EPC网络中IMS业务的本地疏导实现方式探讨

Realization of IMS Services Local Breakout in EPC Network

未来的移动通信核心网络将采用EPC作为承载,IMS作为业务控制层架构在EPC网络上为用户提供多媒体应用。在漫游的情况下,可以使用本地疏导的方式对用户的媒体数据进行路由。本文讨论了支持本地疏导的EPC漫游架构;分析了用户接入网络漫游时接入实体的选择;研究了漫游用户接入业务控制层的实现方式,比较了两种实现方式的异同点;对采用本地疏导可能会遇到的问题进行了探讨,并给出一种相对可行的解决方案建议。

EPC will be the bear network of the future Mobile Core Network. As the service control layer, IMS will provide multimedia services for the user. In the roaming cases, local breakout will be used to route the media of the user plane. A roaming architecture supporting local breakout is given in the article. The selection of the S-GW and P-GW is also being analyzed. There are two way for the user to access to the IMS network, each of it is deeply discussed in the paper, and the difference of two scheme is also discussed. At the end of the paper, the problem will be faced when deployed local breakout is being analyzed, and a way to solve the problem is given.