Method and apparatus for csi-rs setting for beam management in wireless communication system

A user equipment (UE) for determining a beam to be sued for communication in a millimeter wave (mmWave) communication system, the UE comprising:

• a receiver configured to receive a signal from an external device;
• a transmitter configured to transmit a signal to an external device;
• and
• a processor configured to control the receiver and the transmitter,
• wherein the processor is configured to receive a synchronization signal (SS) block or a channel state information-reference signal (CSI-RS) from a base station (BS) through the receiver, to report a preferred primary beam based on the received SS block or CSI-RS to the BS through the transmitter, to receive secondary beam information based on the preferred primary beam from the BS through the receiver, to report a preferred secondary beam based on the secondary beam information to the BS through the transmitter, and to be configured with a CSI-RS resource based on the preferred secondary beam by the BS, and
• wherein the secondary beam information includes information about at least one secondary beam quasi-co-located (QCLed) with the preferred primary beam.