Patent ID: 8917603

Claim:
A method for transmitting uplink control information in a wireless communication system supporting carrier aggregation and operating in time division duplex (TDD), the method comprising: receiving at least one of one or more physical downlink control channels (PDCCHs) and one or more physical downlink shared channels (PDSCHs) in a plurality of downlink subframes according to an uplink-downlink (UL-DL) configuration: determining a number of bits of acknowledgement/negative acknowledgement (ACK/NACK) information on the at least one of one or more PDCCHs and the one or more PDSCHs using a value indicated by a predetermined 2-bit field in a downlink control information (DCI) format for UL scheduling; and transmitting the number of bits of ACK/NACK information through a physical uplink shared chnnel (PUSCH) corresponding to the DCI format, wherein the number of bits of ACK/NACK information is determined using: V DAI UL +4┌(U max −V DAI UL )/4┐ wherein V DAI UL denotes the value indicated by the predetermined 2-bit field and is an integer in a range of 1 to 4, U max denotes a maximum value from among a plurality of PDSCH signals and PDCCH signals received in the plurality of downlink subframes for respective component carriers, and ┌ ┐ represents a ceiling function.