figures:

. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

Description Number of HO attempts set in the queue for a TCH.

Updated When the RRM sets a TCH request for a handover attempt in the

queue since it has no TCHs of the requested kind available.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Number 

Name

Release

001018

AVE QUEUE LENGTH FOR CHANNEL SEIZURE REQUEST

S1

Trigger points See figure Average counter updating 

Description Average number of requests for channel seizure in the queue.

Updated Every 20 seconds, as averaging takes place once in the

measurement period. The sample counter is updated when a request

is set in the queue or removed from it. Updated only to normal TRX

record, not to extended TRX record.

Logical type Average

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Number 

Name

Release

001019

QUEUE DENOMINATOR 1

S1

Description Denominator of the average number of requests for channel seizure

(always > 0).

Number 

Name

Release

001020

AVE QUEUE TIME OF CALL ATTEMPTS

S1

Trigger points See figures:

. Successful TCH queuing 

. Basic call, no free TCHs

Description The average time for which call attempts are kept in the queue (the

unit of the value is 10 ms).

Updated The sample counter is updated when a TCH request for a call attempt

is removed from the queue (both in a successful and unsuccessful

case).

Dependencies with other 

counters/PI(s)

In a successful case counters 001009 and 001021 are updated along

with this counter. In an unsuccessful case counters 001021, 001024

and 001060 are updated along with this counter.

Logical type Average

Unit 10 ms

Number 

Name

Release

001021

QUEUE DENOMINATOR 2

S1

Trigger points See figures:

. Successful TCH queuing 

. Basic call, no free TCHs

Description Denominator of the average t ime for which call attempts are kept in

the queue (always > 0).

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Number 

Name

Release

001022

AVE QUEUE TIME OF HO ATTEMPTS

S1

Trigger points See figures:

. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

Description The average time for which HO attempts are kept in the queue. (the

unit of the value is 10 ms)

Updated The sample counter is updated when a TCH request for a handover  

attempt is removed from the queue (both in a successful andunsuccessful case).

Dependencies with other 

counters/PI(s)

In a successful case counters 001008 and 001023 are updated along

with this counter. In an unsuccessful case counters 001023, 001025

and 001068 are updated along with this counter.

Logical type Average

Unit 10 ms

Number Name

Release

001023QUEUE DENOMINATOR 3

S1

Trigger points See figures:

. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

Description Denominator of the average time for which HO attempts are kept in

the queue (always > 0).

Number 

Name

Release

001024

NOT SERVED QUEUED CALL ATTEMPTS

S1

Trigger points See figure Basic call, no free TCHs

Description Number of call attempts in the queue which were not served.

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Number 

Name

Release

001024

NOT SERVED QUEUED CALL ATTEMPTS

S1

Updated When a call attempt is removed from the queue because a timer  

expires, or the call attempt is substituted by another attempt of higher 

priority.

NOTE! This counter is not updated in DR (neither in a successful or 

unsuccessful DR).

Dependencies with other 

counters/PI(s)

Counters 001020, 001021 and 001060 are updated along with this

counter.

Number Name

Release

001025NOT SERVED QUEUED HO ATTEMPTS

S1

Trigger points See figure Internal intra-cell handover, unsuccessful TCH queuing 

Description Number of HO attempts in the queue which were not served.

Updated When a handover attempt is removed from the queue because a timer  

expires, or the HO attempt is substituted by another attempt of higher 

priority.

Dependencies with other counters/PI(s)

Counters 001022, 001023 and 001068 are updated along with thiscounter.

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Number 

Name

Release

001026

TCH CALL REQ

S2

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Basic call 

. Successful TCH queuing 

. Basic call, no free TCHs

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

.

Internal directed retry . Successful forced release

. Unsuccessful forced release

. Successful forced handover 

. Unsuccessful forced handover 

Description Number of TCH requests for a normal assignment (both successful

and unsuccessful).

Updated When the RRM receives a TCH request in a call attempt.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Number 

Name

Release

001027

SDCCH ACT FAIL

S2

Trigger points See figures:

. Unsuccessful SDCCH activation

. Unsuccessful SDCCH internal intra-cell handover, unsuccessful 

channel activation

Description Number of SDCCH transactions that are ended because of a failure in

the activation of a channel either during a call or HO attempt.

Updated When either of the counters 001072 and 001074 is updated. This

counter represents their sum.

Impact - Call cleared

- HO failure

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Number 

Name

Release

001027

SDCCH ACT FAIL

S2

Reason for the impact External / Abis interface

Number 

Name

Release

001028

TCH ACT FAIL

S2

Trigger points See figures:

. Unsuccessful TCH activation

.

Unsuccessful internal inter-cell handover 

Description Number of TCH transactions that are ended because of a failure in the

activation of a channel either during a call or HO attempt.

Updated When either of the counters 001081 and 001083 is updated. This

counter represents their sum.

Impact - Call cleared

- HO failure

Reason for the impact Abis Interface

Number 

Name

Release

001029

TCH TR FAIL

S2

Trigger points See figure CONNECTION_FAILURE message with cause

transcoder_failure during a call 

Description Number of TCH transactions that are ended because of a transcoder 

failure.

Updated When a TCH transaction ends because of a transcoder failure during

a call attempt and the RRM releases the TCH. These failures can also

contains situations when the timer T3109 expires in a BSC in call

release phase while waiting for the Release Indication. The MS

subscriber does not see these failures caused by the T3109 expiry as

real drop calls.

Impact Call cleared

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Number 

Name

Release

001030

TCH TR FAIL SOURCE

S2

Description Number of TCH transactions that are ended because of a transcoder 

failure on the source channel during a handover on a TCH.

Updated When a TCH transaction ends because of a transcoder failure on the

source channel during a handover attempt and the RRM releases the

TCH. This happens before the RRM receives a message from the MS

stating that the HO or assignment is completed.

Impact HO failure and call cleared

Number 

Name

Release

001031

TCH TR FAIL TARGET

S2

Trigger points See figure Unsuccessful internal intra-cell handover 

Description Number of TCH transactions that are ended because of a transcoder 

failure on the target channel during a handover on a TCH.

Updated When a TCH transaction ends because of a transcoder failure on the

target channel during a handover attempt and the RRM releases theTCH. This happens before the RRM receives a message from the MS

stating that the HO or assignment is completed.

Impact HO failure, the call may possibly be cleared

Number 

Name

Release

001032

NOT RELEVANT

S2

Description Not in use

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Number 

Name

Release

001033

SDCCH ABIS PROBL

S2

Trigger points See figures:

. Unsuccessful SDCCH activation

. Unsuccessful SDCCH activation

. TRX/TSL is blocked with different causes during an SDCCH 

channel activation

. Unsuccessful SDCCH internal intra-cell handover 

Description Number of SDCCH transactions that are ended because of a failure in

the Abis interface.

Updated When any of the counters 001075, 001076 and 001077 is updated.

This counter represents their sum.

Impact - Call cleared

- HO failure

Reason for the impact External / Abis interface

Number 

Name

Release

001034

SDCCH A IF PROBL

S2

Trigger points See figures:

. SDCCH assignment failure

. Unsuccessful SDCCH external handover 

Description Number of SDCCH transactions that are ended because of a failure in

the A interface.

Updated When any of the counters 001078, 001079, and 001080 is updated.

This counter represents their sum.

Impact - Call cleared

- HO failure

Reason for the impact External / A interface

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Number 

Name

Release

001035

SDCCH LAPD FAIL

S2

Trigger points See figure TRX/TSL is blocked with different causes during an

SDCCH channel activation

Description Number of SDCCH transactions that are ended because of an LAPD

failure. (The TRX blocked is in one of these substates: signalling link

fault or PCM fault.)

Updated When an SDCCH transaction ends because of a TRX blocked by an

LAPD failure and the RRM releases the SDCCH.

Impact - Call cleared

- HO failure

Reason for the impact External / Abis interface

Number 

Name

Release

001036

SDCCH BTS FAIL

S2

Trigger points See figure TRX/TSL is blocked with different causes during anSDCCH channel activation

Description Number of SDCCH transactions that are ended because of a BTS

failure. (The blocked TRX is in one of these substates: FU fault, CU

fault, BTS reset, BCF reset, both CU and FU fault, BCF fault.)

Updated When an SDCCH transaction ends because of a TRX being blocked

by a BTS failure and the RRM releases the SDCCH.

Impact Call cleared

Number 

Name

Release

001037

SDCCH USER ACT

S2

Trigger points See figure TRX/TSL is blocked with different causes during an

SDCCH channel activation

Description Number of SDCCH transactions that are ended because of user  

actions. (The TRX/TSL is in substate blocked by the user.)

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Number 

Name

Release

001037

SDCCH USER ACT

S2

Updated When the user disconnects a busy SDCCH by blocking the TSL/TRX

with an MML command. The transaction ends and the SDCCH is

released.

Impact - Call cleared

- HO failure

Number 

Name

Release

001038

SDCCH BCSU RESET

S2

Description Number of SDCCH transactions that are ended because of a BCSU

restart.

Updated When an SDCCH transaction ends because of a TRX blocked by a

BCSU restart and the RRM releases the SDCCH.

Impact - Call cleared

- HO failure

Reason for the impact BCSU restart

Number 

Name

Release

001039

SDCCH NETW ACT

S2

Trigger points See figure TRX/TSL is blocked with different causes during an

SDCCH channel activation

Description Number of SDCCH transactions ended because of a reconfiguration

of the radio network. (The TRX blocked is in substate blocked by the

system.)

Updated When an SDCCH transaction ends because of a TRX blocked by a

failure which leads to TRX reconfiguration. The failure may occur both

during call and HO attempts.

Impact - Call cleared

- HO failure

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Number 

Name

Release

001039

SDCCH NETW ACT

S2

Reason for the impact See Radio Network Management, Service Block Description, for radio

network reconfiguration.

Number 

Name

Release

001040

TRUNK RES INVOC

S2

Trigger points See figures:

.

Successful trunk reservation. Unsuccessful trunk reservation

Description Total number of Trunk Reservation function invocations.

Updated When Trunk Reservation is applied during call setup or handover in

Radio Resource Management.

Feature Trunk Reservation

Number 

Name

Release

001041

SUCC TRUNK RES INVOC

S2

Trigger points See figure Successful trunk reservation

Description Number of successful Trunk Reservation function invocations.

Updated When Trunk Reservation allows resources to be allocated in call

setup or handover in Radio Resource Management.

Feature Trunk Reservation

Number 

Name

Release

001042

TRUNK RES INVOC RES REFUSED

S2

Trigger points See figure Unsuccessful trunk reservation .

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Number 

Name

Release

001042

TRUNK RES INVOC RES REFUSED

S2

Description Number of Trunk Reservation function invocations that result in

resource allocation being refused.

Updated When Trunk Reservation denies access and does not allow resources

to be allocated in call setup or handover in Radio Resource

Management.

Feature Trunk Reservation

Number 

Name

Release

Definition updated

001043

TCH REQ FACCH CALL SET

S2

S5

Trigger points See figures:

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion

Description Number of TCH requests for FACCH call setup during SDCCH

congestion (both successful and unsuccessful).

Updated When the RRM receives a request for an SDCCH but there are no

SDCCHs idle and a TCH is tried to be allocated as part of the FACCH

call setup. It is indicated in the received SDCCH request whether a

FACCH setup is allowed or not.

Dependencies with other 

counters/PI(s)

Counters 001010 and 001098 are updated along with this counter.

Feature BSS5290 FACCH Call Setup because of SDCCH Congestion

Number 

Name

Release

Definition updated

001044

TCH SEIZ FACCH CALL SET

S2

S5

Trigger points See figure FACCH call setup because of SDCCH congestion with

counters

Description Number of successful seizures of TCHs in FACCH call setup.

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Number 

Name

Release

Definition updated

001044

TCH SEIZ FACCH CALL SET

S2

S5

Updated When the RRM allocates a TCH as a response to an SDCCH request

as part of the FACCH call setup because of no SDCCHs being idle.

Dependencies with other 

counters/PI(s)

Counter 001099 is updated along with this counter.

Feature BSS5290 FACCH Call Setup because of SDCCH Congestion

Number 

Name

Release

001045

TCH ABIS PROBL

S2

Trigger points See figures:

. Unsuccessful TCH activation

. TCH assignment failure

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

Description Number of TCH transactions that are ended because of a failure in the

  Abis interface.

Updated When any of the counters 001084, 001085, and 001086 is updated.

This counter represents their sum.

Impact - The call may possibly be cleared

- HO failure

Reason for the impact External / Abis Interface

Number 

Name

Release

001046

TCH LAPD FAIL

S2

Trigger points See figure TRX or TSL is blocked with different causes during a call 

Description Number of TCH transactions that are ended because of an LAPD

failure. (The TRX blocked is in one of these substates: signalling link

fault or PCM fault.)

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Number 

Name

Release

001046

TCH LAPD FAIL

S2

Updated When a TCH transaction ends because of a TRX blocked by an LAPD

failure and the RRM releases the TCH.

Impact - Call cleared

- HO failure

Number 

Name

Release

001047

TCH BTS FAIL

S2

Trigger points See figure TRX or TSL is blocked with different causes during a call 

Description Number of TCH transactions that are ended because of a BTS failure.

(The TRX blocked is in one of these substates: FU fault, CU fault, BTS

reset, BCF reset, both CU and FU fault, BCF fault.)

Updated When a TCH transaction ends because of a TRX blocked by a BTS

failure and the RRM releases the TCH.

Impact Call cleared

Number 

Name

Release

001048

TCH USER ACT

S2

Trigger points See figure TRX or TSL is blocked with different causes during a call 

Description Number of TCH transactions that are ended because of user actions.

(The TRX/TSL is in substate blocked by the user.)

Updated When the user disconnects a busy TCH by blocking the TSL/TRX with

an MML command. The transaction ends and the TCH is released.

Impact - Call cleared

- HO failure

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Number 

Name

Release

001049

TCH BCSU RESET

S2

Description Number of TCH transactions that are ended because of a BCSU

restart.

Updated When a TCH transaction ends because of a TRX blocked by a BCSU

restart and the RRM releases the TCH.

Impact - Call cleared

- HO failure

Reason for the impact BCSU restart

Number 

Name

Release

001050

TCH NETW ACT

S2

Trigger points See figure TRX or TSL is blocked with different causes during a call 

Description Number of TCH transactions ended because of a reconfiguration of  

the radio network. (The TRX blocked is in substate blocked by the

system.)

Updated When a TCH transaction ends because of a TRX blocked by a failure

which leads to TRX reconfiguration.

Reason for the impact See Radio Network Management for radio network reconfiguration.

Number 

Name

Release

001051

TCH A IF PROBL

S2

Trigger points See figures:

. TCH assignment failure

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

Description Number of TCH transactions that are ended because of a failure in the

  A interface.

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Number 

Name

Release

001051

TCH A IF PROBL

S2

Updated When any of the counters 001087, 001088 and 001089 is updated.

This counter represents their sum.

Impact - Call is possibly cleared

- HO failure

Reason for the impact External / A interface

Number 

Name

Release

001052

TRHO REQ

S2

Trigger points See figure Successful traffic reason handover, source

Description Number of HOs because of traffic reasons.

Updated When a handover, under the control of the MSC and because of a

traffic reason procedure, is started as a response to the

TRAFFIC_REASON_HO_CANDIDATE_ENQUIRY message from

the A interface. The counter tells the number of mobiles, determined

by the MSC to be handed over. Updated only to normal TRX record,

not to extended TRX record.

Feature Traffic Reason Handover  

Number 

Name

Release

001053

TRHO ENQUIRIES

S2

Trigger points See figure Successful traffic reason handover, source

Description Number of enquiries about traffic reason HO.

Updated When the RRM starts a handover by sending a message enquiring

about the traffic reason to the Abis interface.

Feature Traffic Reason Handover  

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Number 

Name

Release

001054

FOR REL ASSIGN REQ ATT

S3

Trigger points See figures:

. Basic call with priority subscriber 

. Successful forced release

. Unsuccessful forced release

Description Number of call attempt requests capable of doing a forced release for  

a call in progress.

Updated When the RRM receives a TCH request for a call attempt which is

capable of doing a forced release for a call in progress.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

Number 

Name

Release

001055

FOR HO ASSIGN REQ ATT

S3

Trigger points See figures:

. Basic call with priority subscriber 

. Successful forced handover 

. Unsuccessful forced handover 

Description Number of call attempt requests capable of doing a forced HO for a

call in progress.

Updated When the RRM receives a TCH request for a call attempt which is

capable of doing a forced HO for a call in progress.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

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Number 

Name

Release

001056

QUE ALL ASSIGN REQ ATT

S3

Trigger points See figures:

. Basic call with counters

. Successful TCH queuing 

. Basic call, no free TCHs

. Unsuccessful trunk reservation

Description Number of requests for a call attempt with queuing allowed.

Updated When the RRM receives a TCH request for a call attempt which is

allowed to queue for channels.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

Number 

Name

Release

001057

QUE NALL ASSIGN REQ ATT

S3

Trigger points See figures:

. Basic call with counters

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

Description Number of requests for a call attempt with queuing not allowed.

Updated When the RRM receives a TCH request for a call attempt which is not

allowed to queue for channels.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

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Number 

Name

Release

001058

FOR REL ASSIGN REQ FAIL

S3

Trigger points See figure Unsuccessful forced release

Description Number of rejected call attempt requests capable of doing a forced

release for a call in progress.

Updated When the RRM rejects a TCH request for a call attempt which is

capable of doing a forced release for a call in progress. The high

priority TCH request is rejected because of lack of a suitable call for 

release or because pre-emption software is not in use in the BSC.

Dependencies with other counters/PI(s)

Counters 001011 and 001141 are updated along with this counter.

Feature Queuing and Priority

Reason for the impact There is no suitable call for release in the cell or the pre-emption

software is not in use in the BSC.

