3GPP协议解读(三)_3GPP_23.501_23.502_ServiceRequest终端发起业务,建立完整端到端连接_(更新中)

0 引言

本文将梳理 终端(UE)发起业务请求(Service Request) 的整个流程,包括网元架构、信令流程等。

1 UE的两个状态

23.501 第5.3.3.2节

1.1 连接管理(CM)

UE发出的Service Request申请需要通过接入和移动性管理功能(Access and Mobility management Function ,AMF)的鉴权才能与网络侧进行交互,这个过程就叫做连接管理(CM)
CM用于在UE和AMF之间建立和释放控制平面信令连接。
CM-IDLE:CM空闲状态
CM-CONNECTED:CM已连接状态
这两种状态用于反应UE与AMF的NAS信令连接状态,不同UE之间的CM状态是相互独立的。

2 Service request的触发条件-Trigger

若UE需要向网络发送上行链路信令消息、用户数据、请求紧急服务回退或回应网络的寻呼请求,则需要出发Service Ruquest流程,经过AMF的鉴权后,UE或者网络侧就可以使用该流程进行交互了。
PS:如果服务间隙定时器正在运行,则UE不应从CM-IDLE发起Service Request

3 5G核心网的网元结构

在这里插入图片描述

  • UE:终端,User Equipment
  • RAN:无线接入网,Radio Access Network
  • AMF:接入和移动性管理功能,Access and Mob
The present document specifies the procedures used by the protocols for mobility management and session management between User Equipment (UE) and Mobility Management Entity (MME) in the Evolved Packet System (EPS). These protocols belong to the non-access stratum (NAS). The EPS Mobility Management (EMM) protocol defined in the present document provides procedures for the control of mobility when the User Equipment (UE) is using the Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). The EMM protocol also provides control of security for the NAS protocols. The EPS Session Management (ESM) protocol defined in the present document provides procedures for the handling of EPS bearer contexts. Together with the bearer control provided by the access stratum, this protocol is used for the control of user plane bearers. For both NAS protocols the present document specifies procedures for the support of inter-system mobility between E-UTRAN and other 3GPP or non-3GPP access networks: - For inter-system mobility between E-UTRAN and GERAN or UTRAN, this includes rules for a mapping between parameters and procedures used by the NAS protocols defined in the present document and the NAS protocols specified in 3GPP TS 24.008 [13]. - For inter-system mobility between E-UTRAN and generic non-3GPP access networks, this includes specific NAS procedures to maintain IP connectivity to the PDN Gateway and to provide parameters needed by the UE when using mobility management based on Dual-Stack Mobile IPv6 (see 3GPP TS 24.303 [14]) or MIPv4 (see 3GPP TS 24.304 [15]). The present document is applicable to the UE and to the Mobility Management Entity (MME) in the EPS. The present document is also applicable to the relay node in the EPS (see 3GPP TS 23.401 [10]).
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