Sidelink PRS Power Control for Accurate, Low-Interference Positioning
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Solution Overview
Problem
Current wireless communication systems lack efficient power control mechanisms for sidelink positioning reference signals (PRS) transmission, particularly in sidelink (SL) communications, which are essential for accurate and interference-free positioning in V2X, public safety, and industrial internet of things (IIoT) scenarios, due to varying mobility and distributed nodes.
Innovation Solution
Implement power control enhancements for sidelink PRS transmission, including adaptive power control based on path loss references, muting configurations, and open loop power control mechanisms to ensure detectability and minimize interference, applicable to one-to-one and groupcast SL positioning methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed transmit power is used for SL PRS transmission, then device complexity is reduced, but positioning accuracy deteriorates due to inability to adapt to varying path loss conditions
Solution Approach 1:
The patent implements dynamic power control by transitioning from fixed transmit power to adaptive power adjustment. The initiator device dynamically determines the SL PRS transmit power based on received RSS measurements and path loss references, allowing the system to adapt to varying channel conditions while maintaining positioning accuracy.
Solution Approach 2:
The patent employs feedback mechanisms where the responder device reports RSS measurements to the initiator device, which then uses this feedback information to adjust the transmit power. This closed-loop feedback enables continuous optimization of power levels based on actual reception conditions.
2Reliability
If high transmit power is used for SL PRS transmission, then signal detectability is improved, but interference with other signals increases
Solution Approach 1:
The patent changes the transmit power parameter dynamically based on path loss references and RSS measurements. By adjusting the power level according to actual channel conditions rather than using a fixed high power, the system achieves sufficient detectability while minimizing interference with other sidelink signals.
Solution Approach 2:
The patent applies partial power adjustment rather than maximum power transmission. The initiator device calculates appropriate power levels based on path loss references, transmitting only enough power to achieve reliable detection without excessive power that would cause harmful interference to other signals.
3Measurement precision
If power control is implemented for SL PRS transmission, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service power control where the initiator device autonomously determines appropriate transmit power levels using locally available path loss references and received RSS measurements. This self-contained approach eliminates the need for complex centralized control while maintaining positioning accuracy.
Data Source
AI summary
Various aspects of the present disclosure relate to techniques for SL power control for PRS transmission. An apparatus is configured to receive a configuration for adapting a transmit power of a SL PRS transmission for a responder device, receive a reported RSS measurement from the responder device, and adapt the SL PRS transmit power for the responder device based on the received configuration and the RSS measurement.