UE Multicast Reception in RRC Inactive State via Paging Updates
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Solution Overview
Problem
Existing 3GPP specifications limit multicast reception in user equipment (UE) to the Radio Resource Control (RRC) connected state, which can lead to inefficiencies and power wastage when transitioning to the RRC inactive state, especially in scenarios where multicast sessions are not active.
Innovation Solution
The UE is configured to determine the status of multicast sessions in the RRC inactive state by receiving a paging message with a session identifier, allowing it to acquire and update multicast control channel configurations as needed to maintain seamless multicast reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multicast reception is limited to RRC connected state, then configuration management is simplified, but power consumption increases and service continuity is compromised during state transitions
Solution Approach 1:
The patent implements dynamic configuration management where the UE maintains multicast configuration information in both RRC connected and inactive states. The configuration is dynamically updated based on network notifications through paging messages, allowing the system to adapt between connected and inactive states without losing multicast reception capability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multicast parameters and maintaining configuration context before the UE transitions to inactive state. This allows the UE to quickly resume multicast reception upon returning to connected state without requiring full reconfiguration, thereby reducing power consumption during state transitions.
2Ease of operation
If multicast reception is limited to RRC connected state, then configuration updates are straightforward, but service continuity is interrupted during state transitions
Solution Approach 1:
The patent ensures continuity of useful action by maintaining multicast configuration context across RRC state transitions. The UE preserves configuration information in inactive state and can seamlessly resume multicast reception upon returning to connected state, eliminating service interruptions that would otherwise occur during state transitions.
Solution Approach 2:
The patent implements feedback mechanisms where the network sends paging messages to notify UEs of configuration updates even when in inactive state. This feedback loop ensures that configuration information remains synchronized between network and UE, maintaining service continuity without requiring the UE to remain in connected state.
3Use of energy by moving object
If the UE transitions to RRC inactive state during multicast sessions, then power consumption is reduced, but multicast reception capability is lost
Solution Approach 1:
The patent enables dynamic operation where the UE can transition between connected and inactive states while maintaining multicast reception capability. By preserving configuration context and implementing efficient state management, the system allows UEs to enter inactive state for power saving while ensuring multicast capability is rapidly restored when needed.
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously manage its multicast configuration context during state transitions. The UE maintains its own configuration information and can independently determine when to update or resume multicast reception, reducing the need for continuous network control and enabling more flexible power management.
Data Source
AI summary
A communication method performed by a user equipment in a mobile communication system that provides a multicast/broadcast service (MBS) includes receiving a first PTM configuration from a network, the first PTM configuration being used for reception of a multicast session in a Radio Resource Control (RRC) inactive state, and holding the first PTM configuration, determining, in the RRC inactive state, whether the first PTM configuration needs to be updated in response to reception of a paging message from the network, the paging message including a session identifier of the multicast session, and acquiring, in the RRC inactive state, a second PTM configuration used for reception of the multicast session by receiving a multicast control channel (MCCH) for multicast communication in response to determination that the first PTM configuration needs to be updated.