Patent ID: 8279824

Claim:
A method of transmitting control signals in a wireless communication system, the method comprising: spreading a first control signal with a first orthogonal code to generate a first spread control signal; spreading a second control signal with a second orthogonal code, different from the first orthogonal code, to generate a second spread control signal; and transmitting the first spread control signal and the second spread control signal in a control channel region; wherein the control channel region comprises a plurality of tiles includes 4 subcarriers by 3 orthogonal frequency division multiplexing (OFDM) symbols; wherein the plurality of tiles are divided into a first set of tiles and a second set of tiles, and the first set of tiles is disposed in preceding 3 OFDM symbols and the second set of tiles is disposed in 3 OFDM symbols next to the preceding 3 OFDM symbols; and wherein tiles in the first set are not contiguous with each other in frequency domain and tiles in the second set are not contiguous with each other in frequency domain.