Huawei Performance Counter

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HUAWEI BSC6000 Base Station Controller

Performance Counter Reference Contents

Issue 02 (2007-02-06) Huawei Technologies Proprietary i

Contents

1 SCCP Measurement...................................................................................................................1-1

1.1 Overview of SCCP Measurement ........................................................... ...................................................... 1-2

1.2 SCCP OSP Measurement ........................................................ ................................................................ ......1-2

1.2.1 Overview of SCCP OSP Measurement ................................................................... .............................1-2

1.2.2 Number of Sent UDT Messages ............................................................. .............................................1-3

1.2.3 Number of Received UDT Messages...................................................................................................1-3

1.2.4 Number of Sent XUDT Messages........................................................................................................1-4

1.2.5 Number of Received XUDT Messages................................................................................................1-4

1.2.6 Number of Sent CR Messages ................................................................. ............................................1-4

1.2.7 Number of Received CR Messages......................................................................................................1-5

1.2.8 Number of Sent CREF Messages.........................................................................................................1-5

1.2.9 Number of Received CREF Messages.................................................................................................1-6

1.2.10 Ratio of CREF by Peer SCCP............................................................................................................1-6

1.2.11 Ratio of CREF by Local SCCP..........................................................................................................1-6

1.2.12 Received CC Messages......................................................................................................................1-7

1.2.13 Sent CC Messages..............................................................................................................................1-7

1.2.14 Sent DT1 Messages............................................................................................................................1-8

1.2.15 Received DT1 Messages....................................................................................................................1-8

1.2.16 Sent RLSD Messages.........................................................................................................................1-8

1.2.17 Received RLSD Messages.................................................................................................................1-9

1.2.18 Sent RLC Messages ................................................................ ........................................................... 1-9

1.2.19 Received RLC Messages ................................................................... .............................................. 1-10

2 MTP3 Measurement ..................................................................................................................2-1

2.1 Overview of MTP3 Measurement.................................................................................................................2-2

2.2 MTP3 Link Measurement ................................................................ ............................................................. 2-2

2.2.1 Overview..............................................................................................................................................2-2

2.2.2 In-Service Duration of MTP3 Link......................................................................................................2-3

2.2.3 Out-of-Service Duration of MTP3 Link...............................................................................................2-4

2.2.4 Duration of MTP3 Link Fault ..................................................................... .........................................2-4

2.2.5 Duration of MTP3 Link Local Inhibition.............................................................................................2-4

2.2.6 Duration of MTP3 Link Remote Inhibition ........................................................................ .................2-5

2.2.7 Duration of MTP3 Link Remote Processor Fault ............................................................. ...................2-5


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2.2.8 Duration of MTP3 Link Congestion ...................................................................... ..............................2-6

2.2.9 Failures of MTP3 Link for All Reasons...............................................................................................2-6

2.2.10 MTP3 Link Local Inhibitions .................................................................. ..........................................2-6

2.2.11 MTP3 Link Remote Inhibitions .................................................................... .....................................2-7

2.2.12 MTP3 Link Remote Processor Failures ........................................................... ..................................2-7

2.2.13 MTP3 Link Local Switchovers ............................................................ ..............................................2-8

2.2.14 MSUs Sent on MTP3 Link.................................................................................................................2-8

2.2.15 MSUs Received on MTP3 Link.........................................................................................................2-9

2.2.16 MTP3 Link Congestions .............................................................. ...................................................... 2-9

2.2.17 Discarded MSUs During Link Congestion .................................................................... ....................2-9

2.2.18 Transfer Inhibition Messages Received on MTP3 Link...................................................................2-10

2.2.19 Octets in SIFs or SIOs Sent on MTP3 Link.....................................................................................2-10

2.2.20 Octets in SIFs and SIOs Received by MTP3 Link...........................................................................2-11

2.2.21 64 kbit/s Timeslots Occupied by a Signaling Link...........................................................................2-11

2.2.22 Ratio of Transmit Bandwidth to Total Bandwidth ................................................................... ........2-11

2.2.23 Ratio of Receive Bandwidth to Total Bandwidth........................ ..................................................... 2-12

2.2.24 Bytes of MTP2 Message Head in MSU Messages on MTP3 Link..................................................2-12

3 LAPD Measurement ..................................................................................................................3-1

3.1 Overview of LAPD Measurement.................................................................................................................3-2

3.2 LAPD Link Measurement ............................................................... .............................................................. 3-2

3.2.1 Overview..............................................................................................................................................3-2

3.2.2 SABME Frames Sent on LAPD Link ..................................................................... .............................3-3

3.2.3 SABME Frames Received on LAPD Link ........................................................... ...............................3-4

3.2.4 REJ Frames Sent on LAPD Link.......................................................................... ...............................3-4

3.2.5 REJ Frames Received on LAPD Link .................................................................... .............................3-4

3.2.6 RNR Frames Sent on LAPD Link........................................................................................................3-5

3.2.7 RNR Frames Received on LAPD Link................................................................................................3-5

3.2.8 I Frames Resent on LAPD Link...........................................................................................................3-6

3.2.9 Incorrect I Frames Received on LAPD Link ...................................................................... .................3-6

3.2.10 I Frames Received on LAPD Link from Application Layer .............................................................. 3-6

3.2.11 I Frames Sent on LAPD Link.............................................................................................................3-7

3.2.12 I Frames Received by LAPD Link.....................................................................................................3-73.2.13 I Frames Discarded by LAPD Link ............................................................... ....................................3-8

3.2.14 UA Frames Sent on LAPD Link .......................................................................... ..............................3-8

3.2.15 UA Frames Received by LAPD Link.................................................................................................3-8

3.2.16 UI Frames Received by LAPD Link..................................................................................................3-9

4 System Load Measurement ......................................................................................................4-1

4.1 Overview of System Load Measurement .......................................................................... ............................4-2

4.2 CPU Usage Measurement ....................................................... ................................................................ ......4-2

4.2.1 Overview..............................................................................................................................................4-2

4.2.2 Mean CPU Usage.................................................................................................................................4-3


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4.2.3 Maximum CPU Usage .............................................................. ........................................................... 4-3

5 BTSM Management...................................................................................................................5-1

5.1 Overview of BTSM Measurement ..................................................................... ...........................................5-2

5.2 BTS State Measurement per BTS..................................................................................................................5-25.2.1 Overview..............................................................................................................................................5-2

