Base-Station Auxiliary Signaling for Sidelink COT on Unlicensed Spectrum

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Solution Overview

Problem

The increasing demand for mobile broadband communication and V2X services requires efficient use of unlicensed spectrum for sidelink communication, particularly in scenarios where traditional listen-before-talk (LBT) methods may not effectively allocate resources for vehicle-to-everything (V2X) communications.

Innovation Solution

A method and device for obtaining information about resource blocks on an unlicensed spectrum, performing listen-before-talk (LBT), and generating a channel occupancy time (COT) to facilitate sidelink transmissions or receptions, excluding certain time domains from the COT allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional listen-before-talk (LBT) methods are used for resource allocation in unlicensed spectrum, then channel access is simplified, but resource allocation effectiveness for V2X communications deteriorates

Engineering Contradiction:

Improvechannel access simplicityVSAvoidresource allocation effectiveness

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent segments the channel occupancy time (COT) into multiple sub-periods, each dedicated to specific V2X communication functions (e.g., sensing, transmission, reception). This segmentation allows traditional LBT to be applied to each sub-period independently while achieving effective resource allocation for V2X services through coordinated scheduling across segments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary channel sensing and COT generation before actual V2X transmission occurs. By performing LBT in advance and pre-allocating time resources based on sensed channel conditions, the system ensures effective resource allocation while maintaining operational simplicity through automated preliminary actions.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If channel occupancy time (COT) is extended to accommodate more sidelink transmissions, then communication capacity increases, but latency in resource allocation increases

Engineering Contradiction:

Improvecommunication capacityVSAvoidresource allocation latency

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent implements periodic COT structures where time resources are divided into repeating cycles of sensing, transmission, and reception periods. This periodic action allows multiple sidelink transmissions to be accommodated within each cycle, increasing communication capacity while maintaining low latency through predictable, rhythmic resource allocation patterns that prevent prolonged waiting times.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250331017A1Operation method by which base station transmits auxiliary information to terminal in order to generate cot of terminal in SL-u, and device

Publication Date: 2025.10.23 LG ELECTRONICS INC

AI summary

Provided are a method for performing wireless communication by a first device, and an apparatus for supporting same. The method may comprise: obtaining information related to a resource block (RB) set on an unlicensed spectrum; performing a listen before talk (LBT) for the RB set; generating a channel occupancy time (COT) based on the LBT; and performing a sidelink transmission or a sidelink reception, based on the COT. For example, a time domain of a resource used for sidelink communication with other devices is not included in the COT.