Method and apparatus for transmitting and receiving reference signals in a wireless communication system

A User Equipment (UE) for transmitting and receiving a Reference Signal (RS) in a wireless communication system, comprising:

• a radio frequency (RF) unit for transmitting and receiving a radio signal;
• and
• a processor functionally connected with the RF unit,
• wherein the processor is configured to perform:
• receiving, from a base station, configuration information including a maximum number value related to a maximum number of symbols to which a Dedicated Demodulation Reference Signal is mapped and a configuration type of the Dedicated Demodulation Reference Signal related to (i) a time and frequency mapping pattern of the Dedicated Demodulation Reference Signal to physical resources and (ii) antenna ports configuration used to transmit the Dedicated Demodulation Reference Signal through a higher layer signaling;
• receiving, from the base station, a Physical Downlink Control Channel (PDCCH) including Downlink Control Information (DCI) in relation to a configuration of the Dedicated Demodulation Reference Signal;
• and
• receiving, from the base station, the Dedicated Demodulation Reference Signal and a Physical Downlink Shared Channel(PDSCH) based on the PDCCH,
• wherein the DCI includes a DCI field for receiving the Dedicated Demodulation Reference Signal,
• wherein configurations related to receiving the Dedicated Demodulation Reference Signal are configured differently based on the maximum value number and the configuration type, and
• wherein the DCI field is configured based on the configurations differently configured based on the value of the maximum number value and the configuration type.

A method for transmitting a Reference Signal (RS) performed by a base station in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), configuration information including a maximum number value related to a maximum number of symbols to which a Dedicated Demodulation Reference Signal is mapped and a configuration type of the Dedicated Demodulation Reference Signal related to (i) a time and frequency mapping pattern of the Dedicated Demodulation Reference Signal to physical resources and (ii) antenna ports configuration used to transmit the Dedicated Demodulation Reference Signal through a higher layer signaling;
• transmitting, to the UE, a Physical Downlink Control Channel (PDCCH) including Downlink Control Information (DCI) in relation to a configuration of the Dedicated Demodulation Reference Signal;
• and
• transmitting, to the UE, the Dedicated Demodulation Reference Signal and a Physical Downlink Shared Channel (PDSCH) based on the PDCCH,
• wherein the DCI includes a DCI field for receiving the Dedicated Demodulation Reference Signal,
• wherein configurations related to receiving the Dedicated Demodulation Reference Signal are configured differently based on the maximum number value and the configuration type, and
• wherein the DCI field is configured based on the configurations differently configured based on the value of the maximum number value and the configuration type.