Number 

Name

Release

001059

FOR HO ASSIGN REQ FAIL

S3

Trigger points See figure Unsuccessful forced handover 

Description Number of rejected call attempt requests capable of doing a forced

HO for a call in progress.

Updated When the RRM rejects a TCH request for a call attempt which is

capable of doing a forced handover for a call in progress. The high

priority TCH request is rejected because of a lack of suitable calls for 

a forced handover or because the pre-emption software is not in use

in the BSC.

Dependencies with other counters/PI(s)

Counters 001011 and 001141 are updated along with this counter.

Feature Queuing and Priority

Reason for the impact There is no suitable call for a forced handover in the cell or the pre-

emption software is not in use in the BSC.

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Number 

Name

Release

001060

QUE ALL ASSIGN REQ FAIL

S3

Trigger points See figures:

. Basic call, no free TCHs

. Unsuccessful trunk reservation

Description Number of rejected call attempt requests with queuing allowed.

Updated When the RRM rejects a TCH request for a call attempt which is

allowed to queue.

Dependencies with other 

counters/PI(s)

Counters 001011 and 001141 are updated along with this counter.

Feature Queuing and Priority

Reason for the impact This may be because of queuing is not allowed in the BTS, or the

request is removed from the queue because of expiry of a timer, or the

request is replaced by a request with higher priority.

Number 

Name

Release

001061

QUE NALL ASSIGN REQ FAIL

S3

Trigger points See figures:

. Basic call 

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

Description Number of rejected call attempt requests with queuing not allowed.

Updated When the RRM rejects a TCH request for a call attempt which is not

allowed to queue.

Dependencies with other 

counters/PI(s)

Counters 001011 and 001141 are updated along with this counter.

Feature Queuing and Priority

Reason for the impact There are no radio resources available.

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Number 

Name

Release

001062

FOR REL HO REQ ATT

S3

Trigger points See figure Unsuccessful forced release with external handover 

Description Number of requests for a handover capable of doing a forced release

for a call in progress.

Updated When the RRM receives a TCH request for a handover attempt which

is capable of doing a forced release for a call in progress.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

Number 

Name

Release

001063

FOR HO HO REQ ATT

S3

Trigger points See figure Unsuccessful forced handover with external handover 

Description Number of requests for a handover capable of doing a forced HO for a

call in progress.

Updated When the RRM receives a TCH request for a handover attempt which

is capable of doing a forced HO for a call in progress.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

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Number 

Name

Release

001064

QUE ALL HO REQ ATT

S3

Trigger points See figures:

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful external handover, target.

Description Number of requests for a handover with queuing allowed.

Updated When the RRM receives a TCH request for a handover attempt which

is allowed to queue for radio resources.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

Number 

Name

Release

001065

QUE NALL HO REQ ATT

S3

Trigger points See figures:

. Successful internal intra-cell handover 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Successful internal inter-cell handover 

. Successful external handover, target 

Description Number of requests for HO with queuing not allowed.

Updated When the RRM receives a TCH request for a handover attempt which

is not allowed to queue for radio resources.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature Queuing and Priority

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Number 

Name

Release

001066

FOR REL HO REQ FAIL

S3

Trigger points See figure Unsuccessful forced release with external handover 

Description Number of rejected requests for a handvover capable of doing a

forced release for a call in progress.

Updated When the RRM rejects a TCH request for a handover attempt which is

capable of doing a forced release for a call in progress. The high

priority TCH request is rejected because of a lack of suitable calls for 

release or because the pre-emption software is not in use in the BSC.

Dependencies with other counters/PI(s)

Counter 001011 is updated along with this counter.

Feature Queuing and Priority

Reason for the impact There is no suitable call for release in the cell or the pre-emption

software is not in use in BSC.

Number 

Name

Release

001067

FOR HO HO REQ FAIL

S3

Trigger points See figure Unsuccessful forced handover with external handover 

Description Number of rejected requests for a handover capable of doing a forced

HO for a call in progress.

Updated When the RRM rejects a TCH request for a handover attempt which is

capable of doing a forced handover for a call in progress. The high

priority TCH request is rejected because of a lack of suitable calls for 

a forced handover or because the pre-emption software is not in use

in the BSC.

Dependencies with other counters/PI(s)

Counter 001011 is updated along with this counter.

Feature Queuing and Priority

Reason for the impact There is no suitable call for a forced handover in the cell or the pre-

emption software is not in use in the BSC.

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Number 

Name

Release

001068

QUE ALL HO REQ FAIL

S3

Trigger points See figure Internal intra-cell handover, unsuccessful TCH queuing 

Description Number of the rejected requests for a handover with queuing allowed.

Updated When the RRM rejects a TCH request for a handover attempt which is

allowed to queue.

Dependencies with other 

counters/PI(s)

Counter 001011 is updated along with this counter.

Feature Queuing and Priority

Reason for the impact This may be because queuing is not allowed in the BTS, or the

request is removed from the queue because of expiry of a timer, or the

request is replaced by another with higher priority.

Number 

Name

Release

001069

QUE NALL HO REQ FAIL

S3

Trigger points See figure Unsuccessful underlay overlay internal intra-cell handover,queuing not allowed 

Description Number of rejected requests for a handover with queuing not allowed.

Updated When the RRM rejects a TCH request for a handover attempt which is

not allowed to queue.

Dependencies with other 

counters/PI(s)

Counter 001011 is updated along with this counter.

Feature Queuing and Priority

Reason for the impact There are no radio resources available.

Number 

Name

Release

001070

FORCED RELEASES

S3

Trigger points See figure Successful forced release

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Number 

Name

Release

001070

FORCED RELEASES

S3

Description Number of forced releases.

Updated When the RRM starts to terminate a call in progress forcefully by

sending a release request to the Abis interface.

Feature Queuing and Priority

Number 

Name

Release

001071

FORCED HANDOVERS

S3

Trigger points See figure Successful forced handover 

Description Number of forced HOs.

Updated When the RRM receives an acknowledgement from the Handover  

 Attempt Supervisor of the Abis interface to its request for a forced HO.

Feature Queuing and Priority

Number 

Name

Release

001072

SDCCH ACT FAIL CALL

S3

Trigger points See figure Unsuccessful SDCCH activation

Description Number of SDCCH transactions that are ended because of a failure in

the activation of a channel during a call.

Updated When an SDCCH transaction ends because of a failure to activate a

channel in the BTS and the RRM releases the SDCCH.

Impact Call cleared

Reason for the impact Abis Interface

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Number 

Name

Release

001073

NOT RELEVANT

S3

Description Not in use

Number 

Name

Release

001074

SDCCH ACT FAIL TARGET

S3

Trigger points See figure Unsuccessful SDCCH internal intra-cell handover,

unsuccessful channel activation

Description Number of SDCCH transactions that are ended because of a failure to

activate the target channel during an SDCCH HO.

Updated When an SDCCH transaction ends because of a failure to activate the

target channel during a handover attempt and the RRM releases the

SDCCH.

Feature SDCCH Handover  

Impact HO failure and possibly call cleared

Reason for the impact External / Abis Interface

Number 

Name

Release

001075

SDCCH ABIS FAIL CALL

S3

Trigger points See figures:

. Unsuccessful SDCCH activation

. Unsuccessful SDCCH activation

.

TRX/TSL is blocked with different causes during an SDCCH channel activation

Description Number of SDCCH transactions that are ended because of a failure in

the Abis interface during a call in progress. There is no

acknowledgement of channel activation, no indication of call

establishment received, i.e., ghosts.

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Number 

Name

Release

001075

SDCCH ABIS FAIL CALL

S3

Updated When an SDCCH transaction ends because of signalling problems in

the Abis interface and the RRM releases the SDCCH.

Reasons that trigger the counter:

Phantom RACHs that have a valid establihment cause.

The BTS can hear the MS, but the MS cannot hear the BTS, and so

the MS does not respond to the IMMEDIATE ASSIGNMENT

message with a SABM.

MS is accessing the network at the limit of sensitivity and messages

are lost.

Poor Radio conditions.

MS is accessing network through another BTS (co-channel, co-BSIC

interference).

Impact Call cleared

Reason for the impact External / Abis interface

Number 

Name

Release

001076

SDCCH ABIS FAIL SOURCE

S3

Description Number of SDCCH transactions that are ended because of a failure in

the Abis interface on the source channel during SDCCH-SDCCH or 

SDCCH-TCH HO.

Updated When an SDCCH transaction ends because of a failure in the Abis

interface on the source channel during a handover and the RRM

releases the SDCCH.

Feature SDCCH Handover, Directed retry

Impact HO failure and call cleared

Reason for the impact External / Abis interface.

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Number 

Name

Release

001077

SDCCH ABIS FAIL TARGET

S3

Trigger points See figure Unsuccessful SDCCH internal intra-cell handover 

Description Number of SDCCH transactions that are ended because of a failure in

the Abis interface on the target channel during a handover.

Updated When an SDCCH transaction ends because of a failure in the Abis

interface on the target channel during a handover and the RRM

releases the SDCCH.

Feature SDCCH Handover  

Impact HO failure and possibly call cleared

Reason for the impact External / Abis interface

Number 

Name

Release

001078

SDCCH A IF FAIL CALL

S3

Trigger points See figure SDCCH assignment failure

Description Number of SDCCH transactions ended because of a failure in the A

interface during a call attempt.

Updated When an SDCCH transaction ends because of signalling problems in

the A interface during a call attempt and the RRM releases the

SDCCH.

Impact Call cleared

Reason for the impact External / A interface.

There may be a failure in the SDCCH signalling connection.

Number 

Name

Release

001079

SDCCH A IF FAIL SOURCE

S3

Trigger points See figure Unsuccessful SDCCH external handover 

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Number 

Name

Release

001079

SDCCH A IF FAIL SOURCE

S3

Description Number of SDCCH transactions ended because of a failure in the A

interface on the source channel during an SDCCH-SDCCH or 

SDCCH-TCH HO.

Updated When an SDCCH transaction ends because of signalling problems in

the A interface during an SDCCH-SDCCH or SDCCH-TCH HO and

the RRM releases the SDCCH.

Feature SDCCH Handover, Directed retry

Impact HO failure and call cleared

Reason for the impact External / A interface.

There may be a failure in the SDCCH signalling connection.

Number 

Name

Release

001080

SDCCH A IF FAIL TARGET

S3

Trigger points See figure Unsuccessful SDCCH external handover 

Description Number of SDCCH transactions ended because of a failure in the Ainterface on the target channel during an SDCCH HO.

Updated When an SDCCH transaction ends because of signalling problems in

the A interface during an SDCCH HO and the RRM releases the

SDCCH.

Feature SDCCH Handover  

Impact HO failure and call cleared

Reason for the impact External / A interface.

There may be a failure in the SDCCH signalling connection.

Number 

Name

Release

001081

TCH ACT FAIL CALL

S3

Trigger points See figure Unsuccessful TCH activation

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Number 

Name

Release

001081

TCH ACT FAIL CALL

S3

Description Number of TCH transactions that are ended because of a failure to

activate a channel during a call attempt.

Updated When a TCH transaction ends because of a failure to activate a

channel in the BTS and the RRM releases the TCH.

Impact Call cleared

Number 

Name

Release

001082

NOT RELEVANT

S3

Description Not in use

Number 

Name

Release

001083

TCH ACT FAIL TARGET

S3

Trigger points See figure Unsuccessful internal inter-cell handover 

Description Number of TCH transactions that are ended because of a failure to

activate the target channel during an SDCCH-TCH or TCH-TCH HO.

Updated When a TCH transaction ends because of a failure to activate the

target channel during a TCH HO attempt and the RRM releases the

TCH.

Impact HO failure and possibly call cleared

Reason for the impact The RRM receives the CHANNEL_ACTIVATION_NACK message.

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Number 

Name

Release

001084

TCH ABIS FAIL CALL

S3

Trigger points See figures:

. Unsuccessful TCH activation

. TCH assignment failure

. TRX or TSL is blocked with different causes during a call 

Description Number of TCH transactions ended because of a failure in the Abis

interface during a call in progress.

Updated When a TCH transaction ends because of signalling problems in the

 Abis interface and the RRM releases the TCH.

Impact Call cleared

Reason for the impact External / Abis Interface

The signalling problems may include missing acknowledgement of 

channel activation, missing indication of call establishment, receipt of 

an error indication, corrupted messages, missing measurement

results from the BTS, excessive timing advance or some internal

reasons. These failures can also contain situations when the timer 

T3109 expires in a BSC in call release phase while waiting for the

Release Indication. The MS subscriber does not see these failures

caused by the T3109 expiry as real drop calls.

Number 

Name

Release

001085

TCH ABIS FAIL SOURCE

S3

Description Number of TCH transactions ended because of a failure in the Abis

interface on the source channel during a TCH HO.

Updated When a TCH transaction ends because of a failure in the Abis

interface on the source channel during a TCH HO and the RRM

releases the TCH.

Impact HO failure and call cleared

Reason for the impact External / Abis Interface

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Number 

Name

Release

001086

TCH ABIS FAIL TARGET

S3

Trigger points See figure Unsuccessful internal intra-cell handover 

Description Number of TCH transactions ended because of a failure in the Abis

interface on the target channel during a TCH HO.

Updated When a TCH transaction ends because of a failure in the Abis

interface on the target channel during a TCH HO and the RRM

releases the TCH.

Impact HO failure and possibly call cleared

Reason for the impact External / Abis Interface

Number 

Name

Release

001087

TCH A IF FAIL CALL

S3

Trigger points See figure TCH assignment failure

Description Number of TCH transactions ended because of a failure in the A

interface during a call in progress.

Updated When a TCH transaction ends because of signalling problems in the A

interface during a call and the RRM releases the TCH.

Impact Call cleared

Reason for the impact External / A interface.

The signalling problems may include the CLEAR_COMMAND

message from the MSC during the call setup phase before the MSC

receives an indication of the completion of the assignment from the

MS and the ABNORMAL_CLEAR_ RECEIVED_DUE_TO_A_ 

INTERFACE message (reset circuit, SCCP cleared by RLSD).

Number 

Name

Release

001088

TCH A IF FAIL SOURCE

S3

Trigger points See figure Unsuccessful external handover, source BSC 

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Number 

Name

Release

001088

TCH A IF FAIL SOURCE

S3

Description Number of TCH transactions ended because of a failure in the A

interface on the source channel during a handover attempt.

Updated When a TCH transaction ends because of an A interface failure (HO

failure) on the source channel during a TCH HO attempt and the RRM

releases the TCH.

Dependencies with other 

counters/PI(s)

This counter is updated in the source cell. If the target cell lies within

the same BSC, also counter 001015 in the target cell is updated along

with this counter.

This counter is also updated if the MS fails to return to the old channel

during an inter  

BSC handover.

Impact HO failure and call cleared

Reason for the impact External / A interface

Number 

Name

Release

001089

TCH A IF FAIL TARGET

S3

Trigger points See figure Unsuccessful external handover, MS sends a handover failure

Description Number of TCH transactions ended because of a failure in the A

interface on the target channel during a handover attempt.

Updated When a TCH transaction ends because of a failure in the A interface

(HO failure) on the target channel during a handover attempt and the

RRM releases the TCH .

Impact HO failure, the call may possibly be cleared

Reason for the impact External / A interface

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Number 

Name

Release

001090

TCH REQ UND OVER

S4

Trigger points See figures:

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal directed retry 

. Successful internal inter-cell handover 

Description Number of TCH requests for an underlay overlay HO. Updated only to

normal TRX record, not to extended TRX record.

Updated When the RRM receives a TCH request for an underlay overlay HO.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSC4016 Intelligent Underlay Overlay

Number 

NameRelease

001091

TCH SEIZ UND OVERS4

Trigger points See figures:

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Successful internal inter-cell handover 

Description Number of TCH seizures for an underlay overlay HO.

Updated When the RRM allocates a TCH as a response to a TCH request for  

an underlay overlay HO. Updated only to normal TRX record, not to

extended TRX record.

Dependencies with other 

counters/PI(s)

Counter 001008 is updated along with this counter.

Feature BSC4016 Intelligent Underlay Overlay

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Number 

Name

Release

001092

TCH REJ REQ UND OVE

S4

Trigger points See figure Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

Description Number of TCH requests for an underlay overlay HO rejected

because of a lack of resources.

Updated When the RRM rejects a TCH request for an underlay overlay HO

because of lack of resources. Updated only to normal TRX record, not

to extended TRX record.

Dependencies with other counters/PI(s)

Counter 001011 is updated along with this counter.

Feature BSC4016 Intelligent Underlay Overlay

Number 

Name

Release

001093

SUCC MOC TEST CALL

S4

Description Number of successful MOC test calls during a scheduled test.

Updated When the RRM receives a message from the BTTEST.

Feature BSC4531 BTS Testing:Scheduled MOC

Number 

Name

Release

001094

FAIL MOC TEST CALL

S4

Description Number of unsuccessful MOC test calls during a scheduled test.

Updated When the RRM receives a message from the BTTEST.

Dependencies with other 

counters/PI(s)

BSC4531 BTS Testing: Scheduled MOC

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Number 

Name

Release

001095

PRI SUBSCR TCH REQ

S5

Trigger points See figures:

. Basic call with priority subscriber 

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of TCH requests of the type priority subscriber  

Updated When the RRM receives a TCH request either in a call or HO attemptand the MS priority level in the priority information element (PIE)

indicates that the MS is a priority subscriber.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS5190 Enhanced Trunk Reservation

Number 

NameRelease

001096

PRI SUBSCR SUCC TCH SEIZS5

Trigger points See figure Basic call with priority subscriber 

Description Number of successful TCH seizures of the type priority subscriber.

Updated When the RRM allocates a TCH as a response to a TCH request in

either a call or HO attempt and the MS priority level in the priority

information element (PIE) indicates that the MS is a priority

subscriber.

Dependencies with other 

counters/PI(s)

Counter 001008 or 001009 is updated along with this counter.

