Wireless Positioning Timing Compensation for NTN RTT Accuracy
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Solution Overview
Problem
Inaccuracies in round trip time (RTT)-based positioning arise due to differences between the first and second time advances (TAs) in non-terrestrial network (NTN) systems, leading to positioning anomalies.
Innovation Solution
Reporting first information that accounts for both the first and second time differences and/or time advances (TAs) to correct positioning inaccuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTT-based positioning is used in NTN systems, then positioning functionality is provided, but positioning accuracy deteriorates due to differences between first and second time advances
Solution Approach 1:
The patent implements a feedback mechanism where the first communications device reports the first time difference and TA information to the second communications device. The second communications device uses this feedback information to calculate a compensation value and adjust the RTT measurement, thereby compensating for the positioning error caused by TA differences and improving positioning accuracy
Solution Approach 2:
The patent changes the parameter measurement approach by introducing TA information (first TA and second TA) as additional parameters to be reported and processed. By incorporating these TA parameters into the RTT calculation process and applying compensation based on their difference, the system corrects the positioning error and improves measurement precision
2Measurement precision
If TA information is reported and processed, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the first communications device pre-calculate and report the first time difference and TA information before the final positioning calculation is performed. This preparation work is done in advance, allowing the second communications device to simply use the pre-computed values for compensation without performing complex real-time calculations
Data Source
AI summary
A wireless communications method and device are provided. The method includes: transmitting, by a first communications device, first information, wherein a difference between a moment at which the first communications device receives a first positioning signal and a moment at which the first communications device sends a second positioning signal is a first time difference, a time advance (TA) corresponding to a time period for transmitting the first positioning signal is a first TA, a TA corresponding to a time period for transmitting the second positioning signal is a second TA, the first information is related to the first time difference, and the first information is further related to at least one of the first TA or the second TA.