NR Sidelink Resource Reservation with Preliminary Unlicensed-Band Sensing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing unlicensed bands for sidelink transmissions due to the need for efficient channel sensing and resource allocation, particularly in scenarios requiring low latency and high reliability, such as vehicle-to-everything (V2X) communications.
Innovation Solution
A method and apparatus for determining a channel sensing interval and selecting resources on an unlicensed band, performing channel sensing before the resource start time, and conducting sidelink transmissions only if the channel is idle, ensuring efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel sensing is performed frequently to ensure reliable resource selection, then communication reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by performing channel sensing in advance before the actual transmission time. The device determines a channel sensing interval and selects resources based on sensing results obtained prior to transmission, allowing the transmission to proceed without additional sensing delay. This resolves the contradiction by preparing sensing information beforehand, ensuring reliability while avoiding latency.
2Productivity
If resource selection time interval is reduced to increase transmission speed, then productivity is improved, but channel sensing accuracy deteriorates
Solution Approach 1:
The patent performs channel sensing and resource selection as preliminary actions before transmission. By determining the sensing interval and selecting resources in advance, the system achieves both fast transmission (high productivity) and accurate sensing (high measurement precision). The sensing is completed beforehand, so the actual transmission can proceed immediately without compromising either speed or accuracy.
3Measurement precision
If channel sensing interval is extended to improve sensing accuracy, then measurement precision is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent extends the sensing interval for accurate sensing while maintaining efficiency by performing all sensing and selection actions as preliminary steps before transmission. The device determines a appropriate sensing interval and completes resource selection in advance, allowing the transmission to proceed immediately. This resolves the contradiction by separating the sensing duration (for accuracy) from the transmission timing (for efficiency).
Data Source
AI summary
Proposed is an operation method of a first device (100) in a wireless communication system. The method may comprise the steps of: determining the length of a channel sensing interval; selecting at least one resource on an unlicensed band; performing first channel sensing from a point of time that is before a start point of time of a first resource from among the at least one resource by as much as the channel sensing interval to the start point of time of the first resource; and performing SL transmission by using the first resource on the basis of a result of the first channel sensing being idle.