5.2.2 Successful BTS Initializations ...................................................................... .......................................5-3

5.2.3 Failed BTS Initializations ................................................................ .................................................... 5-3

5.2.4 BTS OML Disruption Duration ..................................................................... ......................................5-4

5.2.5 BTS Out-of-Service Duration ..................................................................... .........................................5-4

5.2.6 BTS Availability...................................................................................................................................5-4

5.2.7 BTS In-Service Duration ........................................................................... ..........................................5-5

5.3 BTS Configuration Measurement per BM Subrack ........................................................................... ...........5-5

5.3.1 Overview..............................................................................................................................................5-5

5.3.2 Activated BTSs ............................................................. ....................................................................... 5-6

5.3.3 Available BTSs.....................................................................................................................................5-6

5.4 Cell State Measurement per Cell...................................................................................................................5-6

5.4.1 Overview..............................................................................................................................................5-6

5.4.2 Successful Cell Initializations..............................................................................................................5-7

5.4.3 Failed Cell Initializations.....................................................................................................................5-7

5.4.4 Cell BCCH Mutual Aid........................................................................................................................5-8

5.4.5 Recoveries after Cell BCCH Mutual Aid.............................................................................................5-8

5.4.6 Cell Baseband Hopping Mutual Aid .................................................................. ..................................5-9

5.4.7 Recoveries After Cell Baseband Hopping Mutual Aid ............................................................. ...........5-9

5.4.8 Cell Out-of-Service Duration...............................................................................................................5-9

5.4.9 Cell Availability ............................................................. .................................................................... 5-10

5.4.10 Cell In-Service Duration ..................................................................... ............................................. 5-10

5.5 Cell Configuration Measurement per BM Subrack.....................................................................................5-11

5.5.1 Overview............................................................................................................................................5-11

5.5.2 Activated Cells...................................................................................................................................5-11

5.5.3 Available Cells .............................................................. ................................................................ .....5-11

5.6 TRX State Measurement per TRX................................................................... ........................................... 5-12

5.6.1 Overview............................................................................................................................................5-125.6.2 TRX Out-of-Service Duration............................................................................................................5-12

5.7 TRX Configuration Measurement per BM Subrack....................................................................................5-13

5.7.1 Overview............................................................................................................................................5-13

5.7.2 Activated TRXs..................................................................................................................................5-13

5.7.3 Available TRXs................................................................... ............................................................... 5-13

5.7.4 TRX Availability ............................................................ .................................................................... 5-14

5.8 CRC Error Measurement per BTS .................................................................. ............................................ 5-14

5.8.1 Overview............................................................................................................................................5-14

5.8.2 Duration of CRC Error on Ports 0 Through 23..................................................................................5-15


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5.9 CRC Serious Error Measurement per BTS .............................................................. ...................................5-16

5.9.1 Overview............................................................................................................................................5-16

5.9.2 Duration of Serious CRC Error on Ports 0 Through 23 ................................................................... ..5-16

5.10 OML Measurement per BTS.....................................................................................................................5-18

5.10.1 Overview..........................................................................................................................................5-18

5.10.2 OML Setup Requests Sent by BTS................................................................... ...............................5-19

5.10.3 OML Setup Requests Received by BTS ............................................................... ...........................5-19

5.10.4 BTS-Sent Rejects to the OML Setup Requests ................................................................ ................5-20

5.10.5 BTS-Received Rejects to the OML Setup Requests ........................................................................ 5-20

5.10.6 OML RNR Frames Sent by BTS.......................................................................................... ............5-21

5.10.7 OML RNR Frames Received by BTS..............................................................................................5-21

5.10.8 OML I Frames Resent by BTS.........................................................................................................5-22

5.10.9 OML NRERR Received by BTS ....................................................................... ..............................5-22

5.10.10 OML L3 Data Requests Received by BTS ............................................................ ........................5-23

5.10.11 OML I Frames Sent by BTS...........................................................................................................5-23

5.10.12 OML I Frames Received by BTS...................................................................................................5-24

5.10.13 Queue Overflows of OML Messages Sent by BTS..................................... ...................................5-24

5.10.14 Erroneously Received OML Long Frames by BTS Physical Layer............................................... 5-25

5.10.15 OML Byte Errors Received by BTS Physical Layer......................................................................5-25

5.10.16 OML Discarded Series Received by BTS Physical Layer ............................................................. 5-26

5.10.17 OML CRC Errors Received by BTS..............................................................................................5-26

5.10.18 L1 and L2 Overflows of BTS OML...............................................................................................5-27

5.10.19 Total OML Frames Received by BTS Physical Layer ................................................................... 5-275.11 RSL Measurement per TRX .................................................................... ..................................................5-28

5.11.1 Overview..........................................................................................................................................5-28

5.11.2 RSL Setup Requests Sent from BTS................................................................... .............................5-29

5.11.3 RSL Setup Requests Received from BTS ................................................................... .....................5-29

5.11.4 BTS-Sent Rejects to the RSL Setup Requests Sent by BTS ............................................................ 5-30

5.11.5 BTS-Received Rejects to the RSL Setup Requests .......................................................... ................5-30

5.11.6 RSL RNR Frames Sent by BTS.................................................................. .....................................5-31

5.11.7 RSL RNR Frames Received by BTS................................................... .............................................5-31

5.11.8 RSL I Frames Resent by BTS ....................................................................... ...................................5-32

5.11.9 RSL NRERR Received by BTS......................................................................... ..............................5-32

5.11.10 RSL Layer 3 Requests Received by BTS.......................................................................................5-33

5.11.11 RSL I Frames Sent by BTS......................................................................... ...................................5-33

5.11.12 RSL I Frames Received by BTS ...................................................................... ..............................5-34

5.11.13 Queue Overflows of RSL Messages Sent by BTS ......................................................................... 5-34

5.11.14 Erroneously Received RSL Long Frames by BTS Physical Layer ................................................ 5-35

5.11.15 RSL Octet Errors Received by BTS Physical Layer ...................................................................... 5-35

5.11.16 RSL Discarded Sequences Received by BTS Physical Layer........................ ................................5-36

5.11.17 RSL CRC Errors Received by BTS................................................................................................5-36

5.11.18 L1 and L2 Overflows of BTS RSL ..................................................................... ...........................5-37


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5.11.19 Total RSL Frames Received by BTS Physical Layer ........................................................... ..........5-37

