Radio relay station

A radio relay station arranged on a moving conveyance, comprising:

• a first radio receiver configured to receive a downlink radio signal from at least one stationary base station that is fixed outside the conveyance;
• a second radio receiver configured to receive uplink radio signals from a plurality of user equipments in the conveyance, and to receive, from more than one user equipment being at least a part of the plurality of user equipments, auxiliary signals indicating the downlink radio signal which the at least one stationary base station has transmitted;
• a first radio transmitter configured to transmit, to a destination user equipment in the conveyance, a downlink radio signal resulting from the downlink radio signal transmitted from the at least one stationary base station and received by the first radio receiver;
• a second radio transmitter configured to transmit to the at least one stationary base station uplink radio signals resulting from the uplink radio signals transmitted from the plurality of user equipments and received by the second radio receiver;
• and
• a signal detector configured to detect within a result of reception of the auxiliary signals a downlink radio signal that is addressed to a user equipment in the conveyance,
• wherein the first radio transmitter transmits the downlink radio signal, which is detected by the signal detector and is addressed to the user equipment in the conveyance, to that user equipment.