Sidelink Coordination Signaling for Low-Overhead V2X Resource Selection
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Solution Overview
Problem
In vehicle-to-everything (V2X) communication, the transmission mode 2 leads to resource collisions due to UEs independently selecting sidelink resources without network coverage, resulting in high resource overheads for coordination information and reduced transmission efficiency.
Innovation Solution
A method for reducing resource overheads by optimizing the selection and feedback of sidelink resources using a V2X communication resource pool, including PSFCH resource configuration and sequence-based inter-UE coordination, to minimize collisions and enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal sends a data packet to a server through multiple networks simultaneously, then communication reliability is improved, but determining the optimal transmission path becomes more complex
Solution Approach 1:
The server sends feedback information to the terminal indicating which network is the optimal transmission path. The terminal uses this feedback to determine subsequent data transmission paths, avoiding the complexity of independent path evaluation while maintaining reliable communication through optimized route selection.
2Reliability
If a terminal tries multiple networks to send data, then communication reliability is improved, but communication time increases due to trial and error
Solution Approach 1:
The terminal pre-establishes multiple network connections before data transmission. The server evaluates these pre-established paths and provides feedback on the optimal route, allowing the terminal to transmit data immediately through the best path without time-consuming trial and error during actual communication.
3Productivity
If the terminal independently determines the optimal path, then communication efficiency is improved, but the terminal's computational burden increases
Solution Approach 1:
The server acts as an intermediary that performs the complex path evaluation and optimization calculations. The terminal simply sends data and receives feedback from the server about the optimal path, transferring the computational burden from the terminal to the server while maintaining communication efficiency.
Data Source
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Figure 3~5a
Figure 5b
AI summary
Embodiments of this application provide a communication method, apparatus, and system, to reduce resource overheads for sending coordination information. The method includes: A first terminal apparatus determines coordination information, where the coordination information is used to assist a second terminal apparatus in determining a sidelink sending resource; and the first terminal apparatus sends the coordination information to the second terminal apparatus, where a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain.