Collinearity Indicator for Downlink Positioning Accuracy
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Solution Overview
Problem
Current communication systems lack a mechanism for the user equipment (UE) to effectively filter and report measurements from transmission points (TRPs) based on collinearity, leading to reduced positioning accuracy due to geometric dilution of precision and insufficient degrees of freedom in angle-based methods.
Innovation Solution
The UE determines a collinearity indicator for TRP pairs by measuring the relative downlink angle of arrival and compares it to thresholds, excluding or including reference signal time differences and angles in measurement reports accordingly, and informs the network to adjust processing, thereby improving positioning accuracy and network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports measurements from all transmission points, then the quantity of measurement data increases, but positioning accuracy deteriorates due to geometric dilution of precision from collinear TRP pairs
Solution Approach 1:
The patent extracts and removes measurements from collinear transmission point pairs from the measurement report. The UE identifies collinear TRP pairs using a collinearity indicator and excludes their reference signal time difference measurements, thereby preventing geometric dilution of precision while maintaining sufficient measurement data for accurate positioning.
Solution Approach 2:
The patent applies local quality by treating different transmission point pairs differently based on their geometric configuration. Non-collinear TRP pairs are included in measurements with full quality, while collinear pairs are identified and excluded or marked with a collinearity indicator, allowing the network to process only high-quality measurements for positioning calculation.
2Productivity
If the UE includes all reference signal time differences in the measurement report, then the completeness of positioning data improves, but network processing efficiency deteriorates due to redundant collinear measurements
Solution Approach 1:
The patent extracts collinear transmission point pairs from the complete set of measurement data and either excludes them from the measurement report or marks them with a collinearity indicator. This prevents redundant collinear measurements from consuming network processing resources while ensuring that essential non-collinear measurements are preserved for accurate positioning.
Solution Approach 2:
The patent performs preliminary filtering of measurement data at the UE side before reporting to the network. By calculating the collinearity indicator and pre-processing measurements to exclude or mark collinear pairs, the UE reduces the processing burden on the network before the data arrives, improving overall system productivity.
3Measurement precision
If the UE calculates and reports collinearity indicators for all transmission point pairs, then positioning accuracy improves by enabling selective filtering, but device complexity increases due to additional angle of arrival measurements and calculations
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously perform collinearity detection and measurement filtering without requiring complex network-side processing. The UE calculates angle of arrival measurements, determines collinearity indicators, and makes intelligent decisions about which measurements to include or exclude, reducing overall system complexity while maintaining high positioning accuracy.
Data Source
AI summary
The disclosure relates to an apparatus including at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured, with the at least one processor, to cause the apparatus at least to: receive a first reference signal from a first transmission point and a second reference signal from a second transmission point; determine a collinearity indicator for the first transmission point and the second transmission point based on a measurement of the first reference signal and a measurement of the second reference signal; and generate a measurement report based on the collinearity indicator.