Service implementation method and system of IP multimedia subsystem network

Abstract

A method and system for realizing services in the IP Multimedia Subsystem(IMS) network are disclosed in the present invention. The method includes the following steps: after the User Equipment(UE) in the roaming state registers successfully in the Enhanced Mobile Switch Center (E-MSC) of the local IMS network, the UE sends the session invite message to the Serving Call Session Control Function (S-CSCF) via the Proxy Call Session Control Function(P-CSCF); the S-CSCF sends the session invite message to the E-MSC according to the main call event triggering standard of the initial Filter Criteria(iFC); the E-MSC sends the initial address message to the Public Switched Telephone Network(PSTN) which the called user belongs to according to the called number in the session invite message; after receiving the address completion message returned by the PSTN, the E-MSC sends the ring message to the UE; and after receiving the answer message of the circuit domain sent by the PSTN, the E-MSC connects the IP media carrier between the E-MSC and the UE with the Circuit Switch(CS) media carrier between the E-MSC and the PSTN, and sends the answer message of the Session Initiation Protocol(SIP) to the UE via the S-CSCF and the P-CSCF in order to complete the establishment of the IMS session service. The present invention solves the roaming problem in the original locally deployed IMS network and reduces user reduplicate investment caused by the network evolution process.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for realizing the service of an IP (Internet Protocol, Internet Protocol) multimedia subsystem network. Background technique [0002] In order to maintain the competitiveness of the 3rd Generation Partnership Project (abbreviated as 3GPP) in the field of mobile communications, 3GPP is currently working on the research on packet switched core network (Packet Switched Core, abbreviated as PS Core) and global mobile communications The evolution of the Universal Mobile Telecommunication System Radio Access Network (UTRAN) aims to enable the evolved PS Core (EPC) to provide higher transmission rates, shorter transmission delays, and support E -UTRAN (Evolved UTRAN, evolved UTRAN), GERAN (GSM EDGE radio access network, Global System for Mobile Communications Enhanced Data Rate Global System for Mobile Communications Evolution Technology Wireless Access Network), UTRAN, WLA...

AI Technical Summary

Problems solved by technology

[0011] In the case of local deployment of the IMS network, if the user roams to the IMS network of the visited location, and the intermediate network between the IMS network of the home location and the IMS network of the visited location is not deployed with an IMS network, it may not be possible to send the message of the UE ( For example, registration messages, session invitation messages) are routed to the home network, resulting in failure of IMS services; similarly, messages sent by the home network to the UE (for example, session invitation messages) may not be routed to the visited IMS network

Images