Feature BSS5190 Enhanced Trunk Reservation

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Number 

Name

Release

001097

NO PRI SUBSCR REFUSED TCH REQ

S5

Trigger points See figure Unsuccessful trunk reservation

Description Number of TCH requests of the type non-priority subscriber that are

rejected because there are no resources available to subscribers

other than priority subscribers.

Updated When the RRM rejects a TCH request because of no resources

available to subscribers other than priority subscribers.

Dependencies with other 

counters/PI(s)

Counter 001042 is updated along with this counter.

Feature BSS5190 Enhanced Trunk Reservation

Number 

Name

Release

001098

TCH SEIZ ATT DUE SDCCH CON

S5

Trigger points See figures:

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion

Description Number of attempts to seize a TCH because of SDCCH congestion.

Updated When the RRM attempts to allocate a TCH as a response to a

request for an SDCCH seizure during SDCCH congestion. The RRM

does this if the TCH allocation (=FACCH setup) is allowed in the

message carrying the request for the SDCCH seizure.

Dependencies with other 

counters/PI(s)

Counters 001010 and 001043 are updated along with this counter.

Feature BSS5290 FACCH Call Setup because of SDCCH Congestion

Number 

Name

Release

001099

TCH SEIZ DUE SDCCH CON

S5

Trigger points See figure FACCH call setup because of SDCCH congestion with

counters

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Number 

Name

Release

001099

TCH SEIZ DUE SDCCH CON

S5

Description Number of successful TCH seizures because of congestion on the

SDCCH.

Updated When the RRM allocates a TCH as a response to a request for  

SDCCH seizure during congestion on the SDCCHs. The RRM

allocates a TCH if the TCH allocation (=FACCH setup) is allowed in

the message carrying the request for the SDCCH seizure.

Dependencies with other 

counters/PI(s)

This counter is updated along with counter 001044.

Feature BSS5290 FACCH Call Setup because of SDCCH Congestion

Number 

Name

Release

001100

TRUNK TCH REJECTED FR REQ

S5

Trigger points See figure Unsuccessful trunk reservation

Description Number of requests for trunk reservation function that result in the

rejection of TCH allocation when FR or preferred FR TCH has been

requested.

Updated When the RRM denies access by applying the trunk reservation

function and FR or preferred FR TCH has been requested.

Dependencies with other 

counters/PI(s)

Counter 001042 is updated along with this counter.

Feature BSS5010 Half Rate and BSS5190 Enhanced Trunk Reservation

Number 

Name

Release

001101

TRUNK TCH REJECTED HR REQ

S5

Trigger points See figure Unsuccessful trunk reservation

Description Number of requests for trunk reservation function that result in

rejection of TCH allocation when HR or preferred HR TCH has been

requested.

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Number 

Name

Release

001101

TRUNK TCH REJECTED HR REQ

S5

Updated When the RRM denies access by applying the trunk reservation

function and HR or preferred HR TCH has been requested.

Dependencies with other 

counters/PI(s)

Counter 001042 is updated along with this counter.

Feature BSS5010 Half Rate and BSS5190 Enhanced Trunk Reservation

Number 

Name

Release

001102

FULL TCH REQ SUCC UNSUCC

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs

. Unsuccessful trunk reservation

.

Successful internal intra-cell handover . Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful external handover, target 

. Successful forced release

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

.

Successful forced handover . Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of requests for FR TCH (both successful and unsuccessful).

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Number 

Name

Release

001102

FULL TCH REQ SUCC UNSUCC

S5

Updated When the RRM receives a TCH request either in a call or in a

handover attempt and FR TCH channel is requested.

NOTE! This counter is updated when the channel rate of the

requested TCH is defined to be FR only; the type of the TCH may be

limited either by an assignment request or a handover request from

the A interface, or it may be because of the BSC restricting the

selection of channel type in TCH allocation.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001103

HALF TCH REQ SUCC UNSUCC

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs

. Unsuccessful trunk reservation

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful external handover, target 

. Successful forced release

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Successful forced handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

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Number 

Name

Release

001103

HALF TCH REQ SUCC UNSUCC

S5

Description Number of requests for HR TCH requests (both successful and

unsuccessful).

Updated When the RRM receives a TCH request either in a call or HO attempt

and HR TCH channel is requested.

NOTE! This counter is updated when the channel rate of the

requested TCH is defined to be HR only; the type of the TCH may be

limited either by an assignment request or a handover request from

the A interface, or it may be because of the BSC restricting the

selection of channel type in TCH allocation.

Dependencies with other counters/PI(s) Counter 001010 is updated along with this counter.

Feature BSS5010 Half Rate

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Number 

Name

Release

001104

TCH REQ FULL PREFERRED

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful external handover, target 

. Successful forced release

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Successful forced handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of TCH requests with FR preferred (both successful and

unsuccessful).

Updated When the RRM receives a TCH request either in a call or HO attempt

and FR or HR TCH channel is requested alternatively with FR

preferred.

NOTE! The preferred channel rate can be defined either by an

assignment request or HO request received from the A interface or by

software which is activated on the BSC for controlling the selection of 

the channel type in TCH allocation. In the latter case the preferred

channel type can be quite the opposite to the one initially set by the

MSC.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS5010 Half Rate

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Number 

Name

Release

001105

TCH REQ HALF PREFERRED

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful external handover, target 

. Successful forced release

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Successful forced handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of TCH requests with HR preferred (both successful and

unsuccessful).

Updated When the RRM receives a TCH request either in a call or HO attempt

and FR or HR TCH channel is requested alternatively with HR

preferred.

NOTE! The preferred channel rate can be defined either by

assignment request or HO request received from the A interface or by

softwares which are activated on the BSC for controlling the selection

of the channel type in TCH allocation. In the latter case the preferred

channel type can be quite the opposite to the one initially set by the

MSC.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS5010 Half Rate

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Number 

Name

Release

001106

SUCC FULL TCH SEIZ

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Successful TCH queuing 

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Successful internal inter-cell handover 

. Successful external handover, target 

.

Successful forced release. Successful forced handover 

Description Number of successful FR TCH seizures.

Updated When the RRM allocates an FR TCH as a response to a TCH request.

Dependencies with other 

counters/PI(s)

Either counter 001008 or counter 001009 is updated along with this

counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001107

SUCC HALF TCH SEIZ

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Successful TCH queuing 

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Successful internal inter-cell handover 

. Successful external handover, target 

. Successful forced release

. Successful forced handover 

Description Number of successful HR TCH seizures.

Updated When the RRM allocates an HR TCH as a response to a TCH

request.

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Number 

Name

Release

001107

SUCC HALF TCH SEIZ

S5

Dependencies with other 

counters/PI(s)

Either counter 001008 or counter 001009 is updated along with this

counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001108

FULL TCH SEIZ SPEECH VER 1

S5

Trigger points See figures:

. Normal release

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Successful external handover, source

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Successful forced release

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of successful FR TCH seizures when speech FR version 1 is

in use.

Updated When an FR TCH allocated for speech is released and the FR codec

version 1 is in use.

Feature BSS5010 Half Rate

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Number 

Name

Release

001109

FULL TCH SEIZ SPEECH VER 2

S5

Trigger points See figures:

. Normal release

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Successful external handover, source

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Successful forced release

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of successful FR TCH seizures when speech FR version 2 is

in use.

Updated When an FR TCH allocated for speech is released and the FR codec

version 2 is in use.

Feature BSS5010 Half Rate

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Number 

Name

Release

001110

FULL TCH SEIZ SPEECH VER 3

S5

Trigger points See figures:

. Normal release

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Successful external handover, source

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Successful forced release

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of successful FR TCH seizures when speech FR version 3 is

in use.

Updated When an FR TCH allocated for speech is released and the FR codec

version 3 is in use.

Feature BSS5010 Half Rate

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Number 

Name

Release

001111

HALF TCH SEIZ SPEECH VER 1

S5

Trigger points See figures:

. Normal release

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Successful external handover, source

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Successful forced release

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of successful HR TCH seizures when speech FR version 1 is

in use.

Updated When an HR TCH allocated for speech is released and the HR codec

version 1 is in use.

Feature BSS5010 Half Rate

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Number 

Name

Release

001112

HALF TCH SEIZ SPEECH VER 2

S5

Trigger points See figures:

. Normal release

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Successful external handover, source

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Successful forced release

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of successful HR TCH seizures when speech FR version 2 is

in use.

Updated When an HR TCH allocated for speech is released and the HR codec

version 2 is in use.

Feature BSS5010 Half Rate

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Number 

Name

Release

001113

HALF TCH SEIZ SPEECH VER 3

S5

Trigger points See figures:

. Normal release

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Successful external handover, source

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Successful forced release

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of successful HR TCH seizures when speech FR version 3 is

in use.

Updated When an HR TCH allocated for speech is released and the HR codec

version 3 is in use.

Feature BSS5010 Half Rate

Number 

Name

Release

001114

FULL TCH SEIZ NORM ASSIGNMENT

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Successful TCH queuing 

. Successful forced release

. Successful forced handover 

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Number 

Name

Release

001114

FULL TCH SEIZ NORM ASSIGNMENT

S5

Description Number of successful FR TCH seizures for a normal assignment.

Updated When the RRM allocates an FR TCH as a response to a TCH request

in a call attempt.

Dependencies with other 

counters/PI(s)

Counter 001009 is updated along with this counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001115

HALF TCH SEIZ NORM ASSIGNMENT

S5

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. Successful TCH queuing 

. Successful forced release

. Successful forced handover 

Description Number of successful HR TCH seizures for a normal assignment.

Updated When the RRM allocates an HR TCH as a response to a TCH request

in a call attempt.

Dependencies with other 

counters/PI(s)

Counter 001009 is updated along with this counter.

Feature BSS5010 Half Rate

Number Name

Release

001116FULL TCH SEIZ INT HO CH RATE

S5

Trigger points See figures:

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Successful internal inter-cell handover 

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Number 

Name

Release

001116

FULL TCH SEIZ INT HO CH RATE

S5

Description Number of successful FR TCH seizures for an internal HO when the

channel rate changes.

Updated When the RRM allocates an FR TCH for an internal HO as a response

to a TCH request and the channel rate is changed from HR to FR.

Dependencies with other 

counters/PI(s)

Counters 001008 and 001106 are updated along with this counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001117

HALF TCH SEIZ INT HO CH RATE

S5

Trigger points See figures:

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Successful internal inter-cell handover 

Description Number of successful HR TCH seizures for an internal HO when the

channel rate changes.

Updated When the RRM allocates an HR TCH for an internal HO as a

response to a TCH request and the channel rate is changed from FR

to HR.

Dependencies with other 

counters/PI(s)

Counters 001008 and 001107 are updated along with this counter.

Feature BSS5010 Half Rate

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Number 

Name

Release

001118

REJ TCH REQ DUE LACK FR

S5

Trigger points See figures:

. Basic call 

. Basic call, no free TCHs

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of TCH requests that are rejected because of a lack of  

resources when FR or preferred FR TCH is requested.

Updated When no TCHs are available when requested from the RRM either in

a call or HO attempt and either FR or preferred FR TCH was

requested. The counter may be updated immediately after the TCH

request or, in case of queuing, after the queuing timer expires.

Dependencies with other 

counters/PI(s)

Counter 001011 is updated along with this counter.

Feature BSS5010 Half Rate

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Number 

Name

Release

001119

REJ TCH REQ DUE LACK HR

S5

Trigger points See figures:

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Basic call, no free TCHs

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of TCH requests that are rejected because of a lack of  

resources, when HR or preferred HR TCH is requested.

Updated When no TCHs are available when requested from the RRM either in

a call or HO attempt and either HR or preferred HR TCH was

requested. The counter may be updated immediately after the TCH

request or, in case of queuing after the queuing, timer expires.

Dependencies with other counters/PI(s)

Counter 001011 is updated along with this counter.

Feature BSS5010 Half Rate

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Number 

Name

Release

001120

FULL TCH REJ DUE HR TRAF

S5

Trigger points See figures:

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs

. Unsuccessful trunk reservation

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Successful forced release

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Successful forced handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of requests for FR TCHs that are rejected because of HR

traffic, whether queuing occurred or not.

Updated When no FR TCH is available in a situation where HR calls are being

maintained in DR TSLs and there are free HR TCHs among the DR or 

permanent HR resources for at least two HR calls.

NOTE! The counter is incremented on receipt of the request for the

FR TCH, regardless of whether the request is set in the queue, pre-

empted, subjected to directed retry or some other procedure of the

kind.

Feature BSS5010 Half Rate

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Number 

Name

Release

001121

HALF TCH REJ DUE FR TRAF

S5

Trigger points See figures:

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs

. Unsuccessful trunk reservation

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Successful forced release

. Unsuccessful forced release

. Unsuccessful forced release with external handover 

. Successful forced handover 

. Unsuccessful forced handover 

. Unsuccessful forced handover with external handover 

Description Number of requests for HR TCHs that are rejected because of FR

traffic, whether queuing occurred or not.

Updated When no HR TCH is available in a situation where a FR call is being

maintained in a DR TSL and at the same time there is a permanent

FR type TSL free.

NOTE! The counter is incremented on receipt of the request for HR

TCH, regardless of whether the request is set in the queue, pre-

empted, subjected to directed retry or some other procedure of the

kind

Feature BSS5010 Half Rate

Number 

Name

Release

001122

TCH REJ DUE REQ CH A IF CRC

S5

Trigger points See figure TCH assignment failure with cause switch_circuit_pool 

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Number 

Name

Release

001122

TCH REJ DUE REQ CH A IF CRC

S5

Description Number of requests for TCHs that are rejected because of a mismatch

between the types of the requested channel and the A interface

circuit, whether queuing occurred or not.

Updated When the RRM changes the A interface circuit pool before TCH

allocation.

Dependencies with other 

counters/PI(s)

Counter 001011 and counter 001118 or 001119 are updated along

with this counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001123

FULL TCH REQ FACCH CALL

S5

Trigger points See figures:

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

Description Number of requests for FR TCH in FACCH call setup during SDCCHcongestion (both successful and unsuccessful).

Updated When the RRM receives a request for SDCCH allocation but no idle

SDCCHs exist and TCH allocation (=FACCH call setup) is allowed in

the request which also indicates that the TCH rate should be FR.

Dependencies with other 

counters/PI(s)

Counters 001010, 001043 and 001098 are updated along with this

counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001124

TCH FACCH CALL CH RATE NOT DEF

S5

Trigger points See figures:

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

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Number 

Name

Release

001124

TCH FACCH CALL CH RATE NOT DEF

S5

Description Number of requests for TCHs in FACCH call setup during SDCCH

congestion when the TCH rate is not defined to be uniquely FR or HR

(both successful and unsuccessful).

Updated When the RRM receives a request for SDCCH allocation but no idle

SDCCHs exist and TCH allocation (=FACCH call setup) is allowed in

the request which also indicates that either of the two possible

channel rates is accepted to be allocated.

Dependencies with other 

counters/PI(s)

Counters 001010, 001043 and 001098 are updated along with this

counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001125

SUCC FULL TCH SEIZ FACCH CALL

S5

Trigger points See figure FACCH call setup because of SDCCH congestion with

counters

Description Number of successful FR TCHs seizures for a FACCH call setup.

Updated When the RRM allocates an FR TCH as a response to an SDCCH

request as part of the FACCH call setup during SDCCH congestion.

Dependencies with other 

counters/PI(s)

Counter 001044 is updated along with this counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001126

SUCC HALF TCH SEIZ FACCH CALL

S5

Trigger points See figure FACCH call setup because of SDCCH congestion with

counters

Description Number of successful HR TCHs seizures for a FACCH call setup.

Updated When the RRM allocates an HR TCH as a response to an SDCCH

request as part of the FACCH call setup during SDCCH congestion.

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Number 

Name

Release

001126

SUCC HALF TCH SEIZ FACCH CALL

S5

Dependencies with other 

counters/PI(s)

Counter 001044 is updated along with this counter.

Feature BSS5010 Half Rate

Number 

Name

Release

001127

ENDED DUE TRANSC FR RATE 1

S5

Trigger points See figures:

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. Unsuccessful internal intra-cell handover 

Description Number of radio TCH transactions that are ended because of a

transcoder failure when speech FR version 1 is in use.

Updated When one of the transcoder failure counters 001029, 001030 or  

001031 is updated and the FR codec version 1 is in use.

Feature BSS5010 Half Rate

Number 

Name

Release

001128

ENDED DUE TRANSC FR RATE 2

S5

Trigger points See figures:

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. Unsuccessful internal intra-cell handover 

Description Number of radio TCH transactions that are ended because of a

transcoder failure when speech FR version 2 is in use.

Updated When one of the transcoder failure counters 001029, 001030 or  

001031 is updated and the FR codec version 2 is in use.

Feature BSS5010 Half Rate

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Number 

Name

Release

001129

ENDED DUE TRANSC FR RATE 3

S5

Trigger points See figures:

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. Unsuccessful internal intra-cell handover 

Description Number of radio TCH transactions that are ended because of a

transcoder failure when speech FR version 3 is in use.

Updated When one of the transcoder failure counters 001029, 001030 or  

001031 is updated and the FR codec version 3 is in use.

Feature BSS5010 Half Rate

Number 

Name

Release

001130

ENDED DUE TRANSC HR RATE 1

S5

Trigger points See figures:

. CONNECTION_FAILURE message with cause transcoder_failure

during a call . Unsuccessful internal intra-cell handover 

Description Number of radio TCH transactions that are ended because of a

transcoder failure when speech HR version 1 is in use.

Updated When one of the transcoder failure counters 001029, 001030, or  

001031 is updated and the HR codec version 1 is in use.

Feature BSS5010 Half Rate

Number 

Name

Release

001131

ENDED DUE TRANSC HR RATE 2

S5

Trigger points See figures:

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. Unsuccessful internal intra-cell handover 

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Number 

Name

Release

001131

ENDED DUE TRANSC HR RATE 2

S5

Description Number of radio TCH transactions that are ended because of a

transcoder failure when speech HR version 2 is in use.

