Patent ID: 8599819

Claim:
A method of transmitting a sounding reference signal in a wireless communication system, the method comprising: receiving, by a user equipment (UE) from a base station (BS), a simultaneous transmission indicator that indicates whether a sounding reference signal (SRS) and a hybrid automatic retransmission request (HARQ) acknowledgement/non-acknowledgement (ACK/NACK) are transmitted in a same subframe; receiving, by the UE from the BS, SRS operation information that indicates a periodicity of transmission of the SRS and a subframe offset used for the transmission of the SRS; transmitting, by the UE to the BS, the SRS, the HARQ ACK/NACK and a demodulation reference signal (DM-RS) used by the BS to demodulate the HARQ ACK/NACK in an SRS subframe when the simultaneous transmission indicator indicates that the SRS and the HARQ ACK/NACK are transmitted in the same subframe; and transmitting, by the UE to the BS, the HARQ ACK/NACK and the DM-RS in the SRS subframe without the SRS when the simultaneous transmission indicator indicates that the SRS and the HARQ ACK/NACK are not transmitted in the same subframe, wherein the SRS subframe is determined from among a plurality of subframes according to the SRS operation information, wherein the SRS is transmitted in a last single carrier-frequency division multiple access (SC-FDMA) symbol of the SRS subframe, and wherein the HARQ ACK/NACK and the DM-RS are transmitted in remaining SC-FDMA symbols of the SRS subframe.