Patent ID: 8903457

Claim:
An apparatus comprising: a vehicle base station configured and arranged to transmit radio frequency signals including a number (N) of a plurality of data packets with a time gap (T G ) between each data packet, each data packet having a first length in time (T 1 ) and including data that is common to all plurality of data packets, after transmitting the plurality of data packets, transmit a radio frequency signal including a wake-up data packet; and a remote transceiver circuit having a data-receiving circuit configured and arranged to receive the radio frequency signals from the vehicle base station, the remote transceiver circuit being configured and arranged to intermittently transition between on and off states in which the data-receiving circuit is respectively enabled and not enabled, each on state having a length in time (T ON ) in which T ON ≧T G +2T 1 , and each off state having a length in time (T OFF ) in which T OFF <(N−2)*T 1 +(N−1)*T G , and in response to receiving at least one of the plurality data packets via the data-receiving circuit, operate in the on state for at least a period T ON , and in response to receiving the wake-up data packet while operating in the on state, transmitting response data to the vehicle base station.