Wireless communication system, and device and method in wireless communication system
Disclosed are a device and method in a wireless communication system. The device comprises: a first generating unit configured to generate a first pre-coding matrix according to first channel information on a channel between a first communication apparatus and a second communication apparatus; a second generating unit configured to generate a second pre-coding matrix according to the first pre-coding matrix and second channel information on the channel; and a pre-coding unit configured to pre-code a data signal according to the first pre-coding matrix and the second pre-coding matrix. According to the embodiments of the present invention, interference between user equipment can be effectively removed, the operation complexity is reduced, and the whole performance of the system is optimized.
1. A device for a user equipment in a wireless communication system, the device comprising:
circuitry, configured to
measure a beamformed second reference signal from a first communication apparatus, the measurement of the second reference signal is according to a first code book, and
generate, 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,
measure, 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 measurement of the first reference signal including quantization performed according to a second code book different from the first code book; and
generate, based on the measurement of the first reference signal, feedback information as second channel information on the channel between the first communication apparatus and the user equipment.
2. The device according to claim 1 , wherein the first reference signal includes a narrowband signal.
3. The device according to claim 2 , wherein the circuitry is configured to estimate a narrowband channel based on the first reference signal in the specific beam and feed back narrowband channel information.
4. The device according to claim 1 , wherein the second reference signal covers a relatively wide range.
5. The device according to claim 4 , wherein the second reference signal includes a wideband signal and circuitry is configured to estimate a wideband channel based on the second reference signal and feed back wideband channel information.
6. The device according to claim 1 , wherein a direction of the beamformed second reference signal is different than a direction of the specific beam.
7. The device according to claim 6 , wherein the direction of the beamformed second reference signal is one of a vertical direction and a horizontal direction, and the direction of the specific beam is the other one of the vertical direction and the horizontal direction.
8. The device according to claim 1 , wherein the second reference signal is beamformed using static/semi-static beamforming.
9. 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.
10. The method according to claim 9 , wherein the first reference signal includes a narrowband signal.
11. The method according to claim 10 , further comprising:
estimating a narrowband channel based on the first reference signal in the specific beam; and
feeding back narrowband channel information.
12. The method according to claim 9 , wherein the second reference signal covers a relatively wide range.
13. The method according to claim 12 , wherein the second reference signal includes a wideband signal and the method further comprising:
estimating a wideband channel based on the second reference signal; and
feeding back wideband channel information.
14. 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.
15. 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.