Service implementation method and system of IP multimedia subsystem network

Abstract

A service implementation method of an internet protocol (IP) multimedia subsystem network comprises the following steps after user equipment (UE) in the roaming state registers successfully in a visitor subscriber server (VSS) of the local IMS network through the proxy call session control function (P-CSCF) and the serving call session control function (S-CSCF) of the local IMS network: the UE sends a session invitation message to the P-CSCF and the P-CSCF sends the session invitation message to the S-CSCF; the S-CSCF sends the session invitation message to the localized IMS application server (LI AS) of the local IMS network for calling control according to the initial filter criteria (iFC) of the calling event; the LI AS carries out calling control according to the locally stored user data of the UE and routes the session corresponding to the session invitation message to the called party through the S-CSCF and the media gateway control function (MGCF) of the local IMS network after completing calling control; and after receiving the ringing message and the response message which are sent by the called party, the S-CSCF sends the messages to the UE to complete establishment of the IMS session service.

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...

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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 service message of the UE to the IMS network of the visited location. (for example, registration messages, session invitation messages) are routed to the home network, resulting in failure of IMS services; similarly, service messages (for example, session invitation messages) sent by the home network to the UE may also fail to be routed to the visited IMS network

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