An improved registration procedure based on cache in IMS (IP Multimedia Subsystem) is proposed after the analysis of registration procedure in IMS. At the first interactive phase when UE( User Equipment) register to S-CSCF( Serving-Call Session Control Function), P-CSCF( Proxy-CSCF) caches the address information of I-CSCF(Interrogation-CSCF) which is gotten through DNS combined queries, and I-CSCF caches the address information of S-CSCF which is selected by this I-CSCF. At the second interactive phase between UE and S-CSCF, the relative entities retrieve the address information from the cache. So the registration procedure can be speeded up. Analysis result shows that the improved registration procedure is better than the standard one. Furthermore, the improved registration procedure has minor change to IMS network and can be deployed and realized easily.%在分析IMS(IP Multimedia Subsystem)的注册过程后,提出一种基于缓存的改进注册过程.在liE(User Equipment)向s-cscF(Serving-Call Session Control Function)注册的第一次交互过程中,让P-CSCF(Proxy-CSCF)缓存通过DNS组合查询得到的I-CSCF(Interrogation-CSCF)的地址信息,再让I-CSCF缓存它为用户选择的S-CSCF的地址信息.在UE与S-CSCF的第二次交互过程中,相关实体直接从缓存中提取之前保存的地址信息,以此加快用户的注册过程.分析结果显示,改进的注册过程要优于标准的注册过程.同时,它对网络的改动较小,容易部署和实现.
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