Multicast Reception Paging for RRC Inactive State Transitions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multicast sessions during Radio Resource Control (RRC) transitions, particularly when network congestion is alleviated, leading to inefficient resource usage and suboptimal UE behavior.
Innovation Solution
Incorporating a new indicator in the paging message to allow gNB to command UEs in RRC_INACTIVE to transition to RRC_CONNECTED when network congestion is alleviated, even if multicast reception is allowed in RRC_INACTIVE, thereby optimizing resource usage and UE behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UE receives multicast session in RRC_INACTIVE state, then resource consumption is reduced and power efficiency is improved, but the network cannot provide feedback-based multicast re-transmission
Solution Approach 1:
The system dynamically transitions UE between RRC_INACTIVE and RRC_CONNECTED states based on network conditions and multicast service requirements. The gNB can command UE to transition to RRC_CONNECTED when feedback-based re-transmission is needed, while allowing RRC_INACTIVE for normal multicast reception, thus adapting the state based on operational needs
2Reliability
If gNB commands all UEs to transition to RRC_CONNECTED when congestion is alleviated, then feedback-based multicast re-transmission can be provided, but resource usage efficiency decreases
Solution Approach 1:
The network applies different quality requirements to different UE groups or individual UEs based on their multicast reception needs. Instead of uniformly transitioning all UEs to RRC_CONNECTED, the gNB selectively commands only those UEs that require feedback-based re-transmission to transition, while others remain in RRC_INACTIVE, thus optimizing resource usage
3Reliability
If UE initiates RRC resume procedure upon receiving paging, then multicast session can be received in RRC_CONNECTED, but the procedure complexity increases and resources are consumed
Solution Approach 1:
The UE autonomously determines whether to initiate RRC resume procedure based on the indicator received in the paging message. If the indicator shows multicast reception is allowed in RRC_INACTIVE, the UE remains in that state without initiating resume. This self-service approach reduces unnecessary procedure complexity and resource consumption while ensuring reliable multicast reception
Data Source
AI summary
A method and apparatus for multicast reception in a wireless communication system is provided. The method comprises: joining a MBS session indicated by a group ID; entering into RRC_INACTIVE upon receiving an RRC release message including a suspend configuration; receiving a paging message including the group ID and an indicator, wherein the indicator informs whether multicast reception in RRC_INACTIVE is allowed or not for the MBS session; and based on the indicator informing that the multicast reception in RRC_INACTIVE is not allowed, initiating an RRC connection resume procedure.