The present application discloses a method for a terminal to report a rank indicator to a base station in a wireless access system. The Rank indicator reporting method includes: setting a plurality of CSI-RS (Channel Status Information-Reference Signal) resources for one CSI (Channel Status Information) process through an upper layer; Selecting one of the plurality of CSI-RS resources; And reporting to the base station an indicator indicating the selected one CSI-RS resource and the rank indicator, wherein the bit size of the rank indicator is a maximum number of antenna ports for the plurality of CSI- Is determined based on / RTI
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