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在分析IMS(IP Multimedia Subsystem)的注册过程后,提出一种改进的位置更新注册机制.该机制采用分层位置管理的思想,让P-CSCF(Proxy-Call Session Control Function)记录UE(User Equipment)的IP地址,S-CSCF(Service-Call Session Con-trol Function)记录为该UE服务的P-CSCF的地址,不再记录UE的IP地址,使得UE在发生位置更新时,尽可能少产生注册信令,让信令尽量限制在拜访网络.优化机制同时考虑UE与P-CSCF之间的安全问题,利用已有的安全数据让新P-CSCF对UE进行认证和建立安全联盟.分析结果显示,本文提出的改进的位置更新注册机制要优于已有的一些算法.
After analyzing the registration process of IP Multimedia Subsystem (IMS), this paper proposes an improved registration mechanism of location update, which adopts the idea of hierarchical location management to enable P-CSCF to record User Equipment ), The address of the P-CSCF served by the UE is recorded by the S-CSCF (Service-Call Session Con-trol Function), and the IP address of the UE is no longer recorded, so that the UE generates as few as possible when a location update occurs Registering signaling so that the signaling is limited to the visited network as far as possible.The optimization mechanism considers the security problem between the UE and the P-CSCF at the same time and uses the existing security data to enable the new P-CSCF to authenticate the UE and establish a security association. It shows that the improved location update registration mechanism proposed in this paper is superior to some existing algorithms.