Sidelink Feedback Collision Avoidance Across Radio Access Technologies

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Solution Overview

Problem

In wireless communication systems, the coexistence of multiple radio access technologies (RATs) like NR and LTE V2X on the same frequency spectrum leads to sidelink feedback channel collisions, causing degradation in reception performance for UEs unaware of the sidelink feedback resources, which can desensitize receivers and reduce available resources for communication.

Innovation Solution

A UE identifies a first resource for a sidelink feedback channel associated with a first RAT and transmits a reservation for a second resource that overlaps the first resource using a second RAT, allowing other UEs to avoid the sidelink feedback channel, thereby preventing collisions and maintaining reception quality without reducing available resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple RATs share the same frequency spectrum for sidelink communication, then spectral efficiency and resource utilization are improved, but channel collisions occur causing reception performance degradation

Engineering Contradiction:

Improvespectral efficiencyVSAvoidreception performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by having a UE transmit a reservation signal before actually using the sidelink feedback channel resources. This reservation signal is transmitted in advance to notify other UEs of the intended resource usage, allowing them to avoid collisions before they occur. The reservation mechanism proactively prevents channel conflicts rather than reacting to them after they happen.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback through the reservation signaling mechanism where UEs transmit reservation information about their intended sidelink feedback channel usage. This feedback loop allows other UEs to receive and process the reservation signals, adjusting their own resource selection to avoid collisions. The feedback mechanism enables coordinated resource sharing across multiple RATs.

Inventive Principle:

Principle #23Feedback

2Reliability

If reservation signaling is transmitted for every sidelink feedback channel resource, then collision avoidance is improved, but signaling overhead increases

Engineering Contradiction:

Improvecollision avoidanceVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies partial action by transmitting reservation signals only when necessary and only for the specific resources that will be used for sidelink feedback communication. Rather than continuously signaling for all possible resources, the system performs reservation signaling selectively based on actual communication needs, reducing unnecessary overhead while maintaining effective collision avoidance.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250097907A1Signaling for sidelink feedback channel collision avoidance between radio access technologies

Publication Date: 2025.03.20 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a first resource for a sidelink feedback channel associated with the UE, wherein the sidelink feedback channel is associated with a first radio access technology (RAT). The UE may transmit, using a second RAT, a reservation for a second resource that overlaps the first resource. Numerous other aspects are described.