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This paper proposed a two-tier location management mechanism(TTLM)by improving the currentregistration mechanism(CR)in IP Multimedia Subsystem(IMS).The TTLM includes the visited networkregistration and the home network registration,in which the visited network registration is responsible forre-registration in IMS.When subscriber roams,the location information of home network will be updatedby the visited network based on the change of user equipment(UE)’ s IP address.Therefore the TTLMcan reduce the times of IMS registration signaling.Using the proposed analytical model,the performanceof the CR and the proposed TTLM were investigated.After the performance analysis of CR and TTLM byusing proposed analytical model,the cost of CR in IMS could significantly be reduced theoretically andalso was proven by simulation experiments.
This paper proposed a two-tier location management mechanism (TTLM) by improving the current registration mechanism (CR) in IP Multimedia Subsystem (IMS). The TTLM includes the visited network registration and the home network registration, where the the visited network registration is responsible forre -registration in IMS.When subscriber roams, the location information of home network will be updated by the visited network based on the change of user equipment (UE) ’s IP address.Therefore the TTLMcan reduce the times of IMS registration signaling. Using the proposed analytical model, the performance of the CR and the proposed TTLM were investigated. After the performance analysis of CR and TTLM byusing proposed analytical model, the cost of CR in IMS could significantly be reduced theoretically and therefore was proven by simulation experiments.