A method for transmitting Acknowledgement/Negative Acknowledgement, ACK/NACK, information at a User Equipment, UE, in a Long Term Evolution, LTE, Time Division Duplex, TDD, wireless communication system, the method comprising: being configured to use a Physical Uplink Control Channel, PUCCH, format 3 for transmission of ACK/NACK information; and transmitting ACK/NACK information for downlink transmission in a downlink frame set including M downlink subframes, where M≥1, in one uplink subframe; and wherein more than one serving cell is configured for the UE and the more than one serving cell includes one Primary Cell, PCell, and at least one Secondary Cell, SCell, wherein the ACK/NACK information is transmitted by using a PUCCH format 1a/1b, when at least one of specific conditions is met, and the ACK/NACK information is transmitted by using the PUCCH format 3, when the specific conditions are not met, wherein the specific conditions comprise: a first condition where only one Physical Downlink Shared Channel, PDSCH, indicated by detection of a corresponding PDCCH with a Downlink Assignment Index, DAI, value of 1 is present in the downlink subframe set when receiving only on the PCell, a second condition where only one Semi-Persistent Scheduling, SPS, release PDCCH with the DAI value of 1 is present in the downlink subframe set when receiving only on the PCell, and a third condition where an SPS release PDCCH is not present in the downlink subframe set, and only one PDSCH in which the corresponding PDCCH is not detected is present in the downlink subframe set when receiving only on the PCell. being configured to use a Physical Uplink Control Channel, PUCCH, format 3 for transmission of ACK/NACK information; and transmitting ACK/NACK information for downlink transmission in a downlink frame set including M downlink subframes, where M≥1, in one uplink subframe; and wherein more than one serving cell is configured for the UE and the more than one serving cell includes one Primary Cell, PCell, and at least one Secondary Cell, SCell, wherein the ACK/NACK information is transmitted by using a PUCCH format 1a/1b, when at least one of specific conditions is met, and the ACK/NACK information is transmitted by using the PUCCH format 3, when the specific conditions are not met, wherein the specific conditions comprise: a first condition where only one Physical Downlink Shared Channel, PDSCH, indicated by detection of a corresponding PDCCH with a Downlink Assignment Index, DAI, value of 1 is present in the downlink subframe set when receiving only on the PCell, a second condition where only one Semi-Persistent Scheduling, SPS, release PDCCH with the DAI value of 1 is present in the downlink subframe set when receiving only on the PCell, and a third condition where an SPS release PDCCH is not present in the downlink subframe set, and only one PDSCH in which the corresponding PDCCH is not detected is present in the downlink subframe set when receiving only on the PCell. a first condition where only one Physical Downlink Shared Channel, PDSCH, indicated by detection of a corresponding PDCCH with a Downlink Assignment Index, DAI, value of 1 is present in the downlink subframe set when receiving only on the PCell, a second condition where only one Semi-Persistent Scheduling, SPS, release PDCCH with the DAI value of 1 is present in the downlink subframe set when receiving only on the PCell, and a third condition where an SPS release PDCCH is not present in the downlink subframe set, and only one PDSCH in which the corresponding PDCCH is not detected is present in the downlink subframe set when receiving only on the PCell. <EOS>