Method and device for transmitting channel state information in wireless communication system
The present invention relates to a wireless communication system. A method for transmitting channel state information (CSI) by a user equipment in a wireless communication system includes receiving a CSI-reference signal (CSI-RS), determining overhead of a common reference signal (CRS) resource element based on the same antenna port number as an antenna port number associated with the CSI-RS, and transmitting the CSI calculated based on the CSI-RS and the overhead of the CRS resource element.
1. A method for transmitting Channel State Information (CSI) in a wireless access system, the method performed by a user equipment and comprising:
receiving a Channel State Information-Reference Signal (CSI-RS);
assuming an overhead of Common Reference Signal Resource Elements (CRS REs) to be based on a number of antenna ports which is the same as a number of antenna ports associated with the CSI-RS; and
transmitting the CSI based on the assumed overhead of CRS REs.
2. The method of claim 1 , further comprising:
receiving CSI configuration information for reporting the CSI.
3. The method of claim 2 , wherein the CSI configuration information is configured to report a channel quality indicator (CQI) without reporting a precoding matrix indicator (PMI) and a rank indicator (RI).
4. The method of claim 2 , wherein the CSI configuration information is transmitted using Radio Resource Control (RRC) signaling.
5. The method of claim 1 , wherein the number of antenna ports associated with the CSI-RS is configured less than or equal to 4.
6. The method of claim 1 , wherein the CSI indicates a channel state in a Time Division Multiplexing (TDD) system of satisfying a channel reciprocity.
7. A method for receiving Channel State Information (CSI) in a wireless access system, the method performed by a base station and comprising:
transmitting a Channel State Information-Reference Signal (CSI-RS); and
receiving the CSI generated based on an overhead of Common Reference Signal Resource Elements (CRS REs),
wherein the overhead of the CRS REs is assumed to be based on a number of antenna ports which is the same as a number of antenna ports associated with the CSI-RS.
8. The method of claim 7 , further comprising:
transmitting CSI configuration information for reporting the CSI.
9. The method of claim 8 , wherein the CSI configuration information is configured to report a channel quality indicator (CQI) without reporting a precoding matrix indicator (PMI) and a rank indicator (RI).
10. The method of claim 8 , wherein the CSI configuration information is transmitted using Radio Resource Control (RRC) signaling.
11. The method of claim 7 , wherein the number of antenna ports associated with the CSI-RS is configured less than or equal to 4.
12. The method of claim 7 , wherein the CSI indicates a channel state in a Time Division Multiplexing (TDD) system of satisfying a channel reciprocity.
13. A user equipment for transmitting Channel State Information (CSI) in a wireless access system, the user equipment comprising:
a radio frequency (RF) unit; and
a processor configured to:
receive a Channel State Information-Reference Signal (CSI-RS);
assume an overhead of Common Reference Signal Resource Elements (CRS REs) to be based on a number of antenna ports which is the same as a number of antenna ports associated with the CSI-RS; and
transmit the CSI based on the assumed overhead of CRS REs.
14. A base station for receiving Channel State Information (CSI) in a wireless access system, the base station comprising:
a radio frequency (RF) unit; and
a processor configured to:
transmit a Channel State Information-Reference Signal (CSI-RS); and
receive the CSI generated based on an overhead of Common Reference Signal Resource Elements (CRS REs),
wherein the overhead of the CRS REs is assumed to be based on a number of antenna ports which is the same as a number of antenna ports associated with the CSI-RS.