Identifying the Agents

2G KPIs AnalysisCall Setup Success Rate (CSSR) Prepared by Muhieddine Alqousi1/17/20151

1Call setup message flow chart.Accessibility KPIs definitions and FormulasCSSR Optimization flow chart and stepsCounters and tools to use in CSSR analysis.Practicing CSSR analysis on real cases

ideas to discussPrepared by Muhieddine Alqousi1/17/20152

2 Originating Call setup message Flow

Call setup message flow chartPrepared by Muhieddine Alqousi1/17/20153

3Random Access Success Rate

This formula reflects the accessibility on the RACH Channel:

Accessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/17/20154

Successfully received Channel RequestsTotal Received Channel Requests

100 *4RACH failures Counters1/17/2015Prepared by Muhieddine Alqousi5

Function subsetCounter NameCall MeasurementL3189I:Discarded Channel RequestsCall MeasurementL3188B:MSG CCCH LOAD IND (RACH) Messages Sent on Abis InterfacePaging MeasurementA334:Number of Failures to Decode the Code Streams on the RACHPaging MeasurementA336:Number of Successes in Decoding the Code Streams on the RACHPaging MeasurementA349A:RACH Failures (Too High TA)Paging MeasurementA333:Average Undecodable Level in the Code Streams on the RACH5SDCCH Seizure Success Rate

This formula reflects the ability to seize SDCCH Channel :

Accessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/17/20156

CA301J:Immediate Assignment Commands (Circuit Service)CA300J:Channel Requests (Circuit Service)

100 *6Immediate Assignment Counters1/17/2015Prepared by Muhieddine Alqousi7

Function subsetCounter NameCall MeasurementCR330A:Channel Activation Attempts in Immediate Assignment ProcedureCall MeasurementCR330B:CHAN ACTIV NACK Messages Sent by BTS in Immediate Assignment ProcedureCall MeasurementCR330C:Channel Activation Timeouts in Immediate Assignment ProcedureCall MeasurementA3010:Immediate Assignment Commands (SDCCH)Call MeasurementA3017:Immediate Assignment Commands (TCHF)Call MeasurementA3018:Immediate Assignment Commands (TCHH)Call MeasurementA302J:Rejects to Immediate Assignments (Circuit Service)Call MeasurementCA301J:Immediate Assignment Commands (Circuit Service)7Immediate Assignment Success RateAccessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/18/20158

CA303J:Call Setup Indications (Circuit Service)CA300J:Channel Requests (Circuit Service)

100 *8Accessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/17/20159

Function subsetCounter NameChannel Seizure Measurement per TRXR4400A:Attempted Immediate Assignments (SDCCH)Channel Seizure Measurement per TRXR4409A:Attempted Immediate Assignments (TCH)Channel Seizure Measurement per TRXR4400B:Successful Immediate Assignments (SDCCH)Channel Seizure Measurement per TRXR4409B:Successful Immediate Assignments (TCH)Channel Seizure Measurement per TRXCR440A:Attempted Immediate AssignmentsChannel Seizure Measurement per TRXCR440B:Successful Immediate AssignmentsChannel Assignment Success Measurement per TRXR4110A:Successful Channel Assignments in Immediate Assignment Procedure (SDCCH)Channel Assignment Success Measurement per TRXR4117A:Successful Channel Assignments in Immediate Assignment Procedure (TCHF)Channel Assignment Success Measurement per TRXR4118A:Successful Channel Assignments in Immediate Assignment Procedure (TCHH)Immediate Assignment Measurement per CellCA303J:Call Setup Indications (Circuit Service)Immediate Assignment Measurement per CellCA304:Call Setup Indications Timed Out9TCH Seizure Success RateAccessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/18/201510

K3013A:Successful TCH Seizures (Traffic Channel)K3010A:TCH Seizure Requests (Traffic Channel)100 *10TCH Assignment Success RateAccessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/18/201511

CA313:Successful AssignmentsCA310:Assignment Requests100 *11Accessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/18/201512

Function subsetCounter NameAssignment Measurement per CellA3129E:Failed Assignments (CIC Unavailable)Assignment Measurement per CellA3129F:Failed Assignments (CIC Allocated)Assignment Measurement per CellA3129G:Failed Assignments (A Interface Failure)Assignment Measurement per CellA3129H:Failed Assignments (Clear Commands Sent By MSC)Assignment Measurement per CellA3129B:Failed Assignments (First Assignment, Terrestrial Resource Request Failed)Assignment Measurement per CellCA312:Failed Assignments (Channel Unavailable)Assignment Measurement per CellA312F:Number of Assignment Failures (No Abis Resource Available)Assignment Measurement per CellA3129S:Failed Assignments (Requested Speech Version Unavailable)Assignment Measurement per CellA3169A:Failed Assignments (Um Cause)Assignment Measurement per CellA3129T:Failed Assignments (No Ater Resource Available)Channel Activation Measurement per CellCR331A:Channel Activation Attempts in Assignment ProcedureChannel Activation Measurement per CellCR331C:Channel Activation Timeouts in Assignment ProcedureChannel Seizure Measurement per TRXR4419A:Attempted Assignments (TCH)Channel Seizure Measurement per TRXR4419B:Completed Assignments (TCH)Channel Assignment Success Measurement per TRXR4117B:Successful Channel Assignments during Assignment (TCHF)Channel Assignment Success Measurement per TRXR4118B:Successful Channel Assignments during Assignment (TCHH)Channel Assignment Success Measurement per TRXCR4117:Successful Channel Assignments (TCHF)Channel Assignment Success Measurement per TRXCR4118:Successful Channel Assignments (TCHH)12Call Setup Success Rate

Accessibility KPIs definitions and FormulasPrepared by Muhieddine Alqousi1/18/201513

Immediate Assignment SR%100-SDCCH Drop Rate%TCH Assignment SR %13CSSR Optimization flow chartPrepared by Muhieddine Alqousi1/17/201514

14

Sheet1

CSSR Is Degraded?Immediate Assignment Is degraded?SDCCH Drop Is Degraded?TCH Assignment Is degraded?SDCCH is congested?1.Check Immediate Assignment Per TRX for the TRXs that contains SDCCH.

2.Check the DL/UL Quality for the TRX that contains the SDCCH Channel.

3.Check Unbalance, Alarms and Main/Diversity difference to make sure no HW Issue

1. Check if Number of SDCCH Timeslots is Missing?

2.Check if Dynamic SDCCH Feature is activated? SDDYN

3.Check SDCCH Availability.

4.Check Sudden increase in Channel Requests.

5.Check LAU PercentageSDCCH Drop analysis is similar to TCH Drop analysis:

1.Check Interference possibility.2.Check HW Issue Possibility.3.Check Transmission Issues Possibility4.Check External Interference issues.5.Check Coverage Issues

TCH is congested?1.Check TCH Assignment per TRX.2.Check if the assignment failure is caused by Quality or Hardware Issue.3.Check Interference possibility , Transmission instability, Hardware Alarms ..etc

1. Check if Traffic increased Suddenly.2.Check TCH Utilizatio Rate.3.Check if HR is activated.4.Check TRX Availability5.check Comgestion on other interfaces.