A method for uplink transmitting control information from a user equipment in a wireless communication system comprises selecting a specific point among a plurality of points distributed into a symbol space, corresponding to control information, the symbol space including a modulation dimension and a sequence dimension; mapping a signal corresponding to the specific point with a control channel including single carrier-frequency division multiple access (SC-FDMA) symbols; and transmitting the control channel. Preferably, the specific point belongs to the sequence dimension.