Method for determining bit size of rank indicator in wireless communication system and apparatus therefor

摘要

In the present application, a method for a terminal to report a rank indicator to a base station in a wireless access system is disclosed. The rank indicator reporting method comprises: 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 them; and reporting the indicator indicating the selected one CSI-RS resource and the rank indicator at the base station, wherein the bit size of the rank indicator is It is determined based on the maximum number of antenna ports for a plurality of CSI-RS resources. [Selection] FIG.