Method and device for realizing subscriber state synchronization in IP multimedia subsystem (IMS) domain

Abstract

The invention discloses a method and a device for realizing subscriber state synchronization in an IP multimedia subsystem (IMS) domain. The method comprises the following steps that: when a subscriber does not hook on, a media gateway controller transmits an unconditional report detection on-hook event signalling to a media gateway timingly; after receiving the unconditional report detection on-hook event signalling and detecting that the subscriber is in an on-hook state, the media gateway reports an on-hook event informing signalling to the media gateway controller; and after receiving the on-hook event informing signalling, the media gateway controller judges whether to release the relevant control resources of the subscriber or not. Due to the adoption of the technical scheme, even if the on-hook informing event reported by the media gateway is lost, one side of the media gateway controller can release the relevant control resources of the subscriber in time, and the condition that the subscriber state mastered by one side of the media gateway controller is not consistent with the actual subscriber state, which is caused by the unusual condition that on-hook informing event reported by the media gateway is lost, can be avoided.

Description

technical field [0001] The present invention relates to the technical field of next-generation network IMS (IP Multimedia Subsystem, IP Multimedia Subsystem), in particular to a method and a device for realizing synchronization of user states in the IMS domain. Background technique [0002] IMS was proposed by 3GPP (3rd Generation Partnership Project) in Release 5. Its core feature is the use of SIP (Session Initiation Protocol) and its independence from access. Under the development trend, 3GPP, ETSI (European Telecommunications Standards Institute, European Telecommunications Standards Institute) and ITU-T (International Telecommunication Union-Telecommunications Standardization, International Telecommunication Union-Telecommunications Standardization Department) are all studying IMS-based network convergence solutions to achieve fixed Network and mobile network integration, so IMS is considered to be the ideal target architecture of the next generation network. [0003] ...

AI Technical Summary

Problems solved by technology

Generally speaking, when the user hangs up, the MG immediately reports to the MGC that the user's on-hook event is successful. The status is inconsistent, but in the IP network, especially the unstable UDP transmission at the network layer, packet loss is likely to occur

Once packet loss occurs, the MG fails to report the user on-hook event to the MGC, and at the same time, the MGC cannot send the off-hook detection event. At this time, the MGC uses the traditional method to continue sending AuditValue audit signaling, which cannot solve the problem.

Because the MG is completely controlled by the MGC, the status it checks is still to check whether the user is on-hook, which will cause a deadlock, that is, the MG considers that the on-hook status has been reported, but the status checked by the MGC is still checking on-hook, so the user status will always be Hanging, the MGC cannot release the related control resources of the user

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