Sidelink Relay UE Identification via MAC Layer Signaling
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Solution Overview
Problem
The introduction of the adaptation layer in UE-to-UE relay (U2U relay) in 5G standardization has posed challenges in determining identification information of source and destination UEs, leading to increased signaling overhead and inefficient use of radio resources.
Innovation Solution
A method and apparatus for determining first and second identification information of terminal equipment in the adaptation layer, allowing data transmission and reception based on these identifiers, thereby reducing signaling overhead and conserving radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If identification information of source UE and destination UE is transmitted in the adaptation layer, then data transmission can be performed, but signaling overhead increases
Solution Approach 1:
The patent extracts the identification information transmission function from the adaptation layer and implements it in the MAC layer instead. Specifically, the source L2 ID and destination L2 ID are carried in MAC layer control elements (MAC CE) or uplink control information (UCI), separating this function from the adaptation layer to reduce adaptation layer overhead while maintaining data transmission capability
Solution Approach 2:
The patent introduces the MAC layer as an intermediary between the physical layer and the adaptation layer. The MAC layer handles the transmission of identification information through MAC CEs or UCI, acting as a mediator that reduces the signaling burden on the adaptation layer while ensuring proper routing of data packets
2Measurement precision
If detailed identification information is transmitted, then accurate routing is achieved, but radio resources are consumed
Solution Approach 1:
The patent extracts the identification information from higher-layer protocols and implements it in the MAC layer using compact representations. The source L2 ID and destination L2 ID are encoded efficiently in MAC CEs or UCI, reducing the number of bits required compared to full identification transmission in the adaptation layer
Solution Approach 2:
The patent changes the representation parameters of identification information by using L2 IDs (which are shorter than full UE identities) and implementing them in the MAC layer rather than the adaptation layer. This parameter change reduces the information size while maintaining routing accuracy
Data Source
AI summary
A data reception and transmission apparatus, configured in a terminal equipment, includes: processor circuitry configured to determine a first identification information of a first terminal equipment and/or a second identification information of a second terminal equipment, wherein the first identification information and the second identification information are used in a sidelink relay adaptation protocol (SRAP) layer; a receiver configured to receive a first data from the first terminal equipment; and a transmitter configured to transmit a second data to the second terminal equipment according to the first identification information and/or the second identification information, wherein the first identification information and/or the second identification information are/is assigned by the terminal equipment.