Mobile geolocation
First Claim
1. A method comprising:
- obtaining, by a device, a signature associated with a mobile communication unit,the signature including identification information of the mobile communication unit, non-radio frequency control information, and a first timestamp,the signature not including location information,identifying, by the device, a first reference signature in a reference signature database based on the identification information,the first reference signature including first location information, a second timestamp indicating a time before the first timestamp, and radio frequency information,identifying, by the device, a second reference signature in the reference signature database based on the identification information,the second reference signature including second location information, a third timestamp indicating a time after the first timestamp, and radio frequency information,interpolating, by the device, the first location information from the first reference signature and the second location information from the second reference signature to provide a location estimate associated with the signature,creating, by the device, a third reference signature by combining information identifying the location estimate and at least a part of the signature,the third reference signature being for use in geolocation in a wireless communication system.
3 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for generating reference signatures for use in geolocation in a cellular wireless communication system is provided. A first signature for a mobile communication unit comprises location information, a timestamp, and radio frequency measurement information obtained by a mobile communication unit at a location, but does not contain identification information for the mobile communication unit. The first signature is compared to signatures in a database, to identify a second signature that has a timestamp and radio frequency measurement information that correspond to those of the first signature. A reference signature is created by combining at least a part of the first signature with at least a part of the second signature. Repetition of the comparison and combination steps creates a database of reference signatures, for use in geolocating other received call signatures.
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Citations
20 Claims
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1. A method comprising:
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obtaining, by a device, a signature associated with a mobile communication unit, the signature including identification information of the mobile communication unit, non-radio frequency control information, and a first timestamp, the signature not including location information, identifying, by the device, a first reference signature in a reference signature database based on the identification information, the first reference signature including first location information, a second timestamp indicating a time before the first timestamp, and radio frequency information, identifying, by the device, a second reference signature in the reference signature database based on the identification information, the second reference signature including second location information, a third timestamp indicating a time after the first timestamp, and radio frequency information, interpolating, by the device, the first location information from the first reference signature and the second location information from the second reference signature to provide a location estimate associated with the signature, creating, by the device, a third reference signature by combining information identifying the location estimate and at least a part of the signature, the third reference signature being for use in geolocation in a wireless communication system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device comprising:
one or more processors to; obtain a signature associated with a mobile communication unit, the signature including identification information of the mobile communication unit, non-radio frequency control information, and a first timestamp, the signature not including location information, identify a first reference signature in a reference signature database based on the identification information, the first reference signature including first location information, a second timestamp indicating a time before the first timestamp, and radio frequency information, identify a second reference signature in the reference signature database based on the identification information, the second reference signature including second location information, a third timestamp indicating a time after the first timestamp, and radio frequency information, interpolate or extrapolate at least one of the first location information from the first reference signature or the second location information from the second reference signature to provide a location estimate associated with the signature, create a third reference signature by combining information identifying the location estimate and at least a part of the signature, the third reference signature being for use in geolocation in a wireless communication system. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer-readable medium storing instructions, the instructions comprising:
one or more instructions that, when executed by a device, cause the device to; obtain a signature associated with a mobile communication unit, the signature including identification information of the mobile communication unit, non-radio frequency control information, and a first timestamp, the signature not including location information, identify a reference signature in a reference signature database based on the identification information, the reference signature including first location information, a second timestamp indicating a time before or after the first timestamp, and radio frequency information, extrapolate, by the device, the first location information from the reference signature to provide a location estimate associated with the signature, create, by the device, a second reference signature by combining information identifying the location estimate and at least a part of the signature, the second reference signature being for use in geolocation in a wireless communication system. - View Dependent Claims (16, 17, 18, 19, 20)
Specification