Remote UE PC5 RLC Entity Management for 5G Sidelink Relay Reselection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of 5G NR sidelink relaying, user equipment (UE) faces communication disruptions due to incorrect association of PC5 RLC entities with relay UE, leading to failed SRB1 message transmission between remote UE and the base station during RRC connection resume processes, especially after relay reselection occurs.
Innovation Solution
The method involves remote UE initiating an RRC connection resume process, determining the presence and correctness of the PC5 RLC entity for SRB1, and either establishing or re-establishing it to ensure association with the current serving relay UE, releasing the entity if necessary, and applying default configurations for proper transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the remote UE maintains the existing PC5 RLC entity for SRB1 after relay reselection, then the device complexity is reduced, but the communication reliability deteriorates because the RLC entity corresponds to the wrong relay UE
Solution Approach 1:
The patent applies preliminary action by checking the correspondence between the PC5 RLC entity and the current serving relay UE before resuming SRB1 transmission. The remote UE performs a determination step to verify whether the existing RLC entity corresponds to the new relay UE after relay reselection, and only resumes transmission when correspondence is confirmed, preventing communication failures in advance
Solution Approach 2:
The patent implements feedback by using the L2 ID of the current serving relay UE to verify the destination address in the PC5 RLC entity. The system continuously monitors and checks whether the RLC entity's destination address matches the current relay UE's L2 ID, providing feedback to determine whether to maintain or re-establish the RLC entity, ensuring reliable communication
2Reliability
If the remote UE re-establishes the PC5 RLC entity for SRB1 after relay reselection, then the communication reliability is improved, but the loss of time increases due to the additional setup process
Solution Approach 1:
The patent performs preliminary verification of the PC5 RLC entity's correspondence with the current serving relay UE before deciding to re-establish the entity. By checking the L2 ID match in advance, the system avoids unnecessary re-establishment operations, reducing time loss while ensuring reliability when needed
Solution Approach 2:
The patent applies dynamics by making the RLC entity management flexible and adaptive. The system dynamically determines whether to maintain or re-establish the PC5 RLC entity based on the correspondence check result, optimizing the balance between reliability and time efficiency according to the actual relay reselection scenario
Data Source
AI summary
Provided in the present invention are a method performed by user equipment and user equipment. The method comprises the following steps: remote UE initiating an RRC connection resume process, and determining whether there is a PC5 RLC entity for SRB1; and if there is no PC5 RLC entity for SRB1, the remote UE establishing a PC5 RLC entity for SRB1; or, if there is a PC5 RLC entity for SRB1, the remote UE re-establishing the PC5 RLC entity, and further determining whether the re-established PC5 RLC entity corresponds to a current serving relay UE, or corresponds to a destination address targeting the current serving relay, wherein, if no correspondence is found, the remote UE associates the re-established PC5 RLC entity with the current serving relay UE, or associates same with the destination address targeting the current serving relay.