Method and apparatus for channel state information feedback in communication system

An operation method of a base station in a communication system, comprising:

• transmitting a first reference signal through a use channel;
• receiving, from a terminal, subchannel group state information generated based on the first reference signal;
• restoring the subchannel group state information using a second neural network decoder to generate compressed subchannel state information of at least one subchannel belonging to a subchannel group;
• restoring the compressed subchannel state information using a first neural network decoder to generate subchannel state information of the at least one subchannel belonging to the subchannel group;
• and
• inferring a channel state based on the subchannel state information.

An operation method of a terminal in a communication system, comprising:

• receiving, from a base station, training set identifier (TSI) configuration information including at least one TSI;
• designating an artificial intelligence model mapped to the at least one TSI according to the TSI configuration information;
• receiving, from the base station, training indication information including the at least one TSI;
• receiving, from the base station, a signal including the at least one TSI;
• and
• training the artificial intelligence model mapped to the at least one TSI based on the received signal.