20-02-2014 дата публикации
Номер: US20140051364A1
Принадлежит:
In accordance with various example embodiments, a vehicle base station wirelessly communicates data with a remote transceiver circuit. The remote transceiver circuit intermittently transitions a data-receiving circuit of the remote transceiver circuit between on and off states. The vehicle base station intermittently polls the remote transceiver circuit with a series of data packets, at least one of which the data-receiving circuit of the remote transceiver circuit will receive while in the on state. The remote transceiver circuit, upon receiving the data packet, will reset a state counter to enable the remote transceiver circuit to receive a wake-up data packet while operating in the on state; in response, transmitting response data to the vehicle base station. The data communication is carried out to facilitate authentication of the remote transceiver. Exemplary embodiments include a system for passive keyless go and passive keyless entry in a vehicle. 1. An apparatus comprising: [{'sub': G', 'i, 'transmit radio frequency signals including a number (N) of at least three data packets with a time gap (T) between each data packet, each data packet having a first length in time (T) and including data that is common to all three data packets,'}, 'after transmitting the at least three data packets, transmit a radio frequency signal including a wake-up data packet; and, 'a vehicle base station configured and arranged to'} [{'sub': ON', 'ON', 'G', '1', 'OFF', 'OFF', '1', 'G, '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) in which T≧T+2T, and each off state having a length in time (T) in which T<(N−2) *T+(N−1)*T, and'}, [{'sub': 'ON', 'operate in the on state for at least a period T, and'}, 'in response to receiving the wake-up data packet while operating in the on state, transmitting response data to the vehicle base station., 'in response to ...
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