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 a transmission of the ACK/NACK information; and transmitting the ACK/NACK information for downlink transmission in a downlink subframe set including M downlink subframes in one uplink subframe, where M>1, wherein a plurality of serving cells are configured for the UE and include one Primary Cell, PCell, and at least one Secondary Cell, SCell, wherein the UE transmits the ACK/NACK information by channel selection using a PUCCH format 1b when at least one condition of specific conditions is met, and the UE transmits the ACK/NACK information using the PUCCH format 3 when the specific conditions are not met, characterised in that the specific conditions comprise: a first condition comprises a condition where the ACK/NACK information corresponds to one Physical Downlink Shared Channel, PDSCH, without a corresponding Physical Downlink Control Channel, PDCCH, received only on the PCell in the downlink subframe set and the ACK/NACK information further corresponds to an additional PDSCH indicated by detection of one corresponding PDCCH having a Downlink Assignment Index, DAI, value of 1, a second condition comprises a condition where the ACK/NACK information corresponds to the one PDSCH without the corresponding PDCCH received only on the PCell in the downlink subframe set and the ACK/NACK information further corresponds to an additional Semi-Persistent Scheduling, SPS, release PDCCH having a DAI value of 1. being configured to use a Physical Uplink Control Channel, PUCCH, format 3 for a transmission of the ACK/NACK information; and transmitting the ACK/NACK information for downlink transmission in a downlink subframe set including M downlink subframes in one uplink subframe, where M>1, wherein a plurality of serving cells are configured for the UE and include one Primary Cell, PCell, and at least one Secondary Cell, SCell, wherein the UE transmits the ACK/NACK information by channel selection using a PUCCH format 1b when at least one condition of specific conditions is met, and the UE transmits the ACK/NACK information using the PUCCH format 3 when the specific conditions are not met, characterised in that the specific conditions comprise: a first condition comprises a condition where the ACK/NACK information corresponds to one Physical Downlink Shared Channel, PDSCH, without a corresponding Physical Downlink Control Channel, PDCCH, received only on the PCell in the downlink subframe set and the ACK/NACK information further corresponds to an additional PDSCH indicated by detection of one corresponding PDCCH having a Downlink Assignment Index, DAI, value of 1, a second condition comprises a condition where the ACK/NACK information corresponds to the one PDSCH without the corresponding PDCCH received only on the PCell in the downlink subframe set and the ACK/NACK information further corresponds to an additional Semi-Persistent Scheduling, SPS, release PDCCH having a DAI value of 1. a first condition comprises a condition where the ACK/NACK information corresponds to one Physical Downlink Shared Channel, PDSCH, without a corresponding Physical Downlink Control Channel, PDCCH, received only on the PCell in the downlink subframe set and the ACK/NACK information further corresponds to an additional PDSCH indicated by detection of one corresponding PDCCH having a Downlink Assignment Index, DAI, value of 1, a second condition comprises a condition where the ACK/NACK information corresponds to the one PDSCH without the corresponding PDCCH received only on the PCell in the downlink subframe set and the ACK/NACK information further corresponds to an additional Semi-Persistent Scheduling, SPS, release PDCCH having a DAI value of 1.