"GPRS Mobility Management (GMM)

## 定义 / Definition

### English Mobility management functions specific to GPRS (General Packet Radio Service), including attach, detach, routing area update, and PDP context management. GMM is a sub-layer of the GPRS protocol stack.

### 中文 GPRS（通用分组无线业务）特有的移动性管理功能，包括附着、分离、路由区更新和PDP上下文管理。GMM是GPRS协议栈的一个子层。

## GMM 流程 / GMM Procedures

### English

流程描述 ------------ GPRS AttachUE registers to GPRS network GPRS DetachUE deregisters from GPRS network Routing Area UpdateUE moves between routing areas PDP Context ActivationActivate packet data connection

### 中文

流程描述 ------------ GPRS附着UE向GPRS网络注册 GPRS分离UE从GPRS网络注销 路由区更新UE在路由区间移动 PDP上下文激活激活分组数据连接

## 状态机 / State Machine

+------+     +------+     +------+     +------+
IDLE-->STBY-->READY-->IDLE
+------+     +------+     +------+     +------+
  空闲         待机         就绪         空闲

## 消息 / Messages

消息方向描述 ------------------ ATTACH REQUESTMS → SGSN附着请求 ATTACH ACCEPTSGSN → MS附着接受 ATTACH COMPLETEMS → SGSN附着完成 DETACH REQUESTMS → SGSN分离请求

## 交叉引用 / Cross References

- TS 24.008 - GMM procedures - TS 23.060 - GPRS architecture - Mobility Management - Session Management