Sidelink Positioning Accuracy via NLOS Signal Removal
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Solution Overview
Problem
Current sidelink positioning technologies in V2X communication face challenges such as the need for high-precision synchronization, significant bandwidth requirements, and multipath reception issues due to non-line-of-sight (NLOS) signals in dynamic environments like roads.
Innovation Solution
A method that improves the accuracy of positioning procedures by tracking another user equipment's position, obtaining and receiving position information via sidelink channels, requesting environment information, determining reflection paths using geometric models, and removing NLOS signals from line-of-sight signals to enhance positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink positioning is used in V2X communication, then location information can be provided for improved safety and efficiency, but multipath reception from non-line-of-sight signals degrades positioning accuracy
Solution Approach 1:
The patent converts harmful NLOS multipath signals into beneficial information by using environmental reflection models to predict and identify these signals. Instead of treating reflections as mere interference, the system models expected reflection paths using HD map data and geometric relationships, then uses this knowledge to selectively remove or compensate for identified NLOS components, transforming a detrimental effect into an opportunity for improved positioning accuracy
Solution Approach 2:
The patent introduces environmental information from HD maps as an intermediary element between the transmitter and receiver. This external knowledge source provides prior information about reflectors and environmental geometry, which mediates the signal processing by enabling the system to predict reflection paths and distinguish NLOS signals from LOS signals before they interfere with positioning measurements
2Measurement precision
If high-precision synchronization is implemented, then positioning accuracy can be improved, but system complexity and bandwidth requirements increase
Solution Approach 1:
The patent performs preliminary actions by pre-acquiring environmental information from HD maps before the positioning measurement takes place. The system pre-processes this environmental data to create models of expected reflection paths and uses these models during signal processing. This preliminary preparation reduces the complexity of real-time synchronization by providing advance knowledge that simplifies the identification and handling of NLOS signals during the actual positioning procedure
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 method significantly improves the accuracy and reliability of sidelink positioning, reduces the negative impact of interfering reflections, and provides real-time location information essential for enhanced safety and efficiency in V2X applications.
Implementation Method 1
In the context of positioning, one challenge can be a multipath reception, also called non line-of-sight (NLOS). In the context of vehicular systems these NLOS paths are created by the reflection of the radio wave on objects such as the ground, vehicles, buildings, or road signs.
Data Source
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AI summary
The invention relates to a method (100) for improving the accuracy of a positioning procedure for a user equipment (10), comprising the following steps: - Tracking (101) a position of another user equipment (20) based on a locating of the other user equipment (20) using a positioning procedure via a sidelink channel, - Obtaining (102) a position information of the user equipment (10) based on a positioning procedure, - Receiving (103) a further position information from the other user equipment (20) based on a positioning reference signal via a sidelink channel, - Requesting (104) an information regarding an environment, specifically a driving environment, of the user equipment (10) related to a reflector (5), - Determining (105) a reflection path (2) with a reflection point (3) based on a geometric model using the requested information, and/or each respective position information and/or a tracked previous position of the other user equipment (20) to identify a corresponding non-line-of sight signal, - Removing (106) the non-line-of sight signal from a received line-of-sight signal (1) based on the determined reflection path (2) to improve the accuracy of the positioning procedure.