Patent ID: 7852959

Claim:
A method of transmitting a control signal in a wireless communication system, performed by a user equipment, the method comprising: determining a cyclic shift value for a first control signal in a multiplexed resource block, wherein the cyclic shift value for the first control signal is determined so that the first control signal and a second control signal are identified by different cyclic shift values of a base sequence in the multiplexed resource block; generating a spread control signal by spreading the first control signal with a cyclic shifted sequence which is obtained by cyclically shifting the base sequence with the cyclic shift value for the first control signal; and transmitting the spread control signal in the multiplexed resource block, wherein the multiplexed resource block is defined by a plurality of subcarriers in a frequency domain and a slot in a time domain, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, and wherein a number of OFDM symbols used for a reference signal of the first control signal in the multiplexed resource block is greater than a number of OFDM symbols used for a reference signal of the second control signal in the multiplexed resource block.