6 Resources Measurement...........................................................................................................6-1

6.1 Overview of Resources Measurement...........................................................................................................6-2

6.2 A Interface Circuit Measurement per DPC................................................................................... .................6-26.2.1 Overview..............................................................................................................................................6-2

6.2.2 Mean Number of Uninstalled Circuits on the A Interface................. ................................................... 6-3

6.2.3 Mean Number of Faulty Circuits on the A Interface........................................................................ ....6-3

6.2.4 Mean Number of Circuits in Maintenance State on the A Interface........................ .............................6-4

6.2.5 Mean Number of Blocked Circuits on the A Interface.........................................................................6-4

6.2.6 Mean Number of Idle Circuits on the A Interface................................................................................6-5

6.2.7 Mean Number of Busy Circuits on the A Interface..............................................................................6-5

6.2.8 Mean Number of Circuits with Uninstalled Peer Circuits on the A Interface ......................................6-6

6.3 TC Measurement per DPC .................................................................. .......................................................... 6-6

6.3.1 Overview..............................................................................................................................................6-6

6.3.2 Mean Number of Faulty TC Resources................................................................................................6-7

6.3.3 Mean Number of Idle TC Resources....................................................................................................6-7

6.3.4 Mean Number of Busy TC Resources..................................................................................................6-8

6.4 Pb Interface Circuit Measurement per PCU..................................................................................................6-8

6.4.1 Overview..............................................................................................................................................6-8

6.4.2 Mean Number of Faulty Circuits on the Pb Interface .................................................................. ........6-9

6.4.3 Mean Number of Blocked Circuits on the Pb Interface .................................................................... ...6-9

6.4.4 Mean Number of Idle Circuits on the Pb Interface ............................................................ ................6-10

6.4.5 Mean Number of Busy Circuits on the Pb Interface .............................................................. ............6-10

6.4.6 Mean Number of Circuits in Maintenance State on the Pb Interface................................................. 6-11

6.5 Ater Interface Circuit Measurement per BM Subrack.................................................................................6-11

6.5.1 Overview............................................................................................................................................6-11

6.5.2 Mean Number of Faulty Circuits on the Ater Interface......................................................................6-12

6.5.3 Mean Number of Idle Circuits on the Ater Interface..........................................................................6-12

6.5.4 Mean Number of Busy Circuits on the Ater Interface........................................................................6-13

7 MSC Measurement....................................................................................................................7-1

7.1 Overview of MSC Measurement...................................................................................................................7-2

7.2 MSC Measurement per DPC.........................................................................................................................7-2

7.2.1 Overview..............................................................................................................................................7-2

7.2.2 Number of MSC Resets ................................................................. ...................................................... 7-2

7.2.3 Number of Messages Received from MSC..........................................................................................7-3

8 CBC Measurement .....................................................................................................................8-1

8.1 Overview of CBC Measurement ...................................................................... ............................................. 8-2

8.2 CBC Measurement per BSC ................................................................. ........................................................ 8-2

8.2.1 Overview..............................................................................................................................................8-2

8.2.2 WRITE-REPLACE Requests Received by BSC ................................................................... ..............8-3

8.2.3 KILL Requests Received by BSC........................................................................................................8-4


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8.2.4 STATUS-CBCH-QUERY Requests Received by BSC...................... ..................................................8-4

8.2.5 STATUS-MESSAGE-QUERY Requests Received by BSC ................................................................ 8-4

8.2.6 SET-DRX Requests Received by BSC ............................................................................ ....................8-5

8.2.7 RESET Requests Received by BSC.....................................................................................................8-5

8.2.8 REPORT Responses to WRITE-REPLACE Requests.................................................................. .......8-6

8.2.9 REJECT Responses to WRITE-REPLACE Requests.......................................................................... 8-6

8.2.10 REPORT Responses to KILL Requests .................................................................. ...........................8-7

8.2.11 REJECT Responses to KILL Requests ................................................................... ...........................8-7

8.2.12 REPORT Responses to STATUS-CBCH-QUERY Requests ............................................................. 8-8

8.2.13 REJECT Responses to STATUS-CBCH-QUERY Requests .............................................................. 8-8

8.2.14 REPORT Responses to STATUS-MESSAGE-QUERY Requests......................................................8-9

8.2.15 REJECT Responses to STATUS-MESSAGE-QUERY Requests ......................................................8-9

8.2.16 REPORT Responses to SET-DRX Requests....................... ............................................................. 8-10

8.2.17 REJECT Responses to SET-DRX Requests............................................... ......................................8-10

8.2.18 RESTART-INDICATION Requests Sent from BSC...................................................................... ..8-11

8.2.19 REJECT Responses to RESTART-INDICATION Requests ............................................................ 8-11

8.2.20 FAILURE-INDICATION Requests Sent from BSC.................................................................. ......8-12

8.2.21 CBCH Loading Indications Received by BSC (Overflow)..............................................................8-12

8.2.22 CBCH Loading Indications Received by BSC (Underflow)............................................................8-12

8.2.23 WRITE-REPLACE Requests (WRITE Requests) Received by BSC..............................................8-13

8.2.24 REPORT Responses to WRITE-REPLACE Requests (WRITE Requests) .....................................8-13

8.2.25 REJECT Responses to WRITE-REPLACE Requests (WRITE Requests) ......................................8-14

8.2.26 WRITE-REPLACE Requests (REPLACE Requests) Received by BSC..................... ....................8-148.2.27 REPORT Responses to WRITE-REPLACE Requests (REPLACE Requests) ................................8-15

8.2.28 REJECT Responses to WRITE-REPLACE Requests (REPLACE Requests) .................................8-15

8.2.29 Mean Capacity of BSC Message Library.........................................................................................8-16

8.2.30 Disruptions of the BSC-CBC Connection........................................................................................8-16

9 PCU Measurement .....................................................................................................................9-1

9.1 Overview of PCU Measurement ..................................................................... ..............................................9-2

9.2 PCU Measurement per BSC..........................................................................................................................9-2

9.2.1 Overview..............................................................................................................................................9-2

9.2.2 Total Messages Received from PCU....................................................................................................9-29.3 PCU Measurement per PCU ........................................................... .............................................................. 9-3

9.3.1 Overview..............................................................................................................................................9-3

9.3.2 Messages Received from a PCU..........................................................................................................9-3

10 Paging Measurement.............................................................................................................10-1

