Method for transferring emergency service sessions, and emergency service system

Abstract

The invention provides a method for transferring emergency service sessions, and an emergency service system. The method comprises the following steps that: after UE passes LTE / SAE network access and establishes an emergency service session anchored to an EHS with a PSAP, when the session needs to be transferred to CS domain access, an MME sends a transfer request message carrying emergency-session association information to the EHS; the EHS receives the transfer request message and then interacts with a target MSC of a CS domain so as to establish CS domain bearing resources between the EHS and the target MSC for the emergency service session; the EHS finds a remote session branch of the emergency service session according to the emergency-session association information, connects the remote session branch with the CS domain bearing resources, and then tells the UE to be connected from a GERAN or a UTRAN in the CS domain, wherein the remote session branch is the bearing resources of the emergency service session, which are established between the EHS and the PSAP before transfer is performed; and the EHS is positioned in a local network of the UE.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for switching an emergency service session and an emergency service system. Background technique [0002] In order to ensure the continuity of voice services between the Circuit Switched (CS for short) domain and the IP (Internet Protocol, Internet Protocol) multimedia subsystem (IP Multimedia Core Network Subsystem, IMS for short) network, the traditional voice service continuity (Voice Call Continuity, referred to as VCC) solutions such as figure 1 shown. [0003] Among them, after the dual-mode user equipment (User Equipment, referred to as UE) is successfully registered in both the CS domain and the IMS network, when the UE initiates a voice service in the CS domain or the IMS network, the voice service is anchored to the centralized control service of the IMS network In the session service continuity application server (ServiceCentralization and Continuity Application Se...

AI Technical Summary

Problems solved by technology

[0064] (1) Since the SCC AS under the existing SRVCC architecture is in the home domain, it obviously does not meet the requirement that all relevant network elements of emergency services should be in the visited domain;

[0065] (2) Under the existing SRVCC architecture, since no card user terminal or unauthenticated user terminal needs to use IMEI (International Mobile Equipment Identity, International Mobile Equipment Identity) to initiate a call, and the ISUP message in step A208 cannot carry IMEI, IMEI cannot be used as session association information, so emergency business session switching cannot be realized

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