Channel state information transmission/reception method and apparatus for use in wireless communication system

A signal communication method of a terminal in a wireless communication system, the method comprising:

• receiving at least one reference signal for antenna ports formed in first and second directions identified based on directions of a plurality of antennas from a base station;
• receiving a feedback configuration from the base station, the feedback configuration including a value of rank indicator (RI) for the first direction;
• and
• transmitting feedback information identified based on the at least one reference signal and the feedback configuration,
• wherein the feedback information comprises the value of RI for the second direction identified based on the at least one reference signal and the value of RI for the first direction.

A base station of a wireless communication system, the base station comprising:

• a transceiver including a plurality of antennas;
• and
• a control unit, configured to control the transceiver, and further configured to:
• identify antenna ports of first and second directions based on directions of the plurality of antennas,
• transmit at least one reference signal for the antenna ports to a terminal,
• transmit a feedback configuration to the terminal, the feedback configuration including a value of rank indicator (RI) for the first direction, and
• receive feedback information from the terminal based on the at least one reference signal and the feedback configuration,
• wherein the feedback information comprises the value of RI for the second direction identified based on the at least one reference signal and the value of RI for the first direction.

A terminal of a wireless communication system, the terminal comprising:

• a transceiver configured to transmit and receive to and from a base station including a plurality of antennas;
• and
• a control unit, configured to control the transceiver, and further configured to:
• receive at least one reference signal for antenna ports formed in first and second directions identified based on directions of the plurality of antennas from a base station, and
• receive a feedback configuration from the base station, the feedback configuration including a value of rank indicator (RI) for the first direction, and
• transmit feedback information identified based on the at least one reference signal and the feedback configuration,
• wherein the feedback information comprises the value of RI for the second direction identified based on the at least one reference signal and the value of RI for the first direction.