RF Geolocation Validation Using GPS Reference Data
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Solution Overview
Problem
Existing methods for geolocating wireless communication units in cellular networks face challenges due to reliance on unreliable consumer-grade device data and outdated network configuration, which can result in inaccurate location estimates, and require additional hardware or GPS functionality.
Innovation Solution
A method that calculates RF measurement-based geolocation estimates using signal strength, link quality, and propagation delay data, while obtaining geographical area data from third-party databases to determine a geolocation validation area and derive a confidence factor for the accuracy of the estimates, allowing for refined validation and potential replacement estimates if accuracy thresholds are not met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated hardware is installed at each base station site for geolocation, then geolocation accuracy is improved, but implementation cost increases
Solution Approach 1:
The patent uses GPS receiver data from mobile devices as a reference copy to validate RF measurement-based geolocation estimates. Instead of installing dedicated geolocation hardware at every base station, the system copies location information from independent GPS measurements to verify and correct the accuracy of RF-based location estimates.
Solution Approach 2:
The patent introduces GPS-based location data as an intermediary validation mechanism. Rather than directly relying on potentially inaccurate RF measurements or installing expensive dedicated hardware, the system uses GPS data from mobile devices as an intermediary reference point to assess and improve the reliability of geolocation estimates.
2Measurement precision
If GPS functionality is used in wireless communication units for geolocation, then geolocation accuracy is improved, but device requirements and power consumption increase
Solution Approach 1:
The patent leverages the mobile device's own GPS receiver to provide validation data for geolocation. The device uses its built-in GPS capability to independently determine its location, which then serves as a reference to validate the network-based RF measurement geolocation estimates, eliminating the need for additional dedicated geolocation hardware in the device.
Solution Approach 2:
The patent makes the GPS receiver serve multiple functions: its primary navigation function plus an additional function of providing validation data for network geolocation systems. This multi-functional use of the GPS receiver maximizes the value extracted from existing device capabilities without adding specialized geolocation hardware.
3Device complexity
If consumer-grade wireless communication unit data is used for geolocation, then device complexity is reduced, but measurement reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where GPS-based location data from mobile devices is used to validate and provide feedback on the accuracy of RF measurement-based geolocation estimates. This feedback loop allows the system to identify and correct unreliable measurements from consumer-grade devices without requiring changes to the devices themselves.
Solution Approach 2:
The patent uses GPS data from multiple mobile devices in the area to provide excessive validation coverage. Rather than relying on a single measurement, the system collects GPS data from multiple devices and uses this excess information to robustly validate and correct RF-based geolocation estimates, compensating for the limitations of consumer-grade measurement devices.
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AI summary
A method for geolocating a wireless communication unit. The method comprises receiving measurement data for radio frequency (RF) signals between the wireless communication unit and at least one base transceiver station (310), calculating an RF measurement based geolocation estimate for the wireless communication unit based at least partly on the received RF signal measurement data (315), obtaining geographical area data for at least one wireless coverage area visible to the wireless communication unit (320), determining a geolocation validation area based at least partly on the obtained geographical area data for the at least one wireless coverage area visible to the wireless communication unit (325), and deriving a confidence factor for the RF measurement based geolocation estimate based at least partly on the determined geolocation validation area (335).