10.1 Overview of Paging Measurement.................................................................... ........................................10-2

10.2 A Interface Paging Measurement ............................................................ .................................................. 10-2

10.2.1 Overview of A Interface Paging Measurement ...................................................................... ..........10-2

10.2.2 MSC-Initiated Paging Requests for CS Service...............................................................................10-3

10.2.3 SGSN-Initiated Paging Requests for CS Service............. ................................................................ 10-3


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10.2.4 SGSN-Initiated Paging Requests for PS Service ........................................................................... ..10-4

10.2.5 Delivered to BTS for CS Service.....................................................................................................10-5

10.3 Abis Interface Paging Measurement..........................................................................................................10-6

10.3.1 Overview of Abis Interface Paging Measurement ............................................................ ...............10-6

10.3.2 Delivered Paging Messages for CS Service.....................................................................................10-6

10.3.3 Delivered Paging Messages for PS Service ........................................................................ .............10-7

10.4 Measurement of Discarded Paging Messages due to Overload per LAPD ...............................................10-8

10.4.1 Overview of Measurement of Discarded Paging Messages due to Overload per LAPD................. 10-8

10.4.2 SM Pagings Discarded on LAPD Link ..................................................................... .......................10-9

10.4.3 CS Pagings Discarded on LAPD Link ....................................................................... ......................10-9

10.4.4 PS Pagings Discarded on LAPD Link ....................................................................... ......................10-9

11 Call Measurement..................................................................................................................11-1

11.1 Overview of Call Measurement.................................................................................................................11-3

11.2 Call Duration Measurement per BSC........................................................................................................11-4

11.2.1 Overview..........................................................................................................................................11-4

11.2.2 Mean Duration of Call Access ........................................................................... .............................. 11-4

11.2.3 Mean Duration of Call Establishment..............................................................................................11-4

11.3 Flow Control Measurement per Cell .................................................................... ..................................... 11-5

11.3.1 Overview..........................................................................................................................................11-5

11.3.2 MSG DEL IND Messages Sent on Abis Interface .............................................................. .............11-6

11.3.3 MSG CCCH LOAD IND (RACH) Messages Sent on Abis Interface.............................................. 11-6

11.3.4 MSG CCCH LOAD IND (PCH) Messages Sent on Abis Interface............. .................................... 11-7

11.3.5 PACKET CCCH LOAD IND Messages Sent on Abis Interface...................................................... 11-7

11.3.6 MSG ABIS OVERLOAD (CCCH OVERLOAD) Messages Sent on Abis Interface ...................... 11-8

11.3.7 MSG ABIS OVERLOAD (PROCESSOR OVERLOAD) Messages Sent on Abis Interface ..........11-8

11.3.8 LOAD IND Messages Sent on the A-Interface.......... ...................................................................... 11-9

11.3.9 Increases of Flow Control Levels.....................................................................................................11-9

11.3.10 Decreases of Flow Control Levels .......................................................................... ..................... 11-10

11.3.11 Ignored Trigger Events......................................... ...................................................................... .. 11-11

11.3.12 Highest Level Delays .................................................................... ............................................... 11-11

11.4 Short Message Measurement per Cell.....................................................................................................11-12

11.4.1 Overview........................................................................................................................................11-1211.4.2 Uplink Point-to-Point Short Messages on SDCCH........................................................................11-12

11.4.3 Downlink Point-to-Point Short Messages on SDCCH................................................................... 11-13

11.4.4 Uplink Point-to-Point Short Messages on TCH................................................................. ............11-13

11.4.5 Downlink Point-to-Point Short Messages on TCH ............................................................. ...........11-13

11.4.6 Total Uplink Point-to-Point Short Messages..................................................................................11-14

11.4.7 Total Downlink Point-to-Point Short Messages........................................................................... ..11-14

11.4.8 Point-to-Point Short Messages on SDCCH....................................................................................11-15

11.4.9 Point-to-Point Short Messages on TCH ................................................................. ........................ 11-15

11.5 Call Drop Measurement per Cell.............................................................................................................11-15


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11.5.1 Overview........................................................................................................................................11-15

11.5.2 Call Drop Sampled Measurement per Cell.....................................................................................11-16

11.5.3 Call Drop Analyzed Measurement per Cell.................................................................................. ..11-21

11.6 Channel Activation Measurement per Cell..............................................................................................11-29

11.6.1 Overview........................................................................................................................................11-29

11.6.2 SDCCH Connection Measurement per Cell...................................................................................11-30

11.6.3 TCH Connection Measurement per Cell .................................................................. ...................... 11-32

11.6.4 Channel Activation Analyzed Measurement per Cell................................................................... ..11-37

11.7 Channel Seizure Measurement per TRX......................................................................... ........................ 11-42

11.8 Immediate Assignment Measurement per Cell........................................................................................11-45

11.8.1 Overview........................................................................................................................................11-45

11.8.2 Channel Requests per Cell ...................................................................... ....................................... 11-46

11.8.3 Immediate Assignment Commands per Cell .................................................................... ..............11-47

11.8.4 Call Setup Indications per Cell.......................................................................................................11-49

11.8.5 Rejects to Service Requests per Cell..............................................................................................11-51

11.8.6 Immediate Assignment Analyzed Measurement per Cell....................................... ........................ 11-52

11.9 Assignment Measurement per Cell..........................................................................................................11-55

11.9.1 Overview........................................................................................................................................11-55

11.9.2 Assignment Requests per Cell........................................................................................................11-55

11.9.3 Assignment Commands per Cell....................................................................................................11-58

11.9.4 Completed Assignments per Cell .................................................................... ............................... 11-60

11.9.5 Failed Assignments per Cell...........................................................................................................11-61

11.9.6 Mode Modify Commands per Cell.................................................................................................11-6411.9.7 Failed Mode Modify Attempts per Cell ............................................................................ .............11-66

11.9.8 Assignment Procedure Analyzed Measurement per Cell ............................................................ ...11-68

11.10 Intra-Cell Handover Measurement per Cell ..................................................................... ..................... 11-70

11.10.1 Overview......................................................................................................................................11-70

11.10.2 Intra-Cell Handover Requests per Cell ................................................................ ........................ 11-72

11.10.3 Intra-Cell Handover Commands per Cell.....................................................................................11-73

11.10.4 Failed Intra-Cell Handovers per Cell ....................................................................... .................... 11-74

11.10.5 Intra-Cell AMR Handover per Cell..............................................................................................11-80

