Use of RF signatures to detect moved wireless transmitters
First Claim
1. A method for identifying, using a mobile device, that a wireless transmitter has been moved, the method comprising:
- measuring, at the mobile device, signals from a plurality of wireless transmitters proximate to the mobile device;
identifying, at the mobile device, a candidate wireless transmitter from the plurality of wireless transmitters, wherein identifying the candidate wireless transmitter comprises determining whether a wireless transmitter of the plurality of wireless transmitters is a mobile wireless access point by determining whether the wireless transmitter has moved more than a predetermined number of times over a predetermined period of time, and identifying the wireless transmitter as the candidate wireless transmitter responsive to the wireless transmitter not being a mobile wireless access point;
obtaining, at the mobile device, a reference radio frequency (RF) signature associated with the candidate wireless transmitter, the reference RF signature comprising location-independent information associated with the candidate wireless transmitter;
deriving, at the mobile device, an observed radio frequency (RF) signature for the candidate wireless transmitter from the measured signals of at least one wireless transmitter of the plurality of wireless transmitters other than the candidate wireless transmitter;
determining, at the mobile device, whether the candidate wireless transmitter has been moved to a new location by comparing the observed RF signature for the candidate wireless transmitter to the reference RF signature associated with the candidate wireless transmitter; and
generating, at the mobile device, an indicator indicative of whether the candidate wireless transmitter has been moved.
1 Assignment
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Accused Products
Abstract
Location-independent approaches are provided for determining, using a mobile device, whether a wireless transmitter has been moved to a new location. An example method includes obtaining at least a portion of a reference radio frequency (RF) signature database; measuring signals from a plurality of wireless transmitters proximate to the mobile device; identifying a candidate wireless transmitter; deriving an observed radio frequency (RF) signature for the candidate wireless transmitter from signals from at least one wireless transmitter of the plurality of wireless transmitters other than the candidate wireless transmitter; determining whether the candidate wireless transmitter has been moved to a new location by comparing the observed RF signature for the candidate wireless transmitter to a reference RF signature associated with the candidate wireless transmitter; and generating an indicator that the candidate wireless transmitter has been moved responsive to the candidate wireless transmitter having been moved.
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Citations
30 Claims
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1. A method for identifying, using a mobile device, that a wireless transmitter has been moved, the method comprising:
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measuring, at the mobile device, signals from a plurality of wireless transmitters proximate to the mobile device; identifying, at the mobile device, a candidate wireless transmitter from the plurality of wireless transmitters, wherein identifying the candidate wireless transmitter comprises determining whether a wireless transmitter of the plurality of wireless transmitters is a mobile wireless access point by determining whether the wireless transmitter has moved more than a predetermined number of times over a predetermined period of time, and identifying the wireless transmitter as the candidate wireless transmitter responsive to the wireless transmitter not being a mobile wireless access point; obtaining, at the mobile device, a reference radio frequency (RF) signature associated with the candidate wireless transmitter, the reference RF signature comprising location-independent information associated with the candidate wireless transmitter; deriving, at the mobile device, an observed radio frequency (RF) signature for the candidate wireless transmitter from the measured signals of at least one wireless transmitter of the plurality of wireless transmitters other than the candidate wireless transmitter; determining, at the mobile device, whether the candidate wireless transmitter has been moved to a new location by comparing the observed RF signature for the candidate wireless transmitter to the reference RF signature associated with the candidate wireless transmitter; and generating, at the mobile device, an indicator indicative of whether the candidate wireless transmitter has been moved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for identifying, using a mobile device, that a wireless transmitter has been moved, the apparatus comprising a memory and a processor, the apparatus further comprising:
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means for measuring signals, at the mobile device, from a plurality of wireless transmitters proximate to the mobile device; means for identifying, at the mobile device, a candidate wireless transmitter from the plurality of wireless transmitters, wherein the means for identifying the candidate wireless transmitter comprises means for determining whether a wireless transmitter of the plurality of wireless transmitters is a mobile wireless access point by determining whether the wireless transmitter has moved more than a predetermined number of times over a predetermined period of time and means for identifying the wireless transmitter as the candidate wireless transmitter responsive to the wireless transmitter not being a mobile wireless access point; means for obtaining, at the mobile device, a reference radio frequency (RF) signature associated with the candidate wireless transmitter, the reference RF signature comprising location-independent information associated with the candidate wireless transmitter; means for deriving, at the mobile device, an observed radio frequency (RF) signature for the candidate wireless transmitter from the measured signals of at least one wireless transmitter of the plurality of wireless transmitters other than the candidate wireless transmitter; means for determining, at the mobile device, whether the candidate wireless transmitter has been moved to a new location by comparing the observed RF signature for the candidate wireless transmitter to the reference RF signature associated with the candidate wireless transmitter; and means for generating, at the mobile device, an indicator indicative of whether the candidate wireless transmitter has been moved. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A mobile device for identifying that a wireless transmitter has been moved, the mobile device comprising:
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a tangible, non-transitory computer-readable memory; a plurality of modules comprising processor executable code stored in the memory; a processor connected to the memory and configured to access the plurality of modules stored in the memory; and a radio frequency (RF) signature module configured to measure signals from a plurality of wireless transmitters proximate to the mobile device; identify a candidate wireless transmitter from the plurality of wireless transmitters, wherein the RF signature module is configured to determine whether a wireless transmitter of the plurality of wireless transmitters is a mobile wireless access point by determining whether the wireless transmitter has moved more than a predetermined number of times over a predetermined period of time, and identify the wireless transmitter as the candidate wireless transmitter responsive to the wireless transmitter not being a mobile wireless access point; obtain a reference radio frequency (RF) signature associated with the candidate wireless transmitter, the reference RF signature comprising location-independent information associated with the candidate wireless transmitter; derive an observed radio frequency (RF) signature for the candidate wireless transmitter from the measured signals of at least one wireless transmitter of the plurality of wireless transmitters other than the candidate wireless transmitter; determine whether the candidate wireless transmitter has been moved to a new location by comparing the observed RF signature for the candidate wireless transmitter to the reference RF signature associated with the candidate wireless transmitter; and generate an indicator indicative of whether the candidate wireless transmitter. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A non-transitory computer-readable medium, having stored thereon computer-readable instructions for identifying, using a mobile device, that a wireless transmitter has been moved, comprising instructions configured to cause at least one processor to:
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measure, at the mobile device, signals from a plurality of wireless transmitters proximate to the mobile device; identify, at the mobile device, a candidate wireless transmitter from the plurality of wireless transmitters, wherein the instructions configured to cause the computer to identify the candidate wireless transmitter comprise instructions configured to cause the computer to determine whether a wireless transmitter of the plurality of wireless transmitters is a mobile wireless access point by determining whether the wireless transmitter has moved more than a predetermined number of times over a predetermined period of time, and to identify the wireless transmitter as the candidate wireless transmitter responsive to the wireless transmitter not being a mobile wireless access point; obtain, at the mobile device, a reference radio frequency (RF) signature associated with the candidate wireless transmitter, the reference RF signature comprising location-independent information associated with the candidate wireless transmitter; derive, at the mobile device, an observed radio frequency (RF) signature for the candidate wireless transmitter from the measured signals of at least one wireless transmitter of the plurality of wireless transmitters other than the candidate wireless transmitter; determine, at the mobile device, whether the candidate wireless transmitter has been moved to a new location by comparing the observed RF signature for the candidate wireless transmitter to the reference RF signature associated with the candidate wireless transmitter; and generate, at the mobile device, an indicator indicative of whether the candidate wireless transmitter has been moved. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification