Propagation Path Reporting for NLOS Cellular Positioning
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Solution Overview
Problem
In cellular positioning systems, the non-line of sight (NLOS) distances between base stations and terminal devices introduce significant measurement deviations, leading to inaccuracies in positioning due to the reflection of positioning reference signals, which are not accounted for in existing methods.
Innovation Solution
A method where a first device measures and reports both measurement results and propagation path information to a positioning device, enabling the positioning device to accurately combine these data for improved positioning accuracy, especially in NLOS scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device measures the positioning reference signal in an NLOS scenario, then the positioning can be performed, but the measurement result has large deviation due to signal reflection
Solution Approach 1:
The patent segments the positioning measurement process by separating LOS and NLOS measurement results. The terminal device identifies and reports propagation path information (LOS or NLOS) along with measurement results, allowing the positioning device to process different path types separately. This segmentation enables the positioning device to handle NLOS deviations by combining multiple measurement results with known path characteristics, thereby improving overall positioning accuracy in mixed environments.
Solution Approach 2:
The patent introduces propagation path information as an intermediary element between the measurement process and positioning calculation. By reporting path information (indicating whether a path is LOS or NLOS) along with measurement results, the positioning device can use this intermediary data to weight, filter, or adjust the measurement results appropriately, reducing the harmful effect of NLOS signal reflections on positioning accuracy.
2Ease of operation
If the terminal device reports only measurement results without propagation path information, then the reporting is simple, but the positioning accuracy deteriorates due to inability to distinguish LOS and NLOS paths
Solution Approach 1:
The patent applies preliminary action by having the terminal device identify and report propagation path information (LOS or NLOS) in advance along with the measurement results. This preliminary classification of path types enables the positioning device to perform more accurate positioning calculations by knowing which measurements are from direct paths and which are from reflected paths, thereby improving positioning accuracy without significantly complicating the reporting process.
3Adaptability or versatility
If the positioning device uses NLOS measurement results for positioning, then positioning can be performed in obstructed environments, but the positioning accuracy decreases due to measurement deviation
Solution Approach 1:
The patent merges multiple measurement results (both LOS and NLOS) along with their corresponding propagation path information to perform positioning. By combining these measurements and using the path information to appropriately weight or adjust their contributions, the positioning device can maintain positioning capability in NLOS environments while mitigating the accuracy degradation caused by signal reflections through collaborative processing of multiple path types.
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
This approach enhances positioning accuracy by allowing the positioning device to account for the specific propagation paths and reflections, thereby reducing measurement deviations and improving location determination in challenging environments.
Implementation Method 1
An NLOS distance between a base station and the terminal device is a distance of an NLOS path obtained by reflecting, via a reflector, a positioning reference signal sent by the base station to the terminal device
Data Source
AI summary
A signal measurement and reporting method, a positioning method, and a related apparatus, for a first device to send a first measurement result and information about a first propagation path to a positioning device. This helps improve accuracy of positioning the first device or a second device by the positioning device. The first device measures a positioning reference signal sent by the second device, to obtain the first measurement result, where the first measurement result corresponds to the first propagation path, and the first propagation path is a propagation path between the first device and the second device; and the first device sends the first measurement result and the information about the first propagation path to the positioning device.