Patent ID: 9485266
Filing Date: 2016-11-01
CPC Classification: G07C,H04B,H04L,H04W

Claim Text:
1. A system, comprising: a radio frequency (RF) sensor configured to detect RF signals; at least one memory that stores computer-executable instructions; and an RF controller operationally coupled to a transceiver and the at least one memory, wherein the RF controller is configured to access the at least one memory and execute the computer-executable instructions to: receive an RF fingerprint of an RF signal detected by the RF sensor within an area under surveillance (AUS), the RF fingerprint comprising at least one of: i) a hardware address of an electronic device that emitted the RF signal or ii) a radio type identifier of a radio of the electronic device; identify a first receive signal strength indicator (RSSI) value of the RF signal at the RF sensor at a first time; identify a second RSSI value of the RF signal at the RF sensor at a second time; determine a velocity of the electronic device based at least in part on the first RSSI value, the second RSSI value, and a span of time between the first time and the second time; determine that the velocity is greater than a threshold velocity value; determine, based at least in part on the first RSSI value and the second RSSI value, a direction of movement of the first electronic device toward an egress point of the AUS; and generate an alarm indicating that the velocity of the electronic device toward the egress point has been detected greater than the threshold velocity value.