采用一次交互优化IMS用户注册过程

移动用户向IMS(IP Multimedia Subsystem)网络注册需要经过二次认证过程:GPRS接入认证及IMS对移动终端的认证。两者的认证过程中均采用AKA协议，它们包含很多类似的操作，增加了接入过程的延时，缺乏效率。针对IMS用户注册过程进行研究，在前人研究的基础上，通过SGSN和HSS之间的交互完成用户及网络之间的认证，避免了认证失败造成网络带宽的浪费，对IMS用户的注册过程进行了进一步优化。分析结果显示，改进后的注册过程优于先前所提出的注册过程。

Optimization in IMS Registration Procedure Using One-pass Interaction

Two authentication procedures arc essential when mobile station registers to the IMS network; the GPRS access authentication and the IMS authentication. Both of the authentication procedures perform the protocol AKA. Almost all of the operations are the same, which increase the register procedure delay. As a result, it is very inefficient.This paper investigated the performance of IMS registration procedure and proposed an optimized scheme in IMS registration procedure based on previous study. We through the interaction between SGSN and HSS completed the registration procedure between mobile station and network, which avoids the bandwidth waste when authentication fails. The result of data analysis illustrates that the performance of this optimized registration scheme is better than the primitiveone.