Updated When one of the transcoder failure counters 001029, 001030 or  

001031 is updated and the HR codec version 2 is in use.

Feature BSS5010 Half Rate

Number 

Name

Release

001132

ENDED DUE TRANSC HR RATE 3

S5

Trigger Points See figures:

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. Unsuccessful internal intra-cell handover,

CONNECTION_FAILURE message with cause

remote_transcoder_failure comes to the target channel 

Description Number of radio TCH transactions that are ended because of a

transcoder failure when speech HR version 3 is in use.

Updated When one of the transcoder failure counters 001029, 001030 or  

001031 is updated and the HR codec version 3 is in use.

Feature BSS5010 Half Rate

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Number 

Name

Release

001133

FULL TCH TR FAIL

S5

Trigger points See figures:

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure, MSC sends CLEAR_COMMAND

message

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Total number of FR TCH transaction failures.

Updated When an FR TCH transaction ends because of any abnormal reason,

that is, some specific failure counter has been updated, and the RRM

releases the FR TCH.

Feature BSS5010 Half Rate

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Number 

Name

Release

001134

HALF TCH TR FAIL

S5

Trigger points See figures:

. Unsuccessful TCH activation

. Unsuccessful TCH activation

. TCH assignment failure

. TCH assignment failure, MSC sends CLEAR_COMMAND

message

. CONNECTION_FAILURE message with cause transcoder_failure

during a call 

. TRX or TSL is blocked with different causes during a call 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover 

. Unsuccessful internal intra-cell handover, timer expires on the

source channel 

. Unsuccessful internal inter-cell handover 

. Unsuccessful external handover, source BSC 

. Unsuccessful external handover, MS sends a handover failure

. Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Total number of HR TCH transaction failures.

Updated When an HR TCH transaction ends because of any abnormal reason,

that is, some specific failure counter has been updated, and the RRM

releases the HR TCH.

Feature BSS5010 Half Rate

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Number 

Name

Release

001135

SDCCH SEIZ ATT FOR MOC

S6

Trigger points See figures:

. Basic call with counters

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. SDCCH congestion, FACCH call setup is not activated 

. Successful SDCCH internal intra-cell handover 

. Successful SDCCH internal inter-cell handover 

. Reconfiguration from TCH to SDCCH 

Description Number of SDCCH seizure attempts for an MOC. In case of an

external handover and handovers after external handover this counter 

is not incremented. In case of an intra-cell or inter-cell (SDCCH to

SDCCH) handover this counter is updated.

Updated When the RRM receives a request for a SDCCH from an MS because

the MS needs a channel for a MOC. Note that this counter contains

all requests for an SDCCH in originating direction, for example Mobile

Originating calls, Location Updates, Supplementary Service requests

and SMS on SDCCH. In case of an SMS this counter is triggered

even if the SMS would eventually be sent on TCH instead of SDCCH.

Dependencies with other 

counters/PI(s)

Counter 001000 is updated along with this counter.

Number 

Name

Release

001136

SDCCH SEIZ ATT FOR MTC

S6

Trigger points See figures:

. Basic call with counters

.

FACCH call setup because of SDCCH congestion with counters. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. SDCCH congestion, FACCH call setup is not activated 

. Successful SDCCH internal intra-cell handover 

. Successful SDCCH internal inter-cell handover 

. Reconfiguration from TCH to SDCCH 

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Number 

Name

Release

001136

SDCCH SEIZ ATT FOR MTC

S6

Description Number of SDCCH seizure attempts for an MTC. In case of an

external handover and handovers after external handover this counter 

is not incremented. In case of an intra-cell or inter-cell (SDCCH to

SDCCH) handover this counter is updated.

Updated When the RRM receives a request for a SDCCH from an MS as the

MS needs a channel for a MTC. Note that this counter contains all

requests for an SDCCH in terminating direction, for example Mobile

Terminating calls and SMS on SDCCH. In case of an SMS this

counter is triggered even if the SMS would eventually be sent on TCH

instead of SDCCH.

Dependencies with other counters/PI(s)

Counter 001000 is updated along with this counter.

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Number 

Name

Release

001137

TCH SEIZ ATT FOR MOC

S6

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs, unsuccessful queuing and directed retry 

not activated 

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful forced release

. Unsuccessful forced release

. Successful forced handover 

. Unsuccessful forced handover 

Description Number of TCH seizure attempts during an MOC, in call setup phase

before connection acknowledgement. In case of an external handover 

and handovers after external handover this counter is not

incremented. In case of an intra-cell or inter-cell (TCH to TCH or 

SDCCH to TCH) handover this counter is updated.

Updated When RRM receives requests for a TCH for an MOC. In FACCH call

setup RRM attempts to allocate a TCH as a response to a request for an SDCCH seizure during SDCCH congestion.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

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Number 

Name

Release

001138

TCH SEIZ ATT FOR MTC

S6

Trigger points See figures:

. Basic call with counters

. Basic call with priority subscriber 

. FACCH call setup because of SDCCH congestion with counters

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Successful TCH queuing 

. Basic call, no free TCHs, unsuccessful queuing and directed retry 

not activated 

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful trunk reservation

. Successful internal intra-cell handover 

. Internal intra-cell HO, successful TCH queuing 

. Unsuccessful underlay overlay internal intra-cell handover,

queuing not allowed 

. Internal intra-cell handover, unsuccessful TCH queuing 

. Internal directed retry 

. Successful internal inter-cell handover 

. Successful forced release

. Unsuccessful forced release

. Successful forced handover 

. Unsuccessful forced handover 

Description Number of TCH seizure attempts during an MTC, in call setup phase

before connection acknowledgement. In case of an external handover 

and handovers after external handover this counter is not

incremented. In case of an intra-cell or inter-cell (TCH to TCH or 

SDCCH to TCH) handover this counter is updated.

Updated When RRM receives requests for a TCH for an MTC. In FACCH call

setup RRM attempts to allocate a TCH as a response to a request for an SDCCH seizure during SDCCH congestion.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

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Number 

Name

Release

001139

TCH REL because of RADIO FAIL

S6

Trigger points See figure Timer T3107 expires while waiting for 

  ASSIGNMENT_COMPLETE message

Description Number of TCH releases because of radio failures, in call setup phase

before connection acknowledgement. This counter is also updated in

an intra-cell or inter-cell handover, if the TCH is released because of a

radio failure before the conversation phase (handover is started and it

fails before a connection acknowledgement message is received).

Updated When a TCH is released because of a radio failure.

Dependencies with other 

counters/PI(s)

Counter 001013 is updated along with this counter.

Number 

Name

Release

001140

TCH REL DUE TO BSS FAIL

S6

Trigger points See figures:

. Unsuccessful TCH activation

. TCH assignment failure, MSC sends CLEAR_COMMAND

message

Description Number of TCH releases because of BSS failures, in call setup phase

before connection acknowledgement. This counter is also updated in

intra-cell or inter-cell handover, if the TCH is released because of BSS

problems before conversation phase (handover is started and fails

before connection acknowledgement message is received).

Updated When a TCH is released because of BSS problems.

Dependencies with other 

counters/PI(s)

Counter 001012 is updated along with this counter.

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Number 

Name

Release

001141

TCH SEIZ FAILS DUE TO CONG

S6

Trigger points See figures:

. FACCH call setup because of SDCCH congestion, no free TCH 

channel 

. Basic call, no free TCH and queuing or directed retry is not 

allowed 

. Basic call, no free TCHs, unsuccessful queuing and directed retry 

not activated 

. TCH assignment failure with cause switch_circuit_pool 

. Unsuccessful forced release

. Unsuccessful forced handover 

Description Number of TCH seizure failures because of congestion during call

setup before connection acknowledgement. This counter is also

updated in intra-cell or inter-cell handover, if the TCH attempt fails

because of congestion before conversation phase (handover is

started and fails before connection acknowledgement message is

received). In case of an external handover and handovers after 

external handover this counter is not incremented.

Updated When RRM rejects a TCH request because of congestion. This

counter is updated only in these DX phases: MM Signalling (2), Basic

 Assignment (3), FACCH Assignment (5) or Ciphering (8).

Dependencies with other 

counters/PI(s)

Counter 001011 is updated along with this counter.

Number 

Name

Release

001142

QUEUED URGENT HANDOVER ATTEMPTS

S6

Trigger points See figures:

. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

Description Number of queued urgent handover attempts.

Updated When a TCH request for an urgent handover attempt is put to the

queue because of a lack of available TCH resources requested.

Dependencies with other 

counters/PI(s)

Counters 001010 and 001064 are updated along with this counter.

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Number 

Name

Release

001142

QUEUED URGENT HANDOVER ATTEMPTS

S6

Feature BSS6115 Radio Channel Allocation Enhancements

Number 

Name

Release

001143

AVE QUE TIME OF URGENT HO ATTEMPTS

S6

Trigger points See figures:

. Internal intra-cell HO, successful TCH queuing 

.

Internal intra-cell handover, unsuccessful TCH queuing 

Description Numerator of average queuing time of queued urgent handover 

attempts (unit of the value is 10 ms).

Updated When a TCH request for an urgent handover attempt is removed from

the queue (both in a successful and an unsuccessful case).

Dependencies with other 

counters/PI(s)

In a successful case counters 001008, 001022 and 001144 are

updated along with this counter. In an unsuccessful case counters

001022, 001025, 001068 and 001144 are updated along with this

counter.

Feature BSS6115 Radio Channel Allocation Enhancements

Logical type Average

Unit 10 ms

Number 

Name

Release

001144

QUE DENOMINATOR 4

S6

Trigger points See figures:. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

Description Denominator of average queuing time of queued urgent handover 

attempts.

Updated Every 20 seconds. The averaging is made within the measurement

period.

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Number 

Name

Release

001144

QUE DENOMINATOR 4

S6

Dependencies with other 

counters/PI(s)

Counter 001143 is updated along with this counter.

Feature BSS6115 Radio Channel Allocation Enhancements

Number 

Name

Release

001145

AVE QUE TIME OF NON URGENT HO ATTEMPTS

S6

Trigger points See figures:

. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

Description Numerator of average queuing time of queued non-urgent handover 

attempts.

Updated When a TCH request for a non-urgent HO attempt is removed from

the queue (both in a successful and unsuccessful case).

Dependencies with other 

counters/PI(s)

In a successful case counters 001008, 001022 and 001146 are

updated along with this counter. In an unsuccessful case counters

001022, 001025, 001068 and 001146 are updated along with thiscounter.

Feature BSS6115 Radio Channel Allocation Enhancements

Logical type Average

Number 

Name

Release

001146

QUE DENOMINATOR 5

S6

Trigger points See figures:

. Internal intra-cell HO, successful TCH queuing 

. Internal intra-cell handover, unsuccessful TCH queuing 

Description Denominator of average queuing time of queued urgent HO attempts

(unit of the value is 10 ms).

Updated Every 20 seconds. The averaging is made with the measurement

period.

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Number 

Name

Release

001146

QUE DENOMINATOR 5

S6

Dependencies with other 

counters/PI(s)

Counter 001145 is updated along with this counter.

Feature BSS6115 Radio Channel Allocation Enhancements

Unit 10 ms

Number 

Name

Release

001147

QUEUED URG HO ATTS NOT SERVED

S6

Trigger points See figure Internal intra-cell handover, unsuccessful TCH queuing 

Description Number of queued urgent handover attempts not served.

Updated When the urgent HO attempt is removed from the queue because of  

queuing timer expiry or substitution by a higher priority queuing item.

Dependencies with other 

counters/PI(s)

Counters 001022, 001025, 001068 and 001143 are updated along

with this counter.

Feature BSS6115 Radio Channel Allocation Enhancements

Number 

Name

Release

001148

MS SUCC TCH SEIZURE FOR ASSIGNMENT COMPLETE

S7

Trigger points See figure Normal call 

Description Number of times when a MS is successfully on the TCH after an

  ASSIGNMENT_COMPLETE message.

Updated When an ASSIGNMENT_COMPLETE message is received from the

MS via BTS to TCH. The TCH is reserved and the MS is moved from

the SDCCH to the TCH. This counter is updated only when a call is

established for the first time, not during handovers.

This counter is not updated with softwares FACCH call setup because

of SDCCH congestion, directed retry procedure in BSC, TCH

assignment to super reuse TRX in IUO and direct access to super re-

use TRX in IUO.

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Number 

Name

Release

Definition updated

001149

CALLS ENDED BY USER DURING DADL/B SETUP

S7

S11.5

Description Number of CALLS RELEASED BY USER in a call setup phase during

DADL/B handover.

Updated When the user releases the call in call setup phase and BSC has

started to evaluate the potential target cells for DADL/B handover.

Number Name

Release

001150SUCC TCH SEIZ WHEN GOOD QUAL IN ADJACENTS

S8

Trigger points See figure Basic call. Optional software dynamic hotspot is activated 

Description Number of TCH requests that are accepted by the dynamic hotspot

algorithm when there is good signal quality in adjacent cells.

Updated When a TCH request is accepted by the dynamic hotspot algorithm

and the signal quality in all adjacent cells is above the threshold

GoodQualLimit and the traffic intensity in the source cell is above the

threshold SoftBlockingStart.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS7019 Dynamic Hotspot

Number 

Name

Release

001151

TCH REQ REJ DUE TO BAD QUALITY IN ADJACENT

S8

Trigger points See figure Basic call. Optional software dynamic hotspot is activated 

Description Number of TCH requests rejected by the dynamic hotspot algorithm

because of bad signal quality in an adjacent cell.

Updated When a TCH request is rejected by the dynamic hotspot algorithm

and the signal quality in at least one adjacent cell is below the

threshold BadQualLimit and the traffic intensity in the source cell is

above the threshold SoftBlockingStart.

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Number 

Name

Release

001151

TCH REQ REJ DUE TO BAD QUALITY IN ADJACENT

S8

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS7019 Dynamic Hotspot

Number 

Name

Release

001152

SUCC TCH SEIZ WHEN QUAL BETW GOOD AND BAD IN

ADJACENT

S8

Trigger points See figure Basic call. Optional software dynamic hotspot is activated 

Description Number of TCH requests accepted by the dynamic hotspot algorithm

when the signal quality is between good and bad in adjacent cells.

Updated When a TCH request is accepted by the dynamic hotspot algorithm

and the signal quality in all adjacent cells is above the threshold

BadQualLimit, in at least one adjacent cell below the threshold

GoodQualLimit, and the traffic intensity in source cell is above the

threshold SoftBlockingStart.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS7019 Dynamic Hotspot

Number 

Name

Release

001153

TCH REQ REJ WHEN QUAL BETW GOOD AND BAD IN

ADJACENT

S8

Trigger points See figure Basic call. Optional software dynamic hotspot is activated 

Description Number of TCH requests that are rejected by the dynamic hotspot

algorithm when the signal quality is between good and bad in adjacent

cells.

Updated When a TCH request is rejected by the dynamic hotspot algorithm

and the signal quality in all adjacent cells is above the threshold

BadQualLimit, in at least one adjacent cell below the threshold

GoodQualLimit, and the traffic intensity in the source cell is above the

threshold SoftBlockingStart.

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Number 

Name

Release

001153

TCH REQ REJ WHEN QUAL BETW GOOD AND BAD IN

ADJACENT

S8

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS7019 Dynamic Hotspot

Number 

Name

Release

001154

DYNAMIC SDCCH RECONFIGURATION ATTEMPT

S7

Trigger points See figure Reconfiguration from TCH to SDCCH 

Description Number of SDCCH reconfiguration attempts for immediate

assignment.

Updated When a SDCCH channel is needed for an immediate assignment and

no free SDCCHs are available and the request is sent for 

reconfiguring a TCH channel to a SDCCH channel. This counter is not

updated if reconfiguration is done from SDCCH to TCH channel.

Dependencies with other 

counters/PI(s)

Counters 001000 and 001007 are updated along with this counter.

Feature BSS7036 Dynamic SDCCH allocation

Number 

Name

Release

001155

UNSUCC IMM ASS SDCCH ATTEMPT

S7

Trigger points See figure FACCH call setup because of SDCCH congestion with

counters

Description Number of unsuccessful SDCCH allocation attempts for immediate

assignment.

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Number 

Name

Release

001155

UNSUCC IMM ASS SDCCH ATTEMPT

S7

Updated When the SDCCH channel allocation does not succeed because of a

lack of SDCCH resources at the time of the immediate assignment.

When SDCCH is released with the dx-cause rtsl_reconf_fail_c.

Triggered for example when a dynamic SDCCH allocation (1154

DYNAMIC_SDCCH_RECONFIGURATION_ATTEMPT) is tried but it

fails. Failure can be caused for example by the following situations.

. In the BCSU there cannot be more SDCCH allocated.

.  All TCHs are busy and cannot be reallocated.

. RRM has reconfigured a TCH to SDCCH but ABI cannot do the

same. In this case the dynamic SDCCH seized by RRM is

released with cause rtsl_reconf_fail and the call attempt fails

(blocking).

Dependencies with other 

counters/PI(s)

Counter 001001 is updated along with this counter.

Feature BSS7036 Dynamic SDCCH allocation

Number 

Name

Release

001156

HSCSD TCH REQ WITH 14,4

S7

Trigger points See figures:

. Mobile originated HSCSD call setup

. Successful internal inter-cell handover 

Description Number of TCH requests for 14.4 kbit/s data.

NOTE! Despite its name, this counter is not related to High Speed

Circiuit Switched Data (HSCSD), but the single slot 14.4 kbit/s data

services.

Updated When the RRM receives a TCH request for a single slot 14.4 kbit/s

data connection in a call or a handover attempt.

Dependencies with other 

counters/PI(s)

Counters for a TCH request.

Feature BSS7037 14.4 kbit/s data services

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Number 

Name

Release

001157

HSCSD SUCC TCH SEIZ WITH 14,4

S7

Trigger points See figures:

. Mobile originated HSCSD call setup

. Successful internal inter-cell handover 

Description Number of successful TCH seizures for 14.4 kbit/s data.

