Single Base Station Location Estimation via RF Signature Fingerprinting
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Solution Overview
Problem
In wireless communication systems, determining the location of a wireless communication device (WCD) within coverage of a single base station is challenging, as traditional triangulation methods require signals from multiple base stations, and GPS signals may not be available, limiting location-based services.
Innovation Solution
A computing system associates radio frequency (RF) signatures from WCDs with their locations and uses these records to estimate the WCD's location by querying data records for matching RF signatures, combining bearings and distances to determine a representative location, even when the WCD is within coverage of a single base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional triangulation methods are used to determine WCD location, then location accuracy is improved, but the method becomes inapplicable when the WCD is within coverage of only a single base station
Solution Approach 1:
The patent changes the measurement parameter from signal delay (time-based triangulation) to RF signature characteristics (frequency-based fingerprinting). By transitioning from temporal measurement to spectral signature analysis, the system can determine location using a single base station's RF characteristics rather than requiring multiple base stations for geometric triangulation.
2Measurement precision
If GPS satellite signals are used to precisely triangulate WCD location, then location granularity is improved, but the system becomes non-functional when GPS signals are unavailable
Solution Approach 1:
The patent introduces RF signatures as an intermediary measurement mechanism between the WCD and location determination. Instead of directly relying on GPS satellite signals or geometric triangulation, the system uses RF signature fingerprinting as a mediator that can operate independently of GPS infrastructure, providing location information through characteristic analysis of the radio frequency environment.
3Adaptability or versatility
If the full coverage area of a single base station is used as the best general determination of WCD location, then service availability is improved, but location precision deteriorates to the entire coverage area
Solution Approach 1:
The patent applies local quality by creating location-specific RF signature profiles for different regions within the base station's coverage area. Instead of treating the entire coverage area as a single location zone, the system divides the coverage area into multiple local regions, each with distinct RF characteristics, thereby providing precise location identification within the broader coverage area.
Data Source
AI summary
A computing system includes or has access to data records that associate (i) radio frequency (RF) signatures of device coverage from a base station with (ii) locations of devices corresponding with the RF signatures. When a device whose location is at issue is then within coverage of that base station, the computing system receives an RF signature of the device's coverage from the base station, and the computing system (i) finds multiple data records whose RF signatures of coverage from the base station most closely match the received RF signature, (ii) based on the device locations in the multiple data records, determines a representative bearing from the base station and a representative distance from the base station, and (iii) estimates the device's location to have the determined representative bearing and determined representative distance. The estimated device's location may then be used as a basis to provide a location-based service.