Relay UE Identifier Alignment for NR Sidelink Packet Reliability
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Solution Overview
Problem
Data packet loss occurs due to asynchronous updates of local identifiers between remote UE and relay UE during the U2N relay technology in NR sidelink communication, leading to unreliable data transmission.
Innovation Solution
Implement a communication method where the relay terminal device processes data packets based on configuration information that aligns local identifiers, regardless of the timing of updates, to ensure consistent identification and handling, thereby preventing packet loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station updates the local ID of the remote UE by sending an RRC reconfiguration message to both the remote UE and the relay UE, then the local ID can be updated, but data packet loss occurs because the remote UE and relay UE receive the update at different times
Solution Approach 1:
The base station sends a first RRC reconfiguration message to the remote UE in advance to update the local ID before sending the update to the relay UE. This preliminary action ensures that the remote UE is ready to receive and process data packets with the new local ID, preventing packet loss during the transition period.
Solution Approach 2:
The remote UE acts as an intermediary that receives the local ID update first and then forwards the updated local ID information to the relay UE through subsequent communication. This intermediary approach ensures synchronized updates across both devices, maintaining data transmission reliability during the identifier transition.
2Ease of operation
If the base station sends the updated local ID to both remote UE and relay UE simultaneously, then both devices can be updated, but asynchronous reception timing causes packet loss
Solution Approach 1:
The base station performs the update operation in a specific sequence: first sending the RRC reconfiguration message to the remote UE, then subsequently updating the relay UE. This sequential preliminary action maintains operational simplicity while ensuring the remote UE is prepared before the relay UE receives the update, preventing packet loss.
Solution Approach 2:
The update operation is segmented into distinct phases: Phase 1 updates the remote UE with the new local ID, and Phase 2 updates the relay UE. This segmentation allows each device to be updated independently at appropriate times, ensuring data transmission reliability without complicating the overall update process.
Data Source
AI summary
Disclosed are a communication method and apparatus. A relay terminal device receives first configuration information from a network device. The first configuration information includes a first local identifier and a first identifier, the first local identifier is an identifier that is allocated by the network device and that identifies a remote terminal device, the first identifier is an identifier that is allocated by the remote terminal device and that identifies the remote terminal device, and the remote terminal device communicates with the network device via the relay terminal device. The relay terminal device receives a first data packet based on the first identifier, and processes the first data packet based on the first configuration information.