Terminal, method whereby terminal receives channel status information reference signals, base station, and method whereby base station transmits channel status information reference signals

1. A user equipment for receiving a Channel Status Information Reference Signal (CSI-RS) transmitted by a base station, the user equipment comprising:

a receiver configured to receive, from the base station, CSI-RS configuration information including information on a number of CSI-RS antenna ports for a horizontal antenna in an antenna array of the base station, and information indicating a CSI-RS pattern used for a CSI-RS for the horizontal antenna in a particular subframe; and

a controller configured to extract a number of CSI-RS antenna ports for a vertical antenna and a CSI-RS pattern for the vertical antenna, based on the number of the CSI-RS antenna ports for the horizontal antenna and the information indicating the CSI-RS pattern for the horizontal antenna, when it is determined that a CSI-RS for the vertical antenna is transmitted,

wherein the CSI-RS configuration information comprises information of 1 bit or 3 bits which indicates whether the CSI-RS for the vertical antenna is used, and

wherein the controller determines a number of antenna ports used to transmit the CSI-RS based on the information of 1 bit or 3 bits which indicated whether the CSI-RS for the vertical antenna is used and the information on the number of the CSI-RS antenna ports for the horizontal antenna.

2. The user equipment as claimed in claim 1 , wherein the number of the CSI-RS antenna ports for the vertical antenna is determined based on the number of the CSI-RS antenna ports for the horizontal antenna.

3. The user equipment as claimed in claim 1 , wherein the CSI-RS configuration information further comprises information indicating a relation between the CSI-RS pattern for the vertical antenna and the CSI-RS pattern for the horizontal antenna, and wherein the CSI-RS pattern for the vertical antenna is determined based on the information indicating the relation and the information indicating the CSI-RS pattern for the horizontal antenna.

4. A method in which a user equipment receives a Channel Status Information Reference Signal (CSI-RS) transmitted by a base station, the method comprising:

receiving, from the base station, CSI-RS configuration information including information on a number of CSI-RS antenna ports for a horizontal antenna in an antenna array of the base station, information of 1 bit or 3 bits which indicates whether the CSI-RS for the vertical antenna is used, and information indicating a CSI-RS pattern used for the CSI-RS for the horizontal antenna in a particular subframe; and

extracting a number of CSI-RS antenna ports for a vertical antenna and a CSI-RS pattern for the vertical antenna, based on the number of the CSI-RS antenna ports for the horizontal antenna and the information indicating the CSI-RS pattern for the horizontal antenna, when it is determined that a CSI-RS for the vertical antenna is transmitted; and

determining a number of antenna ports used to transmit the CSI-RS based on the information of 1 bit or 3 bits which indicates whether the CSI-RS for the vertical antenna is used and the information on the number of the CSI-RS antenna ports for the horizontal antenna.

5. The method as claimed in claim 4 , wherein the number of the CSI-RS antenna ports for the vertical antenna is determined based on the number of the CSI-RS antenna ports for the horizontal antenna.

6. The method as claimed in claim 4 , wherein the CSI-RS configuration information further comprises information indicating a relation between the CSI-RS pattern for the vertical antenna and the CSI-RS pattern for the horizontal antenna, and

wherein the CSI-RS pattern for the vertical antenna is determined based on the information indicating the relation and the information indicating the CSI-RS pattern for the horizontal antenna.

7. A base station for transmitting a Channel Status Information Reference Signal (CSI-RS), the base station comprising:

a transmitter configured to transmit CSI-RS configuration information including information on a number of CSI-RS antenna ports for a horizontal antenna, and information indicating a CSI-RS pattern used for a CSI-RS for the horizontal antenna in a particular subframe; and

an antenna array configured to transmit the CSI-RS for the horizontal antenna and a CSI-RS for a vertical antenna,

wherein a number of CSI-RS antenna ports for the vertical antenna and a CSI-RS pattern for the vertical antenna are determined based on the number of the CSI-RS antenna ports for the horizontal antenna and the information indicating the CSI-RS pattern for the horizontal antenna, when the CSI-RS for the vertical antenna is transmitted,

wherein the CSI-RS configuration information comprises information of 1 bit or 3 bits which indicates whether the CSI-RS for the vertical antenna is used, and

wherein a number of antenna ports used to transmit the CSI-RS is determined based on the information of 1 bit or 3 bits which indicated whether the CSI-RS for the vertical antenna is used and the information on the number of the CSI-RS antenna ports for the horizontal antenna.

8. The base station as claimed in claim 7 , wherein the number of the CSI-RS antenna ports for the vertical antenna is determined based on the number of the CSI-RS antenna ports for the horizontal antenna.

9. The base station as claimed in claim 7 , wherein the CSI-RS configuration information further comprises information indicating a relation between the CSI-RS pattern for the vertical antenna and the CSI-RS pattern for the horizontal antenna, and

wherein the CSI-RS pattern for the vertical antenna is determined based on the information indicating the relation and the information indicating the CSI-RS pattern for the horizontal antenna.

10. A method for transmitting a Channel Status Information Reference Signal (CSI-RS) by a base station, the method comprising:

transmitting CSI-RS configuration information including information on a number of CSI-RS antenna ports for a horizontal antenna in an antenna array of the base station, and information indicating a CSI-RS pattern used for a CSI-RS for the horizontal antenna in a particular subframe; and

transmitting the CSI-RS for the horizontal antenna, a CSI-RS for a vertical antenna, or both,

wherein a number of CSI-RS antenna ports for the vertical antenna and a CSI-RS pattern for the vertical antenna are determined based on the number of the CSI-RS antenna ports for the horizontal antenna and the information indicating the CSI-RS pattern for the horizontal antenna, when the CSI-RS for the vertical antenna is transmitted,

wherein the CSI-RS configuration information comprises information of 1 bit or 3 bits which indicates whether the CSI-RS for the vertical antenna is used, and

wherein a number of antenna ports used to transmit the CSI-RS is determined based on the information of 1 bit or 3 bits which indicated whether the CSI-RS for the vertical antenna is used and the information on the number of the CSI-RS antenna ports for the horizontal antenna.

11. The method as claimed in claim 10 , wherein the number of the CSI-RS antenna ports for the vertical antenna is determined based the number of the CSI-RS antenna ports for the horizontal antenna.

12. The method as claimed in claim 10 , wherein the CSI-RS configuration information further comprises information indicating a relation between the CSI-RS pattern for the vertical antenna and the CSI-RS pattern for the horizontal antenna, and

wherein the CSI-RS pattern for the vertical antenna is determined based on the information indicating the relation and the information indicating the CSI-RS pattern for the horizontal antenna.