NOTE! Despite of its name, this counter is not related to High Speed

Circiuit Switched Data (HSCSD), but the single slot 14.4 kbit/s data

services.

Updated When the RRM allocates a TCH/F as a response to a single slot 14.4kbit/s request in a call or handover attempt.

Dependencies with other 

counters/PI(s)

Counters for a successful TCH seizures.

Feature BSS7037 14.4 kbit/s data services

Number 

Name

Release

001158

HSCSD TRANSP TCH REQ

S7

Trigger points See figures:

. Mobile originated HSCSD call setup

. Successful internal inter-cell handover 

Description Number of transparent HSCSD TCH requests.

Updated When TCH/F(s) is / are requested for a transparent HSCSD service

from the RRM in a call or a handover attempt.

Dependencies with other 

counters/PI(s)

Counter 001160 or 001161 is updated along with this counter.

Feature BSS7003 High speed circuit switched data

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Number 

Name

Release

001159

HSCSD SUCC TRANSP TCH SEIZ

S7

Trigger points See figures:

. Mobile originated HSCSD call setup

. Successful internal inter-cell handover 

Description Number of successful transparent HSCSD TCH seizures.

Updated When TCH/F has been successfully allocated for transparent HSCSD

service by RRM. Incrementation is made only by the HSCSD main

channel allocation.

Dependencies with other 

counters/PI(s)

Counter 001162 or 001163 is updated along with this counter.

Feature BSS7003 High speed circuit switched data

Number 

Name

Release

001160

HSCSD REQ FOR CALL SETUP

S7

Trigger points See figure Mobile originated HSCSD call setup

Description Number of HSCSD TCH requests for a call set-up.

Updated When the HSCSD data connection is requested from the RRM in a

call attempt.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS7003 High speed circuit switched data

Number 

Name

Release

001161

HSCSD TCH REQ FOR HO

S7

Trigger points See figure Successful internal inter-cell handover 

Description Number of HSCSD TCH requests for a HO.

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Number 

Name

Release

001161

HSCSD TCH REQ FOR HO

S7

Updated When the HSCSD data connection is requested from the RRM in a

handover attempt.

Dependencies with other 

counters/PI(s)

Counter 001010 is updated along with this counter.

Feature BSS7003 High speed circuit switched data

Number 

Name

Release

001162

HSCSD SUCC TCH SEIZ FOR CALL SETUP

S7

Trigger points See figure Mobile originated HSCSD call setup

Description Number of successful HSCSD TCH seizures for a call set-up.

Updated When the RRM allocates a main HSCSD TCH/F as a response to an

HSCSD call attempt.

Dependencies with other 

counters/PI(s)

Counter 001009 is updated along with this counter.

Feature BSS7003 High speed circuit switched data

Number 

Name

Release

001163

HSCSD SUCC TCH SEIZ FOR HO

S7

Trigger points See figure Successful internal inter-cell handover 

Description Number of successful HSCSD TCH seizures for a HO.

Updated When the RRM allocates a main HSCSD TCH/F as a response to a

handover attempt.

Dependencies with other 

counters/PI(s)

Counter 001008 is updated along with this counter.

Feature BSS7003 High speed circuit switched data

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Number 

Name

Release

001164

HSCSD CON REL DUE TO FAIL

S7

Trigger points See figure A CONNECTION_FAILURE message which comes during 

an HSCSD

Description Number of HSCSD connection releases because of a failure.

Updated When the HSCSD main TCH/F is released with dx_cause indicating a

failure.

Feature BSS7003 High speed circuit switched data

Impact HO failure, Call cleared

Number 

Name

Release

001165

SUCCESS TCH SEIZURE FOR DIRECT ACCESS

S7

Trigger points See figure Internal intra-cell direct access from a regular DCCH to the

super-reuse TRX 

Description Number of successful seizures for a TCH in direct accesses to a

super-reuse TRX during the call setup phase.

Updated When the RRM allocates a TCH as a response to a TCH request in a

call attempt using direct access to a super-reuse TRX procedure.

Dependencies with other 

counters/PI(s)

Counters 001009 and 001091 are updated along with this counter.

Feature BSS7057 Direct access to super re-use TRX in IUO

Number 

Name

Release

001166

TCH REQUEST FOR DIRECT ACCESS REJECTED DUE TO

LACK

S7

Trigger points See figure Unsuccessful internal intra-cell direct access from regular 

DCCH to the super-reuse TRX 

Description Number of requests for a direct access to a super-reuse TRX that are

rejected because of a lack of resources during the call setup phase.

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Number 

Name

Release

001166

TCH REQUEST FOR DIRECT ACCESS REJECTED DUE TO

LACK

S7

Updated When the RRM has no TCHs available for assignment requests in a

direct access attempt to a super-reuse TRX.

Dependencies with other 

counters/PI(s)

Counters 001011 and 001092 are updated along with this counter.

Feature BSS7057 Direct access to super re-use TRX in IUO

Number 

Name

Release

001167

TCH REQUEST FOR A BSC CONTROLLED TRHO

PROCEDURE

S8

Trigger points See figure Successful BSC controlled TRHO

Description Number of TCH requests for a BSC-controlled TRHO procedure.

Updated When the RRM receives a TCH request in a BSC-controlled TRHO

attempt

Feature BSS8123 Advanced Multilayer Handling

Number 

Name

Release

001168

SUCC TCH SEIZ FOR A BSC CONTROLLED TRHO

S8

Trigger points See figure Successful BSC controlled TRHO

Description Number of successful TCH seizures for a BSC-controlled TRHO

Updated When the RRM allocates a TCH as a response to a TCH request in aBSC-controlled TRHO attempt.

Feature BSS8123 Advanced Multilayer Handling

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Number 

Name

Release

001169

REJ TCH SEIZ FOR A BSC CONTROLLED TRHO DUE

LACK OF RESOURCES

S8

Trigger points See figure Unsuccessful BSC controlled TRHO

Description Number of rejected TCH requests for a BSC-controlled TRHO

procedure because of exceeded load in the target cell.

Updated When the RRM rejects traffic channel allocation because of exceeded

load in the target cell in a BSC-controlled TRHO.

Feature BSS8123 Advanced Multilayer Handling

Number 

Name

Release

001170

SUCCESSFUL TCH SEIZURES FOR DADLB HO

S8

Trigger points See figure Successful handover because of DADL/B

Description The number of successful TCH seizures because of DADL/B

handover.

Updated The counter is updated when a TCH allocation in the target cell during

DADL/B handover is successful. BSC internal handover case.

Feature BSS8032 Direct Access to Desired Layer/band

Number 

Name

Release

001171

TCH REQUEST IN DADLB HO REJECTED

S8

Trigger points See figure Unsuccessful DADL/B handover because of lack of 

resources

Description Number of TCH requests in DADL/B handover rejected because of a

lack of TCH.

Updated The counter is updated when a TCH allocation in the target cell during

DADL/B handover is unsuccessful because of lack of TCH. BSC

internal handover case.

Feature BSS8032 Direct Access to Desired Layer/band

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Number 

Name

Release

001172

DADLB START DUE TO EXCEEDED LOAD

S8

Trigger points See figures:

. Successful handover because of DADL/B

. Unsuccessful DADL/B handover because of lack of resources

Description Number of DADL/B handover attempts, started because of exceeded

load in accessed cell.

Updated This counter is updated when channel request is rejected because of  

excessive load and Radio Resource management requests a DADL/B

handover. If the target cell is found within MaxTimeLimitDR, the

DADL/B handover is started and also the counter 4129 is updated. If 

this timer triggers the DADL/B handover is not started.

Dependencies with other 

counters/PI(s)

004129 is updated if DADL/B HO is started.

Feature BSS8032 Direct Access to Desired Layer/band

Number 

Name

Release

001173

REMOVAL FROM QUE DUE TO DR

S8

Trigger points See figure Internal directed retry 

Description Number of requests removed from the queue because of start of DR.

Updated This counter is updated when a request is removed from the queue by

the RRM because of the start of DR.

Number 

Name

Release

001174

GPRS TER UPGRD REQ

S9

Description Number of territory upgrade requests received from the Packet

Controller Unit.

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Number 

Name

Release

001174

GPRS TER UPGRD REQ

S9

Updated When the Radio Resource Management receives from the Packet

Controller Unit a request for new radio time slots to be added into the

GPRS territory. The PCU can request an upgrade after BSC has

fulfilled the default territory defined by the operator parameters.

The upgrade of the GPRS territory may be started for various

reasons, for example when GPRS is set enabled in a BTS, GPRS-

TRX is created or deblocked, TSL inside the GPRS territory is

deblocked or CS load decreases, but this counter is not triggered in

these cases.

NOTE! This counter is triggered only when GPRS Territory Upgrade is

started by Packet Switched Radio Resource Management requesting

additional GPRS capacity.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

Number 

Name

Release

001175

INCOMPL SERV GPRS TER UPGR REQ

S9

Description Number of territory upgrade requests that have been served with less

radio time slots than requested.

Updated WhenRadio Resource Management upgrades the GPRS territory with

less RTSLs than the Packet Controller Unit requested for.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

Number 

Name

Release

001176

GPRS TER UG REJ DUE CSW TR

S9

Description Number of territory upgrade requests that have been rejectedbecause of the high load of the circuit switched traffic.

Updated When Radio Resource Management rejects a GPRS territory upgrade

request from the PCU because of high traffic load in BTS and

maintaining the margin of idle TCHs for circuit switched traffic does

not allow the upgrade.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

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Number 

Name

Release

001177

GPRS TER UG REJ DUE LACK PSW RES

S9

Description Number of territory upgrade requests that have been rejected

because there are not enough resources capable of GPRS in the

BTS.

Updated When Radio Resource Management rejects a GPRS territory upgrade

request of the PCU because all TRXs capable of GPRS traffic are

already within the GPRS territory.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

Number 

Name

Release

001178

GPRS TER UG REJ DUE LACK PCU CAP

S9

Description Number of territory upgrade requests that have been rejected

because the capacity of the Packet Controller Unit the BTS is

connected to is already totally in use.

Updated When Radio Resource Management rejects a GPRS territory upgrade

request from the PCU because the maximum number of TSLs, which

the PCU is capable to handle are already in use.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

Number 

Name

Release

001179

GPRS TER DG DUE INC IN CSW TR

S9

Description Number of GPRS territory downgrades made because of the increase

in the circuit switched traffic load.

Updated When the Radio Resource Management starts a GPRS territory

downgrade in order to maintain the margin of idle TCHs for circuit

switched traffic after a circuit switched channel allocation, or when the

BSC during TCH congestion in the CSW territory directly allocates a

TCH belonging to the GPRS territory.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

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Number 

Name

Release

001180

GPRS TER UG DUE DEC CSW TR

S9

Description Number of GPRS territory upgrades made to fulfill the default GPRS

territory as a consequence of decrease in the circuit switched traffic

load.

Updated When the Radio Resource Management starts a GPRS territory

upgrade in order to fulfill the defined default GPRS territory after the

traffic load in the BTS has decreased as a consequence of a circuit

switched channel release.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

Number 

Name

Release

001181

GPRS TER DOWNGRADE REQ

S9

Description Number of territory downgrade requests received from the Packet

Controller Unit.

Updated When the Radio Resource Management receives from the Packet

Controller Unit a request for a GPRS territory downgrade. The PCU

can request for a downgrade for GPRS RTSLs beyond the defaultterritory defined by the operator parameters. A GPRS territory

downgrade is initiated because of increase of CS load. PCU can

initiate GPRS resource downgrade to additional GPRS resources. For 

example, when PCU has previously requested GPRS territory

upgrade and additional channels has been given for GPRS use.

When there is no more need for additonal GPRS capacity PCU

requests for downgrade, the additional channels are removed from

GPRS territory and this counter is triggered.

Feature BSS9006 GPRS Telecom in BCSU and MCMU

Number 

Name

Release

001182

FULL TCH SEIZ INTRA AMR HO

S10

Description Number of successful FR TCH seizures for an intra-cell HO when the

channel rate changes and AMR speech codecs are in use.

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Number 

Name

Release

001182

FULL TCH SEIZ INTRA AMR HO

S10

Updated When the Radio Resource Management allocates a FR TCH for intra-

cell HO as a response to a TCH request and the channel rate is

changed from HR to FR and speech codec versions 3 are in use.

Dependencies with other 

counters/PI(s)

Counter 001116 is updated along with this counter.

Feature BSS10004 Adaptive Multi Rate Codec

Number 

Name

Release

001183

HALF TCH SEIZ INTRA AMR HO

S10

Description Number of successful HR TCH seizures for intra-cell HO when the

channel rate changes and AMR speech codecs are in use.

Updated When the Radio Resource Management allocates a HR TCH for  

intra-cell HO as a response to a TCH request and the channel rate is

changed from FR to HR and speech codec versions 3 are in use.

Dependencies with other 

counters/PI(s)

Counter 001117 is updated along with this counter.

Feature BSS10004 Adaptive Multi Rate Codec

Number 

Name

Release

001184

TCH CALL REQ FOR AMR

S10

Description Number of TCH requests for an AMR call.

Updated When the Radio Resource Management receives a TCH request in a

call setup or HO attempt and speech codec version 3 is the most

preferred one.

Dependencies with other 

counters/PI(s)

Counter 001026 is updated along with this counter.

Feature BSS10004 Adaptive Multi Rate Codec

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Number 

Name

Release

001185

SUCCESSFUL AMR CODEC SET DOWNGRADES

S10

Description Number of successful AMR codec set downgrades during internal

HOs for the source side AMR codec set. Downgrade is made to align

the source side AMR codec set with the one chosen for the target side

in order to utilize the one-way downlink speech path connection for 

the target side during the internal HO. The utilization of one-way

downlink speech path connection decreases the amount of muting

experienced in the speech path connection. Downgrade decision

during internal HO depends on the parameter AMR codec mode set

downgrades and upgrades enabled.

Updated By the Abis interface services after successful mode modifyprocedures for BTS and MS.

Feature BSS10004 Adaptive Multi Rate Codec

Number 

Name

Release

001186

UNSUCCESSFUL AMR CODEC SET DOWNGRADES

S10

Description Number of unsuccessful AMR codec set downgrades during internal

HOs for the source side AMR codec set. Alignment between thesource side AMR codec set and the one chosen for the target side

has failed and usage of one-way speech path downlink connection for 

the target side during the internal HO is not possible.

Updated By the Abis interface services after an unsuccessful mode modify

procedure for BTS or MS.

Feature BSS10004 Adaptive Multi Rate Codec

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Number 

Name

Release

001187

SUCCESSFUL AMR CODEC SET UPGRADES

S10

Description Number of successful AMR codec set upgrades after internal HOs for  

the target side AMR codec set. Upgrade is made to utilize the original

 AMR codec set of the target BTS which set was not chosen for the

target side because of target side alignment with the source side

during internal HO. This alignment is made in order to utilize the one-

way downlink speech path connection for the target side during the

internal HO. The utilization of one-way speech path downlink

connection decreases the amount of muting experienced in the

speech path connection. Upgrade decision after internal HO depends

on the parameters AMR codec mode set downgrades and upgrades

enabled and AMR multirate configuration in handovers.

Updated By the Abis interface services after successful mode modify

procedures for BTS and MS.

Feature BSS10004 Adaptive Multi Rate Codec

Number 

Name

Release

001188

UNSUCCESSFUL AMR CODEC SET UPGRADES

S10

Description Number of unsuccessful AMR codec set upgrades after internal HOs

for the target side AMR codec set. The target side continues to use

the currently used AMR codec set.

Updated By the Abis interface services after an unsuccessful mode modify

procedure for BTS or MS.

Feature BSS10004 Adaptive Multi Rate Codec

Number 

Name

Release

001189

TCH REQ FOR 96 DAT CALL

S10

Description Number of TCH requests for 9.6 kbit/s data call.

Updated When the Radio Resource Management receives a TCH request for a

single slot 9.6kbit/s data connection in a call or a handover attempt.

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Number 

Name

Release

001190

SUCC TCH SEIZ FOR 96 DAT CALL

S10

Description Number of successful TCH seizures for 9.6 kbit/s data call.

Updated When the Radio Resource Management allocates a TCH/F as a

response to a single slot 9.6kbit/s request in a call or handover 

attempt.

Number 

Name

Release

Definition updated

001191

SPARE001191

S10.5 ED

S11

Description Spare

Number 

Name

Release

Definition updated

001192

SPARE001192

S10.5 ED

S11

Description Spare

Number 

Name

Release

Definition updated

001193

SPARE001193

S10.5 ED

S11

Description Spare

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Number 

NameRelease

Definition updated

001194

TCH ACCESS REJECTED DUE LOW RXS10.5 ED

S11.5

Description Number of unsuccessful call setup attempts because of a too low RX

level.

Updated RRM updates the counter if a call setup fails because of a too low RX

level.

Number 

Name

Release

001195

MSC O HO CMD

S11

Description Number of handover commands sent by BSC in an outgoing MSC-

controlled handover (SDCCH-SDCCH, TCH-TCH or SDCCH-TCH

HO)

Logical type Cumulative

Number 

Name

Release

001196

BSC O HO CMD ASSGN

S11

Description Number of all handover commands or assignment commands sent by

BSC in an outgoing BSC-controlled handover (SDCCH-SDCCH, TCH-

TCH or SDCCH-TCH HO).

Logical type Cumulative

Number 

Name

Release

001197

BTS HO ASSGN

S11

Description Number of assignment commands sent in intra-BTS handovers

(SDCCH-SDCCH, TCH-TCH or SDCCH-TCH).

Logical type Cumulative

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Number 

NameRelease

001198

TCH REL DUE TO RADIO FAIL PH 9-11S11

Description Number of TCH releases because of radio failures, updated in phases

9-11 only (Outgoing handovers before CONNECT_ACK ). Same DX

causes as in counter 001139.

