Method and device for reporting channel state information in wireless communication system
A method and device for reporting channel state information in a wireless communication system is disclosed. The method for reporting channel state information (CSI) by means of a terminal in a wireless communication system according to an embodiment of the present invention includes: measuring a first reference signal transmitted from a first subset of antenna ports from among a plurality of antenna ports in a base station; measuring a second reference signal transmitted from a second subset of antenna ports from among the plurality of antenna ports; and reporting the CSI to the base station based on at least one of the measurement of the first reference signal and the measurement of the second reference signal, wherein at least one of the plurality of antenna ports is included in both the first subset and the second subset.
1. A method of reporting channel state information (CSI) by a user equipment in a wireless communication system, the method comprising:
measuring a first reference signal transmitted from antenna ports of a first subset among a plurality of antenna ports of a base station;
measuring a second reference signal transmitted from antenna ports of a second subset among the plurality of antenna ports; and
reporting CSI to the base station based on at least one of measurement of the first reference signal and measurement of the second reference signal,
wherein at least one of the plurality of antenna ports is contained in both the first subset and the second subset, and
wherein the reporting the CSI comprises:
performing singular value decomposition on channel information which is generated based on at least one of the measurement of the first reference signal and the measurement of the second reference signal;
quantizing a right singular matrix by comparing a phase of the right singular matrix according to the singular value decomposition and a phase of matrixes contained in a prescribed codebook with each other; and
transmitting at least one of the quantized right singular matrix and a left singular matrix according to the singular value decomposition to the base station.
2. The method of claim 1 , wherein the reporting the CSI comprises transmitting information on entire radio channels after all of the plurality of antenna ports are measured at least one time.
3. The method of claim 1 , wherein the reporting the CSI comprises:
transmitting information on a first partial channel corresponding to the antenna ports of the first subset based on a result of measuring the first reference signal; and
transmitting information on a second partial channel corresponding to the antenna ports of the second subset based on a result of measuring the second reference signal,
wherein the information on the first partial channel and the information on the second partial channel are reconfigured as entire channel information by the base station.
4. The method of claim 1 , wherein the reporting the CSI comprises:
matching information on a first partial channel based on the measurement of the first reference signal with information on a second partial channel based on the measurement of the second reference signal; and
transmitting a result of the matching to the base station.
5. The method of claim 1 , wherein the at least one antenna port contained in both the first subset and the second subset provides phase information to be a reference for matching information on a first partial channel based on the measurement of the first reference signal with information on a second partial channel based on the measurement of the second reference signal.
6. The method of claim 1 , further comprising:
receiving a subset configuration of the plurality of antenna ports and information on a reference signal transmission order of each of subsets within a single iteration interval.
7. The method of claim 6 , wherein averaging measurement results of reference signals transmitted by each of the subsets is prohibited in a same iteration interval.
8. The method of claim 1 , wherein the quantized right singular matrix corresponds to a matrix generated by accumulating the measurement result of the first reference signal and the measurement result of the second reference signal.
9. A user equipment for reporting channel state information (CSI) in a wireless communication system, the user equipment comprising:
a receiver configured to receive a first reference signal transmitted from antenna ports of a first subset among a plurality of antenna ports of a base station and configured to receive a second reference signal transmitted from antenna ports of a second subset among the plurality of antenna ports; and
a processor configured to respectively measure the received first reference signal and the second reference signal and configured to report CSI to the base station based on at least one of measurement of the first reference signal and measurement of the second reference signal,
wherein at least one of the plurality of antenna ports is contained in both the first subset and the second subset, and
wherein in reporting the CSI, the processor performs singular value decomposition on channel information which is generated based on at least one of the measurement of the first reference signal and the measurement of the second reference signal, quantizes a right singular matrix by comparing a phase of the right singular matrix according to the singular value decomposition and a phase of matrixes contained in a prescribed codebook with each other and reports at least one of the quantized right singular matrix and a left singular matrix according to the singular value decomposition to the base station.