Interlaced PSFCH Resource Mapping for Unlicensed Sidelink HARQ
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Solution Overview
Problem
Existing sidelink communication methods are limited in flexibility and efficiency when applied to unlicensed spectrum, particularly in terms of HARQ feedback transmission and reception.
Innovation Solution
Implementing interlaced physical sidelink feedback channel (PSFCH) resource allocation using the lowest resource block (RB) set index and interlace index for HARQ feedback transmission and reception, enhancing communication flexibility and efficiency on unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing sidelink communication methods are applied to unlicensed spectrum, then communication can be established, but flexibility and efficiency are limited
Solution Approach 1:
The frequency domain resources are divided into multiple interlaces, where each interlace consists of non-contiguous resource blocks. This segmentation allows the PSFCH to be allocated on specific interlaces independently, providing flexibility in resource selection and improving adaptability to unlicensed spectrum conditions without increasing overall system complexity
Solution Approach 2:
The PSFCH resource allocation is made dynamic by allowing selection from multiple interlaces based on scheduling needs and channel conditions. The lowest RB set index and interlace index provide a systematic yet flexible method to dynamically allocate feedback resources, enhancing communication flexibility while maintaining manageable complexity
2Reliability
If HARQ feedback transmission is implemented on PSFCH over unlicensed spectrum, then communication reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The system enables self-service in HARQ feedback by allowing UEs to autonomously determine PSFCH resources using the lowest RB set index and interlace index of their allocated PSSCH resources. This self-determination mechanism improves feedback reliability through consistent resource mapping while avoiding the complexity of centralized resource allocation management
Solution Approach 2:
The invention introduces specific parameter-based resource determination methods where PSFCH resources are derived from PSSCH allocation parameters (lowest RB set index, lowest interlace index). This parameter change approach ensures reliable and consistent feedback resource allocation without requiring complex external coordination or increasing device complexity
Data Source
AI summary
A method by a user equipment (UE) is described. The method includes receiving, from another UE, a physical sidelink shared channel (PSSCH) with interlaced transmission, the PSSCH being allocated with one or more resource block (RB) sets and one or more interlaces in frequency domain; and determining, a physical sidelink feedback channel (PSFCH) resource for a HARQ feedback transmission in response to the reception of the PSSCH, wherein the PSFCH resource in frequency domain corresponds to an interlace and an RB set and is determined by using a lowest RB set index amongst the one or more RB sets and a lowest interlace index amongst the one or more interlaces.