11.10.6 Intra-Cell Handover Detection Messages Received by BSC per Cell.......................................... 11-82

11.10.7 Intra-Cell Handover Measurement per Cell ........................................................................ .........11-83

11.11 Incoming Internal Inter-Cell Handover Measurement per Cell ............................................................. 11-88

11.11.1 Overview......................................................................................................................................11-88

11.11.2 Incoming Internal Inter-Cell Handover Requests per Cell ........................................................... 11-90

11.11.3 Incoming Internal Inter-Cell Handover Responses per Cell......................................................... 11-91

11.11.4 Failed Incoming Internal Inter-Cell Handovers per Cell..............................................................11-93

11.11.5 Incoming Internal Inter-Cell Handover Detection Messages Received by BSC per Cell ............11-97

11.11.6 Incoming Internal Inter-Cell Handover Analyzed Measurement per Cell .................................... 11-98

11.12 Outgoing Internal Inter-Cell Handover Measurement per Cell ........................................................... 11-100

11.12.1 Overview....................................................................................................................................11-100


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11.12.2 Outgoing Internal Inter-Cell Handover Requests per Cell ......................................................... 11-105

11.12.3 Outgoing Internal Inter-Cell Handover Commands per Cell ..................................................... 11-108

11.12.4 Failed Outgoing Internal Inter-Cell Handovers per Cell ........................................................... . 11-111

11.12.5 Outgoing Internal Inter-Cell Handover Measurement per Cell.................................................. 11-121

11.13 Incoming External Inter-Cell Handover Measurement per Cell................................. ......................... 11-126

11.13.1 Overview....................................................................................................................................11-126

11.13.2 Incoming External Inter-Cell Handover Requests per Cell........................................................11-128

11.13.3 Incoming External Inter-Cell Handover Responses per Cell ..................................................... 11-130

11.13.4 Failed Incoming External Inter-Cell Handovers per Cell...........................................................11-131

11.13.5 Incoming External Inter-Cell Handover Detection Messages Received by BSC per Cell .........11-136

11.13.6 Incoming External Inter-Cell Handover Analyzed Measurement per Cell................................. 11-137

11.14 Outgoing External Inter-Cell Handover Measurement per Cell .......................................................... 11-140

11.14.1 Overview....................................................................................................................................11-140

11.14.2 Outgoing External Inter-Cell Handover Requests per Cell ........................................................ 11-144

11.14.3 Outgoing External Inter-Cell Handover Commands per Cell .................................................... 11-147

11.14.4 Failed Outgoing External Inter-Cell Handovers per Cell...........................................................11-151

11.14.5 Outgoing External Inter-Cell Handover Analyzed Measurement per Cell................................. 11-164

11.15 Incoming Inter-RAT Inter-Cell Handover Measurement per Cell ....................................................... 11-170

11.15.1 Overview....................................................................................................................................11-170

11.15.2 Incoming Inter-RAT Inter-Cell Handover Requests per Cell ..................................................... 11-172

11.15.3 Incoming Inter-RAT Inter-Cell Handover Responses per Cell ................................................... 11-173

11.15.4 Failed Incoming Inter-RAT Inter-Cell Handovers per Cell ........................................................ 11-174

11.15.5 Incoming Inter-RAT Inter-Cell Handover Analyzed Measurement per Cell .............................. 11-17611.16 Outgoing Inter-RAT Inter-Cell Handover Measurement per Cell ....................................................... 11-178

11.16.1 Overview....................................................................................................................................11-178

11.16.2 Outgoing Inter-RAT Inter-Cell Handover Requests per Cell ..................................................... 11-181

11.16.3 Outgoing Inter-RAT Inter-Cell Handover Commands per Cell .................................................. 11-182

11.16.4 Failed Outgoing Inter-RAT Inter-Cell Handovers per Cell ........................................................ 11-183

11.16.5 Outgoing Inter-RAT Inter-Cell Handover Analyzed Measurement per Cell .............................. 11-189

11.17 GSM Cell to GSM Cell Incoming Handover Measurement................................................................11-193

11.17.1 Overview....................................................................................................................................11-193

11.17.2 Cell Incoming Handover Requests (Cell to Cell).......................................................................11-194

11.17.3 Failed Cell Incoming Handovers (Cell to Cell)..........................................................................11-194

11.17.4 Cell Incoming Handover Analyzed Measurement (Cell to Cell).................... ............................ 11-195

11.18 GSM Cell to GSM Cell Outgoing Handover Measurement ................................................................ 11-196

11.18.1 Overview....................................................................................................................................11-196

11.18.2 Cell Outgoing Handover Commands (Cell to Cell) ................................................................... 11-197

11.18.3 Failed Cell Outgoing Handovers (Cell to Cell)..........................................................................11-198

11.18.4 Cell Outgoing Handover Analyzed Measurement (Cell to Cell)...................... .......................... 11-200

11.19 Measurement of MRs upon Handover Initiation per Cell ......................................................... .......... 11-201

11.19.1 Overview....................................................................................................................................11-201

11.19.2 Measurement of MRs upon Handover Initiation (Receiving Quality) per Cell.......................... 11-202


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11.19.3 Mean Uplink Receiving Level during Handover Initiation per Cell .......................................... 11-203

11.19.4 Mean Uplink Receiving Quality during Handover Initiation per Cell ....................................... 11-204

11.19.5 Concentric Cell Handover Initiation MR Analyzed Measurement (Receiving Level) per Cell .11-205

11.19.6 Concentric Cell Handover Initiation MR Analyzed Measurement (Timing Advance) per Cell .11-206

11.20 KPI Measurement per Cell ........................................................................ .......................................... 11-207

11.20.1 Overview....................................................................................................................................11-207

11.20.2 Immediate Assignment Requests .................................................................... ........................... 11-208

11.20.3 Immediate Assignment Commands............................................................................................11-209

11.20.4 SDCCH Seizure Requests ........................................................................ .................................. 11-209

11.20.5 Failed SDCCH Seizures due to Busy SDCCH...........................................................................11-210

11.20.6 Successful SDCCH Seizures......................................................................................................11-210

11.20.7 Traffic Volume on SDCCH ....................................................................... ................................. 11-211

11.20.8 Traffic Volume on SDCCH ....................................................................... ................................. 11-212

11.20.9 Available SDCCHs.....................................................................................................................11-212

