Patent ID: 8831042

Claim:
A method for transmitting a reference signal in a wireless communication system, the method comprising: receiving, by a user equipment, a message including a sounding indicator from a base station, the sounding indicator indicating whether the user equipment is configured to support a transmission of an uplink control signal and a sounding reference signal in one subframe; and determining, by the user equipment, periodically a subframe in which the sounding reference signal is allowed to be transmitted to the base station, the subframe comprising two slots, each of the two slots comprising a plurality of data single carrier-frequency division multiple access (SC-FDMA) symbols and a plurality of reference signal (RS) SC-FDMA symbols; transmitting, by the user equipment, the uplink control signal and the sounding reference signal in the determined subframe to the base station if the user equipment is configured to support the transmission of the uplink control signal and the sounding reference signal, wherein transmitting the uplink control signal and the sounding reference signal in the determined subframe comprises: mapping the uplink control signal to the plurality of data SC-FDMA symbols of each of the two slots; mapping a demodulation reference signal for demodulating the uplink control signal to the plurality of RS SC-FDMA symbols of each of the two slots; puncturing only one SC-FDMA symbol of the plurality of data SC-FDMA symbols of one of the two slots; mapping the sounding reference signal to the punctured SC-FDMA symbol; and transmitting the uplink control signal, the demodulation reference signal and the sounding reference signal in the determined subframe via the SC-FDMA symbols to which the uplink control signal, the demodulation reference signal and the sounding reference signal are mapped, wherein the uplink control signal mapped to the plurality of data SC-FDMA symbols of the one of the two slots is spread by a first orthogonal sequence, wherein the uplink control signal mapped to the plurality of data SC-FDMA symbols of the other of the two slots is spread by a second orthogonal sequence having a length different from a length of the first orthogonal sequence, and wherein the uplink control signal mapped to the plurality of data SC-FDMA symbols of the one of the two slots is spread by a spreading factor of 3, and wherein the uplink control signal mapped to the plurality of data SC-FDMA symbols of the other of the two slots is spread by a spreading factor of 4.