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

A User Equipment (UE) for which a plurality of Channel State Information (CSI)-Reference Signal (RS) configurations is configured in a wireless communication system, the UE comprising:

• a reception module;
• and
• a processor,
• wherein the processor is configured to
• receive a first uplink-downlink (UL-DL) configuration indicating whether each of a plurality of subframes is configured as a UL subframe or a DL subframe,
• receive a second UL-DL configuration to reconfigure a UL subframe indicated by the first UL-DL configuration to a DL subframe indicated by the second UL-DL configuration,
• receive a downlink signal including a Downlink Control Information (DCI) format including a CSI request field,
• determine a Channel Quality Indicator (CQI) value based on a Physical Downlink Shared Channel (PDSCH) transport block in a CSI reference resource when the CSI request field triggers CSI reporting, and
• perform CSI reporting including the CQI value in a subframe n, where n is an arbitrary identifier,
• wherein the CSI reference resource is a last valid subframe among subframes which precede the subframe n by four subframes,
• wherein the CSI reference resource is a DL subframe indicated by the first UL-DL configuration, and
• wherein the DL subframe indicated by the first UL-DL configuration and that is the CSI reference resource is not reconfigured by the second UL-DL configuration.