Relay UE Discovery Using Power and Resource-Aware Selection
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Solution Overview
Problem
Current relay selection procedures in mobile communication networks, such as LTE sidelink and NR SL, do not consider additional radio-related information, leading to sub-optimal relay selection and low end-to-end radio efficiency, especially in scenarios with limited single-hop coverage or high pathloss, and introduce excessive signaling overhead in multi-hop scenarios.
Innovation Solution
A mechanism to transmit relay-selection-related information to the target device, involving transmit power adjustment and radio resource selection by relay candidates, allowing for global-optimal relay selection with reduced signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If relay candidates transmit relevant information along all possible paths, then relay selection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary relay selection information (such as SL-RSRP measurements) that the target device needs to make an optimal selection, rather than transmitting all possible path information. This selective extraction reduces signaling overhead while maintaining sufficient accuracy for relay selection.
Solution Approach 2:
The patent applies partial action by having relay candidates transmit only the most relevant selection criteria information rather than complete path information. The target device performs relay selection based on this partial information set, which is sufficient for making an optimal decision without requiring exhaustive data from all paths.
2Ease of operation
If relay selection is based only on PC5 link quality and SL-RSRP, then selection simplicity is maintained, but relay selection optimality deteriorates
Solution Approach 1:
The patent changes the parameters used for relay selection by incorporating additional radio-related information beyond basic PC5 link quality and SL-RSRP. This includes using transmit power adjustments and radio resource selection metrics, which provide more comprehensive criteria for optimal relay selection while maintaining operational simplicity through standardized measurement procedures.
3Use of energy by moving object
If transmit power is not adjusted for relay discovery messages, then power consumption is reduced, but relay selection efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making transmit power adjustable rather than fixed for relay discovery messages. Relay candidates can dynamically adjust their transmit power based on their suitability as relays and the requirements of the target device, enabling optimal relay selection through controlled power variations while managing overall power consumption efficiently.
Data Source
AI summary
Inter-alia, a method is disclosed comprising: determining a suitability to serve as a relay device for a relayed communication between a first device and a second device via one or more relay devices to be selected among one or more relay device candidates; transmitting a message as part of a relay discovery procedure, and with the apparatus acting as one of the one or more relay device candidates; and performing at least one of a transmit power adjustment and/or a radio resource selection for transmitting the message based, at least in part, on the determined suitability.