Device and method for transmitting data in wireless communication system

The method of claim 11, wherein transmitting the uplink data comprises:

• in response to a precoding scheme of the terminal being based on uplink measurement, applying, to the uplink data, a precoder of a precoding matrix indicator (PMI) transmitted from the base station to the terminal;
• and
• in response to the precoding scheme being based on downlink measurement, applying, to the uplink data, a precoder which is calculated based on a measurement result of the reference signal, and
• wherein the indication information indicates whether the precoding scheme is based on the uplink measurement or is based on the downlink measurement, according to the satisfaction or non-satisfaction of the channel reciprocity.

A method for operating in a base station, the method comprising:

• transmitting, to a terminal, indication information for controlling a beamforming operation of the terminal, determined according to whether channel reciprocity with the terminal is satisfied;
• receiving a reference signal from the terminal;
• and
• transmitting downlink data to the terminal based on the indication information and the reference signal.

A terminal comprising:

• at least one transceiver;
• and
• at least one processor operatively coupled with the at least one transceiver,
• wherein the at least one processor is configured to:
• receive, from a base station, indication information for controlling a beamforming operation of the terminal, determined according to whether channel reciprocity with the base station is satisfied;
• receive, from the base station, a reference signal;
• and
• transmit uplink data to the base station based on the indication information and the reference signal.