Sidelink PRS Power Control for Multi-Device Positioning Reception
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Solution Overview
Problem
The challenge in wireless communication systems is accurately determining the transmission power of sidelink (SL) positioning reference signals (PRS) to ensure they are received by multiple positioning auxiliary devices, which is crucial for precise terminal device positioning.
Innovation Solution
Determine the transmission power of SL PRS based on the path loss of the transmission path, including downlink and SL link path losses, and transmit the SL PRS accordingly to ensure all positioning auxiliary devices can receive it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission power of SL PRS is not accurately determined, then the positioning auxiliary devices may not receive the signal reliably, but increasing the transmission power unnecessarily consumes energy and may cause interference
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission power of SL PRS based on path loss measurements. The transmission power is calculated as P_SL_PRS = P_REF + α*(PL_REF - PL), where P_REF is reference power, PL is current path loss, and α is a power adjustment factor. This dynamic parameter adjustment ensures reliable signal reception while avoiding unnecessary energy consumption by matching transmission power to actual channel conditions.
2Area of stationary object
If the transmission power is increased to ensure reception by multiple positioning auxiliary devices, then the signal coverage is improved, but the interference with other signals increases
Solution Approach 1:
The patent applies local quality by tailoring the transmission power to specific local conditions rather than using a uniform high power setting. Each positioning auxiliary device's reception capability and the channel path loss are considered individually. The transmission power is adjusted locally based on the specific path loss measurement, ensuring sufficient coverage for the actual receiving devices while minimizing interference in the broader environment.
3Manufacturing precision
If path loss measurement and power calculation are performed accurately, then the transmission power is optimized, but the processing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing the power calculation formula and reference parameters before actual transmission. The reference power P_REF and reference path loss PL_REF are determined in advance through system configuration or previous measurements. During transmission, the device only needs to measure the current path loss and substitute values into the pre-defined formula, significantly reducing real-time processing complexity while maintaining precision.
Data Source
AI summary
A method for transmitting a sidelink (SL) positioning reference signal (PRS), performed by a first terminal device, includes: determining a transmission power value of the SL PRS according to a path loss of a transmission path; and transmitting the SL PRS based on the transmission power value.