Radio communication relay station apparatus, radio communication base station apparatus, radio communication system and radio communication method

Resources with efficient use, suppress the complexity of the data delay and system radio communication relay station apparatus, radio communication base station apparatus, provides a wireless communication system and a wireless communication method. When the terminal initiates a base station uplink communication via a repeater, in ST 403, the base station allocates simultaneously by Grant1 a retransmission resource and initial transmission resource to the terminal. In ST 404, the repeater successfully receives UL data transmitted from the terminal, in ST 406, the repeater using the retransmission resources allocated to the terminal, and relays the UL data transmitted from the terminal to the base station.