Patent ID: 9408036
Filing Date: 2016-08-02
CPC Classification: H04W

Claim Text:
1. A method comprising: at a plurality of receiver devices, receiving wireless transmissions from beacon devices, wherein the wireless transmissions of the beacon devices comprise packets that carry information used for location-based services for mobile wireless devices; obtaining content of one or more fields of the packets transmitted by the beacon devices and received by one or more of the plurality of receiver devices; generating measurement data associated with the transmissions received at the plurality of receiver devices, the measurement data for use in determining locations of the beacon devices; computing locations of the respective beacon devices from the measurement data generated by the plurality of receiver devices; storing information identifying detected beacon devices and their locations to maintain a location history of beacon devices over time; determining differences between the locations of detected beacon devices stored in the location history and computed locations of the respective beacon devices based at least on the content of one or more fields of the packets transmitted by the beacon devices; and determining whether the differences are greater than a predetermined threshold.