Sidelink Positioning Reference Signal Anchor Selection

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Solution Overview

Problem

Current New Radio (NR) vehicular communication systems face challenges in efficiently managing sidelink positioning resources and determining the optimal anchor WTRUs for positioning services, leading to suboptimal positioning accuracy and resource utilization.

Innovation Solution

The system and method involve a target WTRU determining whether to request SL-PRS transmission from one or multiple anchor WTRUs based on positioning Quality of Service (QoS) requirements, using DL-PRS configuration, detected anchor WTRUs, and SL-PRS measurement results, and performing SL-PRS and DL-PRS measurements and reporting to the network.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If SL-PRS transmission is requested from multiple anchor WTRUs to improve positioning accuracy, then positioning precision improves, but resource utilization and system complexity increase

Engineering Contradiction:

Improvepositioning accuracyVSAvoidresource management complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system dynamically selects anchor WTRUs based on real-time positioning QoS requirements, DL-PRS configuration, and measurement results. The target WTRU determines whether to request SL-PRS transmission from one or multiple anchor WTRUs adaptively, rather than using a fixed number of anchors, thus optimizing the balance between positioning accuracy and resource utilization

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameter of the number of anchor WTRUs based on positioning QoS requirements. When higher positioning accuracy is needed, more anchor WTRUs are selected; when resource efficiency is prioritized, fewer anchors are used. This parameter adaptation resolves the contradiction between positioning precision and system complexity

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If DL-PRS measurement and SL-PRS measurement are both performed to improve positioning accuracy, then positioning precision improves, but energy consumption and processing complexity increase

Engineering Contradiction:

Improvepositioning accuracyVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The system performs DL-PRS measurement and SL-PRS measurement selectively based on positioning QoS requirements. Not all measurements are performed in all scenarios - the system performs only the necessary measurements to achieve the required positioning accuracy, avoiding excessive energy consumption while maintaining sufficient positioning precision

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20240188153A1NR positioning - methods for resource provision in sidelink positioning

Publication Date: 2024.06.06 INTERDIGITAL PATENT HOLDINGS INC

AI summary

The system and method includes PRS scheduling, SL-PRS request and transmission. PRS measurement and report, and autonomous positioning transmission and reporting. The system and method for a WTRU to provision sidelink positioning includes configuring the WTRU with a sidelink positioning service and an associated destination identification (ID), receiving DL-PRS and measurement reporting configuration from a network, transmitting an SL (sidelink)-PRS (positioning reference signal) transmission/reception request using the destination ID to at least one other WTRU requesting the at least one other WTRU to transmit SL-PRS, the request including at least one parameter based on the received measurement reporting configuration and QoS of a positioning service, and performing a PRS measurement and reporting the measurement to the network.