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UTMSRAU流程整理相关知识点:MS如何确认是否需要进行RAU过程?第一步,MS通过比较小区标识和自身存储的小区标识是否一致,来确定是否进入新小区;第二步,MS通过比较MM存储的RAI和网络中收到的RAI是否一致,来确定RAU是否完成。MS如何获取到小区标识和RAI信息?情况1:RRC连接状态,服务RNC通过RRC层的“MM消息”来通知MSRAI和小区标识;情况2:RRC空闲状态,MS通过RRC层的系统广播信息获得RAI和小区标识。场景:1.MS处于PMM-CONNECTED状态,或者SGSN内的路由区更新,并且MS处于PMM-CONNECTED状态(会触发下图中信令3,4,这个过程目的是得到PDP上下文序列号),SRNS收到请求会停止发送下行PDUs到MS。信令流程:(1,3,4,6,8,9,21,22)PS:我理解,这种情况下就是MS有业务在进行,RAU流程会涉及到与SRNs进行交互的一些信令。2.SGSN间的路由更新,MS处于PMM-IDLE状态(触发下图中信令2)。信令流程:(1,2,5,6,7,11,12,13,14,17,18,19,20,21,22)总体信令流程:MS新SRNS旧SRNS新SGSN旧SGSNGGSNHLR1.RouteingAreaUpdateRequest2.SGSNContextRequest3.SRNSContextRequest4.SRNSContextResponse5.SGSNContextResponse6.SecurityFunction7.SGSNContextACK8.SRNSDATAForwardCommand9.ForwardPackets10.ForwardPackets11.UpdatePDPContextRequest12.UpdatePDPContextResponse13.UpdateLocation14.CancelLocation15.IuReleaseCommand16.IuReleaseComplete17.CancelLocationAck18.InsertSubscriberData19.InsertSubscriberDataAck20.UpdateLocationAck21.RouteingAreaUpdateAccept22.RouteingAreaUpdateComplete信令中消息的关键字段:1.RouteingAreaUpdateRequest:P-TMSI;oldRAI;oldP-TMSISignature;UpdateType(路由区更新触发;周期性路由区更新定时器触发;RA/LA联合更新;附带IMSI附着的RA/LA联合附着);followonrequest;Classmark;DRXParameters;MSNetworkcapability2.SGSNContextRequest:MS的P-TMSI和P-TMSISignature4.SRNSContextResponse:IMSI,GTP-SNDs,GTP-SNUs,PDCP-SNUs5.SGSNContextResponse:MMContext,PDPContexts,NegotiatedEvolvedARP7.SGSNContextACK:作用于SGSN间的RAU,旧SGSN收到ACK后会在上下文中标识GGSN,HLR中消息非法8.SRNSDATAForwardCommand:RABID,TransportLayerAddress,IuTransportAssociation9.ForwardPackets:GTPPDUs11.UpdatePDPContextRequest:newSGSNAddress,QoSNegotiated,NegotiatedEvolvedARP,TunnelEndpointIdentifier,servingnetworkidentity,CGI/SAI,RATtype,MSInfoChangeReportingsupportindication,NRSN12.UpdatePDPContextResponse:TunnelEndpointIdentifier,ProhibitPayloadCompression,APNRestriction,MSInfoChangeReportingAction,CSGInformationReportingAction,BCM,NegotiatedEvolvedARP13.UpdateLocation:SGSNNumber,SGSNAddress,IMSI,IMEISV,HomogenousSupportofIMSOverPSSessions14.CancelLocation:IMSI,CancellationType18.InsertSubscriberData:IMSI,subscriptiondata19.InsertSubscriberDataAck:IMSI20.UpdateLocationAck:IMSI21.RouteingAreaUpdateAccept:P-TMSI,VLRTMSI,P-TMSISignature,IMSvoiceoverPSSessionSupportedIndication,EmergencyServiceSupport
本文标题:UTMSRAU流程学习整理
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