Method and apparatus for transmitting ack/nack

A user equipment comprising:

• an RF (radio frequency) unit configured to transceive a radio signal with a base station;
• a memory configured to store information transceived with the base station and parameters required for an operation of the user equipment;
• and
• a processor connected to the RF unit and the memory, the processor configured to control the RF unit and the memory, wherein the processor is configured to process a method comprising:
• receiving a plurality of data units from the base station;
• bundling ACK/NACK results for a plurality of the data units per a time and/or frequency interval to obtain at least one bundled ACK/NACK result;
• performing ACK/NACK multiplexing over the at least one ACK/NACK result to determine an uplink resource for ACK/NACK transmission and a bit sequence;
• and
• transmitting the bit sequence to the base station via the uplink resource for the ACK/NACK transmission.