A relay station comprising: a control unit configured to control a transmission processing device (38, 39, 40, 41) and a reception processing device (32, 33, 34) not to allow overlap of a first receiving period for receiving radio signals from a radio base station and a first transmitting period, following the first receiving period, for transmitting radio signals to a radio terminal under control of the relay station, characterised in that: the control unit is configured to control the transmission processing device to provide a second transmitting period to transmit radio signals to the radio base station following the first transmitting period, the control unit is configured to transmit a known signal to the radio base station, the control unit is configured to receive information notifying a starting time of the second transmitting period from the radio base station, the starting time of the second transmitting period is determined in accordance with a deviation of reception timing of the known signal at the radio base station, and the control unit is configured to determine a length of the first receiving period by subtracting a length of the first transmitting period from a period between a starting time of the first receiving period and the notified starting time of the second transmitting period. a control unit configured to control a transmission processing device (38, 39, 40, 41) and a reception processing device (32, 33, 34) not to allow overlap of a first receiving period for receiving radio signals from a radio base station and a first transmitting period, following the first receiving period, for transmitting radio signals to a radio terminal under control of the relay station, characterised in that: the control unit is configured to control the transmission processing device to provide a second transmitting period to transmit radio signals to the radio base station following the first transmitting period, the control unit is configured to transmit a known signal to the radio base station, the control unit is configured to receive information notifying a starting time of the second transmitting period from the radio base station, the starting time of the second transmitting period is determined in accordance with a deviation of reception timing of the known signal at the radio base station, and the control unit is configured to determine a length of the first receiving period by subtracting a length of the first transmitting period from a period between a starting time of the first receiving period and the notified starting time of the second transmitting period. the control unit is configured to control the transmission processing device to provide a second transmitting period to transmit radio signals to the radio base station following the first transmitting period, the control unit is configured to transmit a known signal to the radio base station, the control unit is configured to receive information notifying a starting time of the second transmitting period from the radio base station, the starting time of the second transmitting period is determined in accordance with a deviation of reception timing of the known signal at the radio base station, and the control unit is configured to determine a length of the first receiving period by subtracting a length of the first transmitting period from a period between a starting time of the first receiving period and the notified starting time of the second transmitting period.