Sidelink Resource Selection with UE Feedback for Hidden-Node Collisions

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Solution Overview

Problem

Existing sidelink communication systems face issues with transmission collisions due to hidden nodes and half-duplex problems, leading to unreliable communication and inefficient resource selection by user equipment (UEs) without considering the channel environment of target receivers.

Innovation Solution

A user equipment (UE) requests assistance from a second UE to provide resource information through UE assistance information (UEAI) or scheduling request/buffer status report (SR/BSR), allowing the first UE to select or avoid resources based on the received information to mitigate collisions and half-duplex issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a transmitter UE autonomously selects resources for sidelink transmission, then the device complexity and processing power requirements are reduced, but transmission collisions occur due to hidden node issues and the transmitter cannot guarantee collision-free reception

Engineering Contradiction:

Improveresource selection complexityVSAvoidcollision-free reception reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces a receiver UE as an intermediary that assists the transmitter UE in resource selection. The receiver UE provides feedback information about its receiving status and channel conditions, enabling the transmitter to make informed resource selection decisions without significantly increasing its own processing complexity, while ensuring collision-free reception.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements a feedback mechanism where the receiver UE sends receiving status information and channel state information back to the transmitter UE. This feedback loop enables the transmitter to adjust its resource selection based on actual channel conditions and receiver status, improving reception reliability without requiring complex autonomous resource selection algorithms.

Inventive Principle:

Principle #23Feedback

2Extent of automation

If a transmitter UE autonomously performs resource selection, then the system operates with minimal network control, but the transmitter cannot be aware of channel environment at the receiver side and thus cannot avoid collisions

Engineering Contradiction:

Improveautonomous resource selectionVSAvoidchannel environment information

Core Design Contradiction:

Extent of automationVSLoss of information

Solution Approach 1:

The receiver UE provides feedback information including channel state information and receiving status to the transmitter UE. This feedback mechanism allows the autonomous transmitter to gain awareness of the channel environment at the receiver side without reducing its autonomous operation, thereby preventing collisions caused by information asymmetry.

Inventive Principle:

Principle #23Feedback

3Reliability

If the transmitter UE requests and processes resource assistance information from the receiver UE, then collision-free reception is achieved, but the transmitter UE processing power and communication overhead increase

Engineering Contradiction:

Improvecollision-free receptionVSAvoidtransmitter UE processing power

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements a selective feedback mechanism where the receiver UE provides resource assistance information only when necessary (e.g., when collision risk is detected or channel conditions deteriorate). This partial action approach maintains collision-free reception reliability while minimizing the increase in transmitter processing power and communication overhead.

Inventive Principle:

Principle #16Partial or excessive action

4Productivity

If UEs use autonomous resource selection without coordination, then resource allocation is flexible and efficient, but half-duplex issues occur for UEs belonging to the same group

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidhalf-duplex operation reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent combines autonomous resource selection with coordinated feedback mechanisms. UEs maintain flexible autonomous resource selection for efficiency, while simultaneously exchanging coordination information through feedback channels to resolve half-duplex conflicts, achieving both productivity and reliability.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12598630B2User equipment and resource selection method in sidelink communication

Publication Date: 2026.04.07 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A user equipment (UE) and a resource selection method in sidelink communication are provided. The resource selection method by a first UE includes requesting a second UE to provide a set of resources by transmitting, to the second UE, a UE assistance information (UEAI) or a scheduling request/buffer status report (SR/BSR) information, receiving the set of resources from the second UE, and selecting or avoiding selecting one or more resources from the set resources for sidelink transmission. This can solve issues in the prior art, avoid transmission collisions with one or more hidden UEs, avoid a half-duplex issue for UEs belong to a same group, save a transmitter UE processing power, provide a good communication performance, and/or provide high reliability.