Patent ID: 8488549

Claim:
A method of transmitting uplink control information at a communication apparatus configured with Time Division Duplex (TDD) and a plurality of cells in a wireless communication system, the method comprising: receiving at least one of one or more Physical Downlink Control Channel (PDCCH) signals and one or more Physical Downlink Shared Channel (PDSCH) signals within M downlink subframes where M≧1; generating acknowledgement information per cell in response to the at least one of one or more PDCCH signals and one or more PDSCH signals; and transmitting a plurality of per-cell acknowledgement information on a uplink subframe corresponding to the M downlink subframes, the plurality of per-cell acknowledgement information being concatenated sequentially in order of cell index, wherein if a specific PDSCH signal without a corresponding PDCCH signal is present among the one or more PDSCH signals, acknowledgment information in response to the specific PDSCH signal is placed at an end of per-cell acknowledgment information configured for a cell on which the specific PDSCH signal is received.