Sidelink COT Sharing Using Wake-Up Signals After LBT Access

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Solution Overview

Problem

In unlicensed spectrum communication systems, the listen-before-talk (LBT) procedure is inefficient, leading to suboptimal channel occupancy and resource utilization in sidelink (SL) communications, particularly in scenarios like device-to-device (D2D) and vehicle-to-everything (V2X) communications.

Innovation Solution

A method for SL communication that involves transmitting first information upon accessing a channel via an LBT procedure to indicate COT sharing information, using a power-saving wake-up signal (WUS) to facilitate COT sharing between terminals, enhancing resource utilization and reducing contention for unlicensed channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a terminal performs LBT procedure before transmitting signals on unlicensed spectrum, then channel access is achieved, but channel occupancy time is reduced and resource utilization is suboptimal

Engineering Contradiction:

Improvechannel access reliabilityVSAvoidchannel occupancy time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent introduces COT sharing information as an intermediary mechanism that allows one terminal to share its acquired channel occupancy time with other terminals. This mediator enables multiple terminals to utilize the same COT without each performing independent LBT procedures, thereby extending effective channel occupancy while maintaining reliable channel access through the original LBT performer.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple terminals perform independent LBT procedures, then each terminal can access the channel independently, but channel contention increases and resource utilization decreases

Engineering Contradiction:

Improveindependent channel access capabilityVSAvoidresource utilization

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges multiple independent LBT procedures into a single shared COT mechanism. Instead of each terminal performing separate LBT and acquiring separate COTs, one terminal performs LBT and acquires COT that is then shared among multiple terminals. This combining approach reduces overall channel contention while maintaining the ability of multiple terminals to access the channel, thereby improving resource utilization.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If COT sharing is implemented in SL communication, then resource utilization is improved, but system complexity increases due to additional signaling

Engineering Contradiction:

Improveresource utilizationVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts COT sharing information as a separate, standardized signaling element that can be independently processed. By defining specific fields (such as COT indicator, duration, and resource allocation) as distinct extractable components, the system manages complexity through structured information separation rather than monolithic complex protocols, making implementation more manageable while achieving improved resource utilization.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20260020061A1Method for sidelink communication and communication devices

Publication Date: 2026.01.15 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided is a method for sidelink (SL) communication. The method is performed by a first terminal, and includes: transmitting first information upon accessing a channel via a listen-before-talk (LBT) procedure, wherein the first information is used to indicate channel occupancy time (COT) sharing information. The first information is transmitted within a COT acquired by the first terminal upon accessing the channel via the LBT procedure.