MBS Session Paging for UEs in RRC Inactive State
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing Multicast Broadcast Service (MBS) multicast sessions for User Equipment (UE) in Radio Resource Control (RRC)_INACTIVE state, leading to increased power consumption, processing time, and network congestion due to unclear UE behavior in handling session activation, deactivation, and release notifications.
Innovation Solution
A method and apparatus for managing MBS multicast sessions in UE by using group notification messages that include session status, RRC state, and congestion information, allowing UEs to update their configurations and states based on these messages, even in RRC_INACTIVE state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs monitor for group notification messages in RRC_INACTIVE state, then session activation notifications can be received, but power consumption increases
Solution Approach 1:
The network performs preliminary actions by sending activation notifications before the UE actually needs to activate the session. The UE receives the notification in RRC_INACTIVE state and can prepare accordingly, but the key insight is that the network handles the activation logic in advance rather than requiring continuous UE monitoring.
Solution Approach 2:
The system establishes a feedback mechanism where the network sends group notification messages to inform UEs about session status changes. This feedback loop allows UEs to react appropriately to session activations without requiring continuous active monitoring, thus reducing power consumption while maintaining reliability.
2Reliability
If UEs transition to RRC_CONNECTED state to handle session changes, then session management is thorough, but processing time increases
Solution Approach 1:
The session management process is segmented into different handling mechanisms based on UE state. In RRC_INACTIVE state, UEs handle session changes through lightweight notifications and configuration updates without full connection establishment. Only when necessary do UEs transition to RRC_CONNECTED state for more comprehensive session management, thus reducing overall processing time while maintaining completeness.
Solution Approach 2:
The system dynamically adapts the session management approach based on UE state and notification content. UEs can remain in RRC_INACTIVE state for most session changes, transitioning to RRC_CONNECTED only when required by the specific session management needs, optimizing the balance between management completeness and processing time.
3Loss of information
If network sends frequent group notification messages, then session status is kept updated, but network congestion increases
Solution Approach 1:
Instead of continuous or frequent notification messages, the network employs periodic action by sending group notification messages only when necessary session status changes occur. This approach ensures that session status information is kept updated without generating unnecessary traffic, thus preventing network congestion while maintaining information accuracy.
Solution Approach 2:
The notification mechanism serves itself by automatically triggering only when session status changes occur, eliminating the need for continuous network-initiated status queries. UEs autonomously manage their session status based on received notifications, reducing overall network traffic while ensuring necessary information is transmitted.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Specifically, the disclosure related to method performed by a user equipment (UE) in a wireless communication system. The method includes receiving, from a base station (BS), a radio resource control (RRC) release message including a suspend configuration, the RRC release message including configuration information for a reception of a multicast session in an RRC inactive state. Further, the method includes receiving, from the BS while the UE is in the RRC inactive state, a first group paging message indicating an activation of the multicast session based on the configuration information. Further, the method includes receiving, from the BS while the UE is in the RRC inactive state, a multicast of the multicast session based on the configuration information.