7. A terminal for uplink transmission in a wireless communication system, the terminal comprising:a transmitter and a receiver of the terminal; and
a processor of the terminal configured to control the transmitter and the receiver, wherein the processor is further configured to:
receive a first control signal informing a shortened transmission time interval (sTTI) or a symbol position in which a reference signal for demodulating data transmitted in a plurality of sTTIs is transmitted,
receive a second control signal containing information indicating informing the plurality of sTTIs in which the data is transmitted,
transmit the reference signal in the informed sTTI or symbol position and transmit the data in the plurality of sTTIs according to the first control signal and the second control signal,
wherein the reference signal is common for the data transmitted in the plurality of sTTIs, and
wherein the second control signal includes an interval of a sTTI unit or a symbol unit between the sTTI or symbol position in which the reference signal is transmitted and the plurality of sTTIs.