Method and apparatus for performing communication based on hybrid beamforming in wireless communication system

A user equipment (UE) for performing communication based on hybrid beamforming in a wireless communication system, the UE comprising:

• a radio frequency (RF) unit that transmits and receives a radio signal;
• and
• a processor operatively connected to the RF unit,
• wherein the processor:
• transmits a dedicated scheduling request to a base station (BS), the dedicated scheduling request indicating a first scheduling request that is a request to transmit beam state information (BSI), multiplexed on an uplink data channel, or a second scheduling request that is a request to allocate a resource for a reference signal for beam refinement information (BRI);
• when the dedicated scheduling request indicates the first scheduling request,
• receives an uplink grant comprising a response to the first scheduling request from the BS;
• and
• feeds the BSI back, multiplexed on the uplink data channel, to the BS.