Sidelink PRS Resource Coordination to Reduce Measurement Interference

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Solution Overview

Problem

In sidelink (SL) positioning, there is a challenge of resource conflicts and measurement interference due to terminal devices autonomously selecting overlapping time-frequency resources for SL positioning reference signal (PRS) transmissions, leading to inefficiencies and potential interference.

Innovation Solution

A first terminal device receives multiple SL PRS configurations from other terminal devices and determines overlapping resources. It then requests a second terminal device to update its SL PRS transmission, such as through muting or changing the SL PRS configuration dynamically, using methods like Code Division Multiplexing (CDM) or orthogonal cover codes (OCC), to resolve resource conflicts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If terminal devices autonomously select time-frequency resources for SL PRS transmissions, then positioning can be performed without network coordination, but resource conflicts and measurement interference occur

Engineering Contradiction:

Improveautonomous resource selectionVSAvoidmeasurement accuracy

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the first terminal device receives SL PRS configurations from multiple terminal devices, determines overlapping resources, and transmits requests to update SL PRS transmissions. This feedback loop enables dynamic coordination to resolve resource conflicts while maintaining autonomous operation, thereby improving measurement accuracy without sacrificing automation.

Inventive Principle:

Principle #23Feedback

2Productivity

If terminal devices transmit SL PRS on overlapping resources, then transmission efficiency is improved, but measurement interference increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidmeasurement interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent employs dynamic SL PRS transmission updates where terminal devices can modify their transmission parameters based on real-time coordination requests. This dynamic adjustment allows the system to maintain high transmission efficiency by allowing overlapping resources while preventing measurement interference through on-demand configuration changes.

Inventive Principle:

Principle #15Dynamics

3Reliability

If complete reconfiguration of SL PRS settings is performed to resolve conflicts, then measurement interference is eliminated, but latency and disruption increase

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Instead of requiring complete reconfiguration of SL PRS settings, the patent applies partial updates only to the specific overlapping resources that cause interference. This partial action approach eliminates measurement interference in conflict areas while maintaining existing efficient configurations elsewhere, thereby reducing latency and disruption.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250338245A1Devices, methods, apparatuses and computer readable medium for communications

Publication Date: 2025.10.30 NOKIA TECHNOLOGIES OY

AI summary

Embodiments of the present disclosure disclose devices, methods and apparatuses for a beam reporting. A first terminal device receives a plurality of sidelink (SL) positioning reference signal (PRS) configurations from a plurality of terminal devices. The first terminal device determines, based on the plurality of SL PRS configurations, whether the plurality of terminal devices select overlapping resources for a plurality of SL PRS transmissions. Based on determining that the plurality of terminal devices select overlapping resources for the plurality of SL PRS transmissions, the first terminal device transmits, to a second terminal device among the plurality of terminal devices, a request to update an SL PRS transmission by the second terminal device.