Transmission power control method of base station in OFDMA-based wireless communication system

A method for controlling a power amplifier of a base station in a wireless communication system, the method comprising:

• receiving, at a radio frequency (RF) unit of the base station, a first symbol and a second symbol in a subframe from a digital unit of the base station;
• based on the first symbol and the second symbol in the subframe received from the digital unit, detecting, at the RF unit of the base station, power of each of the first symbol and the second symbol in the subframe;
• determining, at the RF unit, whether each of the first symbol and the second symbol includes data based on a result of the detecting;
• based on determining that the first symbol does not include data, controlling, at the RF unit, to turn off a bias of the power amplifier to be turned off in a duration of the first symbol in the subframe;
• and
• based on determining that the second symbol includes data, controlling, at the RF unit, to turn on the bias of the power amplifier for a duration of transmitting of signals corresponding to the second symbol in the subframe,
• wherein the determining of whether each of the first symbol and the second symbol in the subframe includes data is performed by the RF unit without using symbol information received by the RF unit from the digital unit that indicates whether each of the first symbol and the second symbol in the subframe includes data.