Sidelink Resource Selection Using LBT in Unlicensed Spectrum
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In sidelink transmission systems operating on unlicensed spectra, terminals face challenges in determining how to efficiently use available transmission resources while avoiding interference and ensuring successful data transmission, particularly due to the need for Listen Before Talk (LBT) procedures.
Innovation Solution
A terminal device determines whether to use available transmission resources for sidelink transmission based on the result of a channel access procedure, such as LBT, to utilize the unlicensed spectrum effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals perform Listen Before Talk (LBT) on unlicensed spectrum for sidelink transmission, then spectrum sharing fairness is improved, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by having terminals perform LBT in advance before the actual data transmission. The channel access procedure is completed beforehand to determine availability, and transmission resources are pre-determined based on LBT results, allowing efficient use of unlicensed spectrum while maintaining fairness through advance channel checking
Solution Approach 2:
The patent implements dynamics by making the transmission resource determination flexible based on real-time LBT results. The terminal dynamically selects transmission resources from a set of K available resources according to the channel access outcome, allowing adaptive response to changing spectrum conditions while managing delay through dynamic resource allocation
2Object-affected harmful factors
If terminals determine transmission resources based on channel access procedure results, then interference avoidance is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the transmission resource determination process into discrete steps: first determining K available transmission resources, then selectively determining whether to use each resource based on LBT results. This segmented approach simplifies the decision-making process while effectively avoiding interference through systematic resource evaluation
Solution Approach 2:
The patent utilizes parameter changes by adjusting the transmission resource selection based on the binary outcome of the channel access procedure. The terminal changes its resource determination parameters (selecting from K resources or postponing transmission) according to LBT success or failure, providing a simple yet effective interference avoidance mechanism
Data Source
Figure 1~3
Figure 4~6
Figure 7~9
AI summary
Embodiments of the present application provide a wireless communication method and device. A terminal device may determine, on the basis of a result of a channel access process, whether to use an available transmission resource to perform sidelink transmission, so that the terminal device may use an unlicensed spectrum to perform sidelink transmission. The wireless communication method comprises that: a terminal device determines K available transmission resources; for the i-th available transmission resource in the K available transmission resources, the terminal device determines, according to the result of the channel access process, whether to use the i-th available transmission resource to perform sidelink transmission, wherein i and K are positive integers, and 1 ≤ i ≤ K.