Logical type Cumulative

Number 

Name

Release

001199

TCH REL DUE TO BSS FAIL PH 2-3

S11

Description Number of TCH releases because of BSS failures, updated in phases

2-3 only. Same DX causes as in counter 001140.

Logical type Cumulative

Number 

Name

Release

001200

TCH REL DUE TO BSS FAIL PH 9-11

S11

Description Number of TCH releases because of BSS failures, updated in phases

9-11 only (Outgoing handovers before connect_ack). Same DX causes

as in counter 001140.

Logical type Cumulative

Number 

Name

Release

001201

SDCCH FAIL PH 3

S11

Description Number of all the failures on SDCCH in phase 3 that do not trigger any

TCH failure counter in the same phase.

Logical type Cumulative

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Number 

NameRelease

001202

DROP AFTER TCH ASSIGNS11

Description Number of dropped calls after the TCH is assigned.

Updated When the drop occurs between ASSIGNMENT_COMPLETE and

DISCONNECT .

Logical type Cumulative

Number 

Name

Release

001203

ERROR IND DURING LU

S11

Description Number of Error indication messages received during the Location

Update procedure.

Logical type Cumulative

Number 

Name

Release

001204

DROP TCH ASSCOMPL TO RFCH REL

S11.5

Description Number of TCH drops between the Assignment Complete and the RF

Channel Release messages.

Updated When the TCH transaction ends in a phase between the Assignment

Complete and the RF Channel Release messages.

Dependencies with other 

counters

Some of the counters 001013, 001014, 001029, 001030, 001046,

001047, 001048, 001049, 001050, 001051, 001070, 001081, 001084,

001085, 001087, 001088, and 001202 may be updated together with

this counter.

Number 

Name

Release

001205

TCH REL DUE RAD FAIL PH 2-3

S11.5

Description Number of the TCH releases because of the radio failures, updated in

phases 2-3 only . Same DX causes as in the counter 001139.

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Number 

Name

Release

001205

TCH REL DUE RAD FAIL PH 2-3

S11.5Updated When the TCH is released in call phase 2 (MM signalling) or 3 (Basic

assignment) because of a radio failure.

Dependencies with other 

counters

Counter 001139 is updated together with this counter.

Number 

Name

Release

001206

TCH REL DUE RAD FAIL PH 12-14

S11.5

Description Number of the TCH releases because of radio failures, updated in

phases 12-14 only . Same DX causes as in the counter 001139.

Updated When the TCH is released during the Handover phases (12-14)

because of a radio failure.

Dependencies with other 

counters

Counter 001139 is updated together with this counter.

Number Name

Release

001207TCH REL DUE BSS FAIL PH 12-14

S11.5

Description Number of the TCH releases because of the BSS failures, updated in

phases 12-14 only. Same DX causes as in the counter 001140.

Updated When the TCH is released during the Handover phases (12-14)

because of a BSS failure.

Dependencies with other 

counters

Counter 001140 is updated together with this counter.

Number 

Name

Release

001208

A IF CRC MISMATCH CALL SETUP

S11.5

Description Number of the TCH requests rejected because of the mismatch

between the types of the requested channel and the A interface circuit,

updated in call setup phase only.

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Number 

Name

Release

001208

A IF CRC MISMATCH CALL SETUP

S11.5Updated When the RRM changes the A interface circuit pool before the TCH

allocation.

Dependencies with other 

counters

Counter 001122 is updated together with this counter 

Number 

Name

Release

001209

GPRS TER DG REJ DUE STREAMING

S11.5

Description Number of the territory downgrade permission requests that have been

rejected because of the streaming traffic.

Updated Whenthe PCU rejects the downgrade permission request.

Feature BSS11111 Enhanced Quality of Service

Number 

Name

Release

001210

GPRS TER DG REQ WHEN EQOS ON

S11.5

Description Number of the PS downgrade permission requests because of the CS

resources.

Updated The BSC updates the counter when a downgrade request is sent to the

PCU.

Feature BSS11111 Enhanced Quality of Service

Number 

Name

Release

001211

TCH REL BSC BSC CONFLICT CALL

S11.5

Description Number of TCH releases because of a BSC-BSC conflict.

Updated When a TCH is released (with cause bc_t_bsc_bsc_conflict_c in

phases 1-8 or 15)

Feature BSS11052 Dynamic Frequency and Channel Allocation

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Number 

NameRelease

001212

TCH REL BSC BSC CONFLICT TARGS11.5

Description Number of TCH releases because of a BSC-BSC conflict.

Updated When a TCH is released (with cause bc_t_bsc_bsc_conflict_c in

phases 12-14)

Feature BSS11052 Dynamic Frequency and Channel Allocation

Number 

Name

Release

001213

GPRS TER UG REQ FROM CSW 

S11.5

Description Number of territory upgrade requests to PCU initiated by the CSW.

Updated When the RRM initiates a PSW territory upgrade to the PCU.

Dependencies with other 

counters

001214 and 001215

Feature BSS1109672 Dynamic Abis Enhancement

Number 

Name

Release

001214

GPRS TER UG FROM CSW PARTIAL

S11.5

Description Number of territory upgrade requests from the CSW RRM to the PCU

that have been served with less radio time slots than requested, i.e.

partially successful PSW territory upgrade in the PCU.

Updated When the PCU upgrades the GPRS territory with less RTSLs than the

RRM requested for.

Dependencies with other 

counters

001213

Feature BSS1109672 Dynamic Abis Enhancement

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Number 

NameRelease

001215

GPRS TER UG FROM CSW FAILEDS11.5

Description Number of territory upgrade requests from the CSW RRM to the PCU

where the upgrade of the single new radio time slots to the PCU was

not successful.

Updated When the PCU rejects the whole PSW territory upgrade, i.e. no single

new RTSL was upgraded to the PCU.

Dependencies with other 

counters

001213

Feature BSS1109672 Dynamic Abis Enhancement

Number 

Name

Release

001216

SPARE001216

S11.5

Description Spare

Number 

Name

Release

001217

SPARE001217

S11.5

Description Spare

Number 

Name

Release

001218

SPARE001218

S11.5

Description Spare

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Number 

NameRelease

001219

SPARE001219S11.5

Description Spare

Number 

Name

Release

001220

SPARE001220

S11.5

Description Spare

Number 

Name

Release

001221

SPARE001221

S11.5

Description Spare

Number Name

Release

001222SPARE001222

S11.5

Description Spare

Number 

Name

Release

001223

SPARE001223

S11.5

Description Spare

Number 

Name

Release

001224

SPARE001224

S11.5

Description Spare

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Number 

NameRelease

001225

SPARE001225S11.5

Description Spare

Number 

Name

Release

001226

SPARE001226

S11.5

Description Spare

Number 

Name

Release

001227

SPARE001227

S11.5

Description Spare

Number Name

Release

001228SPARE001228

S11.5

Description Spare

Number 

Name

Release

001229

SPARE001229

S11.5

Description Spare

Number 

Name

Release

001230

SPARE001230

S11.5

Description Spare

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Related topics

1 Traffic Measurement 

Signalling Charts of Traffic Measurement 

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3 Signalling charts of Traffic Measurement

The following figures show the signalling charts of Traffic Measurement:

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Figure 1. Basic call without counters.

Immediate assign command

BSC:MS: BTS: MSC:

PagingPaging commandPaging request

Radio access part on CCCH

Paging part

Channel request Channel required

Channel activationChannel activation ack

Immediate assign

DDCH establishment part

Sabm Establish indication Paging response

Ciphering mode complete

SDCCH signalling part

SetupSetupCall proceeding Call proceeding

Assignment requestPhysical context requestPhysical context confirm

Channel activationChannel activation ack

Assignment command

TCH seized, FACCH signalling part

Ua

Sabm Establish indicationUa

Assignment complete Assignment completeRf channel release

Rf channel release ackAlert AlertConnect Connect

Connect ackConnect ack

Conversation phase

Release completeClear command

Clear completeChannel releaseDeactivate SACCH

DiscUa Release indication

Rf channel releaseRf channel release ack

Release by MS

Disconnect DisconnectReleaseRelease

Release complete

Authentification requestAuthentification requestAuthentification response Authentification response

Identification requestIdentification requestIdentification response Identification response

Ciphering mode commandEncryption commandCiphering mode commandCiphering mode complete

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Figure 2. Basic call with counters.

BTS: MSC:MS: BSC:

TCH succ req in norm assign 001009

Radio access part on CCCH

Paging part

Channel request Channel required

Channel activation

Physical context confirm

Channel activation

Basic call signalling continuos, see figure 1

Basic call signalling, see figure 1

SDCCH seiz att for MOCor SDCCH seiz att for MTC

001135

001136

FR TCH succ seiz for norm assignor HR TCH succ seiz for norm assign

001114

001115

FR TCH succ seizor HR TCH succ seiz

001106

001107

SDCCH attempts 001000

SDCCH succ seiz for imm assign 001007

TCH requests 001010

TCH req for norm assign 001026

Ass req, que allowor Ass req, que not allow

001056

001057

001137

001138

TCH seiz att for MOCor TCH seiz att for MTC

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor HR pref TCH requests

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Figure 3. Basic call with priority subscriber.

BTS: MSC:BSC:

TCH req for norm assign 001026

TCH requests 001010

Physical context confirm

Channel activation

Basic call signalling continuos, see figure 1

Basic call signalling, see figure 1

001054

001055

Ass req that can cause forced relor Ass req that can cause forced HO

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor HR pref TCH requests

TCH req with prior subscriber  001095

001137

001138

FR TCH succ seizor HR TCH succ seiz

001106

001107

FR TCH succ seiz for norm assignor HR TCH succ seiz for norm assign

001114

001115

TCH seiz att for MOCor TCH seiz att for MTC

TCH succ req in norm assign 001009

Succ TCH req with prior subscriber  001096

MS:

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Figure 4. FACCH call setup due to SDCCH congestion without counters.

BSC:MS: MSC:BTS:

Mode modify request

Channel request Channel required

Channel activation

Channel activation ack

Immediate assign command

Immediate assign

SetupSetup

Call proceeding Call proceeding

Assignment request

Mode modify ack

Channel mode modification

Channel mode modification ack

Assignment complete

Alert Alert

Connect Connect

Connect ackConnect ack

Channel mode modification

Channel mode modification ack

Conversation phase

Release by MS

DDCH establishment part

TCH, FACCH signalling part

Radio access part on CCCH

Paging part

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Figure 5. FACCH call setup due to SDCCH congestion with counters.

BTS: MSC:MS: BSC:

Unsucc imm ass SDCCH attempt 001155

SDCCH attempts 001000

TCH request 001010

Succ TCH seiz due SDCCH cong 001099

001044

Att to seize TCH due SDCCH cong 001098

TCH req for FACCH call set-up 001043

Seiz att with busy SDCCH 001001

Radio access part on CCCH

Paging part

Channel request Channel required

Channel activation

FACCH call set-up signalling, see figure 4

Succ FR TCH seiz in FACCH callset-upor Succ HR TCH seiz in FACCH callset-up

001125

001126

001135

001136

SDCCH seiz att for MOCor 

SDCCH seiz att for MTC

001123

001124

001137

001138

Succ TCH seiz in FACCH callset-up

TCH seiz att for MOCor 

TCH seiz att for MTC

FR TCH req for FACCH call set-upor TCH req for FACCH call set-up, chrt not def 

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Figure 6. FACCH call setup due to SDCCH congestion, no free TCH channel.

Optional software directed retry is not activated.

BSC:

Unsucc imm ass SDCCH attempt 001155

TCH request rejected due to cong 001141

Att to seize TCH due SDCCH cong 001098

TCH req for FACCH call set-up 001043

TCH requests 001010

Seiz att with busy SDCCH 001001

SDCCH attempts 001000

MS: MSC:BTS:

Immediate assignment reject

Channel required

Radio access part on CCCH

Paging part

Channel request

No free TCH

001135

001136

SDCCH seiz att for MOCor 

SDCCH seiz att for MTC

001123

001124

FR TCH req for FACCH call set-upor TCH req for FACCH call, ch rate notdef 

001137

001138

TCH seiz att for MOC

or TCH seiz att for MTC

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

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Figure 7. Normal release.

Radio access part on CCCH

Paging part

DDCH establishment part

TCH seized, FACCH signalling part

Conversation phase

Release by MS

Disconnect DisconnectReleaseRelease

Release complete Release complete

Clear command

Channel release

Deactive sacch

Disc

Ua

Release indication

Rf channel rel

Rf channel rel ack

Clear complete

SDCCH signalling part

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

BSC:MS: MSC:BTS:

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Figure 8. Basic call, no free TCH and queuing or directed retry is not allowed.

BSC:

Ass req, queuing not allow 001057

TCH req for norm assign 001026

TCH requests 001010

Rej ass req, que not allow 001061

TCH req rej due to lack 001011

TCH req rej due to cong 001141

MS: MSC:BTS:

Assignment failure

Rf channel release

Rf channel release ack

Clear command

Channel release

Deactive sacchDisc

UaRelease indication

Clear complete

Physical context confirm

Basic call signalling, see figure 1

No free TCH and queueing or DR not allowed

TCH seiz att for MOCor TCH seiz att for MTC

001137

001138

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor 

HR pref TCH requests

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

FR TCH req rej due to lackor HR TCH req rej due to lack

001118

001119

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Figure 9. Successful TCH queuing.

BTS: MSC:MS: BSC:

Queue denominator 2 001021

Ave queue time of call attempt 001020

TCH succ req in norm assign 001009

Ass req, queuing allowed 001056

TCH req for norm assign 001026

TCH requests 001010

Call att set in queue for TCH 001016

Queuing indication

Rf channel release

Rf channel release ack

Basic call signalling, see figure 1

TCH channel is released, request is taken from queue

Physical context confirm

Channel activation

Basic call signalling, see figure 1

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor HR pref TCH requests

TCH seiz att for MOCor TCH seiz att for MTC

001137

001138

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

FR TCH succ seizor HR TCH succ seiz

001106

001107

FR TCH succ seiz for norm assignor HR TCH succ seiz for norm assign

001114

001115

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Figure 10. Basic call, no free TCHs, unsuccessful queuing and directed retry

not activated.

BSC:

001020

Call att in queue not served 001024

TCH req rej due to cong 001141

MS: MSC:BTS:

Assignment failure

Rf channel release

Rf channel release ack

Clear command

Channel release

Deactive sacchDisc

UaRelease indication

Clear complete

Physical context confirmBasic call signalling, see figure 1

No TCH released in time

001118

001119

FR TCH req rej due to lackor HR TCH req rej due to lack

Rej ass req, que allowed 001060

Call att set in queue for TCH 001016

TCH req rej due to lack 001011

Queuing indication

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

No free TCH, call is set in queue

Ass req, queuing allowed 001056

TCH seiz att for MOC

or TCH seiz att for MTC

001137

001138

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor HR pref TCH requests

TCH requests 001010

TCH req for norm assign 001026

Queue denominator 2 001021

Ave queue time of call attempt

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Figure 11. TCH assignment failure with cause switch_circuit_pool  , queuing

and directed retry not allowed.

BTS: MSC:MS: BSC:

Ass req, que not allowed 001057

TCH requests 001010

Assignment failure

Clear command

Channel release

Deactive SACCH

Disc

Ua

Release indication

Rf channel release

Rf channel release ack

Physical context confirm

Clear complete

Basic call signalling, see figure 1

TCH req for norm assign 001026

001104

001105

FR pref TCH requestsor 

HR pref TCH requests

001137

001138TCH seiz att for MOCor 

TCH seiz att for MTC

TCH req rej due to lack 001011

Rej ass req, que not allow 001061

001118

001119

FR TCH req rej due to lackor HR TCH req rej due to lack

TCH req rej due change crct pool 001122

TCH req rej due to cong 001141

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Figure 12. Unsuccessful TCH activation.

BTS: MSC:MS: BSC:

Assignment failure

Clear command

Channel release

Deactive SACCH

Disc

Ua

Release indication

Clear complete

Basic call signalling, see figure 1

TCH activation fail 001028

SDCCH Rf channel rel

SDCCH Rf channel rel ack

Rf channel rel ack

Physical context request

Assignment request

Physical context confirm

Channel activation

Channel activation nack

Rf channel rel

Failure

TCH transact end due ch act fail 001081

001133

001134

FR TCH transactions failor HR TCH transactions fail

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

001108

001109

001110

001111

001112

001113

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Figure 13. Unsuccessful TCH activation, timer expires while waiting for 

CHANNEL_ACTIVATION_ACK message.

MSC:BSC:BTS:MS:

TCH rel due BSS fail 001140

TCH transact end due BSS probl 001012

Start timer T9103

SDCCH Rf channel rel

SDCCH Rf channel rel ack

Rf channel rel ack

Assignment failure

Clear command

Channel release

Deactive SACCHDisc

UaRelease indication

Clear complete

Physical context request

Assignment request

Physical context confirm

Channel activation

Rf channel rel

Basic call signalling, see figure 1

TCH transact end due Abis fail 001045

TCH transact end due Abis fail 001084

001133

001134

FR TCH transactions failor HR TCH transactions fail

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or 

HR TCH speech HR ver 3

Timer T9103 expires

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Figure 14. TCH assignment failure.

MSC:BSC:BTS:MS:

SDCCH Rf channel rel

SDCCH Rf channel rel ack

Assignment failure

Clear command

Channel release

Deactive SACCHDisc

UaRelease indication

Clear complete

Failure

TCH Rf channel rel ack

Assignment request

Assignment command

Assignment failure

TCH Rf channel release

Physical context request

Physical context confirm

Channel activation

Channel activation ack

Basic call signalling, see figure 1

SDCCH trans end due radio fail 001003

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

001133

001134

FR TCH transactions fail

or HR TCH transactions fail

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Figure 15. TCH assignment failure, MSC sends CLEAR_COMMAND message.

