Mobile station apparatus and wireless communication method

Abstract

A mobile station wherein the power consumption can be suppressed. In a frame 3 , this mobile station ( 100 ) transmits, to both a base station ( 200 ) and a relay station ( 150 ), a multicarrier signal comprising a plurality of subcarriers that have been controlled in transmission power on the basis of reception quality information 1 (Processes ( 3 ) and ( 3 )′: first transmission). In a frame 4 , the mobile station ( 100 ) transmits, only to the base station ( 200 ), a multicarrier signal comprising a plurality of subcarriers that have been controlled in transmission power on the basis of reception quality information 2 (Process ( 5 ): second transmission). In this case, the mobile station ( 100 ) selects subcarriers in which reception qualities indicated by the reception quality information 2 are lower than a target quality, and the mobile station ( 100 ) then transmits, to the base station ( 200 ), a multicarrier signal comprising only those subcarriers in which the reception qualities are lower than the target quality.

1 . A transmission apparatus that transmits a signal to a reception apparatus via a relay station apparatus, the transmission apparatus comprising:
 a power controller that controls a transmission power of the signal; and   a transmitter that transmits the power controlled signal, wherein   the power controller controls a transmission power of a first signal relayed by the relay station apparatus, so as to be smaller than a transmission power of a second signal not relayed by the relay station apparatus.   
     
     
         2 . The transmission apparatus of  claim 1 , wherein,
 the power controller controls the transmission power in accordance with channel quality between the relay station apparatus and the base station apparatus, and   the transmitter transmits a signal composing all of the plurality of frequency components as the first signal and transmits a signal composing frequency components where the channel quality is below target quality as the second signal.   
     
     
         3 . The transmission apparatus of  claim 1 , wherein, the transmitter transmits the first signal in a first transmission and transmits the second signal in a second transmission. 
     
     
         4 . The transmission apparatus of  claim 1 , wherein the controller controls a transmission power of a first frequency component where channel quality is below the target quality to be greater than a transmission power of a second frequency component where channel quality is equal to or above the target quality. 
     
     
         5 . The transmission apparatus of  claim 4 , wherein the transmitter transmits a signal comprising both the first frequency component and the second frequency component. 
     
     
         6 . The transmission apparatus of  claim 1 , wherein the controller controls the transmission power of first frequency component where channel quality is below the target quality, based on the channel quality, and controls the transmission power of second frequency component where channel quality is equal to or above the target quality, based on channel quality between the transmission apparatus and the relay station apparatus. 
     
     
         7 . The transmission apparatus of  claim 6 , wherein the transmitter transmits a signal comprising both the first frequency component and the second frequency component. 
     
     
         8 . The transmission apparatus of  claim 1 , further comprising a delaying section that delays a transmission timing of a signal comprising only frequency components where channel quality is below the target quality, wherein,
 the transmitter transmits the signal comprising only the frequency components where channel quality is below the target quality later than a signal comprising only frequency components where channel quality is equal to or above the target quality.   
     
     
         9 . The transmission apparatus of  claim 8 , wherein the delaying section sets the delay of the transmission timing within a guard interval length. 
     
     
         10 . A transmission method in which a transmission apparatus transmits a signal to a reception apparatus via a relay station apparatus, the method comprising:
 controlling a transmission power of a first signal relayed by the relay station apparatus, so as to be smaller than a transmission power of a second signal not relayed by the relay station apparatus; and   transmitting the power controlled signal.   
     
     
         11 . A reception apparatus that receives a signal, comprising:
 a receiver that receives a first signal relayed by a relay station apparatus and a second signal directly transmitted by a transmission apparatus; and   a combiner that combines the first signal and the second signal, wherein   a transmission power of the first signal is smaller than a transmission power of the second signal.   
     
     
         12 . A reception method in which a reception apparatus receives a signal, the method comprising:
 receiving a first signal relayed by a relay station apparatus and a second signal directly transmitted by a transmission apparatus; and   combining the first signal and the second signal, wherein   a transmission power the first signal is smaller than a transmission power of the second signal.