Patent ID: 10355763

Abstract:
A method for reporting a channel state of a downlink channel transmitted through two-dimensionally arranged Nt number of antenna ports, according to one embodiment of the present disclosure, is performed by a terminal, and the method comprises the steps of: receiving a reference signal (RS) configuration for measuring a channel for the two-dimensionally arranged Nt number of antenna ports, wherein the RS is code division multiplexed (CDM) and is transmitted through the Nt number of antenna ports; and receiving the RS by using the received RS configuration, and calculating channel state information on a downlink channel so as to report the channel state information to a serving cell, wherein the reported channel state information includes a precoding matrix for the transmission of the RS, and the precoding matrix for the transmission of the RS can be subset of a codebook for a precoding matrix for the data transmission of the Nt number of antenna ports.