Path-Specific Carrier Phase Measurements for Multipath Positioning
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Solution Overview
Problem
Existing carrier phase-based positioning methods are inaccurate in multipath conditions, particularly for indoor and outdoor deployments, as they fail to distinguish between line-of-sight and additional paths, leading to errors in positioning accuracy.
Innovation Solution
Implement methods and systems to associate carrier phase measurements with specific paths between a transmitter and receiver, enabling reporting of path-specific measurements to a location management function (LMF) for improved positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier phase measurements are used for positioning, then positioning accuracy is improved, but measurement precision deteriorates in multipath conditions due to inability to distinguish between line-of-sight and additional paths
Solution Approach 1:
The patent segments the overall carrier phase measurement into path-specific measurements by identifying and separating line-of-sight paths from additional paths. The UE measures carrier phase separately for each detected path, allowing the system to select only the reliable line-of-sight measurement for positioning calculation, thus resolving the contradiction between achieving high positioning accuracy and maintaining measurement reliability in multipath environments.
2Measurement precision
If path-specific carrier phase measurements are implemented, then positioning accuracy is enhanced, but device complexity increases due to additional path detection and measurement requirements
Solution Approach 1:
The patent implements self-service by having the UE autonomously perform path detection and carrier phase measurement for each identified path without requiring additional network infrastructure or complex external processing. The UE uses its existing receiver to detect propagation paths and measure carrier phase, leveraging available resources to achieve path-specific measurements while minimizing additional system complexity.
Data Source
AI summary
A method (700) by a first radio node (110, 112) for carrier phase-based positioning includes receiving (702), from a second radio node (110, 112), at least one reference signal. The first radio node transmits (704) at least one path carrier phase measurement for at least one detected propagation path between the first radio node and the second radio node. The at least one path carrier phase measurement is based on the at least one reference signal.