Method for terminal for reporting channel status information and apparatus for the method in wireless communication system supporting carrier aggregation

A user equipment (UE) configured to report aperiodic channel status information (CSI) in a wireless communication system supporting carrier aggregation of a plurality of downlink component carriers (DL CCs) and at least one uplink component carrier (UL CC), the UE comprising:

• a radio frequency (RF) unit;
• and
• a processor configured to control the RF unit,
• wherein the processor is configured to:
• receive a radio resource control (RRC) signal from a base station, each of the plurality of DL CCs being linked to a UL CC for reporting the aperiodic CSI based on the RRC signal,
• receive downlink control information (DCI) for downlink (DL) grant from a base station, the DCI triggering the aperiodic CSI and scheduling a physical downlink shared channel (PDSCH) transmission, and
• transmit the aperiodic CSI to the base station on the UL CC linked to a DL CC receiving the DCI,
• wherein, when the DCI is received on different DL CCs and the different DL CCs are linked to a same UL CC based on the RRC signal, the aperiodic CSI triggered by the DCI received on a DL CC having a lower index from among the different DL CCs is transmitted to the base station, and the aperiodic CSI triggered by the DCI received on a DL CC having a higher index from among the different DL CCs is dropped.