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分析题：1.ThereisaroamingcustomerfromHongKong,everytimehecomestomainland,hismobilewillcamponUnicom’snetworkfirst.ButhecanswitchthenetworktoCMCCmanuallyafterthemobile’sautomaticPLMNselection.Pleaseanalysethepossiblereason,andgiveoutatleast2solutions.(Pleasealsogiveoutthebackgroundsupporttheoryforyourreasons)可能原因1，机场移动信号覆盖较差低于-85dBm，但联通信号高于－85dBm；或者移动和联通电平都低于－85dBm，但是移动信号比联通还弱；可能原因2，机场移动和联通的信号都很强，但是由于用户原来在香港关机时使用的BCCH落在联通频点内方案1，把机场降落跑道的覆盖增强，把BCCH移动可用的最高端频点方案2，让用户把移动加入其优先选网列表中2.Inyouropinion,whatisapossibleexplanationforthedropratebeingsometimeshigheratnight?Howtoimproveit?Reason:lowerDL/ULwirelesssignalstrengthworsespeechqualitybecauselowC/Iinlowsignalstrength.moreemergencyhandoverinindoorarearesultinmorehandoverlostbadfrequencyplanningandneighborrelationplanning,suchaslessneighborrelationandSolution:improvesignalstrengthbyaddindoorsite,orrepeater,oraddnewmacrositeandsoon.ImproveC/Ibychangepowerandpowercontrolparameter.carefulcheckneighborrelationbycollectingnighthourdata,addnecessaryneighborrelationfinetuningfrequency,reducefrequencyinterferencereducenotneededhandover.IncreaseACCMIN3.WhenBTSoccur“Rxdiversitylost”alarm,whatarethemainreasonandhowtoimproveit?Reason:Antennafeederwrongconnected.RBSlinewrongconnected.DU/TRUhardwareproblem.驻波比问题Solution:Drivetesttoconfirmwhichcellshavewrongcoverageproblemtolocatedtheproblemcell.Ifithavewrongcoverage,ChecktheantennadirectionCheckallthejumpersandfeedersfromBTStoantennaandCheckallthelinesandconnectorsinBTSIfnowrongcoverageproblem,plscheckTRUproblemorantennaRXproblem.4.PleasecompletethefollowingsignalingprocedureA.SubsequentHOfromMSCBtoMSCB’,MSCAisanchorMSCSubsequentHOEndofthecallRELEASEMAP-SEND-END-SIGNALresponseBSSVLR-BMSC-B’VLR-B’BasicHOMSC-AMSC-BMAP-PREPARE-SUB-HOrequestMAP-PREPARE-HOrequestMAP-ALLOCATE-HO-NorequestMAP-SEND-HO-REPORTrequestMAP-PREPARE-HOresponseIAMMAP-SEND-HO-REPORTresponseACMMAP-PREPARE-SUB-HOresponseA-HO-COMMANDA-HO-DETECTMAP-PROCESS
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