Reconfiguration intelligent surface device and beamforming method thereof

A reconfiguration intelligent surface (RIS) device, comprising:

• a reconfiguration intelligent surface;
• a transceiver;
• a memory;
• and
• a processor, coupled to the reconfiguration intelligent surface, the transceiver, and the memory, and configured to:
• receive a timing synchronization signal through the transceiver;
• establish a frame boundary synchronized with a radio signal transmission/reflection device according to the timing synchronization signal;
• receive beam control information through the transceiver;
• and
• form a reflected beam by reflecting, using the reconfiguration intelligent surface, a radio signal beam transmitted or reflected by the radio signal transmission/reflection device according to the beam control information based on the frame boundary synchronized with the radio signal transmission/reflection device.