Wireless communication system, and device and method in wireless communication system

A method of operating a wireless communication system including a user equipment, the method comprising:

• measuring a beamformed second reference signal from a first communication apparatus, the measuring the second reference signal is according to a first code book, and generating, based on the measurement of the second reference signal, feedback information as first channel information on a channel between the first communication apparatus and the user equipment;
• measuring, based on measurement configuration information for the user equipment from the first communication apparatus, a first reference signal in a specific beam corresponding to the first channel information from the first communication apparatus, the measurement configuration information including a measurement indication for the first reference signal, the measuring of the first reference signal including quantization performed according to a second code book different from the first code book;
• and
• generating, based on the first reference signal, feedback information as second channel information on the channel between the first communication apparatus and the user equipment.

A device for a first communication apparatus in a wireless communication system, the device comprising:

• circuitry, configured to
• transmit a beamformed second reference signal to a user equipment, and receive, from the user equipment based on the measurement of the second reference signal, feedback information of first channel information on a channel between the first communication apparatus and the user equipment, the measurement of the second reference signal is according to a first code book;
• provide, to the user equipment, measurement configuration information including a measurement indication for a first reference signal;
• transmit a first reference signal in a specific beam corresponding to the first channel information to the user equipment, and
• receive, from the user equipment based on the measurement of the first reference signal, feedback information of second channel information on the channel between the first communication apparatus and the user equipment, the measurement of the first reference signal including quantization performed according to a second code book different from the first code book.

A method for a first communication apparatus in a wireless communication system, the method comprising:

• transmitting a beamformed second reference signal to a user equipment, and receive, from the user equipment based on the measurement of the second reference signal, feedback information of first channel information on a channel between the first communication apparatus and the user equipment, the measurement of the second reference signal is according to a first code book;
• providing, to the user equipment, measurement configuration information including a measurement indication for a first reference signal;
• transmitting a first reference signal in a specific beam corresponding to the first channel information to the user equipment, and
• receiving, from the user equipment based on the measurement of the first reference signal, feedback information of second channel information on the channel between the first communication apparatus and the user equipment, the measurement of the first reference signal including quantization performed according to a second code book different from the first code book.