Sidelink Resource Conflict Detection and Feedback Mechanism
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Solution Overview
Problem
In sidelink communication, terminal devices face challenges in efficiently detecting and resolving resource conflicts, leading to potential collisions and reduced reliability in data transmission due to hidden nodes, half-duplex limitations, and high power consumption during resource selection.
Innovation Solution
A method where a first terminal device determines the presence of a resource conflict on resources reserved by a second terminal device and decides to send a resource conflict indication on a target time unit, allowing the second terminal device to perform reselection, thereby improving the reliability of sidelink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices continuously monitor and select resources for sidelink communication, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having terminal devices perform resource sensing and conflict detection in advance before actual data transmission. The first terminal device senses resources and detects potential conflicts with second terminal device's reserved resources beforehand, allowing conflict indication to be sent via PSFCH before the collision occurs. This advance detection and indication mechanism enables the second terminal to perform resource reselection prior to transmission, thereby ensuring reliability without requiring continuous active monitoring during transmission moments.
2Manufacturing precision
If terminal devices send frequent resource conflict indications, then resource allocation accuracy is improved, but signal interference increases
Solution Approach 1:
The patent extracts the resource conflict indication function from the main data transmission channel and separates it into a dedicated feedback mechanism. The first terminal device sends resource conflict indications through the physical sidelink feedback channel (PSFCH) rather than interfering with the second terminal's data transmission. This extraction allows the conflict indication to be transmitted on a separate channel with its own resource allocation, preventing signal interference with ongoing data transmissions while maintaining accurate resource allocation information delivery.
3Reliability
If terminal devices perform resource reselection upon conflict detection, then transmission reliability is improved, but time delay increases
Solution Approach 1:
The patent implements feedback by having the first terminal device send resource conflict indications to the second terminal device through the PSFCH channel. The second terminal receives this feedback information about the resource conflict, processes the conflict resolution decision, and performs resource reselection accordingly. This feedback mechanism ensures that the second terminal is informed of the conflict situation and can timely adjust its resource allocation, achieving reliable transmission with minimal time delay through efficient information exchange.
Data Source
AI summary
A method for wireless communication and a terminal device is provided. The method for wireless communication includes the following. The first terminal device determines the presence of the resource conflict on the resources reserved by the second terminal device on the first time unit. The first terminal device determines whether to send the resource conflict indication to the second terminal device on the target time unit. The resource conflict indication indicates the presence of the resource conflict on the resources reserved by the second terminal device on the first time unit, the target time unit is a last time unit of at least one time unit before the first time unit, an interval between the target time unit and the first time unit is greater than or equal to a first threshold, and the at least one time unit is used for transmission of sidelink (SL) feedback information