Method for feeding back channel state information in wireless communication system and apparatus therefor

A method for receiving CSI (Channel State Information) in a wireless access system, the method performed by a base station and comprising:

• transmitting first configuration information of a first CSI process associated with a first CSI-RS (Channel State Information-Resource Signal) and second configuration information of a second CSI process associated with a second CSI-RS;
• and
• receiving the CSI based on at least one of the first CSI process and the second CSI process,
• wherein a second RI (Rank Indicator) of the second CSI process is configured the same as a first RI of the first CSI process, and
• wherein a number of a first CSI-RS antenna ports of the first CSI process is the same as a number of a second CSI-RS antenna ports of the second CSI process.

A user equipment for transmitting CSI (Channel State Information) in a wireless access system, the user equipment comprising:

• a RF (Radio Frequency) module;
• and
• a processor which is configured to:
• configure a first CSI process associated with a first CSI-RS (Channel State Information-Resource Signal) and a second CSI process associated with a second CSI-RS;
• and
• transmit the CSI based on at least one of the first CSI process and the second CSI process,
• wherein a second RI (Rank Indicator) of the second CSI process is configured the same as a first RI of the first CSI process, and
• wherein a number of a first CSI-RS antenna ports of the first CSI process is the same as a number of a second CSI-RS antenna ports of the second CSI process.

A base station for receiving CSI (Channel State Information) in a wireless access system, the base station comprising:

• a RF (Radio Frequency) module;
• and
• a processor which is configured to:
• transmit first configuration information of a first CSI process associated with a first CSI-RS (Channel State Information-Resource Signal) and second configuration information of a second CSI process associated with a second CSI-RS;
• and
• receive the CSI based on at least one of the first CSI process and the second CSI process,
• wherein a second RI (Rank Indicator) of the second CSI process is configured the same as a first RI of the first CSI process, and
• wherein a number of a first CSI-RS antenna ports of the first CSI process is the same as a number of a second CSI-RS antenna ports of the second CSI process.