Patent ID: 8532576
Filing Date: 2013-09-10
Classification: B60R,G07C

Abstract:
1. A portable device for performing wireless communication with a communication controller to receive a first request signal from the communication controller, the portable device comprising: a transmitter which transmits a first response signal with a selected one of a plurality of transmission radio frequencies that corresponds to the first request signal in response thereto; and a transmission control unit which controls a transmission radio frequency of the transmitter and transmits the first response signal from the transmitter with one of the plurality of transmission radio frequencies, with the portable device being able to receive a second request signal from the communication controller that receives the first response signal; wherein when the portable device does not receive the second request signal, the transmission control unit retransmits the first response signal from the transmitter with another one of the plurality of transmission radio frequencies without waiting for retransmission of the first request signal from the communication controller.