Sidelink Positioning Reference Signal Trigger Mechanism

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Solution Overview

Problem

There is currently no feasible solution for a terminal to send a positioning reference signal (PRS) over sidelink (SL) communication, particularly under specific conditions.

Innovation Solution

The method involves sending a first-type SL-PRS or a second-type SL-PRS, where the first-type is sent separately and the second-type is associated with a physical sidelink control channel (PSCCH) or physical sidelink shared channel (PSSCH), and includes sending trigger signaling to trigger the terminal to send these PRS types.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a terminal sends SL-PRS separately (first-type), then positioning reference signal transmission is enabled, but resource allocation complexity increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidresource allocation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces trigger signaling as an intermediary mechanism between the network device and terminal. The network device sends trigger signaling to instruct the terminal when and how to send SL-PRS, thereby mediating the resource allocation process and reducing terminal complexity while maintaining positioning accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements dynamic resource allocation where the terminal adapts its SL-PRS transmission based on received trigger signaling. The transmission timing, frequency, and resources are dynamically adjusted according to network instructions rather than being static or purely autonomous, resolving the complexity issue

Inventive Principle:

Principle #15Dynamics

2Productivity

If SL-PRS is associated with PSCCH/PSSCH (second-type), then resource efficiency improves, but positioning signal independence decreases

Engineering Contradiction:

Improveresource efficiencyVSAvoidpositioning signal independence

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent makes the SL-PRS multi-functional by allowing it to be associated with PSCCH/PSSCH for data transmission efficiency while maintaining the capability to be sent separately for independent positioning needs. The same SL-PRS structure serves both positioning and data channel association purposes depending on configuration

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent enables dynamic switching between first-type (separate) and second-type (associated) SL-PRS transmission modes based on trigger signaling and network conditions. This dynamic adaptability allows the system to optimize for either resource efficiency or positioning independence as needed

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If trigger signaling is sent to control SL-PRS transmission, then transmission control accuracy improves, but signaling overhead increases

Engineering Contradiction:

Improvetransmission control accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent implements partial control where trigger signaling is sent only when SL-PRS transmission is needed rather than continuous control signaling. This partial action approach provides precise transmission control accuracy while minimizing signaling overhead by avoiding unnecessary control messages during non-transmission periods

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250038922A1Method for sending positioning reference signal, terminal, and network device

Publication Date: 2025.01.30 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided is a method for sending a positioning reference signal (PRS), applicable to a first terminal. The method includes: sending a first-type sidelink PRS (SL-PRS) or a second-type SL-PRS, wherein the first-type SL-PRS is an SL-PRS separately sent, and the second-type SL-PRS is an SL-PRS associated with a physical sidelink control channel (PSCCH)/physical sidelink shared channel (PSSCH).