low paging during busy hours

Customerâscomplain: pagingSRofBSC6000isabout50%atbusyhour. CustomercalculatespagingSRbyMSCstatistic. ThepagingSRisabout95%atnon-busyhour. PagingSR=(A+B)/C. WhereA,B,C&Dare............ A=NumberofFirstPagingResponsesfromAInterface B=NumberofRepeatedPagingResponsesfromAInterface C=NumberofFirstPagingstoAInterface D=NumberofRepeatedPagingstoAInterface AlarmInformation: NoAlarm. CauseAnalysis: Pagingmessagehaving threepathsandanypa thcanleadtheproblem. 1.BTS------MS......someRNPproblemcanleadpagingproblem. 2.BSC------BTS.....Abis-interfaceoverloadha ppened,overloadontheG EIUB/GOIU B,oronthelink. 3.MSC------BSC.....A-interfaceoverloadhappened. HandlingProcess: 1.CheckedBSC-----BTSpath(Abisinterface). Onthisstagewewill checkarateofmissedpagingmessagesatBSC<->BTSpath( Abisinterface).Wewe lloperatewithtwoBSC countersA0300andA032. CounterA0300.Thiscounterprovidesthetotal numberofpagingmessage sreceive dbytheBSCfromthe MSC,includingthenumbe rofrepeatedpagingmess ages. CounterA032.Thiscounterprovidedthetotal numberofdeliveredPagingMessage stoBTSforCSService. TherateofmissedpagingmessagesonAbisinterface=A032/A0300. Result:A032/A0300is about99.9%atbusyhour .Sowecanmakeconclus ionthat thereisnotanypagingmissingonAbisinterface. 3.CheckedMSC<->BSCpath(Ainterface). Onthisstagewewill checkarateofmissedpagingmessagesatMSC<->BSCpath( Ainterface).Wewell operatewithoneBSCcou nterA0300andtwoMSCco untersde notedbefore(CandDcounters). TheNumberofmissedp agingmessagesonA-inte rface=A0300/(C+D). Result:A0300/(C+D)is about50%atbusyhour .Sowecanmakeconclusionthatt hereisbigpagingmissingonAinterface. 3.Wefoundreasonwhy thereispagingmessage missingAinterface. ThereisoneBSC-relat edparameterrelatedwit hmaximumnumberofpagin gmessage sthattheBSCcanprocessovertheA. PGMAXMSGNUMINPERIODis maximumCSpagingMessa geNumberinpagingstate period. PGSTATPERIODispagingstateperiod. ForourNEthesetting isPGMAXMSGNUMINPERIOD =160,PGSTATPERIOD=1000ms.Ino therwords,BSCcanprocess160pagingmessagespersec. AccordingtoMSCstati stic(C+D)wecanseethatMSCsentabout1millionpaging messagestoBSCperbusyhour. LetâsestimatePGMAXMSGNUMINPERIODisreasonableornot. 1000000/(60*60)=277[pagingmessages/sec]. Sowecanmakeconclusionthatcurrentsetting PGMAXMSGNUMINPERIODisu nreasonab le(currentsettingis 160,butaccordingtot rafficsettingmustbetw icebigge r-277). SuggestionsandSummary: SetPGMAXMSGNUMINPERIODtoreasonablevalue WesetPGMAXMSGNUMINPERIODfrom160to300. Result:problemwasso lvedafterPGMAXMSGNUMIN PERIODadjustment.NowPa gingSRc alculatedfromMSCsideisabout95%atbusyhour.

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7/31/2019 Low Paging during busy hours

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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.

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