Wireless communication relay station apparatus, wireless communication base station apparatus, wireless communication mobile station

1. A radio communication relay station apparatus for relaying communication between a radio communication base station apparatus and a radio communication mobile station apparatus, the radio communication relay station apparatus comprising:

a receiver that is configured to receive data from the radio communication base station apparatus or the radio communication mobile station apparatus;

a transmitter that is configured to relay the received data to the radio communication base station apparatus or the radio communication mobile station apparatus; and

a selector that is configured to select the received data, in an uplink subframe or a downlink subframe, from: first data to be relayed from the relay station apparatus to the radio communication base station apparatus; second data to be relayed from the relay station apparatus to the radio communication mobile station apparatus; third data to be transmitted from the radio communication base station apparatus to the relay station apparatus; and fourth data to be transmitted from the radio communication mobile station apparatus to the relay station apparatus, wherein

the receiver is configured to receive allocation information for dividing the uplink subframe or the downlink subframe and switching transmission/reception between the divided uplink subframe or the divided downlink subframe in the relay station apparatus from the radio communication base station apparatus, and

the selector is configured to switch the first data and the fourth data, or the first data and the second data, between the divided uplink subframe in accordance with the allocation information received by the receiver, or

the selector is configured to switch the second data and the third data, or the fourth data and the third data, between the divided downlink subframe in accordance with the allocation information received by the receiver.

2. The radio communication relay station apparatus according to claim 1 , wherein

the receiver is configured to receive the allocation information which has been set in a unit of slot being half of the uplink subframe or the downlink subframe from the radio communication base station apparatus, and

the selector is configured to switch allocation of each data in the uplink subframe or the downlink subframe on the slot basis in accordance with the allocation information received by the receiver.

3. The radio communication relay station apparatus according to claim 1 , wherein

the receiver is configured to receive the allocation information which has been set in a unit of OFDM symbol from the radio communication base station apparatus in the uplink subframe or the downlink subframe, and

the selector is configured to switch allocation of each data in the uplink subframe or the downlink subframe on the OFDM symbol basis in accordance with the allocation information received by the receiver.

4. The radio communication relay station apparatus according to claim 1 , wherein

the transmitter transmits a downlink reference signal in a predetermined OFDM symbol in a subframe which is set to the uplink subframe in a first cell of the radio communication base station apparatus and set to the downlink subframe in a second cell of the radio communication relay station apparatus, when the selector switches the first data and the second data.

5. A radio communication base station apparatus for communicating with a radio communication mobile station apparatus via a radio communication relay station apparatus, the radio communication base station apparatus comprising:

an allocation information generator that is configured to:

determine whether an uplink subframe or a downlink subframe is to be divided or not, based on an amount of traffic of either between the base station apparatus and the radio communication relay station apparatus, between the base station apparatus and the radio communication mobile station apparatus or between the radio communication relay station apparatus and the radio communication mobile station apparatus, and

to generate allocation information for dividing the uplink subframe or the downlink subframe and switching transmission/reception between the divided uplink subframe or the divided downlink subframe in the radio communication relay station apparatus in accordance with a result of the determination; and

a transmitter that is configured to transmit data and the allocation information to the radio communication relay station apparatus.

6. The radio communication base station apparatus according to claim 5 , wherein

the allocation information generator is configured to generate the allocation information for switching transmission/reception in the radio communication relay station apparatus in the uplink subframe or the downlink subframe on a slot basis or an OFDM symbol basis, when the result of the determination is that the uplink subframe or the downlink subframe is to be divided, and

the transmitter is configured to transmit the allocation information to the radio communication relay station apparatus.

7. A radio communication mobile station apparatus for communicating with a radio communication base station apparatus via a radio communication relay station apparatus, the radio communication mobile station apparatus comprising:

a receiver that is configured to receive first data relayed from the radio communication relay station apparatus;

a transmitter that is configured to transmit second data to the radio communication relay station apparatus; and

a selector that is configured to select the first or second data, in an uplink subframe set in a first cell of the radio communication base station apparatus or a downlink subframe set in a second cell of the radio communication relay station apparatus, wherein

the receiver is configured to receive allocation information for dividing an uplink subframe or a downlink subframe and switching transmission/reception between the divided uplink subframe or the divided downlink subframe in the mobile station apparatus from the radio communication base station apparatus via the radio communication relay station apparatus, and

the selector is configured to select either of the first data or the second data in the uplink subframe in accordance with the allocation information, or

the selector is configured to select the first data in the downlink subframe in accordance with the allocation information.

8. The radio communication mobile station apparatus according to claim 7 , wherein

the receiver receives the first data and a downlink reference signal allocated in an OFDM symbol which is not included in the first data, when the selector selects the first data in the downlink subframe and a data length of the first data is shorter than a length of one subframe.

9. A radio communication method in a radio communication relay station apparatus for relaying communication between a radio communication base station apparatus and a radio communication mobile station apparatus, the radio communication method comprising:

receiving data from the radio communication base station apparatus or the radio communication mobile station apparatus;

selecting received data in an uplink subframe or a downlink subframe, from: first data to be relayed from the radio communication relay station apparatus to the radio communication base station apparatus; second data to be relayed from the radio communication relay station apparatus to the radio communication mobile station apparatus; third data to be transmitted from the radio communication base station apparatus to the radio communication relay station apparatus; and fourth data to be transmitted from the radio communication mobile station apparatus to the radio communication relay station apparatus;

receiving allocation information for dividing the uplink subframe or the downlink subframe and switching transmission/reception between the divided uplink subframe or the divided downlink subframe in the radio communication relay station apparatus from the radio communication base station apparatus; and

switching the first data and the fourth data, or the first data and the second data, between the divided uplink subframe in accordance with the received allocation information, or

switching the second data and the third data, or the fourth data and the third data, between the divided downlink subframe in accordance with the received allocation information.

10. A radio communication method in a radio communication base station apparatus for communicating with a radio communication mobile station apparatus via a radio communication relay station apparatus, the radio communication method comprising:

determining whether an uplink subframe or a downlink subframe is to be divided based on an amount of traffic between the radio communication base station apparatus and the radio communication relay station apparatus, between the radio communication base station apparatus and the radio communication mobile station apparatus, or between the radio communication relay station apparatus and the radio communication mobile station apparatus;

generating allocation information for dividing the uplink subframe or the downlink subframe and switching transmission/reception between the divided uplink subframe or the divided downlink subframe in the radio communication relay station apparatus in accordance with a result of the determination; and

transmitting the allocation information to the radio communication relay station apparatus.

11. A radio communication method in a radio communication mobile station apparatus for communicating with a radio communication base station apparatus via a radio communication relay station apparatus, the radio communication method comprising:

receiving allocation information for dividing an uplink subframe or a downlink subframe and switching transmission/reception between the divided uplink subframe or the divided downlink subframe in the radio communication mobile station apparatus from the radio communication base station apparatus via the radio communication relay station apparatus;

selecting any one data, in a subframe which is set to an uplink subframe in a first cell of the radio communication base station apparatus, from first data to be relayed from the radio communication relay station apparatus to the radio communication mobile station apparatus and second data to be transmitted from the radio communication mobile station apparatus to the radio communication relay station apparatus; and

selecting the first data among the first and second data, in a subframe which is set to a downlink subframe in a second cell of the radio communication relay station apparatus.