INTER-VEHICLE COMMUNICATION DEVICE, INTER-VEHICLE COMMUNICATION SYSTEM, AND INTER-VEHICLE COMMUNICATION METHOD

摘要

To efficiently implement time-division multiplexing channel access under coexistence of inter-vehicle communication devices using similar frequency bands and direct mobile communication terminals.SOLUTION: An inter-vehicle communication device includes: a mobile communication unit that transmits and receives radio waves of direct communication of mobile communication; a threshold value storage unit that stores a threshold value for determining whether a predetermined control channel of inter-vehicle communication is an idle channel; a level detector that outputs a predetermined detection signal if radio wave intensity of the predetermined control channel is larger than the threshold value; and a timer unit that starts timing according to the detection signal output by the level detector and transmits a timer expiration signal to the level detector when timing of a predetermined time is expired. When the level detector receives the timer expiration signal, if the radio wave intensity of the predetermined control channel does not exceed the threshold value, the mobile communication unit transmits radio waves of direct communication of mobile communication.SELECTED DRAWING: Figure 1