Method by which terminal receives downlink signal from base station in wireless communication system, and device therefor

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

• a wireless communication part;
• and
• a processor coupled with the wireless communication part, and configured to receive information on a plurality of CSI (channel status information) processes, wherein each of the plurality of CSI processes includes two or more CSI-RSs (channel status information-reference signals), receive a downlink control signal including a flag of a 1-bit size and an indicator indicating a specific CSI-RS, select a QCL (quasi co-located) CSI process having the specific CSI-RS set as a representative CSI-RS from the plurality of CSI processes, select a QCL CSI-RS of a DMRS (demodulation-reference signal) based on the flag, and receive a downlink data signal using the DM-RS and the QCL CSI-RS,
• wherein a CSI-RS corresponding to a most recently reported CSI-RS indicator among the two or more CSI-RSs included in the QCL CSI process is selected as the QCL CSI-RS of the DM-RS based on that the flag has a first value, and
• wherein the specific CSI-RS is selected as the QCL CSI-RS of the DM-RS based on that the flag has a second value.