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LTE_切换信令流程.docx

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编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第页共NUMPAGES52页第PAGE\*MERGEFORMAT52页共NUMPAGES\*MERGEFORMAT52页Handover1Intra-E-UTRANhandover1.1X2-basedhandover1.1.1GeneralTheseproceduresareusedtohandoveraUEfromasourceeNodeBtoatargeteNodeBusingtheX2referencepoint.IntheseprocedurestheMMEisunchanged.TwoproceduresaredefineddependingonwhethertheServingGWisunchangedorisrelocated.InadditiontotheX2referencepointbetweenthesourceandtargeteNodeB,theproceduresrelyonthepresenceofS1-MMEreferencepointbetweentheMMEandthesourceeNodeBaswellasbetweentheMMEandthetargeteNodeB.ThehandoverpreparationandexecutionphasesareperformedasspecifiedinTS36.300[5].IfemergencybearerservicesareongoingfortheUEhandovertothetargeteNodeBisperformedindependentoftheHandoverRestrictionList.TheMMEchecks,aspartoftheTrackingAreaUpdateintheexecutionphase,ifthehandoveristoarestrictedareaandifsoMMEreleasesthenon-emergencybearersasspecifiedinclause5.10.3.IftheservingPLMNchangesduringX2-basedhandover,thesourceeNodeBshallindicatetothetargeteNodeB(intheHandoverRestrictionList)thePLMNselectedtobethenewServingPLMN.WhentheUEreceivesthehandovercommanditwillremoveanyEPSbearersforwhichitdidnotreceivethecorrespondingEPSradiobearersinthetargetcell.Aspartofhandoverexecution,downlinkandoptionallyalsouplinkpacketsareforwardedfromthesourceeNodeBtothetargeteNodeB.WhentheUEhasarrivedtothetargeteNodeB,downlinkdataforwardedfromthesourceeNodeBcanbesenttoit.UplinkdatafromtheUEcanbedeliveredviathe(source)ServingGWtothePDNGWoroptionallyforwardedfromthesourceeNodeBtothetargeteNodeB.OnlythehandovercompletionphaseisaffectedbyapotentialchangeoftheServingGW,thehandoverpreparationandexecutionphasesare