Method for user terminal two stage position management by IP multimedia sub-system

Abstract

The invention provides a method used for leading an IP multimedia sub-system to carry out two-step position management on a user end (UE); the position management of UE is carried out by a two-step position management mechanism TTLM method where home network and visit network are respectively registered; the register of the visit network is used for carrying out the position management on the registered UE which is arranged in the visit network; when the UE roams, the visit network determines whether to trigger the register process of the home network according to the change situation of the IP address of the UE, thus reducing the signalling load of the IMS network. Furthermore, when the UE roams from the home network to the visit network and call-in or call-out conversation IOS event occurs, the method of the invention adopts a two-step position management mechanism TTLM method and a dynamic position updating mechanism DLU method to carry out the position management on the UE. The method of the invention solves the defects of the prior art better, effectively reduces the load of the HSS and S-CSCF, reduces the transmission quantity of the position updating signals, and improves the utilization ratio of the network resource.

Description

technical field [0001] The invention relates to a method for two-level location management of a user terminal by an IP multimedia subsystem, belonging to the technical field of mobile communication. Background technique [0002] Universal Mobile Telecommunications System UMTS (Universal Mobile Telecommunications system) is one of the main standards of the third generation of mobile communications. In the UMTS system, the purpose of introducing the IP Multimedia Subsystem IMS (IP Multimedia subsystem) is to provide mobile terminal users with voice, video , data and other multimedia services, unify the core network into an all-IP network structure, and realize the integration of fixed and mobile communication networks. [0003] Location management is one of the key technologies of the IMS network. In the IMS network, location management is mainly generated by the SIP-based REGISTER request message in the Serving-Call Session Control Function S-CSCF (Serving-Call Session Contr...

AI Technical Summary

Problems solved by technology

However, the frequent PRR process is easy to generate a large load pressure on the network, affecting the system performance and capacity of the network

[0005] However, the current registration and re-registration methods make the core network elements in the home network, such as the home subscriber server HSS (Home Subscriber Server) and the S-CSCF server, need to participate in each location registration process and location query process

As the scale of users expands and the volume of call traffic increases, the load on the HSS server and S-CSCF server will become heavier and heavier. Moreover, more location update signaling will also occupy network bandwidth and processing resources, which is very important for real-time calls, etc. business would be seriously adversely affected

At the same time, the re-registration process still requires the participation of all IMS network elements on the registration path, resulting in low utilization of network resources and inflexible mobility management

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