Method and system for realizing emergency session handover

Abstract

The invention provides a method and a system for realizing emergency session handover. In the method and the system, (3rd generation partnership project) 3GPP access network serving as a source access network and a target access are both uniquely provided with the same packet data network gateway (PDN GW) used for emergency handover; the 3GPP access network establishes an emergency bearing by using the PDN GW and performs an IMS emergency session on the emergency bearing; and when user equipment (UE) initializes the emergency handover from the 3GPP access network to the target access network, the target access network has a uniquely configured PDN GW for selection. Therefore, the method and the system ensure the sameness of the PDN GW used by the 3GPP access network and the target access network, ensure that the handover of an emergency section from the 3GPP access network to the target access network is realized by UE successfully, realize the continuity of the emergency session, improve service quality and improve user experience.

Description

technical field [0001] The present invention relates to IP Multimedia Subsystem (IMS, IP Multimedia Core Network Subsystem) domain emergency call technology, especially a method and system for realizing emergency session switching. Background technique [0002] With the development of a flat network architecture and the emergence of various high-speed broadband mobile access methods, an Evolved Packet System (EPS, Evolved Packet System) network as an access method in the IMS domain has been gradually applied. [0003] The 3rd Generation Partnership Project (3GPP) EPS mainly includes: Evolved Universal Terrestrial Radio Access Network (E-UTRAN, Evolved Universal Terrestrial Radio Access Network), Mobility Management Entity (MME, Mobility Management Entity), Serving Gateway (S- GW, Serving Gateway), Data Network Gateway (P-GW, Packet Data Network Gate Way, also known as PDNGW), Home Subscriber Server (HSS, Home Subscriber Server), 3GPP Authentication, Authorization and Account...

AI Technical Summary

Problems solved by technology

During emergency bearer switching, the PDN GW address selected by the target access network needs to be consistent with the PDN GW address selected by the source access network, otherwise emergency bearer update and switchover cannot be performed, and emergency switchover will fail

[0068] At present, in order to ensure the resources and reliability of emergency services, multiple PDNGW configurations are used in the 3GPP network. In this case, using the existing method for implementing emergency session handover, when the UE moves from the 3GPP network to the target access network When emergency session handover is performed on a non-3GPP network or a CDMA2000 access network, the PDN GW selected by the 3GPP access network and the target access network may be inconsistent, which will result in the failure of emergency session handover, which cannot guarantee the continuity of emergency calls, reducing service quality, seriously affecting user experience

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