Patent ID: 8570852

Claim:
A method of transmitting control signals in a wireless communication system, wherein the method comprises: configuring, by a user equipment, an uplink control channel in a subframe, the subframe comprising two consecutive slots, each slot comprising a plurality of data orthogonal frequency division multiplexing (OFDM) symbols and first and second reference signal (RS) OFDM symbols, wherein the uplink control channel has a first mode for transmitting a channel quality indicator (CQI) signal and a second mode for transmitting both a CQI signal and an acknowledgment/non-acknowledgement (ACK/NACK) signal; in any of the first and second modes of the uplink control channel: generating a plurality of spread modulation symbols based on the CQI signal using a frequency domain sequence; and mapping the spread modulation symbols to the plurality of data OFDM symbols of the slot; in the first mode of the uplink control channel: generating two CQI RS symbols for use, by a base station, to demodulate the CQI signal; and mapping the two CQI RS symbols to the first and second RS OFDM symbols of the slot, respectively; in the second mode of the uplink control channel: generating first and second RS symbols for use, by a base station, to demodulate the CQI signal, wherein the first RS symbol is independent from the ACK/NACK signal, and the ACK/NACK signal is multiplexed into the second RS symbol; and mapping the first and second RS symbols to the first and second RS OFDM symbols of the slot, respectively; transmitting, by the user equipment, the data and RS OFDM symbols mapped according to one of the first and second modes on the uplink control channel in the subframe.