UE Position Estimate Quality Using LOS Postfit Residuals
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Solution Overview
Problem
Existing positioning methods fail to accurately assess the accuracy of position estimates for mobile devices due to signal obstructions from natural and man-made barriers, affecting the reliability of location determination.
Innovation Solution
The method involves identifying line-of-sight (LOS) devices based on signal measurements, calculating LOS postfit residuals, and determining a quality metric for the position estimate using these residuals to assess the accuracy independently of the positioning algorithm used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-synchronized signals are used for position determination, then location can be determined, but resolution is reduced when signals are obstructed by barriers
Solution Approach 1:
The patent segments the signal measurements by classifying them into LOS (line-of-sight) and NLOS (non-line-of-sight) categories. This segmentation allows the system to separately process high-quality LOS measurements from lower-quality NLOS measurements, thereby maintaining location resolution while compensating for signal obstructions through selective weighting and quality assessment.
Solution Approach 2:
The patent changes the parameter of signal quality assessment by introducing LOS postfit residuals as a new metric. This parameter change enables the system to evaluate and differentiate measurement quality based on LOS characteristics, allowing for improved location determination even when some signals are obstructed by adjusting the influence of different measurement types.
2Measurement precision
If position estimate quality assessment is performed using traditional methods, then location can be determined, but accuracy cannot be directly assessed due to signal obstructions
Solution Approach 1:
The patent implements feedback by calculating LOS postfit residuals and using them to determine a quality metric for the position estimate. This feedback mechanism provides direct information about the accuracy of the position estimate by comparing expected LOS measurements with actual measurements, enabling applications to assess whether the reported position meets quality thresholds.
Solution Approach 2:
The patent replaces traditional mechanical positioning assessment methods with a signal-based quality metric system. By substituting physical measurement validation with statistical analysis of LOS postfit residuals, the system can directly assess position estimate accuracy without being constrained by traditional mechanical verification methods that fail in obstructed environments.
Data Source
AI summary
A method for assessing a quality of a position estimate for a user equipment (UE) includes: identifying one or more devices as a line-of-sight (LOS) device based on a classification of one or more measurements from the one or more devices as being LOS measurements; determining one or more LOS postfit residuals for each LOS device based on the position estimate for the UE and the LOS measurements from the LOS device; and determining a quality metric for the position estimate for the UE based on the one or more LOS postfit residuals corresponding to the LOS devices.