A user terminal configured to communicate with a plurality of cells, the user terminal comprising: a receiving section configured to receive multiple downlink control information including a counter Downlink Assignment Indicator, DAI, from the plurality of cells; and a transmission section configured to transmit a delivery acknowledgement signal for a downlink shared data channel received from each of the plurality of cells based on the counter DAI, wherein the plurality of cells include first cells (CC#1 - CC#4) and second cells (CC#5 - CC#9), the first cells including first count cells at a first time index (#n), and the second cells including second count cells at a second time index (#m+4) and third count cells at a third time index (#m+5) subsequent to the second time index (#m+4), the first time index (#n) being located prior to the second time index (#m+4), wherein continuous counter DAI is configured for the first count cells, the second count cells and the third count cells, the first cells (CC#1 - CC#4) are configured with a first-time unit, and the second cells (CC#5 - CC#9) are configured with a second-time unit shorter than the first-time unit and shorter than a subframe, a value of the counter DAI is counted up from a lowest cell index of the first count cells to a maximum cell index of the first count cells, after the maximum cell index is reached, the value of the counter DAI is counted up from a lowest cell index of the second count cells at the second time index (#m+4) to a maximum cell index of the second count cells, and after the maximum cell index of the second count cells is reached, the value of the counter DAI is counted up from a lowest cell index of the third count cells at the third time index (#m+5) to a maximum cell index of the third count cells. a receiving section configured to receive multiple downlink control information including a counter Downlink Assignment Indicator, DAI, from the plurality of cells; and a transmission section configured to transmit a delivery acknowledgement signal for a downlink shared data channel received from each of the plurality of cells based on the counter DAI, wherein the plurality of cells include first cells (CC#1 - CC#4) and second cells (CC#5 - CC#9), the first cells including first count cells at a first time index (#n), and the second cells including second count cells at a second time index (#m+4) and third count cells at a third time index (#m+5) subsequent to the second time index (#m+4), the first time index (#n) being located prior to the second time index (#m+4), wherein continuous counter DAI is configured for the first count cells, the second count cells and the third count cells, the first cells (CC#1 - CC#4) are configured with a first-time unit, and the second cells (CC#5 - CC#9) are configured with a second-time unit shorter than the first-time unit and shorter than a subframe, a value of the counter DAI is counted up from a lowest cell index of the first count cells to a maximum cell index of the first count cells, after the maximum cell index is reached, the value of the counter DAI is counted up from a lowest cell index of the second count cells at the second time index (#m+4) to a maximum cell index of the second count cells, and after the maximum cell index of the second count cells is reached, the value of the counter DAI is counted up from a lowest cell index of the third count cells at the third time index (#m+5) to a maximum cell index of the third count cells. <EOS>