USER TERMINAL, WIRELESS BASE STATION, AND WIRELESS COMMUNICATION METHOD

摘要

The present invention makes it possible to perform HARQ-ACK feedback appropriately and suppress a deterioration in communication quality even when a plurality of component carriers are set in a wireless communication system. The invention has a reception unit that receives DL signals transmitted from a plurality of cells, and a control unit that controls ACK/NACK transmission in response to the received DL signals, wherein when downlink control information for the cells is received, the control unit controls ACK/NACK transmission using the cell having the highest DL allocation index value included in the received downlink control information, or an uplink control channel resource set for the cell having the highest cell index.