RIS-Assisted Timing Error Calibration for Mobile Positioning
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Solution Overview
Problem
Existing wireless communication networks lack effective utilization of Reconfigurable Intelligent Surfaces (RIS) for timing error calibration in mobile device positioning, limiting the accuracy of location determination.
Innovation Solution
A method and device utilizing RIS-assisted calibration for timing errors in wireless nodes, involving measurements of RF signals reflected by RISs to determine a mobile device's position, using differential values and known locations of wireless nodes and RIS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional wireless nodes are used for positioning measurements, then the positioning system can operate with existing infrastructure, but timing errors reduce the accuracy of location determination
Solution Approach 1:
The patent introduces RIS (Reconfigurable Intelligent Surface) as an intermediary component between wireless nodes and mobile devices. The RIS reflects RF signals to create additional measurement paths, enabling timing error calibration without requiring direct modification of existing wireless node infrastructure. This intermediary approach allows the system to maintain compatibility with current networks while improving positioning accuracy through differential timing measurements.
2Measurement precision
If RIS is utilized for signal reflection to improve positioning, then timing error calibration is enhanced, but the system complexity increases due to additional measurement paths
Solution Approach 1:
The patent makes the RIS serve multiple functions: it acts as both a signal reflector for extending coverage and a calibration reference for timing error correction. By configuring the RIS to reflect signals from multiple wireless nodes, the system uses the same infrastructure component for both positioning enhancement and error calibration, reducing the need for separate dedicated calibration infrastructure.
Solution Approach 2:
The system performs self-calibration by using the RIS-reflect ed signal paths themselves as the calibration reference. The mobile device measures timing differences between direct and reflected signals, and between signals from different wireless nodes reflected by the same RIS, enabling the system to automatically characterize and compensate for timing errors without external calibration equipment.
3Measurement precision
If multiple wireless nodes and RIS are used for calibration, then positioning accuracy improves, but the computational processing requirements increase
Solution Approach 1:
The patent performs preliminary timing error calibration computations using measurements from multiple wireless nodes and RIS configurations before final position estimation. By pre-characterizing timing errors through differential measurements and storing calibration parameters, the system reduces the computational burden during actual positioning operations, as the error compensation can be applied through pre-calculated correction factors rather than real-time complex optimization.
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
Enhances the accuracy of mobile device positioning by compensating for timing errors through RIS-assisted calibration, improving the precision of location estimation.
Implementation Method 1
a third measurement of one or more wireless reference signals reflected by a RIS while traveling between the mobile device and the first wireless node, and a fourth measurement of one or more wireless reference signals reflected by the RIS while traveling between the mobile device and the second wireless node
Data Source
AI summary
Techniques for reconfigurable intelligent surface (RIS)-assisted calibration for timing errors in wireless nodes may comprise obtaining a set of wireless reference signal measurements comprising: first, second, third, and fourth measurements of reference signals traveling between the mobile device, a first wireless node, and a second wireless node, wherein a portion of the reference signals are reflected by the RIS while traveling between the mobile device and the first or second wireless node. A differential value comprising a difference between the third measurement and the fourth measurement is also obtained. Determining a position estimate of the mobile device may then be performed, based at least in part on the set of wireless reference signal measurements, the differential value, and a respective location of each of the first wireless node, the second wireless node, and the RIS.