Method for reporting channel state reflecting interference cancellation performance and apparatus for same

1. A method for reporting a channel state reflecting symbol-level interference cancellation (SLIC) performance in a wireless communication system, the method being performed by a UE and comprising:

receiving, from a serving cell, a configuration for a channel state information (CSI) process (hereinafter, referred to as “enhanced CSI process”) for reporting the channel state in which the SLIC performance is reflected;

receiving a signal in a CSI-interference measurement (CSI-IM) resource based on the enhanced CSI process,

wherein the signal, which is received in the CSI-IM resource, comprises a downlink signal from the serving cell and interference signals from one or more interference cells;

cancelling an interference signal from the downlink signal received in the CSI-IM resource,

wherein the interference signal is from a dominant interference cell of the one or more interference cells; and

calculating a value (hereinafter, referred to as “enhanced channel quality information (enhanced CQI)”) of the channel state report in which the SLIC performance is reflected,

wherein the downlink signal from the serving cell comprises a dummy signal to which the same modulation order, precoding matrix indicator (PMI), rank as physical downlink shared channel (PDSCH) of the resource block (RB) are applied.

2. The method according to claim 1 , wherein, if a received power of the interference signal from the dominant interference cell is same as or greater than a threshold value, the enhanced CQI is calculated and is reported to the serving cell.

3. The method according to claim 2 , wherein the received power of the interference signal from the dominant interference cell is measured at a measurement window corresponding to a predetermined frequency or time.

4. The method according to claim 1 , further comprising receiving information on a restricted parameter from the serving cell.

5. A UE configured to report a channel state reflecting symbol-level interference cancellation performance (SLIC) in a wireless communication system, the UE comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is further configured to:

control the RF unit to receive, from a serving cell, a configuration for a channel state information (CSI) process (hereinafter, referred to as “enhanced CSI process”) for reporting the channel state in which the SLIC performance is reflected,

control the RF unit to receive signal at a CSI-interference measurement (CSI-IM) resource based on the enhanced CSI process,

wherein the signal, which is received in the CSI-IM resource, comprises a downlink signal from the serving cell and interference signals from one or more interference cells,

cancel an interference signal from the downlink signal received in the CSI-IM resource,

wherein the interference signal is from a dominant interference cell of the one or more interference cells, and

calculate a value (hereinafter, referred to as “enhanced channel quality information (CQI)”) of the channel state report in which the SLIC performance is reflected,

wherein the downlink signal from the serving cell comprises a dummy signal to which the same modulation order/PMI/rank/TM as physical downlink shared channel (PDSCH) of the resource block (RB) are applied.

6. The UE according to claim 5 , wherein, if a received power of the interference signal from the dominant interference cell is same as or greater than a threshold value, the enhanced CQI is calculated and is reported to the serving cell.

7. The UE according to claim 6 , wherein the received power of the interference signal from the dominant interference cell is measured at a measurement window corresponding to a predetermined frequency or time.

8. The UE according to claim 5 , wherein the processor is further configured to receive information on a restricted parameter from the serving cell.