Csi-rs based channel estimating method in a wireless communication system and device for same

A user equipment in a wireless communication system, the user equipment comprising:

• a radio frequency (RF) module;
• and
• a processor connected with the RF module,
• wherein the processor configures channel status information-reference signal (CSI-RS) resources and zero power CSI-RS resources through a higher layer, and computes a channel quality indicator (CQI) value based on a channel measurement and an interference measurement,
• wherein the channel measurement is performed by using the CSI-RS resources and the interference measurement is performed by using the zero power CSI-RS resources, and
• wherein, if two CSI subframe sets are configured, the interference measurement for one CSI subframe set of the two CSI subframe sets is performed by using the zero power CSI-RS resources within a subframe subset belonging to the one CSI subframe set.

A method of receiving a channel quality indicator (CQI) value from a user equipment by a base station in a wireless communication system, the method comprising:

• configuring, through a higher layer to the user equipment, channel status information-reference signal (CSI-RS) resources and zero power CSI-RS resources;
• and
• receiving the CQI value computed based on a channel measurement and an interference measurement from the user equipment,
• wherein the user equipment performs the channel measurement by using the CSI-RS resources and performs the interference measurement by using the zero power CSI-RS resources, and
• wherein, if two CSI subframe sets are configured, the interference measurement for one CSI subframe set of the two CSI subframe sets is performed by using the zero power CSI-RS resources within a subframe subset belonging to the one CSI subframe set.

A base station in a wireless communication system, the base station comprising:

• a radio frequency (RF) module;
• and
• a processor connected with the RF module,
• wherein the processor configures channel status information-reference signal (CSI-RS) resources and zero power CSI-RS resources through a higher layer to the user equipment,
• wherein the processor controls the RF module to receive a channel quality indicator (CQI) value computed based on a channel measurement and an interference measurement from the user equipment,
• wherein the user equipment performs the channel measurement by using the CSI-RS resources and performs the interference measurement by using the zero power CSI-RS resources, and
• wherein, if two CSI subframe sets are configured, the interference measurement for one CSI subframe set of the two CSI subframe sets is performed by using the zero power CSI-RS resources within a subframe subset belonging to the one CSI subframe set.