PDU Session Status Handling for MBS in 5G Networks
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Solution Overview
Problem
The handling of Multicast Broadcast Services (MBS) sessions associated with a released PDU session in 5G networks is undefined when the PDU session status IE indicates inactivity, leading to unclear network and UE behavior.
Innovation Solution
A method is provided where both the UE and network entities receive service accept or reject messages with a PDU session status IE indicating inactivity, leading to local release of the PDU session and determination of associated MBS sessions, with the UE or network then appropriately managing the MBS sessions by leaving or considering the UE removed from these sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PDU session status IE indicates inactivity, then the PDU session is released, but the handling of associated MBS sessions becomes undefined and unclear
Solution Approach 1:
The patent applies preliminary action by having the UE and network entity proactively determine and handle MBS session termination before the PDU session is fully released. When the PDU session status IE indicates inactivity, the UE locally determines if the PDU session is associated with MBS sessions and locally leaves these sessions, while the network entity simultaneously determines association and removes the UE from MBS sessions. This preliminary handling ensures MBS sessions are properly terminated without waiting for explicit termination signaling.
2Ease of operation
If the PDU session is released locally by UE or network, then connectivity is restored, but the MBS session association status becomes uncertain
Solution Approach 1:
The patent implements feedback mechanisms where the UE and network entity continuously monitor the PDU session status IE and automatically respond by determining MBS session associations and executing appropriate termination actions. The UE feedbacks by locally leaving MBS sessions, while the network entity feedbacks by removing the UE from MBS sessions, ensuring reliable association status management throughout the session lifecycle.
3Device complexity
If MBS sessions are not properly handled upon PDU session release, then network complexity is reduced, but network efficiency and user experience deteriorate
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine MBS session associations and locally leave MBS sessions without requiring explicit network control for each termination action. The UE independently monitors PDU session status, determines associations, and executes termination, reducing network processing complexity while maintaining network efficiency through automated handling.
Data Source
AI summary
A method for handling a PDU session status IE for MBS when the PDU session status IE indicates that the PDU session is inactive is provided. A UE receives a service accept or a service reject message from the network, which comprises a PDU session status IE indicating that a PDU session is inactive. Accordingly, the UE locally releases the PDU session if the PDU session is active, and determines if the PDU session is associated with one or more MBS sessions. If so, the UE locally leaves the associated MBS sessions. The PDU session can be a single access PDU session or a multiple access PDU session.