Sidelink Feedback PRB Allocation for Unlicensed Band Interference

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Solution Overview

Problem

Sidelink communication in unlicensed frequency bands fails due to feedback information occupying less than 80% of the channel bandwidth, leading to interference from multiple devices using the same time-frequency resource.

Innovation Solution

Send feedback information on multiple Physical Resource Blocks (PRBs) to occupy a certain proportion of the channel bandwidth in frequency domain, ensuring normal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If feedback information is sent on a single PRB in unlicensed frequency band, then device complexity is reduced, but channel bandwidth occupancy is insufficient leading to mutual interference

Engineering Contradiction:

Improvefeedback transmission complexityVSAvoidmutual interference among devices

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The feedback information transmission is segmented across multiple PRBs (at least 20% of total PRBs in the unlicensed band) rather than concentrated on a single PRB. This segmentation increases channel occupancy to prevent other devices from selecting the same resources, thereby reducing mutual interference while maintaining manageable device complexity through standardized resource selection rules.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If feedback information occupies more channel bandwidth, then mutual interference is reduced, but resource utilization efficiency decreases

Engineering Contradiction:

Improvemutual interference among devicesVSAvoidresource utilization efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent changes the parameter of PRB occupation from single-PRB to multi-PRB (at least 20% of total PRBs) specifically for unlicensed frequency bands. This parameter change ensures sufficient channel occupancy to prevent interference while the 20% threshold is optimized to balance interference prevention with resource utilization efficiency.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If PSFCH occupies only one PRB, then ease of operation is improved, but sidelink communication cannot be applied to unlicensed frequency band

Engineering Contradiction:

Improvefeedback transmission operationVSAvoidapplicability to unlicensed frequency band

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent applies different PRB occupation strategies to different frequency bands: single PRB for licensed bands (maintaining ease of operation) and multiple PRBs (at least 20% of total) for unlicensed bands (enabling applicability while preventing interference). This local quality differentiation allows the system to adapt to the specific requirements of each frequency band type.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12627451B2Wireless communication method and terminal device

Publication Date: 2026.05.12 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A wireless communication method and a terminal device. A first terminal can send feedback information on a plurality of PRBs of an unlicensed frequency band, so that the feedback information occupies a certain proportion of channel bandwidth in a frequency domain to ensure the normal transmission of the feedback information, and realize the use of sidelink communication in the unlicensed frequency band.