PSFCH Resource Selection in NR V2X for Overlap Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In NR V2X communication, the transmission of multiple physical sidelink feedback channels (PSFCHs) can overlap, leading to issues such as deteriorated peak-to-average power ratio (PAPR), error vector magnitude (EVM), spectral emission performance, and increased Maximum Power Reduction (MPR) due to power differences and frequency separation between channels.

Innovation Solution

A method for prioritizing transmissions and receptions of PSFCHs based on their priorities, allowing only the higher priority operations to proceed, thereby resolving overlaps and improving power and spectral performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple PSFCH transmissions are performed simultaneously, then communication reliability is improved through redundant feedback, but peak-to-average power ratio deteriorates and Maximum Power Reduction increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpeak-to-average power ratio

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent applies preliminary action by determining priorities of multiple PSFCH transmissions before actual transmission occurs. The UE identifies overlapping PSFCH resources in advance and applies priority rules to select which transmissions to perform, preventing power ratio deterioration before it happens while maintaining necessary communication reliability.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple PSFCH transmissions are performed simultaneously, then feedback coverage is improved, but spectral emission performance deteriorates

Engineering Contradiction:

Improvefeedback coverageVSAvoidspectral emission performance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent determines priorities of PSFCH transmissions before actual transmission, identifying overlapping resources in advance. By applying priority rules beforehand, the system selects which PSFCH transmissions to perform, ensuring adequate feedback coverage while preventing spectral emission deterioration.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If multiple PSFCH transmissions are performed simultaneously, then communication robustness is improved, but Maximum Power Reduction increases

Engineering Contradiction:

Improvecommunication robustnessVSAvoidMaximum Power Reduction

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent applies preliminary action by determining priorities of multiple PSFCH transmissions before actual transmission. The UE identifies overlapping PSFCH resources in advance and applies priority rules to select which transmissions to perform, maintaining communication robustness while preventing excessive Maximum Power Reduction.

Inventive Principle:

Principle #10Preliminary action

4Productivity

If PSFCH transmissions are performed without priority-based selection, then transmission opportunities are maximized, but error vector magnitude deteriorates

Engineering Contradiction:

Improvetransmission opportunitiesVSAvoiderror vector magnitude

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250287416A1Method and device for selecting psfch resource in NR v2x

Publication Date: 2025.09.11 LG ELECTRONICS INC

AI summary

A method by which a first device performs wireless communication is presented. The method can comprise the steps of: receiving a plurality of first physical sidelink control channels (PSCCHs); receiving a plurality of first physical sidelink shared channels (PSSCHs) related to the plurality of first PSCCHs; transmitting a plurality of second PSCCHs; transmitting a plurality of second PSSCHs related to the plurality of second PSCCHs; and performing any one related to a high priority from among the transmission of a plurality of first physical sidelink feedback channels (PSFCHs) and the reception of a plurality of second PSFCHs on the basis of a first priority of the transmission of a plurality of first PSFCHs related to the reception of the plurality of first PSSCHs and a second priority of the reception of a plurality of second PSFCHs related to the transmission of the plurality of second PSSCHs. For example: the first priority can be the highest priority from among a plurality of priorities related to the transmission of the plurality of first PSFCHs; the second priority can be the highest priority from among a plurality of priorities related to the reception of the plurality of second PSFCHs; and the transmission of the plurality of first PSFCHs and the reception of the plurality of second PSFCHs can overlap on a time domain.