Wireless communication device and wireless communication method

A wireless communication device, comprising:

• a reception section that is configured to receive a downlink signal in a first subframe from a first other wireless communication device;
• an ACK/NACK generation section that is configured to generate first ACK/NACK which indicates an error determination result of the received downlink signal;
• a determination section that is configured, when an uplink signal directed to the first other wireless communication device is not allocated in a second subframe, to determine whether a different uplink signal or second ACK/NACK for a different downlink signal is allocated in one or more fourth subframes, wherein said one or more fourth subframes are subframes subsequent to the second subframe by a determined number of subframes and previous to a third subframe subsequent to the second subframe;
• a multiplexing section that is configured to multiplex the first ACK/NACK to the different uplink signal or the second ACK/NACK for the different downlink signal in the one or more fourth subframes when the determination section determines that the different uplink signal or the second ACK/NACK for the different downlink signal is allocated in the one or more fourth subframes;
• and
• a transmission section that is configured to transmit the different uplink signal or the second ACK/NACK for the different downlink signal in which the first ACK/NACK is multiplexed by the multiplexing section.

A wireless communication method, comprising:

• receiving a downlink signal in a first subframe from a first other wireless communication device;
• generating an ACK/NACK which indicates an error determination result of the received downlink signal;
• when an uplink signal directed to the first other wireless communication device is not allocated in a second subframe, determining whether a different uplink signal is allocated in a third subframe, wherein the third subframe is a subframe subsequent to the first subframe by a determined number of subframes and previous to the second subframe;
• multiplexing the ACK/NACK to the different uplink signal in the third subframe when it is determined that the different uplink signal is allocated in the third subframe;
• and
• transmitting the different uplink signal in which the ACK/NACK is multiplexed.

A wireless communication method, comprising:

• receiving a downlink signal in a first subframe from a first other wireless communication device;
• generating first ACK/NACK which indicates an error determination result of the received downlink signal;
• when an uplink signal directed to the first other wireless communication device is not allocated in a second subframe, determining whether a different uplink signal or second ACK/NACK for a different downlink signal is allocated in a fourth subframe, wherein said forth subframe is a subframe subsequent to the second subframe by a determined number of subframes and previous to a third subframe subsequent to the second subframe;
• multiplexing the first ACK/NACK to the different uplink signal or the second ACK/NACK for the different downlink signal in the fourth subframe, when determining that the different uplink signal or the second ACK/NACK for the different downlink signal is allocated in the fourth subframe;
• and
• transmitting the different uplink signal in which the first ACK/NACK is multiplexed or the second ACK/NACK for the different downlink signal.