Sidelink Positioning Power Control for Multi-Anchor SL-PRS
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Solution Overview
Problem
Existing positioning methods in 3GPP LTE and NR systems face challenges in achieving precise and efficient positioning, particularly in scenarios requiring ultra-reliable and low-latency communications, such as in 5G and beyond.
Innovation Solution
Control the power transmission of anchor terminals to manage reception power at target terminals, enabling simultaneous transmission and reception of positioning signals to multiple anchor terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple anchor terminals transmit positioning signals simultaneously, then positioning efficiency is improved, but reception power control becomes more difficult
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission power of anchor terminals based on their positions and the target terminal's location. Each anchor terminal transmits positioning signals at different power levels to ensure uniform reception power at the target terminal, enabling simultaneous multi-anchor signaling while maintaining manageable reception power characteristics.
2Reliability
If transmission power of anchor terminals is increased, then positioning signal strength is improved, but interference and power consumption increase
Solution Approach 1:
The patent applies local quality by assigning different transmission power levels to different anchor terminals based on their specific positions relative to the target terminal. Anchors closer to the target terminal transmit at lower power levels, while those farther away transmit at higher power levels, ensuring uniform reception power while minimizing overall energy consumption and interference.
Data Source
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AI summary
One disclosure of the present specification (present disclosure) provides a method by which a UE performs communication. The method comprises the steps of: determining, on the basis of power control information, transmission power for sidelink-difference of arrival (SL-TDOA) for a target UE; and transmitting an SL-positioning reference signal (SL-PRS) to the target UE by using the transmission power, wherein, on the basis that a time point when the SL-PRS is transmitted to the target UE is independent from a time point when another anchor UE transmits an SL-PRS to the target UE, the step for determining the transmission power determines reception power at the target UE for the SL-PRS to be equal to or greater than a threshold value.