Patent ID: 8620394

Claim:
A RF-communication device comprising: a RF transceiver to communicate over a communication network using a RF protocol and being controllable in a reduced power-consumption mode in which the RF transceiver does not communicate over the network; and a RF receiver including an envelope detector and a pulse generator circuit, the envelope detector circuit providing an envelope-based signal to a pulse generator circuit that, in response to the envelope-based signal and after generating a number of pulses that exceeds a predetermined number of pulses, prompts the RF transceiver to transition out of the reduced power-consumption mode, wherein the pulse generator circuit comprises a comparator to compare the envelop-based signal to a threshold voltage, wherein the threshold voltage is a function of a maximum distance between communicating devices in the communications network; wherein the RF receiver includes a timing circuit to record pulse timings of the generated pulses and to compare the recorded pulse timings to predetermined pulse timing for the RF-communication device.