A method of transmitting a hybrid automatic repeat request-acknowledgement, HARQ-ACK, by a user equipment, UE, in a 3GPP wireless communication system, comprising: receiving a physical downlink control channel, PDCCH, having a counter downlink assignment index, counter-DAI, and DAI group indication information within a subframe, SF, #n-k; configuring a HARQ-ACK payload using the counter-DAI and the DAI group indication information; and transmitting the HARQ-ACK payload in an SF #n, wherein the value of the counter-DAI indicates a scheduling order value in a cell/SF unit associated with a first PDCCH in the SF #n-k, a scheduling order value in a cell/SF unit is counted in a cell first manner in a cell/SF domain, and wherein the DAI group indication information indicates whether the PDCCH corresponds to a last scheduled DAI group, wherein the DAI group is a DAI state sequence including DAI states consecutive on a counter only once, K:{k 0 ,k 1 ,...k M-1 } is given as below in each cell, TDD UL-DL Configuration Subframe n 0 1 2 3 4 5 6 7 8 9 0 - - 6 - 4 - - 6 - 4 1 - - 7, 6 4 - - - 7, 6 4 - 2 - - 8, 7, 4, 6 - - - - 8, 7, 4, 6 - - 3 - - 7, 6, 11 6, 5 5, 4 - - - - - 4 - - 12, 8, 7, 11 6, 5, 4, 7 - - - - - - 5 - - 13, 12, 9, 8, 7, 5, 4, 11, 6 - - - - - - - 6 - - 7 7 5 - - 7 7 - and the PDCCH that schedules a PDSCH transmission or a semi-persistent scheduling, SPS, release is present in a subframe #n-k, wherein the HARQ-ACK payload size is determined based on the DAI group indication information, wherein the HARQ-ACK payload includes actual HARQ-ACK bits corresponding to counter-DAIs and remaining dummy bits added in order to fill the determined HARQ-ACK payload size, wherein, when the HARQ-ACK is transmitted on the physical uplink control channel, PUCCH, transmission power of the PUCCH is determined considering only the actual HARQ-ACK bits and not the dummy bits. receiving a physical downlink control channel, PDCCH, having a counter downlink assignment index, counter-DAI, and DAI group indication information within a subframe, SF, #n-k; configuring a HARQ-ACK payload using the counter-DAI and the DAI group indication information; and transmitting the HARQ-ACK payload in an SF #n, wherein the value of the counter-DAI indicates a scheduling order value in a cell/SF unit associated with a first PDCCH in the SF #n-k, a scheduling order value in a cell/SF unit is counted in a cell first manner in a cell/SF domain, and wherein the DAI group indication information indicates whether the PDCCH corresponds to a last scheduled DAI group, wherein the DAI group is a DAI state sequence including DAI states consecutive on a counter only once, K:{k 0 ,k 1 ,...k M-1 } is given as below in each cell, TDD UL-DL Configuration Subframe n 0 1 2 3 4 5 6 7 8 9 0 - - 6 - 4 - - 6 - 4 1 - - 7, 6 4 - - - 7, 6 4 - 2 - - 8, 7, 4, 6 - - - - 8, 7, 4, 6 - - 3 - - 7, 6, 11 6, 5 5, 4 - - - - - 4 - - 12, 8, 7, 11 6, 5, 4, 7 - - - - - - 5 - - 13, 12, 9, 8, 7, 5, 4, 11, 6 - - - - - - - 6 - - 7 7 5 - - 7 7 - and the PDCCH that schedules a PDSCH transmission or a semi-persistent scheduling, SPS, release is present in a subframe #n-k, wherein the HARQ-ACK payload size is determined based on the DAI group indication information, wherein the HARQ-ACK payload includes actual HARQ-ACK bits corresponding to counter-DAIs and remaining dummy bits added in order to fill the determined HARQ-ACK payload size, wherein, when the HARQ-ACK is transmitted on the physical uplink control channel, PUCCH, transmission power of the PUCCH is determined considering only the actual HARQ-ACK bits and not the dummy bits. <EOS>