Sidelink Positioning via Phase Difference Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In sidelink (SL) communication, a terminal may not be able to apply a time difference of arrival (TDOA)-based positioning method due to the condition that it always sends and receives signals with three or more base stations, which is not always satisfied.
Innovation Solution
A method for a first apparatus to perform wireless communication by receiving information related to the absolute position of a positioning reference, obtaining positioning reference signal (PRS) reception timings from multiple apparatuses, and estimating a relative position of the positioning reference to obtain position information of the first apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TDOA-based positioning method is used, then positioning accuracy is improved, but the requirement of receiving signals from three or more base stations increases device complexity and reduces adaptability
Solution Approach 1:
The patent changes the fundamental parameter of positioning reference from multiple base stations (three or more) to a single positioning reference point. This parameter change allows the system to maintain positioning functionality in scenarios where multiple base stations are not available, thereby improving adaptability while still achieving positioning accuracy through alternative measurement approaches using single-reference signal timing and phase information
Solution Approach 2:
The patent segments the positioning measurement process into separate components: obtaining timing information from a single positioning reference, obtaining phase difference information from multiple other reference points, and combining these segmented measurements to achieve positioning. This segmentation allows flexibility in selecting different reference points for different measurement types, improving adaptability to various deployment scenarios
2Measurement precision
If TDOA-based positioning method is used, then positioning accuracy is improved, but the system complexity increases due to requirement of multiple base stations
Solution Approach 1:
The patent reduces the number of positioning reference points required from three or more base stations to just one positioning reference for timing measurements. This parameter reduction simplifies the system architecture and reduces complexity while maintaining positioning accuracy through the complementary use of phase difference measurements from additional reference points
Solution Approach 2:
The patent introduces phase difference measurements as an intermediary mechanism to bridge the gap between single-reference timing measurements and multi-reference TDOA positioning. By using phase differences from multiple reference points as an intermediary, the system achieves positioning accuracy comparable to TDOA without requiring multiple base stations for direct timing measurements
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 allows user equipment (UE) to efficiently perform SL communication by enabling positioning based on one positioning reference, even when the condition of receiving signals from three or more base stations is not met.
Implementation Method 1
obtaining a second PRS reception timing at which a second apparatus receives the PRS from the positioning reference, based on a phase difference value between first RSs received on first subcarriers from the second apparatus; obtaining a third PRS reception timing at which a third apparatus receives the PRS from the positioning reference, based on a phase difference value between second RSs received on second subcarriers from the third apparatus
Data Source
AI summary
A first device receives information related to an absolute location of a positioning reference from the positioning reference; obtains a first PRS reception timing based on a positioning reference signal (PRS) received from the positioning reference; obtains a second PRS reception timing at which a second device receives the PRS from the positioning reference, based on a phase difference value between first RSs received on first subcarriers from the second device; obtains a third PRS reception timing at which a third device receives the PRS from the positioning reference, based on a phase difference value between second RSs received on second subcarriers from the third device; estimates a relative location of the positioning reference, based on the first PRS reception timing, the second PRS reception timing, and the third PRS reception timing; and obtains location information of the first device based on the absolute location and the relative location.