On-vehicle communication device, communication control method and vehicle

A communication control method comprising:

• storing a position of a roadside device into a roadside device position information storage in advance, the roadside device position information storage being installed in a vehicle;
• acquiring a position of the vehicle;
• determining a threshold distance based on 1) a distance that a radio wave emitted from the roadside device travels and 2) a duration for switching a state of the transmission and reception circuit from the power-saving state to the non-power-saving state;
• determining whether the vehicle approaches the roadside device based on determining that a distance between the position of the roadside device and the position of the vehicle is within the threshold distance;
• and
• switching, in response to determining that the vehicle approaches the roadside device, a state of the transmission and reception circuit from the power-saving state to the non-power-saving state to communicate with the roadside device.

A vehicle comprising:

• a communication device mounted on the vehicle, wherein the communication device comprises:
• a transmission and reception circuit that communicates with a roadside device, the transmission and reception circuit configured to switch between a power-saving state and a non-power-saving state;
• a first memory storing a position of the roadside device in advance;
• a processor;
• and
• a second memory storing a program, when executed by the processor, causes the processor to perform operations of:
• acquiring a position of the vehicle;
• determining a threshold distance based on 1) a distance that a radio wave emitted from the roadside device travels and 2) a duration for switching a state of the transmission and reception circuit from the power-saving state to the non-power-saving state;
• determining whether the vehicle approaches the roadside device based on determining that a distance between the position of the roadside device and the position of the vehicle is within the threshold distance;
• and
• switching, in response to determining that the vehicle approaches the roadside device, the state of the transmission and reception circuit from the power-saving state to the non-power-saving state to communicate with the roadside device.