MBMS UE Context Deactivation in WCDMA RNC
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Solution Overview
Problem
The prior MBMS Deactivation procedure in WCDMA communication systems fails to completely remove the MBMS UE Context from the RNC, leading to waste of radio resources and inconsistency of data among network elements, resulting in hidden troubles and incorrect implementation of future products.
Innovation Solution
A comprehensive deactivation method that includes context deactivation steps in the SGSN, user equipment, GGSN, and RNC, with the RNC being triggered by the SGSN to ensure complete removal of MBMS UE Context, using specific signaling procedures to delete information from the RNC and other network elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the MBMS Multicast Service Deactivation procedure is implemented according to the prior art, then the MBMS UE Context is removed from the UE, SGSN, and GGSN, but the MBMS UE Context remains retained in the RNC
Solution Approach 1:
The patent extracts the MBMS UE Context information from the RNC separately from the standard deactivation procedure. A specific de-link request message is sent to the RNC to remove and extract the retained MBMS UE Context, ensuring complete removal from all network elements including the RNC where it was previously left behind.
2Productivity
If the MBMS Multicast Service Deactivation procedure is implemented according to the prior art, then the deactivation process is simple and quick, but the MBMS UE Context becomes inconsistent across different network elements
Solution Approach 1:
The patent implements a feedback mechanism where the SGSN sends a de-link request message to the RNC after completing deactivation in other network elements. The RNC responds with a de-link response message confirming the removal of MBMS UE Context, ensuring all network elements have consistent state information and resolving the data inconsistency problem.
3Loss of information
If the MBMS Multicast Service Deactivation procedure is extended to include RNC context removal, then complete context deactivation is achieved, but the signaling interaction and procedure complexity increases
Solution Approach 1:
The patent applies preliminary action by having the SGSN initiate the de-link request to the RNC immediately after completing deactivation in other network elements. This structured sequence ensures the RNC is notified and processes the context removal in advance of any subsequent operations, maintaining consistency without requiring complex coordinated procedures among all network elements simultaneously.
Data Source
AI summary
The present invention provides a deactivation method of multimedia broadcast multicast service for wireless communication system, comprising steps of: in SGSN, completing the context deactivation of user equipment of broadcast multicast service; in the user equipment, completing the context deactivation of user equipment of multimedia broadcast multicast service; in GGSN, completing the context deactivation of user equipment of multimedia broadcast multicast service; characterized by further comprising steps of: in SGSN, after completing the context deactivation of user equipment of multimedia broadcast multicast service, completing the context deactivation of user equipment of multimedia broadcast multicast service in a radio network controller of a radio access network. According to the method of the present invention, the context of user equipment of multimedia broadcast multicast service in the radio network controller is deleted, so that the waste of radio resources is prevented, the hidden troubles induced by the inconsistency of data among the network elements is removed, and a foundation for the correct realization of future products is laid.