NR V2X Sidelink Sensing for Resource Overlap Re-Evaluation
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Solution Overview
Problem
Existing V2X communication systems face challenges in efficiently managing resource allocation for sidelink communication, leading to potential overlaps and inefficiencies in transmitting physical sidelink control and shared channels, which can impact latency and reliability.
Innovation Solution
A method and device for performing sidelink communication in NR V2X that involves selecting resources for transmitting PSCCH or PSSCH based on sensing within specific windows, with re-evaluation mechanisms to determine overlap and adjust transmission, using configured time offsets and sensing windows to optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing windows are extended to improve resource allocation accuracy, then resource selection reliability is improved, but processing time and device complexity increase
Solution Approach 1:
The sensing window is divided into multiple sub-windows, where each sub-window corresponds to a specific time period for sensing operations. This segmentation allows the UE to perform sensing in a structured manner across different time intervals, improving resource selection reliability while managing processing complexity through organized time-based operations.
Solution Approach 2:
The method performs sensing operations in advance within configured sensing windows before actual resource allocation and transmission. By conducting sensing, re-evaluation, and resource selection in preliminary time periods, the system ensures reliable resource allocation is completed before transmission deadlines, preventing last-minute conflicts and ensuring timely resource confirmation.
2Reliability
If multiple sensing and re-evaluation operations are performed to reduce resource overlap, then resource allocation reliability is improved, but latency increases
Solution Approach 1:
The system performs sensing and re-evaluation operations periodically within configured time windows rather than continuously. Specific sensing occasions are scheduled at regular intervals defined by the network, allowing multiple evaluation opportunities while maintaining predictable timing. This periodic structure reduces average latency compared to continuous monitoring while still achieving reliable resource allocation through repeated assessments.
Solution Approach 2:
Multiple sensing and re-evaluation operations are completed in advance within the sensing window before the resource allocation decision deadline. By performing these operations preliminarily and systematically within configured time boundaries, the system ensures resource reliability is established before transmission begins, preventing last-minute resource conflicts without excessive latency during actual transmission.
3Object-generated harmful factors
If sensing window end time is set before transmission time offsets to enable re-evaluation, then resource conflict reduction is improved, but available sensing time is reduced
Solution Approach 1:
The sensing window is configured to end before transmission time offsets, forcing sensing and re-evaluation operations to be completed in advance. This preliminary timing ensures that all resource selection decisions are finalized before the actual transmission timeline begins, eliminating the possibility of resource conflicts during transmission while maintaining adequate sensing duration through proactive time management.
Solution Approach 2:
The time structure is segmented into distinct sensing window period and transmission period, with the sensing window deliberately ended before transmission offsets. This temporal segmentation separates sensing operations from transmission operations, allowing conflicts to be resolved in the sensing phase before transmission begins, while maintaining sufficient sensing time through proper window configuration.
Data Source
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AI summary
According to an embodiment of the present disclosure, a method for a first device to perform sidelink communication is provided. The method may comprise the steps of: selecting, on the basis of first sensing, a first resource for transmitting a PSCCH or a PSSCH to a second device; determining, on the basis of second sensing, whether the first resource overlaps with a resource reserved by the second device or a third device; re-evaluating, on the basis of the first resource, whether to transmit the PSCCH or the PSSCH; and transmitting the PSCCH or the PSSCH to the second device on the basis of the re-evaluation.