TERMINAL DEVICE, BASE STATION DEVICE, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT

摘要

A terminal device equipped with a transmission unit for transmitting HARQ-ACK using a first PUCCH resource and a PUCCH format (3), in response to the transmission of a PDSCH in a secondary cell accompanying a cell index having a value no greater than a first prescribed value, and transmitting HARQ-ACK by using a second PUCCH resource and a PUCCH format (4) in response to the transmission of a PDSCH in a secondary cell accompanying a cell index having a value greater than the first prescribed value, wherein the first prescribed value is the value of the fourth cell index, when arranging the values of the cell indices set by a base station device in order starting from the smallest value.