MSC:BSC:BTS:MS:

SDCCH Rf channel relSDCCH Rf channel rel ack

TCH Rf channel rel ack

Radio access part on CCCH

Paging part

TCH seized, FACCH signalling part

Sabm

Disc

DDCH establishment part

Ua

Channel release

Release indication

TCH Rf channel release

Establish indicationClear command

Clear complete

Deactive SACCH

SDCCH signalling part

TCH transact end due BSS probl 001012

TCH transact end due A int fail 001051

TCH transact end due A int fail 001087

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or 

HR TCH speech HR ver 2or HR TCH speech HR ver 3

001133

00113

FR TCH transactions failor HR TCH transactions fail

TCH rel due BSS fail 001140

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Figure 16. CONNECTION_FAILURE message with cause transcoder_failure 

during a call.

MSC:BSC:BTS:MS:

Failure

TCH transact end due transc fail 001029

Rf channel rel ack

Conversation phase

Clear request

Disc

Ua

Channel release

Release indication

Rf channel release

Connection failure

Clear command

Clear complete

Deactive SACCH

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

001127

001128

001129

001130

001131

001132

TCH transc fail FR speech ver 1or TCH transc fail FR speech ver 2or TCH transc fail FR speech ver 3or TCH transc fail HR speech ver 1or TCH transc fail HR speech ver 2or TCH transc fail HR speech ver 3

001133

001134

FR TCH transactions failor HR TCH transactions fail

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Figure 17. TRX or TSL is blocked with different causes during a call.

MSC:BSC:BTS:MS:

TCH transact end due LAPD fail 001046

TCH transact end due Abis fail 001045

TCH transact end due BSS probl 001012

TRX / TSL is blocked

Clear complete

Rf channel rel ack

Conversation phase

Clear request

Disc

Ua

Channel release

Rf channel release

Clear command

Deactive SACCH

TCH transact end due BTS fail 001047

TCH transact end due USER act 001048

TCH transact end due NETW act 001050

TCH transact end due Abis int fail 001084

001133

001134

FR TCH transactions fail

or HR TCH transactions fail

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

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Figure TRX or TSL is blocked with different causes during a call  : Counters

updated with cause LAPD_failure: 001012 and 001046. Counters updated with

cause BTS_failure: 001012 and 001047. Counter 001048 is updated with cause

USER_actions. Counter 001050 is updated with cause NETW_actions. Counters

updated with cause ABIS_failure: 001012, 001045 and 001084. Counter 001108,

001109, 001110, 001111, 001112 or 001113 and counter 001133 or 001134 are

always updated with these causes.

Figure 18. SDCCH congestion, FACCH call setup is not activated.

BSC:

Unsucc imm ass SDCCH att

001155

SDCCH seiz att for MOC

001135 or 

SDCCH seiz att for MTC

001136

SDCCH attempts

001000

Seiz att with busy SDCCH

001001

MS: MSC:BTS:

Immediate assignment reject

Channel required

Channel request

Paging part

Radio access part on CCCH

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Figure 20. Unsuccessful SDCCH activation, timer expires while waiting for 

CHANNEL_ACTIVATION_ACK message.

MSC:BSC:BTS:MS:

SDCCH transact end dueBSS fail

Start timer T9103

Channel request

Channel required

Channel activation

Paging part

Rf channel release

Rf channel release ack

Immediate assignment reject

Radio access part on CCCH

Timer T9103 expires

SDCCH transact end duefail in Abis int

SDCCH transact end due fail in Abis intduring a call

001002

001033

001075

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Figure 21. Connection failure during SDCCH assignment.

BTS:

Failure

MSC:MS: BSC:

SDCCH transact ended due radio fail

001003

Channel request Channel required

Channel activation

Channel activation ack

Immediate assign command

Immediate assign

Connection failure

Channel release

Deactive SACCHDisc

Ua

Release indication

Rf channel release

Rf channel release ack

Radio access part on CCCH

Paging part

DDCH establishment part

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Figure 22. SDCCH assignment failure.

BTS: MSC:MS: BSC:

SDCCH transact end due fail in A -int

during a call001078

SDCCH transact end due fail in A -int001034

SDCCH transact end due BSS fail

001002

Failure

Assignment request

Channel release

Deactive SACCHDisc

Ua

Release indication

Rf channel release

Rf channel release ack

Assignment failure

Clear command

Clear complete

Basic call signalling, see figure 1

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Figure 23. Unsuccessful SDCCH activation, timer expires while waiting for 

PHYSICAL_CONTEXT_CONFIRM message.

MSC:BSC:BTS:MS:

SDCCH transact end dueBSS fail

SDCCH transact end duefail in Abis int

SDCCH transact end due fail in Abis intduring a call

001002

001033

001075

Timer T9108 expires

Start timer T9108

Assignment request

Physical context request

Assignment failure

Basic call signalling, see figure 1

Clear command

Rf channel release

Rf channel release ack

Channel release

Deactive SACCHDisc

UaRelease indication

Clear complete

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Figure 24. TRX/TSL is blocked with different causes during an SDCCH channel

activation.

Figure TRX/TSL is blocked with different causes during an SDCCH channel 

activation : Counters updated with cause LAPD_failure  : 001002 and 001035.

Counters updated with cause BTS_failure : 001002 and 001036. Counter 001037

is updated with cause USER_actions . Counter 001039 is updated with cause

NETW_actions . Counters updated with cause ABIS_failure  : 001002, 001033

and 001075.

MSC:BSC:BTS:MS:

SDCCH transact end due

BSS fail

SDCCH transact end duefail in Abis int

001002

001033

TRX / TSL is blocked

Channel requestChannel required

Channel activation

Paging part

Rf channel release

Rf channel release ack

Immediate assignment reject

SDCCH transaction end dueLAPD fail 001035

SDCCH transact ended dueBTS fail 001036

SDCCH transact end dueuser actions 001037

SDCCH transact end duenetw act fail 001039

SDCCH transact end due fail in Abis intduring a call 001075

Radio access part on CCCH

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Figure 25. Successful trunk reservation. Counters updated: 001040, 001041

and basic call counters, see Figure 2.

BSC:

Succ trunk reservations

001041

Trunk reservations

001040

MS: MSC:BTS:

Physical context request

Assignment request

Physical context confirm

Channel activation

Channel activation ack

Assignment command

Basic call signalling, see figure 1

Basic call signalling, see figure 1

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Figure 26. Unsuccessful trunk reservation.

MSC:BSC:BTS:MS:

TCH req for norm assign 001026

TCH requests 001010

Trunk reservations 001040

Assignment failure

Rf channel release

Rf channel release ack

Basic call signalling, see figure 1

Clear command

Channel release

Deactive sacchDisc

UaRelease indication

Clear complete

Physical context confirm

001056

001057

Ass req, que allowor 

Ass req, que not allow

001102

001103

001104

001105

FR TCH requestsor 

HR TCH requests

or FR pref TCH requestsor HR pref TCH requests

001137

001138

TCH seiz att for MOCor 

TCH seiz att for MTC

Unsuccessful trunk reservation

Refus TCH req of non-prior subsc 001097

Refused trunk reservations 001042

001100

001101

FR TCH req for trunk reserv rejor HR TCH req for trunk reserv rej

001060

001061

Rej ass req, queueing allowedor Rej ass req, queueing not allowed

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

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Figure 27. Successful internal intra-cell handover. Counters 001090 and

001091 are updated only with underlay overlay handover.

MSC:BSC:BTS:MS:

TCH requests 001010

Meas report Meas result

Physical context requestPhysical context confirm

HO measurement, Old TCH channel

Channel activation

Channel activation ack

Assignment commandAssignment command

Sabm Establish indication

Ua

Rr  HO performed

Rf channel releaseRf channel release ack

Assignment completeAssignment complete

001137

001138

TCH seiz att for MOCor TCH seiz att for MTC

001064

001065

Att to req HO, que allowedor Att to req HO, que not allowed

001102 or 001103 or 001104 or 001105

FR TCH requestsHR TCH requestsFR pref TCH requestsHR pref TCH requests

TCH req for underlay/overlay HO 001090

Succ TCH req for HO 001008

TCH seiz for underlay/overlay HO 001091

001106 or 001107

FR TCH succ seizHR TCH succ seiz

Succ seiz of FR TCH in int HOwith ch rate changesor 

Succ seiz of HR TCH in int HOwith ch rate changes

001116

001117

Old TCH channel release

Signalling on new TCH channel

Signalling on old TCH channel

New TCH channel reservation and activation

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Figure 28. Internal intra-cell HO, successful TCH queuing.

MSC:BSC:BTS:MS:

TCH requests 001010

Meas report Meas resultPhysical context request

Physical context confirm

Channel activation

Rf channel releaseRf channel release ack

001102 or 001103 or 

001104 or 001105

FR TCH requestsHR TCH requests

FR pref TCH requestsHR pref TCH requests

TCH req for underlay/overlay HO 001090

001106 or 001107

FR TCH succ seizHR TCH succ seiz

New TCH channel reservation and activation

HO measurement, Old TCH channel

Att to req HO, que allowed 001064

No free TCH, request is set in queue

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

TCH channel is released, request is taken from queue

HO signalling, see figure 27

001137 or 001138

TCH seiz att for MOCTCH seiz att for MTC

HO att set in queue for TCH 001017

Queued urgent HO attempt 001142

001023

001022

Queue denominator 3

Ave queue time of ho attempt

001143

001145

Ave queue time of urgent ho attor Ave queue time of non urgent ho att

Queue denominator 4Queue denominator 4

001144 or 001146

Succ TCH req for HO 001008

TCH seiz for underlay/overlay HO 001091

Succ FR TCH int HO with ch rt chor Succ HR TCH int HO with ch rt ch

001116

001117

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Figure Internal intra-cell HO, successful TCH queuing  : Counters 001090 and

001091 are updated only with underlay overlay HO. Counters 001142, 001143

and 001144 are updated only if the HO is started by cause urgent_handover .

001145 and 001146 are updated only if the HO is started by cause

non_urgent_handover .

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Figure 29. Unsuccessful internal intra-cell handover, timer expires while waiting

for CHANNEL_ACTIVATION_ACK message.

MSC:BSC:BTS:MS:

TCH transact end due BSS probl 001012

Start timer T9103

Timer T9103 expires

Meas report Meas result

Physical context request

Physical context confirm

Channel activation

Call going on the TCH channel

Rf channel release

Rf channel release ack

HO measurement, HO decision

New TCH channel reservation and activation

Normal HO counters updated, see figure 27

TCH transact end due Abis fail 001045

TCH transact end due Abis intfail on target channel

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

FR TCH transactions failor HR TCH transactions fail

001133

001134

Call continuous on the old TCH channel

001086

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Figure 30. Unsuccessful internal intra-cell handover, CONNECTION_FAILURE

message with cause remote_transcoder_failure  comes to the target

channel.

MSC:BSC:BTS:MS:

Meas report Meas result

Physical context requestPhysical context confirm

Channel activation

Call going on the TCH channelHO measurement, HO decision

New TCH channel reservation and activation

TCH transact end due transcfail on target

FR TCH transactions failor 

HR TCH transactions fail

001133

001134

001031

Channel activation ack

Call continuous on the old TCH channel

Signalling on FACCH TCH (old channel)

Assignment command

Connection failure

Assignment command

Rf channel release

Rf channel release ack

HO failure HO failure

Signalling on FACCH TCH (new channel), channel release

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

001127

001128

001129

001130

001131

001132

TCH transc fail FR speech ver 1or TCH transc fail FR speech ver 2or TCH transc fail FR speech ver 3or TCH transc fail HR speech ver 1or TCH transc fail HR speech ver 2or TCH transc fail HR speech ver 3

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Figure 31. Unsuccessful internal intra-cell handover, timer expires on the

source channel, call cleared.

MSC:BSC:BTS:MS:

Meas report Meas resultPhysical context request

Physical context confirm

FR TCH transactions failHR TCH transactions fail

001133 or 001134

Start timer T3107

HO measurement, Old TCH channel

Channel activation

Channel activation ack

Assignment commandAssignment command

Sabm Establish indicationUa

Rf channel release

Rf channel release ack

Clear request

Clear command

Rf channel releaseRf channel release ack

Clear complete

New TCH channel reservation and activation

Normal HO counters updated, see figure 6

Signalling on old TCH channel

Signalling on new TCH channel

Signalling on old TCH channel

Timer T3107 expires

New channel release

001108 or 001109 or 001110 or 

001111 or 001112 or 001113

FR TCH speech FR ver 1FR TCH speech FR ver 2FR TCH speech FR ver 3

HR TCH speech HR ver 1HR TCH speech HR ver 2HR TCH speech HR ver 3

001133 or 001134

FR TCH transactions failHR TCH transactions fail

Old TCH channel release

TCH transact end due fail on source 001014

001108 or 001109 or 001110 or 001111 or 001112 or 

001113

FR TCH speech FR ver 1FR TCH speech FR ver 2FR TCH speech FR ver 3HR TCH speech HR ver 1HR TCH speech HR ver 2

HR TCH speech HR ver 3

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Figure 32. Unsuccessful underlay overlay internal intra-cell handover, queuing

not allowed.

BSC: MSC:BTS:MS:

Meas report Meas result

Physical context request

Physical context confirm

HO measurement, Old TCH channel

Call continuous on old channel

New TCH channel reservation and activation

No free TCH, queueing not allowed

TCH requests 001010

001137

001138

TCH seiz att for MOCor TCH seiz att for MTC

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor HR pref TCH requests

Att to req HO, que not allowed 001065

TCH req for underlay/overlay HO 001090

TCH req rej due to lack 001011

001118

001119

FR TCH req rej due to lackor HR TCH req rej due to lack

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

HO req fail, queueing not allowed 001069

TCH req for underlay/overlay HOrej due lack 001092

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Figure 33. Internal intra-cell handover, unsuccessful TCH queuing.

MSC:BSC:BTS:MS:

TCH requests 001010

Meas report Meas result

Physical context request

Physical context confirm

001102 or 

001103 or 001104 or 001105

FR TCH requests

HR TCH requestsFR pref TCH requestsHR pref TCH requests

New TCH channel reservation and activation

HO measurement, Old TCH channel

No free TCH, request is set in queue

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

001137 or 001138

TCH seiz att for MOCTCH seiz att for MTC

HO att set in queue for TCH 001017

Queued urgent HO attempt 001142

Queue denominator 3 001023Ave queue time of ho attempt 001022

Att to req HO, queueing allowed 001064

Call continous on old TCH channel

No suitable TCH released in time

TCH req rej due to lack 001011

HO att in queue not served 001025

HO req rej, queueing allowed 001068

001144 or 001146

Queue denominator 4Queue denominator 5

Queued urgent HO att not served 001147

001143

001145

Ave queue time of urgent ho attor 

Ave queue time of non urgent ho att

001118 or 001119

FR TCH req rej due to lackHR TCH req rej due to lack

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Figure Internal intra-cell handover, unsuccessful TCH queuing  : Counters

001142, 001143, 001144 and 001147 are updated only if the handover is started

  by cause urgent_handover . Counters 001145 and 001146 are updated only if the

handover is started by cause non_urgent_handover .

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Figure 35. Successful internal inter-cell handover.

MSC:BSC:BTS:MS:

Sabm Establish indication

Channel activation

Channel activation ack

HO commandHO command

HO access HO detection

Physical info

Ua

Rr  HO performed

Rf channel release

Rf channel release ack

HO complete HO complete

TCH requests 001010

Meas report Meas result

HO measurement, Old TCH channel in the old BTS

Signalling on the old TCH channel in the old BTS

Signalling on the new TCH channel in the new BTS

Old TCH channel release in the old BTS

New TCH channel reservation and activation in the new BTS

001137 or 001138

TCH seiz att for MOCTCH seiz att for MTC

001064 or 001065

Att to req HO, que allowedAtt to req HO, que not allowed

TCH req for underlay/overlay HO 001090

001102 or 

001103 or 001104 or 001105

FR TCH requestsHR TCH requestsFR pref TCH requestsHR pref TCH requests

Succ TCH req for HO 001008

TCH seiz for underlay/overlay HO 001091

001106 or 001107

FR TCH succ seizHR TCH succ seiz

Succ seiz of FR TCH in int HOwith ch rate changesSucc seiz of HR TCH in int HOwith ch rate changes

001116 or 

001117

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Figure Successful internal inter-cell handover  : Counters 001090 and 001091 are

updated only with underlay overlay handover.

Figure 36. Unsuccessful internal inter-cell handover.

MSC:BSC:BTS:MS:

Meas report Meas result

TCH activation fail 001028

HO measurement, Old TCH channel

Channel activation

Channel activation nack

New TCH channel reservation and activation in new BTS

Call continuous on the old channel

Rf channel releaseRf channel release ack

Normal HO counters updated, see figure 35

New channel release

TCH transact end due TCH actfail in target

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

001133

001134

FR TCH transactions failor HR TCH transactions fail

001083

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Figure 37. Successful external handover, target.

MSC:BSC:BTS:MS:

TCH requests 001010

HO request

Channel activation

Channel activation ack

HO request ack

HO access HO detection HO detection

Physical info

Sabm Establish indication

Ua

HO complete

Rr 

HO complete HO completed

001064

001065

Att to req HO, que allowedor Att to req HO, que not allowed

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor HR pref TCH requests

Succ TCH req for HO 001008

001106

001107

FR TCH succ seizor HR TCH succ seiz

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Figure 38. Successful external handover, source.

BTS: MSC:MS: BSC:

FR TCH speech FR ver 1

001108 or FR TCH speech FR ver 2

001109 or 

FR TCH speech FR ver 3001110 or 

HR TCH speech HR ver 1001111 or 

HR TCH speech HR ver 2001112 or 

HR TCH speech HR ver 3001113

HO command

Rf channel release

Rf channel release ack

HO requiredMeas report Meas result

Clear complete

HO commandHO command

Clear command

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Figure 39. Unsuccessful external handover, source BSC, timer expires while

waiting for CLEAR_COMMAND message.

