Patent ID: 8472471

Claim:
A method of transmitting uplink control information at a communication apparatus in a Time Division Duplex (TDD) wireless communication system, the method comprising: receiving at least one of one or more Physical Downlink Control CHannels (PDCCHs) and one or more Physical Downlink Shared CHannels (PDCCHs); and generating reception response information about the at least one of the one or more PDCCHs and the one or more PDCCHs, wherein when a transmission time of the reception response information and a transmission time of channel status information are collided, if a certain condition is satisfied, the reception response information and the channel status information are transmitted together using a first Physical Uplink Control CHannel (PUCCH) format, wherein when the transmission time of the reception response information and the transmission time of the channel status information are collided, if the certain condition is not satisfied, the reception response information is transmitted using a second PUCCH format and the channel status information is dropped, wherein the certain condition includes at least one of the following conditions (1) to (3): (1) a single PDSCH transmission only on a Primary Cell (PCell) indicated by detection of a PDCCH having a Downlink Assignment Index (DAI) initial value is present; (2) a single PDCCH transmission only on the PCell that has the DAI initial value and indicates a Semi-Persistent Scheduling (SPS) release is present; and (3) a single PDSCH transmission only on the PCell where there is not a corresponding PDCCH is present.