本文分析了GPRS系统存在的问题 ,阐述了GPRS核心网向第三代移动核心网演进的必然。讨论了GPRS系统核心网向 3G系统核心网 (全IP网络 )的演进采用的演进策略 ,介绍了全IP网络的由来和特点及全IP核心网络的参考结构 ,并对全IP核心网络的参考结构的功能进行了描述 This article analyzes the problems existing in the GPRS system and expounds the inevitable evolution of the GPRS core network to the third generation mobile core network. This paper discusses the evolution strategy of the evolution of the GPRS system core network to the 3G system core network (all-IP network), introduces the origin and characteristics of the all-IP network and the reference structure of the all-IP core network, and analyzes the reference structure of the all-IP core network The function is described