• Author / Uploaded
• AsadKhan

Citation preview

文档名称

文档密级

Call Drop Analysis Guide

1. Relationship of different counters

CS call drop counter Normal call terminate times Call drop times

VS.RAB.NormRel.AMR VS.RAB.AbnormRel.AMR

For call drop, below counter describe the reasons:

Main counter VS.RAB.AbnormRel.CS.RF

Other reason

Sub counter VS.RAB.AbnormRel.CS.RF.SRBReset VS.RAB.AbnormRel.CS.RF.ULSync VS.RAB.AbnormRel.CS.RF.UuNoReply VS.RAB.AbnormRel.CS.OM VS.RAB.AbnormRel.CS.Preempt VS.RAB.AbnormRel.CS.UTRANgen VS.RAB.AbnormRel.CS.IuAAL2 VS.RAB.AbnormRel.CS.OLC

PS call drop counter VS.RAB.AbnormRel.PSR99 VS.RAB.NormRel.PSR99 VS.RAB.AbnormRel.PS VS.RAB.NormRel.PS

Main counter VS.RAB.AbnormRel.PS.RF

Other reason

2015-3-8

PS R99 drop times Normal call terminate times PS drop times(including R99 and HSDPA) Normal call terminate times

Sub-counter VS.RAB.AbnormRel.PS.RF.SRBReset VS.RAB.AbnormRel.PS.RF.ULSync VS.RAB.AbnormRel.PS.RF.UuNoReply VS.RAB.AbnormRel.PS.RF.TRBReset VS.RAB.AbnormRel.PS.GTPULoss VS.RAB.AbnormRel.PS.OM VS.RAB.AbnormRel.PS.Preempt VS.RAB.AbnormRel.PS.OLC

华为机密，未经许可不得扩散

第 1 页, 共 3 页

文档名称

文档密级

2. Common Reason Call drop for abnormal reasons Failure reason VS.RAB.AbnormRel.CS.OM VS.RAB.AbnormRel.CS.Preempt VS.RAB.AbnormRel.CS.UTRANgen VS.RAB.AbnormRel.CS.IuAAL2 VS.RAB.AbnormRel.CS.OLC VS.RAB.AbnormRel.PS.GTPULoss

Common reason Caused by some risk operation Check whether congestion Check alarms Check IUCS transmission configuration and alarm. Check RTWP / congestions Check IUPS transmission alarms

For RF reasons: VS.RAB.AbnormRel.CS.RF.SRBRes

Check missing neighbors, alarms, coverage

VS.RAB.AbnormRel.CS.RF.ULSync VS.RAB.AbnormRel.CS.RF.UuNoRe

UL limited, check RTWP, check UE TX power Check missing neighbor, coverage

et ply Optimization SOP for RF reason call drops 1. check alarms 2. Using Nastar to check missing neighbors/ pilot pollution 3. Using the Naster to check the coverage of the cells. How to solve the call drops if the cell located in weak coverage area/network edge? 1. Identify whether RF tuning is required or not (if some area a lot sites around but still coverage not good then RF tuning is required) 2. Modify the handover threshold/cell reselection parameters, let UE come to 2G quickly when 3G coverage become bad. 3. If UL limited, change the CPICH power or down tilt.

MML reference for Call drop optimization: MOD UCELLSELRESEL: CellId=13041, QualMeas=CPICH_ECNO, QrxlevminExtSup=FALSE, IdleSintrasearch=7, SsearchRat=4, NonhcsInd=NOT_CONFIGURED; UE will do intra-cell reselection when 3G EcIo is below -4dB, will do inter-RAT cell reselection when 3G EcIo is below -10dB. ADD UCELLINTERRATHOCOV: CellId=13041, InterRatReportMode=PERIODICAL_REPORTING, InterRATCSThd2DEcN0=-10, 2015-3-8

华为机密，未经许可不得扩散

第 2 页, 共 3 页

文档名称

文档密级

InterRATCSThd2FEcN0=-8, InterRATCSThd2DRSCP=-95, InterRATCSThd2FRSCP=-92; UE will start compress mode when 3G EcIo is below -10 or RSCP is below -92. MOD UPCPICHPWR: CellId=13451, MaxPCPICHPower=370, MinPCPICHPower=320; MOD UCELL: CellId=13451, PCPICHPower=340; Change the Cell CPICH power from 36dBm to 34dBm.

2015-3-8

华为机密，未经许可不得扩散

第 3 页, 共 3 页