Patent ID: 7929415

Claim:
A method of transmitting control signals in a wireless communication system, comprising: configuring, by a user equipment, an uplink control channel for a first control signal in a subframe, the subframe comprising two consecutive slots, each slot comprising a plurality of data orthogonal frequency division multiplexing (OFDM) symbols and a plurality of reference signal (RS) OFDM symbols, wherein configuring the uplink control channel comprises: generating a plurality of first modulation symbols by modulating the first control signal; spreading each of the plurality of first modulation symbols with each of a plurality of frequency domain sequences, thereby generating a plurality of spread modulation symbols, wherein the plurality of frequency domain sequences are generated by cyclically shifting a base sequence; mapping each of the spread modulation symbols to each of the plurality of data OFDM symbols; generating a plurality of RS sequences for a RS used for demodulating the first control signal; and mapping each of a plurality of RS sequences to each of the plurality of RS OFDM symbols; generating, by the user equipment, a second modulation symbol by modulating a second control signal; multiplexing, by the user equipment, the second control signal on the uplink control channel by multiplying the second modulation symbol to one of the plurality of RS sequences; and transmitting, by the user equipment, the first control signal and the second control signal on the uplink control channel in the subframe.