Sidelink Positioning Anchor Tone Phase Difference Calculation
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Solution Overview
Problem
In wireless communication systems supporting sidelink communication, estimating distance information from ambiguous phase difference information is challenging, and phase errors are significant due to channel phase variations.
Innovation Solution
A method where a user equipment (UE) transmits positioning information by calculating phase differences between reference signals, with one of the tones serving as an anchor tone, and the network estimates distance information accurately by summing these phase differences, minimizing phase errors based on channel variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase differences are measured between reference signals on multiple tones for distance estimation, then positioning information can be obtained, but phase ambiguity occurs leading to inaccurate distance estimation
Solution Approach 1:
The patent segments the phase difference measurement process by designating one specific tone as an anchor tone and another as a target tone, rather than measuring between all possible tone pairs. This segmentation reduces the complexity and ambiguity of phase difference measurements, enabling reliable distance estimation by focusing on specific tone pairs where the phase relationship can be accurately determined.
2Measurement precision
If reference signals are transmitted on multiple tones to improve positioning accuracy, then more positioning information is available, but phase errors increase due to channel phase variations
Solution Approach 1:
The patent introduces an anchor tone as an intermediary reference point that mediates the phase difference measurements between reference signals on different tones. By using this intermediate anchor tone, the system can calculate phase differences in a way that compensates for channel phase variations, thereby reducing phase errors while maintaining the benefits of multi-tone reference signal transmission.
Data Source
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AI summary
Disclosed are a method for a terminal transmitting positioning information in a wireless communication system supporting sidelink and a device therefor according to various embodiments. Disclosed are a method for a terminal transmitting positioning information and a device therefor, the method comprising the steps of: receiving, from a network or a transmission terminal, a positioning signal comprising N consecutive tones to which reference signals are mapped; measuring the phase difference between a reference signal, which is mapped to an anchor tone which is a reference among the N consecutive tones, and the reference signals respectively mapped to the remaining tones; and transmitting, to the network or the transmission terminal, positioning information comprising information relating to the measured phase difference, wherein the positioning information comprises information relating to the sum of the measured phase differences between the reference signals.