Patent ID: 9439168
Filing Date: 2016-09-06
CPC Classification: G01S,H04B,H04W

Claim Text:
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.