LTE信令流程介绍-【最全】

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技术文件名称：LTE信令流程介绍 技术文件编号： 版 本：

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目 录

1 概念介绍 .............................................................................................................................................. 4 1.1 控制面和用户面协议栈 ............................................................................................................... 4 1.2 承载概念 ....................................................................................................................................... 4 1.3 连接概念 ....................................................................................................................................... 5 2开机附着流程 ....................................................................................................................................... 6 2.1正常流程 ........................................................................................................................................ 6 2.2异常流程 ........................................................................................................................................ 9 2.2.1 RRC连接建立失败 ................................................................................................................ 9 2.2.2核心网拒绝 ........................................................................................................................... 10 2.2.3 eNB未等到Initial context setup request消息 ..................................................................... 11 2.2.4 RRC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 ............................................................................................................................................ 12

3 UE发起的SERVICE REQUEST流程 ........................................................................................... 14 3.1正常流程 ...................................................................................................................................... 14 3.2异常流程 ...................................................................................................................................... 16 3.2.1 RRC连接建立失败 .............................................................................................................. 16 3.2.2核心网拒绝 ........................................................................................................................... 17 32.3 eNB未等到Initial context setup request消息 ...................................................................... 18 3.2.4 RRC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 ....................................................................................................................................... 18 3.2.5 eNB建立专用承载失败 ....................................................................................................... 18 3.2.6 eNB建立默认承载失败 ....................................................................................................... 18 4网络发起的PAGING流程 ............................................................................................................... 20 4.1 S_TMSI寻呼 ............................................................................................................................... 20 4.2 IMSI寻呼 ..................................................................................................................................... 20 5TAU流程： ......................................................................................................................................... 20 5.1正常流程 ...................................................................................................................................... 21 5.1.1 IDLE下发起的 ..................................................................................................................... 21 5.1.2 CONNECTED下发起的 ...................................................................................................... 25 5.2异常流程 ...................................................................................................................................... 25 6去附着 ................................................................................................................................................. 26 6.1 关机去附着 ................................................................................................................................. 26 6.2 非关机去附着 ............................................................................................................................. 26 7切换流程 ............................................................................................................................................. 28 8专用承载建立流程 ............................................................................................................................. 30 8.1正常流程 ...................................................................................................................................... 30 8.2异常流程 ...................................................................................................................................... 32

8.2.1 核心网拒绝 .......................................................................................................................... 32 8.2.2 eNB本地建立失败（核心网主动发起的建立） ............................................................... 32 8.2.3 eNB未等到RRC重配完成消息，回复失败 ...................................................................... 34 8.2.4 UE NAS层拒绝 .................................................................................................................... 34 8.2.5 上行直传NAS消息丢失 ..................................................................................................... 36 9专用承载修改流程 ............................................................................................................................. 37 9.1正常流程 ...................................................................................................................................... 37 9.1.1 修改QoS .............................................................................................................................. 38 9.1.2 不修改QoS，只修改TFT .................................................................................................. 39 9.2异常流程 ...................................................................................................................................... 40 9.2.1 核心网拒绝 .......................................................................................................................... 40 9.2.2 eNB回复失败 ....................................................................................................................... 40 9.2.3 UE NAS层拒绝 .................................................................................................................... 40 9.2.4 上行直传NAS消息丢失 ..................................................................................................... 40 10专用承载释放流程 ........................................................................................................................... 41 11空口RRC信令................................................................................................................................. 42