SL-PRS Transmit Power Control for Low-Interference Sidelink Positioning

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems, particularly in 5G, face challenges in efficiently managing transmit power levels for sidelink positioning reference signals (SL-PRS) to support accurate positioning in vehicle-to-everything (V2X) applications, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), and vehicle-to-pedestrian (V2P) communications, which are crucial for autonomous driving and safety.

Innovation Solution

The method involves transmitting sidelink positioning reference signals (SL-PRS) at a power level less than or equal to the maximum permitted level, enabling effective sidelink positioning sessions between user equipment (UEs) to enhance positioning accuracy and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If higher transmit power levels are used for SL-PRS, then positioning accuracy is improved, but interference to other communications increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidinterference

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the transmit power level of SL-PRS based on measured interference conditions. The UE monitors interference metrics and modifies the power parameter accordingly, transitioning between different power levels to balance positioning accuracy requirements with interference mitigation needs in the wireless environment.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements feedback mechanisms where the UE continuously monitors interference levels caused by SL-PRS transmissions and uses this information to adjust subsequent transmit power levels. This closed-loop feedback system enables the system to adapt to changing channel conditions and maintain optimal positioning accuracy while minimizing harmful interference to other communications.

Inventive Principle:

Principle #23Feedback

2Reliability

If higher transmit power levels are used for SL-PRS, then signal reliability is improved, but energy consumption increases

Engineering Contradiction:

Improvesignal reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the transmit power level adaptive rather than static. The UE dynamically adjusts power levels based on real-time positioning requirements and channel conditions, using higher power only when necessary for reliable positioning measurements and reducing power when conditions permit, thereby optimizing the balance between signal reliability and energy consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the power parameter dynamically based on positioning session requirements and measured channel conditions. By adjusting the transmit power level parameter in response to changing conditions, the system maintains adequate signal reliability for positioning while minimizing unnecessary energy consumption during periods when lower power suffices.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250386316A1Transmit power level for sidelink positioning reference signals (SL-PRS)

Publication Date: 2025.12.18 QUALCOMM INC

AI summary

In an aspect, a user equipment (UE) may engage in a sidelink positioning session with at least one other UE. The UE may transmit at least one sidelink positioning reference signal (SL-PRS) to the at least one other UE at a transmit power level, where the transmit power level is less than or equal to a maximum permitted transmit power level for transmission of SL-PRS.