Abstract
The invention claims in the control information of the system E-PDCCH the wireless communication terminal can avoid collision of ACK/NACK and improves the utilization efficiency of the ACK/NACK resource inhibiting the PUSCH frequency band is reduced. The structure of wireless communication terminal comprises: a receiving unit by the enhanced physical downlink control channel (E-PDCCH) from one or more configuration candidate by using any configuration transmission receiving ACK/NACK identification comprising the control signal; control unit the E-PDCCH configuration information and the ACK/NACK identification based on sending and receiving of the E-PDCCH from the specified resource selection specified in advance an ACK/NACK signal for the downlink data using resource; and a sending unit for sending the ACK/NACK signal using the designated resources selected.
A wireless communication terminal with which in a system by which Enhanced Physical Downlink Control Channel (E-PDCCH) control information is transmitted ACK/NACK resource usage efficiency can be increased and a wasteful decrease in the bandwidth of a PUSCH can be suppressed while avoiding an ACK/NACK conflict. The wireless communication terminal is provided with: a reception unit which receives a control signal including an ACK/NACK indicator via an E-PDCCH transmitted using any one configuration from one or a plurality of configuration candidates; a control unit which selects on the basis of the ACK/NACK indicator and the E-PDCCH configuration information used for the E-PDCCH transmission/reception resources used for a downlink data ACK/NACK signal from among designated resources that are designated in advance; and a transmission unit which transmits the ACK/NACK signal using the selected designated resources.
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