| 摘要 |
The purpose of the present invention is to avoid ACK/NACK collision in a system in which E-PDCCH control information is transmitted, increase the utilization efficiency of ACK/NACK resources, and suppress unnecessary PUSCH band reduction. A wireless communications terminal having a configuration comprising: a reception unit that receives control signals including ACK/NACK indexes, via an expanded physical downlink control channel; a control unit that determines, on the basis of the ACK/NACK indexes, whether to use a dynamically allocated dynamic ACK/NACK resource or a specified resource specified beforehand, to send downlink data ACK/NACK signals; and a transmission unit that sends the ACK/NACK signals using the dynamic ACK/NACK resource or the specified resource, as determined. |
| 主权项 |
1. A radio communication terminal comprising:
a receiver, which, in operation, receives, via an enhanced physical downlink control channel (E-PDCCH), a control signal including an ACK/NACK indicator, wherein the ACK/NACK indicator takes one of four possible values including a first value and a second value; and a controller, which, in operation, determines, based on the ACK/NACK indicator and an enhanced control channel element (eCCE) number of the received E-PDCCH, a resource number to transmit an ACK/NACK signal for downlink data using a dynamic ACK/NACK resource dynamically allocated in accordance with the control signal, wherein the controller, in operation, determines a first resource number as the resource number when the ACK/NACK indicator takes the first value and determines a second resource number as the resource number when the ACK/NACK indicator takes the second value, wherein a value of the difference between the first resource number and the second resource number is 1; and a transmitter, which, in operation, transmits the ACK/NACK signal using the dynamic ACK/NACK resource having the determined resource number when the ACK/NACK indicator takes the first value or the second value. |
