Communication device mounting position determination system and determination apparatus

A communication device mounting position determination system comprising a communication device provided in each of wheels of a vehicle and a determination apparatus, provided in a vehicle body of the vehicle, including a determination unit that exchanges wireless signals with the communication devices and determines which of the vehicle wheels is provided with the communication device from which the wireless signal has been received,

• wherein the determination apparatus includes:
• a vehicle body-side transmission unit that transmits a first wireless signal in a first frequency band to the communication devices;
• a vehicle body-side receiving unit that receives a second wireless signal in a second frequency band transmitted by the communication devices;
• and
• a vehicle body-side signal strength detection unit that detects a signal strength of the second wireless signal received by the receiving unit,
• wherein each of the communication devices includes:
• a wheel-side receiving unit that receives the first wireless signal transmitted by the determination apparatus;
• a wheel-side signal strength detection unit that detects a signal strength of the first wireless signal received by the receiving unit;
• and
• a wheel-side transmission unit that transmits, in the second wireless signal, information including the signal strength detected by the signal strength detection unit, and
• wherein the determination unit determines which wheel is provided with the communication device from which the vehicle body-side receiving unit has received the second wireless signal on the basis of the signal strength of the second wireless signal detected by the vehicle body-side signal strength detection unit and the signal strength included in the second wireless signal received by the vehicle body-side receiving unit.