NR V2X HARQ Feedback Decision Based on SCI Format
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Solution Overview
Problem
In Next Generation Radio (NR) V2X communication, there is a need for a method to enable distance-based Hybrid Automatic Repeat Request (HARQ) feedback operation and apparatus supporting the same, particularly for determining whether to perform HARQ feedback based on the format of sidelink control information (SCI) received from another device, which includes or excludes location information, and includes ACK or NACK feedback.
Innovation Solution
A method and apparatus for a device to receive sidelink control information (SCI) through a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH), determine a physical sidelink feedback channel (PSFCH) resource, and decide whether to transmit HARQ feedback information to another device based on the SCI format, which may include or exclude location information, and includes ACK or NACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback information is always transmitted on PSFCH resource, then communication reliability is improved, but communication overhead and latency increase
Solution Approach 1:
The patent changes the parameter of HARQ feedback transmission by making it conditional rather than constant. The feedback transmission decision is based on comparing the measured distance with a threshold value, allowing the system to adapt between transmitting feedback (for reliability) and not transmitting (for reduced overhead/latency) based on communication conditions
2Productivity
If distance-based HARQ feedback operation is implemented, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling devices to autonomously determine whether to transmit HARQ feedback based on their own distance measurements and comparisons with thresholds, without requiring complex centralized control or coordination from network infrastructure
Solution Approach 2:
The patent introduces distance as a new parameter for controlling HARQ feedback behavior. By measuring distance and comparing it with a threshold, the system dynamically adjusts feedback transmission decisions, improving efficiency while keeping the decision logic relatively simple
Data Source
AI summary
Provided are a method for a first device to perform wireless communication, and a device for supporting same. The method may include: receiving, from a second device, a first sidelink control information (SCI) through a physical sidelink control channel (PSCCH); receiving, from the second device, a second SCI through a physical sidelink shared channel (PSSCH) related to the PSCCH; determining a physical sidelink feedback channel (PSFCH) resource, based on an index of a slot and an index of a subchannel related to the PSSCH; and determining whether or not to transmit hybrid automatic repeat request (HARQ) feedback information for the PSSCH to the second device on the PSFCH resource, wherein a format of the second SCI is a first format which does not include location information of the second device or a second format which includes location information of the second device.