Sidelink PRS Transmission Using Shared COT on Unlicensed Spectrum

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Solution Overview

Problem

The challenge of sharing Channel Occupancy Time (COT) between User Equipments (UEs) when sending Sidelink Positioning Reference Signals (SL PRS) on unlicensed spectrum is unresolved in existing wireless communication systems.

Innovation Solution

A method and apparatus for sending SL PRS, where an Initiating User Equipment (IUE) sends indication information to a Responding UE (RUE) to facilitate channel access and transmission of the first Physical Sidelink Control Channel (PSCCH) and first SL PRS, allowing the RUE to share the COT with the IUE.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the RUE performs independent LBT to access the channel for sending SL PRS, then the RUE can autonomously access the channel, but the channel access success rate decreases and transmission efficiency is reduced

Engineering Contradiction:

Improvechannel access success rateVSAvoidtransmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The IUE acts as an intermediary that performs LBT on behalf of both itself and the RUE. The IUE sends indication information to the RUE, allowing the RUE to send SL PRS within the IUE's COT without performing independent LBT. This mediator approach resolves the contradiction by centralizing channel access control, improving both access success rate and transmission efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the RUE shares the COT with the IUE, then the transmission efficiency improves, but the device complexity increases due to COT sharing management

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidCOT sharing management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The IUE autonomously manages the COT sharing process by sending indication information to the RUE. The RUE simply follows the indication to send SL PRS within the allocated COT. This self-service approach by the IUE reduces the overall system complexity while maintaining high transmission efficiency, as the RUE does not need complex COT management capabilities.

Inventive Principle:

Principle #25Self-service

3Reliability

If the IUE sends indication information to the RUE, then the COT sharing is enabled, but the loss of information increases due to additional signaling

Engineering Contradiction:

ImproveCOT sharing reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The indication information sent by the IUE contains only the essential parameters needed for COT sharing (such as COT length and resource allocation), rather than complete channel access details. This partial action approach enables COT sharing while minimizing signaling overhead and information loss.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP4654683A1Sidelink positioning reference signal transmission method and apparatus, device, and medium

Publication Date: 2025.11.26 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

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AI summary

A sidelink positioning reference signal transmission method and apparatus, a device, and a medium, which relate to the field of wireless communications. The method is applied to a responding terminal, and comprises: according to indication information from an initiating terminal, accessing a channel, and sending a first physical sidelink control channel PSCCH and a first sidelink positioning reference signal SL PRS (210). The method allows a responding terminal to send an SL PRS according to an indication from an initiating terminal, thereby achieving the responding terminal sharing the COT of the initiating terminal.