HARQ Feedback Reporting in NR V2X Sidelink via PUCCH
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing sidelink communication, particularly for User Equipments (UEs) that need to request retransmission resources, as they lack a method to effectively report hybrid automatic repeat request (HARQ) feedback information to the base station.
Innovation Solution
A method and apparatus for a UE to receive downlink control information related to sidelink resources and uplink control channel resources, transmit sidelink shared channels based on these resources, and report HARQ feedback information to the base station through a physical uplink control channel, utilizing a pre-configured PUCCH resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If UEs perform sidelink communication without base station intervention, then communication overhead of base station is reduced, but UEs cannot effectively report HARQ feedback information to request retransmission resources
Solution Approach 1:
The patent introduces a base station as an intermediary entity that UEs can optionally communicate with for HARQ feedback reporting. Even in sidelink mode where base station intervention is minimized, the base station serves as a mediator to receive HARQ feedback from UEs and coordinate retransmission resources, thus maintaining reliability without requiring constant base station involvement in all communication aspects.
2Device complexity
If UEs autonomously select sidelink resources, then device complexity and base station overhead are reduced, but communication reliability and resource allocation efficiency deteriorate
Solution Approach 1:
The patent implements a dynamic resource allocation mechanism where UEs can autonomously select sidelink resources from pre-configured pools, reducing complexity.同时, the base station maintains the ability to reconfigure resource pools and receive HARQ feedback to coordinate retransmissions, dynamically adjusting resource allocation based on channel conditions and communication needs, thus balancing autonomy with reliability.
3Adaptability or versatility
If multiple PUCCH resources are configured for different SL resources, then HARQ feedback reporting flexibility is improved, but uplink control channel resource overhead increases
Solution Approach 1:
The patent implements a universal PUCCH resource configuration where a single PUCCH resource can be used to report HARQ feedback for multiple sidelink resources. Instead of allocating dedicated PUCCH resources for each SL resource, the system allows UEs to use shared or pooled PUCCH resources for feedback reporting, reducing uplink control channel overhead while maintaining the ability to handle multiple SL transmissions through multiplexing and time-division strategies.
Data Source
AI summary
A method for a first device to perform wireless communication and a device supporting same. The method may include: receiving, from the base station through a second PDCCH, a second DCI including information related to a second SL resource and information related to a second PUCCH resource; transmitting a first physical sidelink shared channel (PSSCH) based on the first SL resource; and transmitting, to the base station through the second PUCCH resource, first hybrid automatic repeat request (HARQ) feedback information related to the first PSSCH and second HARQ feedback information related to the second PSSCH, based on a slot including the first PUCCH resource being same as a slot including the second PUCCH resource, wherein the second DCI is a last DCI among a plurality of DCIs including information related to the slot for PUCCH transmission.