11.20.10 Configured SDCCHs................................................................................................................11-212

11.20.11 TCH Seizure Requests (Signaling Channel)............................................................................. 11-213

11.20.12 Failed TCH Seizures due to Busy TCH (Signaling Channel) .................................................. 11-213

11.20.13 Successful TCH Seizures (Signaling Channel) .............................................................. .......... 11-214

11.20.14 Call Drops on TCH (Signaling Channel) ...................................................................... ........... 11-214

11.20.15 Traffic Volume on TCH (Signaling Channel)....................................... .................................... 11-215

11.20.16 TCH Seizure Requests (Traffic Channel)......... ..................................................................... ...11-215

11.20.17 Failed TCH Seizures due to Busy TCH (Traffic Channel)..................................................... ..11-216

11.20.18 Successful TCH Seizures (Traffic Channel)............................................................................ .11-21611.20.19 Call Drops on TCH in Stable State (Traffic Channel)................................. ............................. 11-216

11.20.20 TCH Seizure Requests in TCH Handovers (Traffic Channel)............................. ..................... 11-217

11.20.21 Failed TCH Seizures in TCH Handovers due to Busy TCH (Traffic Channel)........................ 11-218

11.20.22 Successful TCH Seizures in TCH Handovers (Traffic Channel) ............................................. 11-218

11.20.23 Call Drops in TCH Handovers (Traffic Channel) .................................................................... 11-219

11.20.24 Traffic Volume on TCH (Traffic Channel) .......................................................................... .....11-219

11.20.25 Available TCHs ................................................................ ........................................................ 11-220

11.20.26 Configured TCHs.................................................................... ................................................. 11-220

11.20.27 Dual-Band Handover Requests ...................................................................... .......................... 11-220

11.20.28 Successful Dual-Band Handovers............................................................................................11-221

11.21 Calls Discarded due to Overload per LAPD........................................................................................11-223

11.21.1 Overview....................................................................................................................................11-223

11.21.2 Random Access Requests Discarded on LAPD ................................................................... ......11-223

12 MR Measurement...................................................................................................................12-1

12.1 Overview of MR Measurement.................................................................................................................12-3

12.2 Number of MRs per Cell...........................................................................................................................12-3

12.2.1 Overview of Number of MRs per Cell.............................................................................................12-3

12.2.2 Sampled MRs per Cell .................................................................. ................................................... 12-4


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12.2.3 Analyzed MRs per Cell....................................................................................................................12-5

12.3 Interference Band Measurement per TRX.................................................................................................12-6

12.3.1 Overview of Interference Band Measurement per TRX .................................................................. 12-6

12.3.2 Sampled Measurement of Interference Band per TRX.................................................................... 12-7

12.3.3 Analyzed Measurement of Interference Band per TRX................................................................... 12-8

12.4 Power Control Messages per Cell ........................................................................ ...................................12-10

12.4.1 Overview of Power Control Messages per Cell ................................................................ .............12-10

12.4.2 Number of Power Control Messages per Cell................................................................................12-11

12.4.3 Sampled Power Rank During Power Control per Cell.............................. .....................................12-12

12.4.4 Analyzed Power Rank During Power Control per Cell............................. .....................................12-12

12.4.5 Sampled Level of Power Control Signals per Cell........................................................... ..............12-13

12.4.6 Analyzed Level of Power Control Signals per Cell ....................................................................... 12-14

12.4.7 Sampling Quality of Power Control Signals per Cell ................................................................. ...12-14

12.4.8 Analyzed Quality of Power Control Signals per Cell.....................................................................12-15

12.4.9 Sampled Duration of Maximum Power per Cell............................................................................12-15

12.4.10 Analyzed Duration of Maximum Power per Cell.........................................................................12-16

12.4.11 Distance Between MS and BTS per Cell ................................................................ .....................12-17

12.4.12 Maximum Distance Between MS and BTS per Cell....................................................................12-17

12.4.13 Number of Power Control Messages per Cell..............................................................................12-18

12.4.14 Mean Distance Between MS and BTS.........................................................................................12-18

12.5 Neighbor Cell Level Measurement per Cell............................................................................................12-18

12.5.1 Overview of Neighbor Cell Level Measurement per Cell..............................................................12-18

12.5.2 Strength of Signals in Neighbor Cells............................................................................................12-1912.5.3 Number of MRs of Neighbor Cells................................................................................................12-19

12.5.4 Mean Strength of Signals in Neighbor Cells..................................................................................12-20

12.6 TCHF Receive Level Measurement per TRX................................................................. ........................12-20

12.7 TCHH Receive Level Measurement per TRX.........................................................................................12-29

12.8 Receive Quality Measurement per TRX .............................................................. ...................................12-36

12.9 Uplink-and-Downlink Balance Measurement per TRX.............................................................. ............12-39

12.10 Number of MRs Based on TA per TRX ........................................................... .....................................12-41

12.11 Radio Link Failure Measurement per TRX......... ..................................................................... .............12-43

12.11.1 Overview of Radio Link Failure Measurement per TRX................... .......................................... 12-43

12.11.2 Uplink and Downlink Level During Radio Link Failure per TRX...............................................12-44

12.11.3 Mean Uplink and Downlink Level During Radio Link Failure per TRX ....................................12-44

12.11.4 Uplink and Downlink Quality During Radio Link Failure per TRX............................................ 12-46

12.11.5 Mean Uplink and Downlink Quality During Radio Link Failure per TRX..................................12-47

12.11.6 TA During Radio Link Failure per TRX .................................................................... ..................12-48

12.11.7 Mean TA During Radio Link Failure per TRX ..................................................................... .......12-48

12.11.8 Sampled Radio Link Failures per TRX........................................................................................12-49

12.12 Radio Link Failure Measurement based on TA per TRX ................................................................... ...12-50

12.13 RQI Measurement based on TA per TRX..............................................................................................12-52

12.13.1 Overview of RQI Measurement based on TA per TRX ............................................................... 12-52


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12.13.2 Sampled RQI based on TA per TRX........................................................ ....................................12-52

12.13.3 Analyzed RQI based on TA per TRX........................................................ ...................................12-55

13 Channel Measurement ..........................................................................................................13-1

13.1 Overview of Channel Measurement..........................................................................................................13-313.2 Channel Configuration Measurement per Cell..........................................................................................13-3

13.2.1 Overview..........................................................................................................................................13-3

