Channel Latency Determination for TOA Positioning Calibration
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Solution Overview
Problem
Existing TOA/TDOA-based positioning methods suffer from significant errors due to unestimated channel latency differences between base stations, leading to inaccurate distance calculations and reduced positioning precision.
Innovation Solution
A method to determine channel latency by calculating the propagation delay and time of arrival using a calibration UE, allowing for the subtraction of channel latency from positioning calculations, thereby improving precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TOA/TDOA-based positioning is performed without channel latency estimation, then positioning can be implemented using existing algorithms, but positioning precision deteriorates due to uncorrected channel latency differences
Solution Approach 1:
The patent performs channel latency estimation as a preliminary calibration step before positioning. A calibration UE is used to measure channel latencies of multiple base stations in advance, and these latency values are stored for subsequent positioning corrections. This preliminary action separates the complexity of latency measurement from the real-time positioning process, improving precision without significantly increasing positioning system complexity.
Solution Approach 2:
The patent introduces a calibration UE as an intermediary device to measure channel latencies. This calibration UE acts as a mediator between the base stations and the positioning system, enabling accurate latency measurement without requiring modifications to the base station hardware or signaling protocols, thus resolving the contradiction between precision and complexity.
2Measurement precision
If channel latency is not corrected in distance calculations, then calculation process remains simple, but distance measurement accuracy deteriorates
Solution Approach 1:
The patent performs channel latency estimation as a preliminary calibration step before positioning. A calibration UE is used to measure channel latencies of multiple base stations in advance, and these latency values are stored for subsequent positioning corrections. This preliminary action separates the complexity of latency measurement from the real-time positioning process, improving precision without significantly increasing positioning system complexity.
Solution Approach 2:
The patent uses measured channel latency values as feedback to correct distance calculations in TOA/TDOA positioning. The calibration process provides latency compensation parameters that are fed back into the positioning algorithm, enabling accurate distance measurement while maintaining calculation simplicity through pre-computed correction values.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurate measurement of channel latency enables precise positioning by correcting for latency differences, enhancing the accuracy of TOA/TDOA mechanism-based positioning methods.
Implementation Method 1
A propagation delay is calculated based on the device location information and prestored location information of an antenna, where the propagation delay is a time from transmitting a radio signal by the calibration UE to receiving the radio signal by the antenna
Implementation Method 2
a time of arrival is calculated based on the radio signal transmitted by the calibration UE to the antenna, where the time of arrival is a time obtained through calculation according to a TOA estimation algorithm
Data Source
AI summary
A channel latency determining method, a positioning method, and device, the method including obtaining, by a communications device, device location information of a calibration user equipment (UE), calculating a propagation delay according to the device location information and prestored location information of an antenna, where the propagation delay is a time between transmitting a radio signal by the calibration UE and receiving the radio signal by the antenna, calculating a time of arrival according to the radio signal transmitted by the calibration UE to the antenna, where the time of arrival is a time obtained through calculation according to a time of arrival (TOA) estimation algorithm, and determining a channel latency according to the propagation delay and the time of arrival, where the channel latency is positively correlated with the time of arrival and is negatively correlated with the propagation delay.