Method for transmitting and receiving reference signal in wireless communication system and device therefor

A user equipment (UE) performing decoding in a wireless communication system, the UE comprising:

• a radio frequency (RF) unit transmitting and receiving a radio signal to and from the outside;
• and
• a processor functionally coupled with the RF unit,
• wherein the processor receives, from a base station (BS) a first demodulation reference signal (DMRS) and a second DMRS set according to a specific pattern via DMRS symbols,
• wherein each of the first DMRS and the second DMRS is transmitted on a specific antenna port and is located on the same time axis symbol as at least one other DMRS transmitted on the other antenna port, and a position of a time axis symbol of the second DMRS is determined according to a service type of transmitted data, and
• the processor decodes the data using at least one of the first DMRS and the second DMRS.