Method and CSCF (Call Session Control Function) for realizing calling when HSS (Home Subscriber Server) is abnormal

Abstract

The invention relates to a method and a CSCF (Call Session Control Function) for realizing calling when an HSS (Home Subscriber Server) is abnormal. The method comprises the following steps of: during the process of CSCF forwarding an initial conversation request sent by UE (User Equipment) to the HSS, when the HSS is abnormal, inquiring all adjacent S-CSCF (Servicing CSCF) by CSCF; and forwarding the initial conversation request to the adjacent S-CSCF by a serial or parallel method so as to finish UE calling service. In the invention, during the calling process of an IP (Internet Protocol) multimedia subsystem, when the HSS is abnormal, all adjacent S-CSCF network elements are inquired by I (Interrogating)-CSCF in the CSCF; the initial conversation requests sent by users are forwarded to the adjacent S-CSCF network elements through the serial or parallel method; and the corresponding process is performed according to the calling response returned by the adjacent S-CSCF network elements so as to finish the calling service of the users, so that the risks caused when the HSS is abnormal are reduced, and a success rate of the users is effectively improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for realizing a call when the HSS is abnormal and a CSCF. Background technique [0002] IMS (IP Multimedia Core Network Subsystem, IP Multimedia Subsystem) is a next-generation network standard defined by the 3rd Generation Partnership Project (3GPP), and its notable feature is the use of the Session Initial Protocol (SIP) ) system, communication and access have nothing to do, and can have multiple capabilities such as separation of multimedia service control functions and carrying capacity, separation of call and service, separation of application and service, separation of service and network, and integration of mobile network and Internet services. [0003] The main functional entities in the IMS include the call control entity (Call Session Control Function, CSCF) that controls functions such as user registration and session control. , Interrogating CSCF) and ...

AI Technical Summary

Problems solved by technology

[0015] From the above process, it can be seen that due to HSS downtime or network abnormality, the IMS will fail to process the call request initiated by the user, resulting in the suspension of the normal call process of the user and reducing the connection rate of the user.

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