Patent ID: 7289022

Claim:
A communication system for communicating between a tire/wheel assembly and a vehicle body, comprising: a wheel-side communication device mounted on the tire/wheel assembly so as to rotate together with the tire/wheel assembly; a body-side communication device mounted in a fixed position to the vehicle body; a rotational position detecting device that detects a rotational position of the tire/wheel assembly, wherein the body-side communication device transmits a signal to the wheel-side communication device at a body-side transmission timing in accordance with the rotational position of the tire/wheel assembly; and a body-side transmission timing determining device that sets the body-side transmission timing based on a relationship between i) the rotational position detected by the rotational position detecting device and ii) a received signal level which is a level of a signal received by one of the body-side communication device and the wheel-side communication device from the other.