NR Multicast Configuration Across RRC State Transitions
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Solution Overview
Problem
Existing wireless communication technologies experience service interruptions, data loss, and large delays during RRC state transitions in multicast and broadcast services (MBS), particularly in transitioning between RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states.
Innovation Solution
A method and apparatus for MBS that ensures service continuity and optimizes configuration signaling during RRC state transitions by allowing continued use of the first MBS configuration before switching to a second RRC state, including techniques such as transmitting MBS indications, using compatible bandwidth parts, and managing MBS configuration updates to minimize service interruptions and data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RRC state transition is performed between RRC_IDLE/RRC_INACTIVE and RRC_CONNECTED states, then network resource allocation and service delivery are optimized, but service interruption and data loss occur
Solution Approach 1:
The patent applies preliminary action by performing MBS configuration update and activation preparation before the actual RRC state transition occurs. The network side prepares the MBS configuration in advance and activates it before the UE transitions from RRC_IDLE or RRC_INACTIVE to RRC_CONNECTED state, ensuring that MBS service can continue without interruption or data loss during the state change.
2Reliability
If MBS configuration is updated during RRC state transition, then service continuity is improved, but signaling overhead and complexity increase
Solution Approach 1:
The patent extracts the MBS configuration update process from the traditional RRC state transition procedure. Instead of updating MBS configuration as part of the complex RRC state transition signaling, the patent separates the MBS configuration update and activation into a distinct process that occurs before state transition, reducing the signaling overhead and complexity associated with RRC state changes while maintaining service continuity.
3Manufacturing precision
If MBS data reception is suspended during RRC state transition, then configuration accuracy is improved, but data loss and delay increase
Solution Approach 1:
The patent applies continuity of useful action by ensuring that MBS data reception continues without suspension during the RRC state transition process. The MBS configuration is updated and activated before the state transition, allowing the UE to maintain continuous MBS data reception throughout the transition from RRC_IDLE or RRC_INACTIVE to RRC_CONNECTED state, eliminating data loss and reception delays.
Data Source
AI summary
Embodiments of the present application are related to a method and apparatus for multicast and broadcast services (MBS). According an embodiment of the present application, an exemplary method includes: receiving a first MBS configuration; using the first MBS configuration for MBS data reception in a first radio resource control (RRC) state; and in response to a RRC state transition occurring, at least before entering a second RRC state from the first RRC state, continuing using the first MBS configuration for MBS data reception, or suspending MBS data reception.