US Patent 10002532 Communication device and method

According to an embodiment, a communication device is provided in a movable body and is wirelessly communicable with a transceiver unit and another movable body. The communication device includes a transmitter, a receiver, a synchronization unit, a registration unit, and a stop control unit. The transmitter transmits movable body information on the movable body to a predetermined channel. The receiver receives transceiver unit information that the transceiver unit has transmitted to the predetermined channel. The synchronization unit performs synchronization of reception timing when the transceiver unit information can be received. The registration unit registers a communication area of the transceiver unit calculated based on a position where the other movable body receives the transceiver unit information in storage. The stop control unit stops transmission of the movable body information at a reception timing of the transceiver unit information, when a position of the movable body is within the registered communication area.