Implementation method for emergency call callback and emergency call callback system

Abstract

The invention provides an implementation method for emergency call callback and an emergency call callback system. The method comprises the following steps that: a public safety answering point (PSAP) sends an emergency callback request to a proxy call session control function (PCSCF) through an emergency call session control function (ECSCF); the PCSCF sends the emergency callback request to a gateway node of an IP connection access network (IPCAN); and the gateway node of the IPCAN pages user equipment (UE). The implementation method for the emergency call callback and the emergency call callback system can realize the callback of the emergency call without emergency login and common login so as to increase the success rate of the emergency call callback; therefore the service quality of an emergency service is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for realizing emergency call callback in an IP multimedia subsystem and an emergency call callback system. Background technique [0002] Emergency call (Emergency Call) is a voice service in fixed network communication and mobile communication. Users can initiate emergency calls by dialing emergency call numbers (110, 112, 911, etc.). The emergency call will be transferred to the corresponding emergency call communication processing center (PSAP), such as: police station, fire brigade and emergency center, etc., which will provide customers with 24-hour emergency rescue service. The entire process is completed in cooperation between telecom operators and emergency service agencies such as public security, fire protection, and hospitals. [0003] Traditionally, emergency calls are implemented in the circuit-switched (CS) domain. With the gradual IP-based network, the packet-swi...

AI Technical Summary

Problems solved by technology

[0030] However, when the user is roaming, the user needs to register urgently or normally before calling back. Otherwise, due to the absence of various forms of registration during the call back process, the SCSCF cannot locate the PCSCF where the user is located, and the call back fails.

It is stipulated in the prior art that due to roaming restrictions, when the user is in the roaming state, ordinary registration may not be successful (roaming restrictions); thus, if the emergency call callback service is to be realized, the user needs to perform emergency registration in the roaming domain

In real scenarios, there are many possible reasons for the failure of emergency registration (such as: the old terminal does not support it, the roaming domain PCSCF does not support it, the home domain SCSCF does not support it, the emergency registration authentication fails, etc.), so that the PSAP cannot respond to the user. Phew, thereby restricting the development of emergency rescue, losing the good chance of rescue, and reducing the service quality of emergency business

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