Method and system for realizing emergency call

Abstract

The invention provides method and system for realizing an emergency call. For a position where an SAE (System Architecture Evolution) network is arranged, the service adopts an SUPL (Security User Plane Location) technique, when UE is accessed to the emergency call initiated by the SAE network, as position query is indicated to be used for the emergency call, the UE receives notice of initializing a user plane and determines that positioning bearing serves the emergency call, thereby initializing the establishment of emergency positioning bearing. Therefore, the access of the emergency call of the SAE network to the UE in a restricted mode is achieved. Furthermore, as the positioning bearing serves the emergency call specially, when the UE which initializes the emergency call is moved from a non-restricted area to a restricted area, the emergency positioning bearing is not released, and the continuity of the emergency call is ensured.

Description

technical field [0001] The present invention relates to IP Multimedia Subsystem (IMS, IP Multimedia Core Network Subsystem) domain emergency call technology, in particular to a user terminal (UE) access to System Long Term Evolution (SAE) when using User Plane Location Service (SUPL) technology ) method and system for implementing an emergency call under a network. Background technique [0002] IMS is the core of the new-generation communication network. IMS adopts the Session Initiation Protocol (SIP, Session Initiation Protocol) system. SIP stipulates that communication has nothing to do with access, and has the ability to separate various media service control functions from bearer capabilities, and to separate calls and sessions. Features such as separation of application and service, separation of business and network, and integration of mobile network and Internet services. [0003] Because IMS has nothing to do with access, the emergency service (EMC, Emergency Call)...

AI Technical Summary

Problems solved by technology

[0011] 1. The UE has a valid universal integrated circuit card (UICC, Universal Integrated CircuitCard), is a legal IMS user, and has a legal user identity in the HSS, but there are certain service restrictions, such as: restricted services in roaming areas, The current arrears are not allowed to initiate normal calls, and services are restricted in specific cells or routing areas (Track Area), etc.

[0012] 2. The UE has a valid UICC card, but the IMSI recorded on the card is invalid in the HSS

[0013] 3. The UE does not have a valid UICC card, and of course there is no IMSI

[0028] If the location service deployed by an SAE network adopts SUPL technology, when the UE accesses the SAE network and initiates an emergency call, the problem in the creation process of the bearer used for positioning is that the positioning bearer cannot be created at all in some cases.

However, in the restricted mode, SMS and WAP messages cannot be sent to the UE due to service restrictions. Therefore, when the location service deployed by the SAE network adopts SUPL technology, the UE in the restricted mode can access the SAE network. emergency call is not possible

[0029] Even if the UE is in the unrestricted mode (normal mode), the following problem may occur when the SUPL technology is used to serve the emergency call: even if the UE can create a bearer for positioning, the bearer is not identified as emergency (ie Quality of service, priority, etc. are not marked as urgent), so that if the UE moves from a non-restricted area to a restricted area, all non-emergency bearers will be released, that is, the location serving the emergency call at this time Bearers (non-emergency bearers) will also be considered as non-emergency bearers and released

It can be seen that when the location service deployed by the SAE network adopts the SUPL technology, if the UE that has initiated an emergency call moves from a non-restricted area to a restricted area, the continuity of the location service required under the emergency call cannot be guaranteed. sex, resulting in the failure of emergency call switching

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