Sidelink HARQ-ACK Reporting Across PSFCH Occasions in Unlicensed Band
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink feedback channels and reporting Hybrid Automatic Repeat Request (HARQ) acknowledgement information in unlicensed bands, particularly in scenarios involving vehicle-to-everything (V2X) communications, which require enhanced mobile broadband and ultra-reliable low latency capabilities.
Innovation Solution
A method and device for obtaining and reporting HARQ feedback information through physical sidelink feedback channel (PSFCH) occasions, utilizing slot offsets between PSFCH and physical uplink control channel (PUCCH) resources, and transmitting sidelink control information (SCI) and data via physical sidelink control and shared channels to facilitate effective communication with a base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PSFCH occasions are configured for sidelink feedback, then the reliability of HARQ feedback reporting is improved, but the device complexity and resource management overhead increase
Solution Approach 1:
The feedback reporting process is segmented into multiple PSFCH occasions, where HARQ-ACK information is divided and reported across different time instances. This segmentation allows the system to achieve higher reliability through diverse reporting opportunities while managing complexity by processing feedback in discrete, manageable units across multiple occasions.
Solution Approach 2:
The base station pre-configures multiple PSFCH occasions and their associated PUCCH resources before sidelink communication begins. This preliminary configuration establishes the feedback reporting framework in advance, reducing real-time decision complexity and enabling reliable HARQ feedback through pre-planned multiple reporting opportunities.
2Loss of time
If HARQ feedback is reported through multiple PSFCH occasions, then the latency performance is reduced, but the resource allocation complexity increases
Solution Approach 1:
The HARQ feedback timeline is segmented into multiple PSFCH occasions distributed across different slots. By dividing the feedback reporting into sequential segments rather than a single reporting point, the system reduces latency through earlier feedback availability while managing resource allocation complexity through structured, periodic occasion definitions.
Solution Approach 2:
PSFCH occasions are established as periodic time instances for feedback reporting. This periodic structure creates predictable resource allocation patterns, reducing complexity through regular intervals while achieving lower latency by providing multiple scheduled opportunities for feedback within the periodic framework.
3Adaptability or versatility
If slot offset information is utilized for PUCCH resource selection, then the adaptability of feedback reporting is improved, but the processing complexity increases
Solution Approach 1:
The system uses slot offset values as configurable parameters to adapt PUCCH resource selection to different transmission scenarios. By changing the slot offset parameter, the system can adapt feedback reporting timing and resource allocation to various sidelink configurations while managing complexity through standardized parameter-based control rather than complex adaptive algorithms.
Data Source
AI summary
Provided are a method for a first device carrying out wireless communication, and a device supporting same. The method may comprise the steps of: acquiring information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; acquiring information related to a slot offset between PSFCH-physical uplink control channel (PUCCH); transmitting, to a second device via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling second SCI and a physical sidelink shared channel (PSSCH); transmitting the second SCI and data to the second device via the PSSCH; generating HARQ feedback information for the plurality of PSFCH occasions; and reporting the HARQ feedback information to a base station on the basis of a PUCCH resource.