Method and device of implementing called non-login service

Abstract

The present invention discloses an implementation method and a device of a so-called unregistered service. A called side I-CSCF receives a call request message sent by a calling subscriber, and sends the request message for the HSS of a called subscriber to inquire about an S-CSCF assigned to the called subscriber, the S-CSCF is selected according to a message returned by the HSS and the call request message is forwarded to the selected S-CSCF; the S-CSCF receives the call request message and determines the subscription data of the called subscriber unsaved by self, the request message is sent to the HSS to download the subscription data of the called subscriber; the HSS returns the subscription data through a response message and keeps that the status of the called subscriber is not registered; the S-CSCF triggers an AS according to the subscription data returned by the HSS. Therefore, the present invention ensures the consistency of the HSS and the S-CSCF data with minimum message quantity under the condition of S-CSCF not saving the unregistered subscriber data, and the operating efficiency of a system is improved.

Description

technical field [0001] The present invention relates to the implementation scheme of the non-registered service in the network of IMS (IP Multimedia Subsystem), in particular to a method and device for realizing the called non-registered service. Background technique [0002] There are two core nodes in the 3GPP standardized IP multimedia subsystem structure: Home Subscriber Server (HSS) and Serving Call Session Control Function (S-CSCF). The home subscriber server is the central database for storing user information, which contains all user-related location information, security information (including authentication and authorization information), user profile information (including the services ordered by the user) and S- CSCF information, etc. Call Session Control Function (CSCF) mainly deals with signaling signals in IMS, mainly including three types: Inquiry Call Session Control Function (I-CSCF), S-CSCF, and Proxy Call Session Control Function (P-CSCF). Among them, t...

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Problems solved by technology

[0018] Since the S-CSCF does not save the subscription data of non-registered users, the registration status of the S-CSCF user is not registered (Not Register). In order to ensure the consistency of the same user registration status on the S-CSCF and HSS, the S-CSCF and HSS Two consecutive SAR / SAA message processes are generated, and the user status changes from Not Registered to Unregistered, and then from Unregistered to Not Registered. On the one hand, the operation appears Redundancy increases the processing burden of CSCF and HSS, which affects the operating efficiency of the system. On the other hand, there is a time difference between the two SAR messages sent by the S-CSCF, and there is a process of user state switching on the HSS, which may bring unnecessary Operation hidden danger

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