low paging during busy hours

7/31/2019 Low Paging during busy hours

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Customerâscomplain:pagingSRofBSC6000isabout50%atbusyhour.CustomercalculatespagingSRbyMSCstatistic.ThepagingSRisabout95%atnon-busyhour.PagingSR=(A+B)/C.WhereA,B,C&Dare............A=NumberofFirstPagingResponsesfromAInterfaceB=NumberofRepeatedPagingResponsesfromAInterfaceC=NumberofFirstPagingstoAInterfaceD=NumberofRepeatedPagingstoAInterfaceAlarmInformation:NoAlarm.CauseAnalysis:Pagingmessagehavingthreepathsandanypathcanleadtheproblem.1.BTS------MS......someRNPproblemcanleadpagingproblem.2.BSC------BTS.....Abis-interfaceoverloadhappened,overloadontheGEIUB/GOIUB,oronthelink.3.MSC------BSC.....A-interfaceoverloadhappened.HandlingProcess:1.CheckedBSC-----BTSpath(Abisinterface).OnthisstagewewillcheckarateofmissedpagingmessagesatBSC<->BTSpath(Abisinterface).WewelloperatewithtwoBSCcountersA0300andA032.CounterA0300.Thiscounterprovidesthetotalnumberofpagingmessagesreceive

dbytheBSCfromtheMSC,includingthenumberofrepeatedpagingmessages.CounterA032.ThiscounterprovidedthetotalnumberofdeliveredPagingMessagestoBTSforCSService.TherateofmissedpagingmessagesonAbisinterface=A032/A0300.Result:A032/A0300isabout99.9%atbusyhour.SowecanmakeconclusionthatthereisnotanypagingmissingonAbisinterface.3.CheckedMSC<->BSCpath(Ainterface).OnthisstagewewillcheckarateofmissedpagingmessagesatMSC<->BSCpath(Ainterface).WewelloperatewithoneBSCcounterA0300andtwoMSCcountersdenotedbefore(CandDcounters).TheNumberofmissedpagingmessagesonA-interface=A0300/(C+D).Result:A0300/(C+D)isabout50%atbusyhour.SowecanmakeconclusionthatthereisbigpagingmissingonAinterface.

3.WefoundreasonwhythereispagingmessagemissingAinterface.ThereisoneBSC-relatedparameterrelatedwithmaximumnumberofpagingmessagesthattheBSCcanprocessovertheA.PGMAXMSGNUMINPERIODismaximumCSpagingMessageNumberinpagingstateperiod.PGSTATPERIODispagingstateperiod.ForourNEthesettingisPGMAXMSGNUMINPERIOD=160,PGSTATPERIOD=1000ms.Inotherwords,BSCcanprocess160pagingmessagespersec.AccordingtoMSCstatistic(C+D)wecanseethatMSCsentabout1millionpagingmessagestoBSCperbusyhour.LetâsestimatePGMAXMSGNUMINPERIODisreasonableornot.1000000/(60*60)=277[pagingmessages/sec].SowecanmakeconclusionthatcurrentsettingPGMAXMSGNUMINPERIODisunreasonable(currentsettingis160,butaccordingtotrafficsettingmustbetwicebigge

r-277).SuggestionsandSummary:SetPGMAXMSGNUMINPERIODtoreasonablevalueWesetPGMAXMSGNUMINPERIODfrom160to300.Result:problemwassolvedafterPGMAXMSGNUMINPERIODadjustment.NowPagingSRcalculatedfromMSCsideisabout95%atbusyhour.