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

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 information about a CSI-RS resource location having the CSI-RS mapped thereto and receive the CSI-RS through a CSI-RS resource at a location determined based on the CSI-RS resource information,
• wherein the CSI-RS resource information includes an index value indicating a location of a CSI-RS resource element where the CSI-RS is transmitted, a period and offset information of a subframe where the CSI-RS is transmitted, and information on a number of antenna ports where the CSI-RS is transmitted,
• wherein, when the index value indicates locations of different CSI-RS resource elements by types of the subframe where the CSI-RS is transmitted and the CSI-RS is set to be transmitted alternately through a normal subframe and a special subframe within one wireless frame, the location of the CSI-RS resource is determined in additional consideration of a type of the subframe in addition to the CSI-RS resource information, and
• wherein a case that the CSI-RS is set to be transmitted alternately through the normal subframe and the special subframe in the one wireless frame is a case that a uplink-downlink configuration is set to 3, 4 or 5, and a transmission period of the CSI-RS is set to 5 ms.