Sidelink Relay UE Selection Using Cell ID and Uu Link Matching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently selecting a reliable relay UE for sidelink communication, particularly in scenarios requiring high reliability and low latency, such as vehicle-to-everything (V2X) applications, which affect service continuity and network performance.
Innovation Solution
A method for selecting a sidelink relay UE based on sidelink signal strength and comparison of cell IDs with Uu link signal strength, prioritizing candidate relay UEs with matching cell IDs and sufficient sidelink signal strength, to ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay UE selection is based only on sidelink signal strength, then communication coverage is extended, but service continuity and reliability deteriorate
Solution Approach 1:
The patent changes the selection parameters from only sidelink signal strength to a composite evaluation including sidelink signal strength, Uu link signal strength, and cell ID matching. This multi-parameter approach resolves the contradiction by ensuring that relay UEs selected not only extend coverage but also maintain reliable backhaul connections to the network through cell ID matching and Uu link quality assessment.
Solution Approach 2:
The patent creates a composite selection criterion that combines multiple factors (sidelink signal strength, Uu link signal strength, cell ID matching) into a unified relay selection mechanism. This composite approach ensures that the selected relay UE provides both coverage extension and service continuity by satisfying multiple conditions simultaneously.
2Length of moving object
If relay UE selection prioritizes signal strength, then communication range is increased, but latency increases due to additional selection complexity
Solution Approach 1:
The patent performs preliminary actions by pre-configuring cell ID lists and maintaining Uu link signal strength measurements before relay selection is needed. This allows the relay selection process to quickly compare candidate UEs against pre-evaluated criteria, reducing the time required for selection while still achieving extended communication range through comprehensive evaluation.
3Reliability
If multiple criteria are used for relay UE selection, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the relay selection process into distinct evaluation stages: first filtering candidates by cell ID matching, then assessing sidelink signal strength, and finally evaluating Uu link signal strength. This segmentation reduces complexity by breaking down the multi-criteria selection into manageable steps that can be executed systematically.
Data Source
AI summary
An embodiment relates to a method for selecting a sidelink relay in a wireless communication system. The method comprises: selecting, by remote UE, at least one candidate relay UE; and selecting, by the remote UE, relay UE from among the at least one candidate relay UE, wherein the selection of the at least one candidate relay UE is on the basis of sidelink signal strength of each of the at least one candidate relay UE, and the selection of the relay UE is on the basis of comparison between a cell ID of each of the at least one candidate relay UE and a cell ID selected according to Uu link signal strength.