Patent ID: 8005052

Claim:
A radio resource allocation system in which a roadside equipment placed on a road allocates a radio resource to an in-vehicle equipment that exists in a given area where the in-vehicle equipment mounted on a vehicle communicates with another in-vehicle equipment by using the allocated radio resource, the radio resource allocation system comprising: the in-vehicle equipment comprising a signal transmitting unit that transmits a signal showing that the own vehicle exists in the given area, and the, roadside equipment comprising: a radio resource allocation unit that allocates a time slot as the radio resource to the in-vehicle equipment so as to permit the in-vehicle equipment to communicate with the another in-vehicle equipment when the roadside equipment receives the signal transmitted by the signal transmitting unit and notifies each in-vehicle equipment of the allocation of the time slot by a broadcast signal, the each in-vehicle equipment existing in the given area, and a radio resource release unit that releases the time slot as the radio resource when the roadside equipment does not receive the signal from the in-vehicle equipment allocated the time slot as the radio resource by the radio resource allocation unit.