Method and device for providing feedback signal in wireless communication system using two-dimensional antenna
Disclosed is a 5G or pre-5G communication system to be provided for supporting a data transmission rate higher than that of a 4G communication system such as LTE. According to one embodiment of the present invention, a method by which a base station of a wireless communication system using a two-dimensional X-Pol antenna requests feedback information, can comprise the steps of: generating control information for commanding the generation of the feedback information and channel state information (CSI) process information on vertical axes and horizontal axes of a specific planar antenna and respective planar antennas of the two-dimensional X-Pol antenna; transmitting the generated control information to a terminal in the base station; generating and transmitting a reference signal corresponding to the CSI process; and receiving, from at least one terminal, feedback information in correspondence to the number of CSI processes.
1. A method for a base station to request feedback information in a wireless communication system using a 2-dimensional (2D) cross polarization (X-Pol) antenna, comprising:
generating control information including channel state information (CSI) process information of the 2D X-Pol antenna and instruction information on generation of the feedback information, wherein the 2D X-Pol antenna has a first planar and a second planar, and the CSI process information includes a first CSI process for the first planar and a second CSI process for the second planar;
transmitting the generated control information to a terminal;
generating a first reference signal to be transmitted via the first planar and a second reference signal to be transmitted via the second planar based on the CSI process information;
alternatively transmitting the first reference signal and the second reference signal to the terminal based on the CSI process information;
receiving, from the terminal, first feedback information corresponding to the first CSI process and second feedback information corresponding to the second CSI process based on the CSI process information;
obtaining a first precoding matrix indicator (PMI) based on the first feedback information and a second PMI based on the second feedback information;
determining channel information using the first PMI and the second PMI; and
transmitting data to the terminal based on the channel information.
2. The method of claim 1 , wherein the first CSI process is for a vertical axis of the 2D X-Pol antenna, and the second CSI process is for a horizontal axis of the 2D X-Pol antenna.
3. The method of claim 1 , wherein the instruction information indicates to transmit the first feedback information and the second feedback information at one time.
4. The method of claim 1 , wherein the instruction information indicates to transmit the first feedback information and the second feedback information, respectively.
5. A method for a terminal to generate and transmit feedback information in a wireless communication system using a 2-dimensional (2D) cross polarization (X-Pol) antenna, comprising:
receiving, from a base station, control information including channel state information (CSI) process information of the 2D X-Pol antenna and instruction information on generation of the feedback information, wherein the 2D X-Pol antenna has a first planar and a second planar, and the CSI process information includes a first CSI process for the first planar and a second CSI process for the second planar;
alternatively receiving, from the base station, a first reference signal and a second reference signal based on the CSI process information;
generating first feedback information using the received first reference signal and second feedback information using the received second reference signal; and
transmitting, to the base station, the first feedback information and the second feedback information based on the instruction information,
wherein the base station is configured to:
receive the first feedback information corresponding to the first CSI process and the second feedback information corresponding to the second CSI process based on the CSI process information;
obtain a first precoding matrix indicator (PMI) based on the first feedback information and a second PMI based on the second feedback information;
determine channel information using the first PMI and the second PMI; and
transmit data to the terminal based on the channel information.
6. The method of claim 5 , wherein the instruction information indicates to transmit the first feedback information and the second feedback information at one time.
7. The method of claim 5 , wherein instruction information indicates to transmit the first feedback information and the second feedback information, respectively.
8. The method of claim 5 , wherein the first CSI process is for a vertical axis of the 2D X-Pol antenna, and the second CSI process is for a horizontal axis of the 2D X-Pol antenna.
9. A base station in a wireless communication system using a 2D cross polarization (X-Pol) antenna, comprising:
the 2D X-Pol antenna having a first planar and a second planar;
a base station communication circuitry configured to transmit control information and the reference signal to a terminal, and to receive feedback information corresponding from the terminal; and
a base station controller configured to:
generate control information including channel state information (CSI) process information of the 2D X-Pol antenna and instruction information on generation of the feedback information, wherein the 2D X-Pol antenna has a first planar and a second planar, and the CSI process information includes a first CSI process for the first planar and a second CSI process for the second planar,
transmit the generated control information to the terminal,
generate a first reference signal to be transmitted via the first planar and a second reference signal to be transmitted via the second planar based on the CSI process information,
alternately transmit the first reference signal and the second reference signal to the terminal based on the CSI process information,
receive first feedback information corresponding to the first CSI process and second feedback information corresponding to the second CSI process based on the control information,
obtain a first precoding matrix indicator (PMI) based on the first feedback information and a second PMI based on the second feedback information,
determine channel information using the first PMI and the second PMI, and
transmit data to the terminal based on the channel information.
10. The base station of claim 9 , wherein the first CSI process is for a vertical axis of the 2D X-Pol antenna, and the second CSI process is for a horizontal axis of the 2D X-Pol antenna.
11. The base station of claim 9 , wherein the instruction information indicates to transmit the first feedback information and the second feedback information at one time.
12. The base station of claim 9 , wherein instruction information indicates to transmit the first feedback information and the second feedback information, respectively.
13. A terminal to generate and transmit feedback information in a wireless communication system using a 2-dimensional (2D) cross polarization (X-Pol) antenna, comprising:
a terminal communication circuitry configured to:
receive control information including channel state information (CSI) process information of the 2D X-Pol antenna and instruction information on generation of the feedback information, and
alternatively receive a first reference signal and a second reference signal, wherein the 2D X-Pol antenna has a first planar and a second planar, and the CSI process information includes a first CSI process for the first planar and a second CSI process for the second planar; and
a terminal controller configured to:
generate first feedback information using the received first reference signal and second feedback information using the received second reference signal; and
transmit the first feedback information and the second feedback information to the base station based on the instruction information,
wherein the base station is configured to:
receive the first feedback information corresponding to the first CSI process and the second feedback information corresponding to the second CSI process based on the CSI process information;
obtain a first precoding matrix indicator (PMI) based on the first feedback information and a second PMI based on the second feedback information;
determine channel information using the first PMI and the second PMI; and
transmit data to the terminal based on the channel information.
14. The terminal of claim 13 , wherein the instruction information indicates to transmit the first feedback information and the second feedback information at one time.
15. The terminal of claim 13 , wherein instruction information indicates to transmit the first feedback information and the second feedback information, respectively.
16. The terminal of claim 13 , wherein the first CSI process is for a vertical axis of the 2D X-Pol antenna, and the second CSI process is for a horizontal axis of the 2D X-Pol antenna.