Sidelink Feedback Mechanism for Half Duplex Collision Detection

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Solution Overview

Problem

Existing wireless communication systems face challenges in detecting and mitigating medium contention events, such as half-duplex operations and collisions, in sidelink channels of 5G NR networks, which can lead to interference and degraded performance.

Innovation Solution

A method and apparatus for wireless communication that enable the detection and mitigation of medium contention events by receiving transmissions from multiple UEs on sidelink channels, determining medium contention events based on range or quality conditions, and transmitting feedback to address these events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple UEs transmit on sidelink channels simultaneously, then communication productivity increases, but medium contention events occur causing interference and degraded reliability

Engineering Contradiction:

Improvecommunication productivityVSAvoidcommunication reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where UEs transmit feedback signals to indicate medium contention events. The receiving UE sends feedback transmissions to the transmitting UE when contention events are detected, enabling corrective actions to maintain reliability while allowing simultaneous transmissions to improve productivity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces feedback transmissions as intermediary signals that mediate between simultaneous transmitting UEs and the receiving UE. These feedback signals carry information about medium contention events and enable coordination without requiring the UEs to directly detect each other's transmissions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Difficulty of detecting and measuring

If UE detects medium contention events by receiving transmissions from multiple UEs, then detection capability improves, but device complexity increases

Engineering Contradiction:

Improvemedium contention detection capabilityVSAvoidUE complexity

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The patent enables the receiving UE to perform self-service by using its own received signals to detect medium contention events. The UE monitors transmissions from multiple UEs and automatically identifies contention events based on the received signals, eliminating the need for complex external detection systems.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent makes the receiving UE multi-functional by enabling it to both receive communications and detect medium contention events simultaneously. The same reception infrastructure is used for both purposes, avoiding the need for separate dedicated detection hardware and reducing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12267868B2SL reliability enhancement by half duplex and collision detection

Publication Date: 2025.04.01 QUALCOMM INC

AI summary

In one aspect, a method of wireless communication includes receiving, by a first user equipment (UE), a first transmission from a second UE for a new radio (NR) sidelink channel. The method also includes receiving, by the first UE, a second transmission from a third UE for the sidelink channel. The method further includes transmitting, by the first UE, a feedback transmission based on a medium contention event for the first and second transmissions of the NR sidelink channel and on a range condition. In additional aspects, the feedback transmission is transmitted based on a quality condition, or both a range condition and a quality condition. Other aspects and features are also claimed and described.