Sidelink Resource Coordination for Hidden Node and Half-Duplex Limits
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Solution Overview
Problem
The existing NR-V2X sidelink transmission modes suffer from issues such as hidden node interference, resource waste due to half-duplex limitations, and excessive power consumption during resource selection in Mode 2.
Innovation Solution
Terminals exchange assistance information, including resource indication, time slot information, and signal quality thresholds, to facilitate informed resource selection and mitigate hidden node and half-duplex problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminals perform sensing to select transmission resources in Mode 2, then resource selection accuracy is improved, but power consumption increases
Solution Approach 1:
The base station performs sensing operations in advance and pre-determines suitable transmission resources for terminals before data transmission. This preliminary action allows terminals to directly use the pre-selected resources without performing their own sensing, thereby maintaining resource selection accuracy while significantly reducing terminal power consumption.
Solution Approach 2:
The base station acts as an intermediary between the sensing function and the terminal. Instead of terminals performing sensing directly, the base station performs sensing on behalf of terminals and provides pre-selected resources. This intermediary approach transfers the power-consuming sensing operation from the terminal to the base station, resolving the contradiction between accurate resource selection and low power consumption.
2Device complexity
If terminals randomly select transmission resources, then device complexity is reduced, but data transmission reliability deteriorates due to hidden node interference
Solution Approach 1:
The base station serves as an intermediary that performs sensing and resource selection on behalf of terminals. This eliminates the need for complex terminal-side sensing while ensuring reliable resource selection by leveraging the base station's omniscient position that can detect hidden node interference that terminals cannot detect.
Solution Approach 2:
The base station utilizes feedback from sensing operations to make informed resource allocation decisions. By continuously monitoring the wireless environment and using this feedback to pre-select resources, the base station ensures reliable transmission while keeping terminal complexity low. The feedback mechanism enables the base station to avoid hidden node interference without requiring terminals to perform complex sensing.
3Measurement precision
If terminals perform sensing operations, then resource selection quality is improved, but the time required for resource selection increases
Solution Approach 1:
The base station performs sensing and resource selection operations in advance, before the actual data transmission occurs. This preliminary action eliminates the time delay that would otherwise occur at the terminal during data transmission, as resources are already pre-selected and ready for use. The time-consuming sensing operation is shifted to occur beforehand by the base station.
Solution Approach 2:
The base station acts as an intermediary that performs sensing operations centrally, eliminating the need for each terminal to perform time-consuming sensing independently. This centralized approach reduces overall resource selection time while maintaining selection quality, as the base station can aggregate sensing information and make coordinated resource allocations across multiple terminals.
Data Source
AI summary
The present disclosure provides a wireless communication method and a terminal device, capable of avoiding data transmission problems caused by hidden nodes and half-duplex in sidelink transmission. The method includes: receiving, by a first terminal, first information transmitted by a second terminal. The first information is used by the first terminal to determine a resource for sidelink transmission. The first information includes at least one of: resource indication information indicating at least one transmission resource; time slot indication information indicating a reference time slot for the at least one transmission resource, or a time slot position of a resource selection time window corresponding to the at least one transmission resource; or a signal quality threshold used for determining a reference quality threshold for the at least one transmission resource.