Sidelink Contention Window Determination Using Reference Duration
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Solution Overview
Problem
In sidelink communication systems, determining a suitable contention window (CW) for channel access in unlicensed spectrum is challenging due to the need for evaluating various factors within a reference duration, which affects the efficiency of channel access procedures.
Innovation Solution
A method and device for determining a reference duration, based on which a contention window for sidelink channel access is calculated, allowing for the evaluation of relevant factors such as timing, slot boundaries, and sidelink channel occupancy to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reference duration is determined for evaluating factors to set contention window, then the channel access efficiency is improved, but the complexity of channel access procedure increases
Solution Approach 1:
The reference duration is determined in advance before the actual channel access procedure. By pre-defining the evaluation window and the factors to be measured (such as channel occupancy, interference levels, and transmission success rates), the system prepares the necessary parameters beforehand, streamlining the subsequent contention window selection process and improving overall channel access efficiency.
2Measurement precision
If multiple factors are evaluated within reference duration to determine contention window, then the accuracy of channel access decision is improved, but the time required for channel access increases
Solution Approach 1:
The reference duration is divided into multiple measurement intervals, with different factors evaluated in each interval. For example, channel occupancy is measured in the first interval, interference levels in the second interval, and transmission success rates in the third interval. This segmentation allows comprehensive factor evaluation while distributing the measurement time, preventing excessive delay in the channel access decision.
3Adaptability or versatility
If contention window is dynamically determined based on reference duration, then the adaptability to channel conditions is improved, but the computational complexity increases
Solution Approach 1:
The contention window size is dynamically adjusted by changing key parameters such as the reference duration length and the weighting factors of different evaluation metrics based on channel conditions. When channel conditions are good, a shorter reference duration and lower weighting are used; when conditions deteriorate, the reference duration is extended and weighting is increased. This parameter-based adaptation achieves flexibility without requiring complex computational algorithms.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communications. A method comprises determining, at a first terminal device, a reference duration. A method also comprises determining, based on the reference duration, a value of a contention window for a channel access procedure for sidelink.