LTE信令流程介绍

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1、技术文件技术文件名称：LTE信令流程介绍技术文件编号：版本：拟制审核会签标准化批准目录1概念介绍51.1控制面和用户面协议栈51.2承载概念51.3连接概念62开机附着流程72.1正常流程72.2异常流程102.2.1RRC连接建立失败102.2.2核心网拒绝112.2.3eNB未等到Initialcontextsetuprequest消息122.2.4RRC重配消息丢失或者没收到RRC重配完成消息或者eNB内部配置UE的安全参数等失败133UE发起的SERVICEREQUEST流程153.1正常流程153.2异常流程173.2.1RRC连接建立失败173.2.2核心网拒绝183

2、2.3eNB未等到Initialcontextsetuprequest消息193.2.4RRC重配消息丢失或者eNB内部配置UE的安全参数失败或者没有建立起来一个非GBR承载193.2.5eNB建立专用承载失败193.2.6eNB建立默认承载失败194网络发起的PAGING流程214.1S_TMSI寻呼214.2IMSI寻呼215TAU流程：215.1正常流程225.1.1IDLE下发起的225.1.2CONNECTED下发起的265.2异常流程266去附着276.1关机去附着276.2非关机去附着277切换流程298专用承载建立流程318.1正常流程318.2异常流程338.2

3、.1核心网拒绝338.2.2eNB本地建立失败（核心网主动发起的建立）338.2.3eNB未等到RRC重配完成消息，回复失败358.2.4UENAS层拒绝358.2.5上行直传NAS消息丢失379专用承载修改流程389.1正常流程389.1.1修改QoS399.1.2不修改QoS，只修改TFT409.2异常流程419.2.1核心网拒绝419.2.2eNB回复失败419.2.3UENAS层拒绝419.2.4上行直传NAS消息丢失4110专用承载释放流程4211空口RRC信令431概念介绍1.1控制面和用户面协议栈控制面协议栈用户面协议栈1.2承载概念EPSbearer:AnEPSb

4、eareruniquelyidentifiestrafficflowsthatreceiveacommonQoStreatmentbetweenaUEandaPDNGWE-RAB:AnE-RABuniquelyidentifiestheconcatenationofanS1BearerandthecorrespondingDataRadioBearer.WhenanE-RABexists,thereisaone-to-onemappingbetweenthisE-RABandanEPSbeareroftheNonAccessStratum.DataRadioBearer:theD

5、ataRadiobearertransportsthepacketsofanE-RABbetweenaUEandaneNB.Thereisanone-to-onemappingbetweentheE-RABandtheDataRadioBearer。（eNB）Figure13.1-1:EPSBearerServiceArchitectureDefaultBearer:TheEPSbearerwhichisfirstestablishedforanewPDNconnectionandremainsestablishedthroughoutthelifetimeofthePDNcon

6、nection.Non-GBRbearer:AnEPSbearerthatusesnetworkresourcesthatarenotrelatedtoaguaranteedbitrate(GBR)value.GBRbearer:relatedtoaguaranteedbitrate(GBR)value.1.3连接概念Uu（X1）:interfacebetweenanUEandE-UTRAN.S1:interfacebetweenaneNBandanEPC,providinganinterconnectionpointbetweentheE-UTRANandtheEPC.UE-a

7、ssociatedlogicalS1-connection:TheUE-associatedlogicalS1-connectionusestheidentitiesMMEUES1APIDandeNBUES1APIDaccordingtodefinitionin[23.401].ForareceivedUEassociatedS1-APmessagetheMMEidentifiestheassociatedUEbasedontheMMEUES1APIDIEandtheeNBide