PSFCH Resource Mapping for Reliable Sidelink Feedback Under LBT
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Solution Overview
Problem
In sidelink communication over unlicensed spectrum bands, the uncertainty of channel availability due to Listen Before Talk (LBT) failures leads to frequent PSFCH transmission failures, resulting in reduced spectrum efficiency and increased latency and transmission overhead.
Innovation Solution
A feedback channel mapping method that groups PSFCH resources based on the number of sub-channels and PSSCH slots, allocating divided PSFCH resource groups to each PSSCH slot and sub-channel to reduce the probability of transmission failure and retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT is performed before PSFCH transmission, then channel availability is ensured, but transmission failures occur when LBT fails
Solution Approach 1:
The patent segments the PSFCH resources into multiple groups based on sub-channel and PSSCH slot characteristics. By dividing the feedback channel resources into distinct groups that can be independently allocated and transmitted, the system reduces the impact of LBT failures on overall transmission reliability while maintaining spectrum efficiency through targeted resource utilization.
2Reliability
If PSFCH resources are allocated to each PSSCH slot, then feedback transmission is ensured, but transmission overhead increases
Solution Approach 1:
The patent merges multiple PSFCH resources into unified PSFCH resource groups that can be shared across multiple PSSCH slots. Instead of allocating separate resources to each slot, the system combines resources into groups that serve multiple slots through time-sharing, thereby reducing overall transmission overhead while maintaining feedback reliability.
3Adaptability or versatility
If multiple RB sets are used, then resource flexibility is improved, but LBT failure probability increases
Solution Approach 1:
The patent dynamically determines which PSFCH resource group to use based on the actual channel availability and LBT outcomes. The system adapts its resource selection in real-time, switching between different RB sets and PSFCH groups depending on whether LBT succeeds or fails, thereby maintaining flexibility while improving reliability through adaptive resource allocation.
Data Source
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AI summary
Provided are a feedback channel mapping method, an electronic device and a storage medium. The feedback channel mapping method includes the following: For each resource block set in a resource pool, a physical sidelink feedback channel, PSFCH, resource set in the resource block set and a sub-channel corresponding to a PSFCH resource in the resource block set are determined. For each resource block set, PSFCH resources in the PSFCH resource set are grouped based on the number of sub-channels corresponding to the PSFCH resources in the PSFCH resource set and the number or maximum number of physical sidelink shared channel, PSSCH, slots associated with a PSFCH slot, and divided PSFCH resource groups are allocated to each PSSCH slot in the PSSCH slots associated with the PSFCH slot and to each sub-channel in the sub-channels.