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

A user equipment (UE) for reporting aperiodic channel status information (CSI) in a carrier aggregation system, the UE comprising:

• a radio frequency (RF) unit configured to transmit and receive information;
• and
• a processor configured to:
• control the RF unit to receive downlink (DL) control information (DCI) for uplink (UL) grant from a base station, the DCI including information for a CSI request;
• select one of a plurality of triggering sets;
• and
• control the RF unit to transmit CSI for a measurement target included in the selected one of the plurality of triggering sets to the BS,
• wherein a specific bit value of the information for the CSI request is related to the plurality of triggering sets,
• wherein the measurement target is at least one component carrier (CC) or at least one CSI process, and
• wherein the at least one CC or at least one CSI process is selected by circular shift selection from all CCs or CSI processes included in the selected one of the plurality of triggering sets when a CSI request for the selected one of the plurality of triggering sets is repeated.