Method for reporting channel state in wireless communication system and apparatus therefor

A terminal configured to report an aperiodic channel state in a wireless communication system, comprising:

• a transmitter;
• a receiver;
• and
• a processor operatively coupled to and controlling the transmitter and the receiver,
• wherein the processor is configured to:
• receive a configuration for one or more channel state information (CSI) processes including a plurality of CSI-reference signal (CSI-RS) resources from a base station, wherein a precoding is applied to each of the plurality of the CSI-RS resources,
• receive an aperiodic CSI report request from the base station at subframe #n, and
• transmit an aperiodic CSI on a CSI process indicated by the received aperiodic CSI report request to the base station at subframe #n+4,
• wherein the transmitted aperiodic CSI includes a CSI-RS resource index for the indicated CSI process,
• wherein, when a predetermined time does not elapse after the CSI-RS resource index for the indicated CSI process was reported and last updated to the base station, the CSI-RS resource index for the indicated CSI process included in the transmitted aperiodic CSI is not updated, and
• wherein the predetermined time corresponds to a time period for 5 subframes.