13.2.2 Sampled Measurement of Initially Configured Channels ................................................................ 13-4

13.2.3 Analyzed Measurement of Dynamically Configured Channels ....................................................... 13-7

13.2.4 Analyzed Measurement of Available Channels............................................................................ ..13-12

13.2.5 SDCCH Availability.......................................................................................................................13-19

13.2.6 TCH Availability .......................................................... .................................................................. 13-19

13.2.7 Analyzed Measurement of Initially Configured Channels ............................................................. 13-20

13.3 Channel Conversion Measurement per Cell............................................................................................13-22

13.3.1 Overview........................................................................................................................................13-22

13.3.2 Channel Conversion Requests (TCHF-TCHH)..............................................................................13-23

13.3.3 Successful Channel Conversions (TCHF-TCHH) ................................................................ .........13-24

13.3.4 Channel Conversion Requests (TCHH-TCHF)..............................................................................13-25

13.3.5 Successful Channel Conversions (TCHH-TCHF) ......................................................................... 13-25

13.3.6 Number of Channel Conversions (TCH-SDCCH).........................................................................13-26

13.3.7 Number of Channel Conversions (SDCCH-TCH).........................................................................13-27

13.4 Channel Busy Duration Measurement per Cell.......................................................................................13-27

13.4.1 Overview........................................................................................................................................13-27

13.4.2 Busy State Duration of All Channels (SDCCH/TCHF/TCHH) ..................................................... 13-28

13.4.3 Mean Duration of Busy State for All Channels (SDCCH/TCHF/TCHH)......................................13-29

13.5 Measurement of Maximum Busy Channels per Cell...............................................................................13-30

13.6 Channel State Measurement per Cell ................................................................. .....................................13-31

13.6.1 Overview........................................................................................................................................13-31

13.6.2 Mean Number of Busy Signaling Channels (SDCCH/TCHF/TCHH)........... ................................13-32

13.6.3 Mean Number of Busy TCHs (TCHF/TCHH).............................. ................................................. 13-33

13.6.4 Mean Number of Blocked Channels.............. ..................................................................... ...........13-34

13.6.5 Mean Number of Idle Channels .......................................................................... ...........................13-35

13.6.6 Mean Number of Busy TCHs (Overlaid Subcell)........... ............................................................... 13-3613.6.7 Mean Number of Busy TCHs (Underlaid Subcell)............ ............................................................ 13-36

13.6.8 Mean Number of Busy Signaling Channels (SDCCH/TCHF/TCHH)........... ................................13-37

13.6.9 Mean Number of Busy TCHs (TCHF/TCHH).............................. ................................................. 13-38

13.7 Channel Assignment Request Measurement per Cell........................................... ...................................13-38

13.7.1 Overview........................................................................................................................................13-38

13.7.2 Channel Assignment Requests in Immediate Assignment Procedure (SDCCH/TCHF/TCHH/TCH)13-

39

13.7.3 Channel Assignment Requests in Assignment Procedure (TCHF/TCHH/TCH) ...........................13-41

13.7.4 Channel Assignment Requests in Internal Intra-Cell Handover Procedure

(SDCCH/TCHF/TCHH/TCH) .................................................................... .............................................. 13-42


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13.7.5 Channel Assignment Requests in Incoming Internal Inter-Cell Handover Procedure


13.7.6 Channel Assignment Requests in Incoming External Inter-Cell Handover Procedure


13.7.7 Channel Assignment Requests (SDCCH) ......................................................................... .............13-4613.7.8 Channel Assignment Requests (TCHF) .................................................................. .......................13-47

13.7.9 Channel Assignment Requests (TCHH).........................................................................................13-47

13.7.10 Channel Assignment Requests (TCH) ................................................................. ........................13-48

13.8 Channel Assignment Success Measurement per TRX.............................................................................13-49

13.8.1 Overview........................................................................................................................................13-49

13.8.2 Successful Channel Assignments in Immediate Assignment Procedure (SDCCH/ TCHF/TCHH)13-50

13.8.3 Successful Channel Assignments in Assignment Procedure (TCHF/TCHH) ................................13-51

13.8.4 Successful Channel Assignments in Internal Intra-Cell Handover Procedure (SDCCH/TCHF/TCHH)

..................................................................................................................................................................13-52

13.8.5 Successful Channel Assignments in Incoming Internal Inter-Cell Handover Procedure

(SDCCH/TCHF/TCHH)................................................................... ........................................................ 13-53

13.8.6 Successful Channel Assignments in Incoming External Inter-Cell Handover Procedure (SDCCH/

TCHF/TCHH)...........................................................................................................................................13-54

13.8.7 Successful Channel Assignments (SDCCH)..................................................................................13-55

13.8.8 Successful Channel Assignments (TCHF)................................................................ .....................13-55

13.8.9 Successful Channel Assignments (TCHH) ....................................................................... .............13-56

13.8.10 Successful Channel Assignments (TCH) .......................................................................... ...........13-57

13.9 Channel Assignment Failure Measurement per Cell ...................................................................... .........13-57

13.9.1 Overview........................................................................................................................................13-57

13.9.2 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Immediate

Assignment Procedure (SDCCH) ................................................................... ..........................................13-59


Assignment Procedure (TCHF) ............................................................................ ....................................13-59


Assignment Procedure (TCHH)................................................................................................................13-60

13.9.5 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Assignment

Procedure (TCHF/TCHH) ............................................................... ......................................................... 13-61

13.9.6 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Internal Intra-Cell

Handover Procedure (SDCCH).................................................................................................................13-61

13.9.7 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Internal Intra-CellHandover Procedure (TCHF/TCHH)........................................................................................................13-62

13.9.8 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Incoming Internal

Inter-Cell Handover Procedure (SDCCH) .............................................................. ..................................13-63

13.9.9 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Incoming Internal

Inter-Cell Handover Procedure (TCHF/ TCHH)............................................................... ........................13-64

13.9.10 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Incoming External

Inter-Cell Handover Procedure (SDCCH) .............................................................. ..................................13-65

13.9.11 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) in Incoming External

Inter-Cell Handover Procedure (TCHF/ TCHH)............................................................... ........................13-65

13.9.12 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) (SDCCH)......... 13-66


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13.9.13 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) (TCHF) ............13-67

13.9.14 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) (TCHH) ...........13-68

13.9.15 Channel Assignment Failures (All Channels Busy or Channels Unconfigured) (TCH) ..............13-69

13.10 Channel Assignment Concentric Cell Measurement per Cell ............................................................... 13-69

