Patent ID: 7952991

Claim:
A method for transmitting control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the method comprising the steps of: generating first control information to be transmitted; spreading control information symbols including the first control information by an orthogonal code that has an index of the orthogonal code allocated to each User Equipment (UE); performing a Discrete Fourier Transform (DFT) on the spread signal and mapping the Discrete Fourier Transformed signal to a first frequency region allocated for a transmission of the first control information, thereby generating a frequency domain signal; mapping the frequency domain signal to SC-FDMA symbols through Inverse Fast Fourier Transform (IFFT); and adding Cyclic Prefix (CP) for preventing inter-symbol interference to the SC-FDMA symbols and then transmitting a CP-added signal to the Node B, wherein the index and a spreading factor of the orthogonal code are variable and the index of the orthogonal code is allocated to each UE within the first frequency region.