Patent ID: 8334791

Claim:
A communication system comprising a roadside unit and a mobile communication unit that performs communication with said roadside unit by using one of a plurality of communication channels, wherein said mobile communication unit comprises: a communication condition measuring unit which, based on radio signals received from said roadside unit and other communication units, obtains for each of said plurality of communication channels a reception condition measurement representing a reception condition of the radio signal received from said roadside unit; and a channel information reporting unit which selects at least one of said plurality of communication channels as a candidate channel, and which reports candidate channel information determined based on the reception condition measurement of said candidate channel to said roadside unit, and said roadside unit comprises: a receiving channel assigning unit which, based on said candidate channel information, assigns from among said candidate channels a receiving channel that said mobile communication unit is to use to receive the radio signal from said roadside unit; and a receiving channel reporting unit which reports said receiving channel to said mobile communication unit.