13.10.1 Overview......................................................................................................................................13-69

13.10.2 Channel Assignment Requests of Concentric Cell...................................................... .................13-70

13.10.3 TCH Assignment Requests of Concentric Cell .................................................................. ..........13-71

13.10.4 Assignment Requests of Concentric Cell in Incoming Internal Inter-Cell Handover Procedure (TCH)

..................................................................................................................................................................13-72

13.10.5 Channel Assignment Requests in Incoming External Inter-Cell Handover Procedure (TCH).....13-73

13.10.6 Channel Assignment Overflows (TCH) (Underlaid Subcell Preferred or Overlaid Subcell Preferred)

..................................................................................................................................................................13-74

13.10.7 Channel Assignment Overflows in Concentric Cell in Incoming Internal Inter-Cell Handover

Procedure (TCH).......................................................................................................................................13-74

13.10.8 Channel Assignment Overflows in Concentric Cell in Incoming External Inter-Cell Handover

Procedure (TCH).......................................................................................................................................13-75

13.10.9 Channel Assignment Overflows in Concentric Cell (TCH)......................................................... 13-76

13.10.10 Channel Assignment Overflows in Concentric Cell (SDCCH)..................................................13-77

13.10.11 Channel Assignment Overflows in Concentric Cell (TCHF) ..................................................... 13-77

13.10.12 Channel Assignment Overflows in Concentric Cell (TCHH).................................................... 13-78

13.10.13 Failed Handovers from Underlaid Subcell to Overlaid Subcell due to Busy Channels in Overlaid

Subcell .......................................................... ...................................................................... ......................13-79

13.10.14 Failed Handovers from Overlaid Subcell to Underlaid Subcell due to Busy Channels in Underlaid

Subcell .......................................................... ...................................................................... ......................13-79

13.11 Channel Assignment Queue Measurement per Cell ..................................................................... .........13-80

13.11.1 Overview......................................................................................................................................13-80

13.11.2 Maximum Queue Length ................................................................ ............................................. 13-80

13.11.3 Total Queue Length......................................................................................................................13-81

13.11.4 Sampled Queuings .............................................................. ......................................................... 13-81

13.11.5 Total Queuing Duration................................................................................................................13-81

13.11.6 Channel Assignment Queue Measurement................................................................................... 13-82

13.11.7 Mean Queue Length.....................................................................................................................13-83

13.11.8 Mean Queuing Duration...............................................................................................................13-84

13.11.9 Failed Queuings ....................................................... .................................................................... 13-84

13.12 Channel Assignment GPRS Measurement per Cell ..................................................................... .........13-84

13.12.1 Overview......................................................................................................................................13-84

13.12.2 Requests for TCH from the PCU ......................................................................... ........................13-85

13.12.3 Successful TCH Requests from the PCU.....................................................................................13-85


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Performance Counter Reference Figures

Issue 02 (2007-02-06) Huawei Technologies Proprietary xv

Figures

Figure 1-1SCCP Measurement..........................................................................................................................1-3

Figure 2-1MTP3 Measurement .............................................................. ........................................................... 2-3

Figure 3-1LAPD link measurement ............................................................. ..................................................... 3-3

Figure 10-1MSC-initiated paging procedure for CS service ........................................................................ ...10-3Figure 10-2SGSN-initiated paging procedure for CS service ...................................................................... ...10-4

Figure 10-3SGSN-initiated paging procedure for PS service..........................................................................10-5

Figure 10-4BSC-delivered CS paging procedure............................................................................................10-6

Figure 10-5CS paging procedure.....................................................................................................................10-7

Figure 10-6PS paging procedure.....................................................................................................................10-8

Figure 11-1Immediate assignment procedure................................................................................................11-46

Figure 11-2trigger points of the counters of Immediate Assignment Commands per Cell............................ 11-48

Figure 11-3Trigger points of the counters of Call Setup Indications................. ............................................ 11-50

Figure 11-4Trigger points of the counters of Rejects to Service Requests per Cell ...................................... 11-52

Figure 11-5Trigger point of the counters of Assignment Requests per Cell..................................................11-58

Figure 11-6Trigger Point of the counters of Assignment Commands per Cell .............................................. 11-59

Figure 11-7Trigger points of the counters of Completed Assignments per Cell............................................ 11-61

Figure 11-8Trigger points of the counters of Mode Modify Commands per Cell ......................................... 11-65

Figure 11-9Trigger points of the counters of Failed Mode Modify Attempts per Cell .................................. 11-67

Figure 11-10Intra-cell handover procedure .................................................................... ............................... 11-71

Figure 11-11Trigger points of the counters of Failed Intra-Cell Handovers per Cell .................................... 11-78

Figure 11-12Incoming internal inter-cell handover.......................................................................................11-89

Figure 11-13Trigger points of the counters of Failed Incoming Internal Inter-Cell Handovers per Cell ......11-96

Figure 11-14Outgoing internal inter-cell handover (excluding directed retry)............................................11-102

Figure 11-15Outgoing internal inter-cell handover (directed retry) ............................................................ 11-104

Figure 11-16Trigger points of the counters of Failed Outgoing Internal Inter-Cell Handovers per Cell

(Excluding Directed Retry) .......................................................... ................................................................ . 11-117


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xvi Huawei Technologies Proprietary Issue 02 (2007-02-06)

Figure 11-17Trigger points of the counters of Failed Outgoing Internal Inter-Cell Handovers per Cell (Directed

Retry) .................................................................. .................................................................... ...................... 11-118

Figure 11-18Incoming external inter-cell handover ................................................................... ................. 11-127

Figure 11-19Trigger points of the counters of Failed Incoming External Inter-Cell Handovers per Cell BSC. 11-134

Figure 11-20Outgoing external inter-cell handover (excluding directed retry).............. ............................. 11-141

Figure 11-21Outgoing external inter-cell handover (Directed Retry) ......................................................... 11-143

Figure 11-22Trigger points of Failed Outgoing External Inter-Cell Handovers (Excluding Directed Retry) ...11-

159

Figure 11-23Failed Outgoing External Inter-Cell Handovers (Directed Retry) .......................................... 11-160

Figure 11-24Incoming inter-RAT inter-cell handover procedure ................................................................ 11-171

Figure 11-25Incoming inter-RAT inter-cell handover procedure ......................................................

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