Method of transmitting/receiving channel state information reference signal in wireless communication system and device for same

1. A method of receiving a channel state information-reference signal (CSI-RS) of a user equipment (UE) in a wireless communication system, the method comprising:

receiving CSI-RS resource configuration related to a location of a CSI-RS resource element to which the CSI-RS is transmitted from a base station;

receiving the CSI-RS based on the CSI-RS resource configuration;

measuring a channel state based on the CSI-RS; and

reporting CSI of the measured channel state to the base station,

wherein the CSI-RS resource configuration includes a resource configuration information for mapping the CSI-RS resource element, subframe information associated with the offset and period of a subframe where the CSI-RS is transmitted, and antenna port information on a number of antenna ports where the CSI-RS is transmitted,

wherein the resource configuration information is indicated differently according to each subframe type in which the CSI-RS is transmitted and the CSI-RS is set to be alternatively transmitted one by one through a normal subframe and a special subframe within one radio frame,

the resource configuration information is determined based on a type of the subframe the CSI-RS resource configuration,

the CSI-RS is transmitted in a special subframe with a subframe number of 1 and a normal subframe with a subframe number of 6, and

the transmission period of the CSI-RS is set to 5 milliseconds.

2. The method of claim 1 ,

wherein, when the subframe where the CSI-RS is transmitted is the normal subframe, the resource configuration information indicates a location of a first CSI-RS resource element,

wherein, when the subframe where the CSI-RS is transmitted is the special subframe, the resource configuration information indicates a location of a second CSI-RS resource element, and

wherein the location of the second CSI-RS resource element is defined as a time-shifted form from the location of the first CSI-RS resource element.

3. The method of claim 2 , wherein the location of the second CSI-RS resource element is defined as a form time-shifted by a length of 4 OFDM symbols from the location of the first CSI-RS resource element.

4. The method of claim 1 , wherein the CSI-RS is transmitted only through a special subframe of a length equal to or greater than a predetermined length.

5. The method of claim 4 , wherein the CSI-RS is not transmitted at specific special subframe configurations of a plurality of special subframe configurations.

6. The method of claim 1 , wherein the normal subframe or the special subframe where the CSI-RS is transmitted corresponds to a subframe to which a normal cyclic prefix is applied.

7. A user equipment (UE) for receiving a channel state information-reference signal (CSI-RS) in a wireless communication system, the user equipment comprising:

a radio frequency (RF) unit configured to transmit and receive a wireless signal; and

a processor configured to control the RF unit,

wherein the user equipment is configured to,

receive CSI-RS resource configuration related to a location of a CSI-RS resource element to which the CSI-RS is transmitted,

receive the CSI-RS based on the CSI-RS resource configuration,

measure a channel state based on the CSI-RS, and

report CSI of the measured channel state to the base station,

wherein the CSI-RS resource configuration includes a resource configuration information for mapping the CSI-RS resource element, subframe information associated with the offset and period of a subframe where the CSI-RS is transmitted, and antenna port information on a number of antenna ports where the CSI-RS is transmitted,

wherein the resource configuration information is indicated differently according to each subframe type in which the CSI-RS is transmitted and the CSI-RS is set to be alternatively transmitted one by one through a normal subframe and a special subframe within one radio frame,

the resource configuration information is determined based on type of the subframe the CSI-RS resource configuration,

the CSI-RS is transmitted in a special subframe with a subframe number of 1 and a normal subframe with a subframe number of 6, and

the transmission period of the CSI-RS is set to 5 milliseconds.

8. The user equipment of claim 7 ,

wherein, when the subframe where the CSI-RS is transmitted is the normal subframe, the resource configuration information indicates a location of a first CSI-RS resource element, and

wherein, when the subframe where the CSI-RS is transmitted is the special subframe, the resource configuration information indicates a location of a second CSI-RS resource element,

wherein the location of the second CSI-RS resource element is defined as a time-shifted form from the location of the first CSI-RS resource element.

9. The user equipment of claim 8 , wherein the location of the second CSI-RS resource element is defined as a form time-shifted by a length of 4 OFDM symbols from the location of the first CSI-RS resource element.

10. The user equipment of claim 7 , wherein the CSI-RS is transmitted only through a special subframe of a length equal to or greater than a predetermined length.

11. The user equipment of claim 10 , wherein the CSI-RS is not transmitted at specific special subframe configurations of a plurality of special subframe configurations.

12. The user equipment of claim 7 , wherein the normal subframe or the special subframe where the CSI-RS is transmitted corresponds to a subframe to which a normal cyclic prefix is applied.

13. The method of claim 1 ,

wherein an uplink-downlink configuration is information indicating a rule related to uplink and downlink allocation for all subframes including the special subframe and the normal subframe.