If it is not necessary to mutually distinguish particularly the relay station 100a and the relay station 100b herein in the description below, the relay station is generically called the relay station 100 by omitting the alphabet at the end of the numeral. This also applies to the mobile stations 200a, 200b and the like (mobile station 200).

An example in which the OFDMA method and the SC-FDMA method are mainly used for different purposes (or used in combination) for relay communication will herein be described. However, the present invention is not limited to such an example and it is needless to say that the present invention is also applicable to combinations of other modulation and/or multiplexing methods.

<2-1. Overall Configuration>

FIG. 5 is a block diagram showing an example of the logical configuration of the relay station 100 according to an embodiment of the present invention. Referring to FIG. 5, the relay station 100 includes a first communication unit 110, a second communication unit 150, and a communication control unit 190. The first communication unit 110 contains a receiving antenna 112, a first receiving unit 114, a first transmitting unit 152, and a transmitting antenna 154. The second communication unit 150 contains a receiving antenna 116, a second receiving unit 118, a second transmitting unit 156, and a transmitting antenna 158.