Positioning Server Shortest Path Selection for NLOS Error Reduction
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Solution Overview
Problem
Current positioning methods, such as OTDOA, face accuracy issues due to non-line-of-sight (NLOS) path deviations and signal strength losses, particularly in urban and indoor environments, leading to increased positioning errors.
Innovation Solution
The proposed method involves determining and using the shortest transmission path between positioning signal measurement and sending entities, which is closest to a line-of-sight (LOS) path, to improve positioning accuracy. This is achieved by configuring positioning signals with increased transmit power and/or additional time/frequency domain resources based on environmental and channel propagation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional positioning methods (OTDOA, CID) are used, then positioning can be implemented with basic signal measurement, but positioning accuracy deteriorates due to NLOS path deviations and signal strength losses in urban and indoor environments
Solution Approach 1:
The patent changes the parameter of path selection from using any received signal path to specifically selecting the shortest transmission path. This parameter change in the measurement approach eliminates NLOS path deviations by focusing only on the direct LOS path, thereby improving positioning accuracy in urban and indoor environments where NLOS conditions prevail
Solution Approach 2:
The patent segments the received signals into multiple transmission paths and identifies the shortest path among them. By separating and evaluating individual paths, the system can select the LOS path (shortest path) while excluding NLOS paths, thus resolving the accuracy issue caused by harmful propagation paths
2Measurement precision
If positioning signals are transmitted with standard power and resources, then system complexity remains low, but positioning accuracy deteriorates due to signal strength losses in challenging environments
Solution Approach 1:
The patent dynamically adjusts positioning signal transmission parameters including power levels and time-frequency resources based on environmental conditions and measured signal characteristics. This dynamic adaptation ensures sufficient signal strength for accurate shortest path identification in challenging environments while avoiding excessive resource consumption when conditions are favorable
Data Source
AI summary
Embodiments of the present invention provide a positioning method, including: determining, by a positioning server, positioning signal configuration information; sending, by the positioning server, the positioning signal configuration information to a positioning signal sending entity; obtaining, by the positioning server, a measurement estimation result of a shortest transmission path between a positioning signal measurement entity and the positioning signal sending entity; and positioning, by the positioning server, a terminal by using the measurement estimation result of the shortest transmission path, where the terminal is one of the positioning signal measurement entity and the positioning signal sending entity. The embodiments of the present invention can resist an NLOS path deviation and a positioning signal strength loss and an SINR loss, so as to improve the positioning accuracy.