Sidelink Terminal Resource Collision Reduction via Feedback
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Solution Overview
Problem
In NR sidelink communication, autonomous resource selection in terminals can lead to significant differences in resource quality between transmission and reception sides, affecting communication reliability due to hidden terminals and resource collisions.
Innovation Solution
A terminal is equipped with a reception unit to receive reservation information from other terminals, a control unit to determine specific conditions, and a transmission unit to transmit information related to resource allocation when certain conditions are met, thereby reducing resource collisions and improving communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal performs partial sensing to select resources autonomously in resource allocation mode 2, then power consumption is reduced and resource selection speed is improved, but communication reliability deteriorates due to hidden terminals causing significant differences in resource quality between transmission and reception sides
Solution Approach 1:
The invention introduces a feedback mechanism where the reception-side terminal measures the quality of received D2D signals and feeds back this information to the transmission-side terminal. This feedback enables the transmission-side terminal to adjust its resource selection based on actual reception quality, resolving the reliability issue caused by hidden terminals while maintaining the efficiency of autonomous resource selection.
Solution Approach 2:
The invention uses a feedback message as an intermediary to transfer quality information from the reception-side terminal to the transmission-side terminal. This intermediary mechanism allows both terminals to coordinate their resource usage based on actual channel conditions, eliminating the hidden terminal problem without requiring continuous sensing.
2Device complexity
If the terminal performs partial sensing in a limited sensing window, then the complexity of resource sensing is reduced, but resource quality assessment accuracy deteriorates due to inability to detect all competing transmissions
Solution Approach 1:
The feedback mechanism provides the transmission-side terminal with actual reception quality information from the reception-side terminal, compensating for the limited sensing window. This allows accurate resource quality assessment without requiring the transmission-side terminal to perform extensive sensing that would increase complexity.
Data Source
AI summary
A terminal includes: a reception unit configured to receive one or more pieces of reservation information related to a same resource from corresponding one or more other terminals; a control unit configured to determine whether a specific condition is satisfied; and a transmission unit configured to transmit, to one of the other terminals, information related to the same resource in a case where the control unit determines that the specific condition is satisfied.