Sidelink Relay MBMS Forwarding Using UE Feedback
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Solution Overview
Problem
Existing sidelink relay systems waste radio resources due to inefficient management of Multimedia Broadcast/Multicast Service (MBMS) forwarding, caused by frequent re-requesting or delayed termination of MBMS services, leading to suboptimal utilization of radio resources.
Innovation Solution
A method in sidelink relay systems that determines whether to continue or stop forwarding MBMS services based on feedback from UEs, using HARQ ACK/NACK on Physical Sidelink Feedback Channels, allowing timely termination of services when no UE is interested, thereby optimizing resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay device periodically re-requests MBMS service to ensure service continuity, then service reliability is improved, but radio resource waste increases due to frequent re-requesting
Solution Approach 1:
The relay device monitors feedback information (such as NACK or absence of ACK) from UEs to determine whether to continue forwarding MBMS services. This feedback mechanism allows the system to adapt service forwarding decisions based on actual UE reception status, avoiding unnecessary periodic re-requests and reducing radio resource waste while maintaining service reliability.
2Loss of energy
If the relay device stops forwarding MBMS service when no UE is interested, then radio resource utilization is improved, but service interruption may occur before timely termination
Solution Approach 1:
The system uses feedback information from UEs (such as NACK or absence of ACK) as a trigger to determine when to stop forwarding MBMS services. This feedback-driven approach enables timely and accurate service termination based on actual UE interest, improving radio resource utilization while avoiding premature or delayed service interruption.
3Reliability
If the relay device forwards MBMS service continuously without monitoring UE interest, then service reliability is maintained, but radio resource waste increases
Solution Approach 1:
The relay device monitors feedback information from UEs during MBMS service forwarding. When feedback indicates no UE interest (such as receiving NACK or no ACK within a threshold time), the relay device stops forwarding the service. This feedback-based dynamic adjustment maintains service reliability when needed while improving radio resource efficiency by avoiding continuous forwarding when unnecessary.
4Reliability
If the relay device uses periodic re-request mechanism for MBMS service, then service continuity is ensured, but device complexity increases due to timer management
Solution Approach 1:
The relay device replaces complex periodic timer-based re-request mechanisms with a simpler feedback-driven approach. By monitoring feedback information from UEs in real-time, the system can make service continuation decisions without requiring multiple timers and periodic re-requests, thereby reducing device complexity while maintaining service continuity.
Data Source
AI summary
A service maintaining method in a sidelink relay system, a relay device, and a medium are provided. The method includes: receiving feedback on a transmitted data packet from at least one UE in response to being configured to forward multicast services; and determining to stop forwarding a current MBMS service or continue to forward the current MBMS service based on the feedback on the transmitted data packet from the at least one UE.