Method and apparatus for feeding back channel state information for 3d mimo in wireless communication system

A user equipment (UE) in a wireless communication system comprising:

• a wireless communication module configured to transmit and receive a signal to and from a base station;
• and
• a processor configured to process the signal,
• wherein the processor controls the wireless communication module to configure a two-dimensional (2D) antenna array transmission mode of a downlink data channel via a higher layer, to receive an indicator corresponding to one of transmission schemes of the downlink data channel via the higher layer, to calculate the channel state information on the assumption of one transmission scheme of the downlink data channel corresponding to the indicator and to report the calculated channel state information to the base station, and
• wherein the transmission schemes of the downlink data channel include a demodulation-reference signal (DM-RS) based large delay (LD) cyclic delay diversity (CDD) transmission scheme and a closed loop multiplexing transmission scheme in the 2D antenna array transmission mode.