Radio relay station

Radio relay station provided on a moving vehicle is provided. Radio relay station receives the downlink radio signal from a fixed base station that is fixed to the outside of the vehicle, transmits a downlink radio signal from a downlink radio signal from a fixed base station to the user equipment a destination in a vehicle to. The radio relay station receives the uplink radio signal from a plurality of user devices in the vehicle, transmits an uplink radio signal to the fixed base station from the uplink radio signal from the user equipment. Radio relay station, a plurality of user devices, and receives an auxiliary radio signal indicating the downlink radio signal fixed base station transmits, in the reception result of the auxiliary signal, downlink user device addressed in a vehicle radio detecting a signal, and transmits the downlink wireless signal to the user equipment.