MSC:BSC:BTS:MS:

Timer T8 expires

Start timer T8

TCH transact end due BSS probl 001012

Meas report Meas result HO required

HO command

HO measurement, HO decision

Call going on the TCH channel

Clear command

Rf channel release

Rf channel release ack

Clear request

HO commandHO command

Clear complete

Call cleared

TCH transact end due A int fail 001051

TCH transact end due A int failon source

001108

001109

001110

001111

001112

001113

FR TCH speech FR ver 1or FR TCH speech FR ver 2or FR TCH speech FR ver 3or HR TCH speech HR ver 1or HR TCH speech HR ver 2or HR TCH speech HR ver 3

001133

001134

FR TCH transactions failor HR TCH transactions fail

001088

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Figure 41. Successful traffic reason handover, source.

MSC:BSC:BTS:MS:

HO s due to traffic reasons 001052

Rf resource indication

Resource request

Resource indication

HO candidate enquiry

HO required

HO candidate response

HO commandHO commandHO command

Enquiries of traffic reason HO 001053

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Figure 42. Successful SDCCH internal intra-cell handover.

MSC:BSC:BTS:MS:

SDCCH attempts 001000

Meas report Meas result

Physical context request

Physical context confirm

HO measurement, Old SDCCH channel

Channel activation

Channel activation ack

Assignment command

Assignment command

Sabm Establish indication

Ua

Assignment completeRr  HO performed

Rf channel release

Rf channel release ack

New SDCCH channel reservation and activation

001135

001136

SDCCH seiz att for MOCor SDCCH seiz att for MTC

Succ SDCCH seiz for HO 001006

Signalling on old SDCCH channel

Signalling on new SDCCH channel

Old SDCCH channel release

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Figure 43. Unsuccessful SDCCH internal intra-cell handover, timer expires

while waiting for CHANNEL_ACTIVATION_ACK message.

MSC:BSC:BTS:MS:

Timer T9103 expires

Start timer T9103

Meas report Meas result

Physical context request

Physical context confirm

Channel activation

HO measurement, old SDCCH channel

Rf channel release

Rf channel release ack

New SDCCH channel reservation and activation

SDCCH transact end due BSSprobl

Signalling continuous on old SDCCH channel

SDCCH transact end due Abisint fail

SDCCH transact end due Abis int failon target

001002

001033

001077

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Figure 44. Unsuccessful SDCCH internal intra-cell handover, unsuccessful

channel activation.

BSC:

SDCCH transact end duech act fail on target

001074

SDCCH transact end duech act fail

001027

MS: MSC:BTS:

Meas report Meas result

Physical context request

Physical context confirm

Channel activation

Rf channel release

Rf channel release ack

Channel activation nack

HO measurement, old SDCCH channel

New SDCCH channel reservation and activation

Signalling continuous on old SDCCH channel

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Figure 45. Unsuccessful SDCCH internal intra-cell handover,

CONNECTION_FAILURE message comes to the target channel

during handover.

MSC:BSC:BTS:MS:

Meas report Meas result

Physical context request

Physical context confirm

HO measurement, Old SDCCH channel

Channel activation

Channel activation ack

Assignment command

Assignment command

Sabm Establish indication

UaConnection failure

Signalling continuous on old channel

Rf channel release

Rf channel release ack

New SDCCH channel reservation and activation

Signalling on old SDCCH channel

Signalling on new SDCCH channel

SDCCH transact end dueradio fail on target 001005

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Figure 46. Successful SDCCH internal inter-cell handover.

MSC:BSC:BTS:MS:

SDCCH attempts 001000

Succ SDCCH seiz for HO 001006

Meas report Meas result

Sabm Establish indication

HO measurement, Old SDCCH channel in old BTS

Channel activation

Channel activation ack

New SDCCH channel reserv. and activ. in new BTS

Signalling on the old SDCCH channel in the old BTS

HO commandHO command

Signalling on new SDCCH channel in new BTS

HO access HO detection

Physical info

Ua

Rr  HO performed

Old SDCCH channel release in the old BTS

Rf channel release

Rf channel release ack

HO complete HO complete

001135

001136

SDCCH seiz att for MOCor SDCCH seiz att for MTC

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Figure 47. Unsuccessful SDCCH internal inter-cell handover, BTS sends

CONNECTION_FAILURE message.

MSC:BSC:BTS:MS:

Meas report Meas result

Rf channel release

Rf channel release ack

HO measurement, Old SDCCH channel

Channel activation

Connection failure

New SDCCH channel reservation and activation

Signalling on old SDCCH channel

Signalling on new SDCCH channel

Rf channel release

Rf channel release ack

Clear request

Clear command

Clear complete

SDCCH transact end due radiofail on source 001004

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Figure 48. Successful SDCCH external handover target.

Figure 49. Successful SDCCH external handover source. No counters

updating.

MSC:BSC:BTS:MS:

SDCCH attempts 001000

HO request

Channel activation

Channel activation ack

HO request ack

HO access HO detection HO detection

Physical info

Sabm Establish indication

Ua

HO complete

Rr 

HO complete HO completed

Succ SDCCH seiz for HO 001006

BSC:MS: MSC:BTS:

HO command

Rf channel release

Rf channel release ack

HO required

Meas report Meas result

Clear complete

HO commandHO command

Clear command

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Figure 50. Unsuccessful SDCCH external handover, timer expires while waiting

for CLEAR_COMMAND message.

MSC:BSC:BTS:MS:

SDCCH transact end due A int fail 001034

SDCCH transact end due BSS fail 001002

Timer T8 expires

Start timer T8

HO command

Rf channel release

Rf channel release ack

HO requiredMeas report Meas result

Clear complete

HO commandHO command

Clear command

Clear request

Signalling on SDCCH source channel

Rf channel release ackRf channel release

Clear command

Clear complete

SDCCH transact end due A int failon source

Signalling on SDCCH target channel

SDCCH transact end due BSS fail 001002

SDCCH transact end due A int fail 001034

SDCCH transact end due A int failon target

001079

001080

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Figure 51. Successful forced release.

MSC:BSC:BTS:MS:

TCH requests 001010

Call going on TCH channel

Clear request

Clear command

Channel release

Deactive SACCHDisc

Ua Release indication

Rf channel release

Rf channel release ack

Clear complete

Channel activation

Physical context confirm

Queueing indication

New call coming with priority subscriber 

Basic call signalling, see figure 1

TCH req for norm assign 001026

Ass req that can cause forced rel 001054

001102 or 001103 or 001104 or 001105

FR TCH requestsHR TCH requestsFR pref TCH requestsHR pref TCH requests

TCH seiz att for MOCTCH seiz att for MTC

001137 or 001138

001120 or 001121

FR TCH req rej due HR trafficHR TCH req rej due FR traffic

No free TCH channel, call with lower priority is released

Released TCH channel is allocated for the priority call

Forced release 001070

TCH succ req in norm assign 001009

001106 or 001107

FR TCH succ seizHR TCH succ seiz

Signalling continuous like basic call, see figure 1

001114

001115

FR TCH succ seiz for norm assignor HR TCH succ seiz for norm assign

001108 or 001109 or 001110 or 001111 or 001112 or 001113

FR TCH speech FR ver 1FR TCH speech FR ver 2FR TCH speech FR ver 3HR TCH speech HR ver 1HR TCH speech HR ver 2HR TCH speech HR ver 3

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Figure 52. Unsuccessful forced release.

MSC:BSC:BTS:MS:

TCH requests 001010

Clear command

Channel release

Deactive SACCHDisc

UaRelease indication

Rf channel release

Rf channel release ack

Clear complete

Physical context confirm

Queueing indication

New call coming with priority subscriber 

Basic call signalling, see figure 1

TCH req for norm assign 001026

Ass req that can cause forced rel 001054

001102 or 001103 or 

001104 or 001105

FR TCH requestsHR TCH requests

FR pref TCH requestsHR pref TCH requests

T CH s eiz at t f or M OC

TCH seiz att for MTC001137 or 

001138

001120 or 001121

FR TCH req rej due HR trafficHR TCH req rej due FR traffic

No free TCH channel

Assignment failure

No suitable TCH for release, forced release timer expires

TCH req with prior subscriber 001095

FR TCH req rej due to lackHR TCH req rej due to lack

001118 or 001119

Forced rel req rej 001058

TCH req rej due to lack 001011

TCH req rej due to cong 001141

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Figure 53. Unsuccessful forced release with external handover.

MSC:BSC:BTS:MS:

TCH requests 001010

Meas report Meas result HO required

HO request

Queuing indication

Priority call going on the TCH channel

Clear command

Rf channel release

Rf channel release ack

HO failure

Clear complete

HO measurement, HO decision

New TCH channel reservation and activation in new BSC

Att to req HO with forced rel 001062

TCH req with prior subscriber  001095

001102

001103

001104

001105

FR TCH requestsor HR TCH requestsor FR pref TCH requestsor HR pref TCH requests

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

No suitable TCH for forced release, forced release timer exp ires

001119

FR TCH req rej due to lackor HR TCH req rej due to lack

TCH req rej due to lack 001011

HO req rej with forced release 001066

Call continuous on the old channel

001118

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Figure 54. Successful forced handover.

MSC:BSC:BTS:MS:

TCH req for norm assign 001026

TCH requests 001010

Ass req that can cause forced HO 001055

New call coming with priority subscriber 

Call going on the TCH channel

Channel activation

Physical context confirm

No free TCH channel, call with lower priority is forced HO

Queueing indication

001102

001103

001104

001105

FR TCH requestsor 

HR TCH requestsor 

FR pref TCH requestsor 

HR pref TCH requests

001137

001138

TCH seiz att for MOCor 

TCH seiz att for MTC

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

Normal internal inter cell HO, see figure 35

Released TCH channel is allocated for the priority call

TCH succ req in norm assign 001009

Forced HO 001071

001106

001107

FR TCH succ seizor 

HR TCH succ seiz

001114

001115

FR TCH succ seiz for norm assignor 

HR TCH succ seiz for norm assign

Signalling continuous like basic call, see figure 1

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Figure 55. Unsuccessful forced handover.

MSC:BSC:BTS:MS:

TCH req rej due to lack 001011

TCH requests 001010

New call coming with

Calls going on the TCH channel

Clear complete

Forced handover timer expires

Physical context confirm

No free TCH channel,

Assignment failure

Clear command

Channel release

Deactive SACCHDisc

UaRelease indication

Rf channel release

Rf channel release ack

Queueing indication

TCH req for norm assign 001026

Ass req that can cause forced HO 001055

TCH req with prior subscriber  001095

001102

001103

001104

001105

FR TCH requestsor 

HR TCH requestsor 

FR pref TCH requestsor 

HR pref TCH requests

001137

001138

TCH seiz att for MOCor 

TCH seiz att for MTC

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

001118

001119

FR TCH req rej due to lackor HR TCH req rej due to lack

TCH req rej due to cong 001141

Forced HO req rejected 001059

no suitable calls for forced HO

priority subscriber 

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Figure 56. Unsuccessful forced handover with external handover.

MSC:BSC:BTS:MS:

TCH req rej due to lack 001011

TCH req with prior subscriber  001095

TCH requests 001010

Att to req HO with forced HO 001063

HO req rej with forced HO 001067

Meas report Meas result HO required

HO request

HO measurement, HO decision

Queuing indication

New TCH channel reservation

No suitable TCH for forced handover,

Priority call going on the TCH channel

Call continuous on the old channel

Clear command

Rf channel release

Rf channel release ack

HO failure

Clear complete

001102

001103

001104

001105

FR TCH requestsor 

HR TCH requestsor FR pref TCH requestsor 

HR pref TCH requests

001120

001121

FR TCH req rej due HR trafficor HR TCH req rej due FR traffic

001118

001119

FR TCH req rej due to lackor HR TCH req rej due to lack

forced handover timer expires

and activation in new BSC

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Figure 57. Reconfiguration from TCH to SDCCH.

MSC:BSC:BTS:MS:

SDCCH attempt 001000

Channel requestChannel required

Channel activation

Paging part

Radio access part on CCCH

001135

001136

SDCCH seiz att for MOCor SDCCH seiz att for MTC

Reconfiguration from idle TCH to active SDCCH

Dynamic SDCCH reconf attempt 001154

SDCCH succ seiz for imm assign 001007

Basic call signalling continuos, see figure 1

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Figure 58. Normal call.

MSC:BSC:BTS:MS:

Succ TCH seiz for ass complete 001148

Basic call signalling, see figure 1

Basic call signalling, see figure 1

TCH seized, FACCH signalling part

Assignment complete

Assignment complete

Sabm

Ua

Establish indication

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Figure 59. Mobile originated HSCSD call setup.

MSC:BSC:BTS:MS:

HSCSD req for call setup 001160

Classmark change Classmark update

Setup Setup

Normal signalling

Call proceedingCall proceeding

Channel activation

Channel activation ack

Assignment request

Physical context requestPhysical context confirm

Channel activation

Channel activation ack

Assignment command

Sabm Establish indicationUa

Assignment complete Assignment completeRf channel release

Rf channel release ackAlert AlertConnect Connect

Connect ackConnect ack

Release completeClear command

Clear completeChannel release

Deactivate SACCHDisc

UaRelease indication

Rf channel releaseRf channel release ack

Disconnect DisconnectReleaseRelease

Release complete

Normal signalling

HSCSD TCH req with 14,4HSCSD transp TCH req

001156 or 001158

001157 or 001159

HSCSD succ TCH req with 14,4HSCSD succ transp TCH seiz

HSCSD succ TCH 001162

Counters for TCH request and

TCH seized, FACCH signalling part

Conversation phase

Release by MS

succesful TCH seizures are also updated, see figure 2

seiz for call setup

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Figure 60. Successful internal inter-cell handover for HSCSD, target cell

allocations and activations for three channels.

MSC:BSC:BTS:MS:

HSCSD TCH request for HO 001161

HSCSD transp TCH request 001158

HSCSD TCH request with 14,4 001156

Meas report Meas result

Sabm Establish indication

HO measurement, Old TCH channel in the old BTS

Channel activation

Channel activation ack

Signalling on the old TCH channel in the old BTS

HO commandHO command

HO access HO detection

Physical info

Ua

Rr  HO performed

Rf channel release

Rf channel release ack

HO complete HO complete

Channel activation

Channel activation ack

Channel activation

Channel activation ack

New TCH channel reservation and activation in the new BTS

Normal handover counters are updated, see figure 35

HSCSD succ TCH seiz with 14,4 001157

HSCSD succ transp TCH seiz 001159

HSCSD succ TCH seiz for HO 001163

Signalling on the new TCH channel in the new BTS

Old TCH channel release in the old BTS

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Figure 62. Internal intra-cell direct access from a regular DCCH to the super-

reuse TRX. Optional software direct access to super-reuse TRX in

IUO activated.

MSC:BSC:BTS:MS:

Succ TCH seiz for dir acc 1165

Assignment request

Physical context request

Sabm Establish indication

Basic call signalling, see figure 1

Channel activation

Channel activation ack

Physical context confirm

Assignment command

Assignment command

Ua

Rr 

Assignment complete

Rf channel release

Rf channel release ack

Assignment complete Assignment complete

Alert Alert

Connect ackConnect ack

Connect Connect

Physical context information

Direct access to super-reuse TRX

TCH reservation and activation

Signalling on SDCCH

Signalling on FACCH - TCH

SDCCH release

Connection

Conversation phase

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Figure 63. Unsuccessful internal intra-cell direct access from regular DCCH to

the super-reuse TRX due to lack of resources. Optional software

direct access to super-reuse TRX in IUO activated.

MSC:BSC:BTS:MS:

TCH req for dir acc rej due lack 1166

Assignment request

Physical context request

Basic call signalling, see figure 1

Physical context confirm

Physical context information

Unsuccessful direct access attempt to super-reuse TRX

Signalling continuous on old channel

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Figure 65. Average counter updating.

Figure 66. Basic call. Optional software dynamic hotspot is activated.

MSC:BSC:BTS:MS:

Timer is started

After 20 seconds

Timer expires

Timer is started again

After 20 seconds

Timer expires

Average queue length for channelseizure request

Average queue length for channelseizure request

1018

1018

MSC:BSC:BTS:MS:

Basic call signalling, see figure 1

Physical context confirm

Channel activation

1150

1151

1152

1153

Succ TCH seiz when good qual in adjor TCH req rej due to bad qual in adjor Succ TCH seiz when qual betw goodand bad in adjor TCH req rej when qual betw goodand bad in adj

Basic call signalling continues

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Figure 67. Successful handover due to DADL/B.

Figure 68. Unsuccessful DADL/B handover due to lack of resources.

BTS: MSC:MS: BSC:

Succ TCH seiz for DADL/B HO001170

DADL/B start due to exceeded load001172

Channel activationChannel activation ack

Assignment request

Physical context request

Physical context confirm

Signalling

Signalling continues

BTS: MSC:MS: BSC:

TCH request in DADL/B HO rejected001171

DADL/B start due to exceeded load001172

Assignment request

Physical context request

Physical context confirm

Signalling

DR and queuing possible

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Figure 69. Successful BSC controlled TRHO.

Figure 70. Unsuccessful BSC controlled TRHO.

Related topics

1 Traffic Measurement 

BTS: MSC:MS: BSC:

Succ TCH seiz for BSC contr TRHO

001168

TCH request for BSC contr TRHO

001167

Channel activation

Channel activation ack

Normal HO signalling

Signalling on the old TCH channel in the old BTS

New TCH channel reservation and activation in the new BTS

HO decision

BTS: MSC:MS: BSC:

Rej TCH seiz for BSC contr TRHO due to lack

001169

TCH request for BSC contr TRHO

001167

HO decision

New TCH channel reservation

HO ends and signalling continuous on

and activation in the new BTS

the old TCH channel in the old BTS

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Counters of Traffic Measurement 

1 Traffic Measurement