Method for informing IMS about belonging network of PDN GW allocated to UE

Abstract

The invention provides a method for informing IMS about belonging network of PDN GW allocated to UE. The method comprises the following steps that: user equipment UE is attached to a system architecture evolution SAE network; the SAE network establishes an IP bearer for the UE and returns the information of a belonging network of a packet data network gateway PDN GW allocated to the UE to the UE; the UE receives the information of the belonging network of the PDN GW and then stores the information in a local position; the UE carries the information of the belonging network of the PDN GW to an IP multimedia subsystem IMS network through session initiation protocol SIP signaling; and the IMS network judges the belonging network of the PDN GW according to the information of the belonging network of the PDN GW. Through the method provided by the invention, the IMS network can be informed whether a current media routing mode of the UE is an LBO mode, and converts the media routing mode of the UE from the LBO mode to an HR mode according to need.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, relates to a method in which a UE (User Equipment, user equipment) accesses a network through LTE / SAE (Long term Evolution / System Architecture Evolution, long term evolution / system architecture evolution) and registers with a home network in a roaming situation. In the IMS (IP Multimedia Core Network Subsystem, IP Multimedia Subsystem) network of the network, the method for the IMS to learn the network to which the PDN GW (Packet Data Network Gateway, Packet Data Network Gateway) allocated for the UE belongs. Background technique [0002] The IMS system is the core of the new-generation communication network. Its notable feature is that it adopts the Session Initiation Protocol (SIP) system, and communication has nothing to do with access. Session separation, application and service separation, business and network separation, and mobile network and Internet business integ...

AI Technical Summary

Problems solved by technology

During the registration process, the UE will notify the network number of the network accessed by the IMS, but the network accessed by the UE is not necessarily the same as the PDN network that allocates the PDN GW for the UE. Therefore, the IMS service layer (specifically, It refers to P-CSCF, S-CSCF) does not know which network the UE's PDN GW belongs to (whether it is the visited network or the home network), so it is impossible to know whether the UE's current media routing mode is LBO mode

[0056] Furthermore, under the single-IP LBO architecture, since the IMS layer (P-CSCF / S-CSCF) does not know whether the egress of the UE's media route (that is, the PDN GW allocated to the UE) is located in the visited network or the home network, the When dealing with special requirements (such as the home network requires lawful interception), it will not be possible to determine whether the media routing mode should be converted from LBO mode to HR mode

[0057] It can be seen that in the prior art, when the IMS service layer requires media routing to be converted from the LBO mode to the HR mode, the IMS service layer cannot know which network the UE's PDN GW is allocated (whether it is allocated by the visited network or the home network). ), there is a lack of basic judgment information, so it is impossible to know whether the current media routing mode is LBO mode, and it is impossible to request the conversion of the media routing mode

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