MBS Interest Indication for 5G State Transition
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Solution Overview
Problem
Current 5G/NR multicast and broadcast services face challenges in efficiently managing user equipment (UE) transitions between RRC idle, inactive, and connected states, particularly in receiving and transmitting multicast and broadcast sessions without proper bandwidth configuration, leading to potential loss of service continuity.
Innovation Solution
The proposed communication method involves UE transmitting an MBS interest indication to the serving cell during state transitions, including frequency information but not the session identifier, to facilitate seamless bandwidth part configuration and maintain service continuity during state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE transmits MBS interest indication with session identifier during state transition, then service continuity is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and removes the MBS session identifier from the MBS interest indication message. Instead of including the full session identifier, the UE only transmits frequency information and cell identifier, which are sufficient for the network to identify and maintain the MBS session during state transitions. This extraction reduces signaling overhead while preserving service continuity.
Solution Approach 2:
The patent applies preliminary action by having the UE transmit MBS interest indication before the full RRC connection is established. The frequency information and cell identifier are sent in advance during the transition from idle/inactive to connected state, allowing the network to prepare bandwidth part configuration before complete connection setup, thus maintaining service continuity without requiring full session identifiers.
2Use of energy by moving object
If UE uses initial bandwidth part for MBS reception in idle state, then power saving is improved, but service disruption occurs during state transition
Solution Approach 1:
The patent applies preliminary action by having the UE transmit MBS interest indication before transitioning to connected state. This allows the network to advance configure the appropriate bandwidth part for MBS reception in preparation for the state transition. The UE can then seamlessly switch from idle-state initial bandwidth part to connected-state dedicated bandwidth part without service disruption, while maintaining power saving benefits during idle state.
Solution Approach 2:
The patent implements feedback by having the UE send MBS interest indication to the network, which then uses this feedback information to configure the appropriate bandwidth part for the UE during state transition. This feedback mechanism ensures that the network is aware of the UE's MBS reception needs and can prepare the necessary resources in advance, preventing service disruption during state changes.
3Productivity
If network configures dedicated bandwidth part upon connection establishment, then resource optimization is improved, but service disruption occurs during state transition
Solution Approach 1:
The patent applies preliminary action by having the network receive and process MBS interest indication before the UE fully transitions to connected state. The network uses this advance information to configure the dedicated bandwidth part in preparation for the state transition, rather than waiting until connection establishment. This preliminary configuration ensures seamless service continuity while maintaining resource optimization benefits.
Solution Approach 2:
The patent implements dynamics by enabling the network to dynamically adjust bandwidth part configuration based on real-time MBS interest indications from UEs during state transitions. The network can flexibly allocate and reconfigure bandwidth parts as UEs transition between idle, inactive, and connected states, optimizing resource utilization while maintaining service continuity through adaptive, dynamic rather than static configuration.
Data Source
AI summary
A communication method performed by a UE in a mobile communication system for providing a multicast and broadcast service (IBS) includes: receiving or being interested in receiving an MBS session provided in an initial bandwidth part of a serving cell or in a neighboring cell when in an RRC idle state or an RRC inactive state in the serving cell; and transmitting an MBS interest indication regarding the IBS session to the serving cell when transitioning from the RRC idle state or the RRC inactive state to an RRC connected state. The MBS interest indication does not include an MBS session identifier indicating the MBS session and includes frequency information regarding the initial bandwidth part or a cell identifier of the neighboring cell.