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

A user equipment (UE) comprising:

• at least one transceiver for transmitting and receiving a wireless signal;
• and
• at least one processor for controlling the at least one transceiver,
• wherein the at least one processor configured to:
• receive, from a base station, configuration information related to a downlink reference signal;
• receive, from the base station, downlink control information for scheduling a physical downlink channel;
• and
• receive, from the base station, the physical downlink channel and a downlink reference signal for the physical downlink channel based on the downlink control information,
• wherein i) a first pattern and ii) a second pattern having less density than the first pattern in a frequency domain are configured by the configuration information,
• wherein based on whether one or more antenna ports indicated by the downlink control information are associated with single-user transmission or multi-user transmission, a pattern of the downlink reference signal is determined among the first pattern and the second pattern, and
• wherein the second pattern is configured based on a specific sub-multiplexing group among a plurality of sub-multiplexing groups defined in a single multiplexing group for the first pattern.

A base station comprising:

• at least one transceiver for transmitting and receiving a wireless signal;
• and
• at least one processor for controlling the at least one transceiver,
• wherein the at least one processor configured to:
• transmit, to a user equipment (UE), configuration information related to a downlink reference signal;
• transmit, to the UE, downlink control information for scheduling a physical downlink channel;
• and
• transmit, to the UE, the physical downlink channel and a downlink reference signal for the physical downlink channel based on the downlink control information,
• wherein i) a first pattern and ii) a second pattern having less density than the first pattern in a frequency domain are configured by the configuration information, and
• wherein based on whether one or more antenna ports indicated by the downlink control information are associated with single-user transmission or multi-user transmission, a pattern of the downlink reference signal is determined among the first pattern and the second pattern, and
• wherein the second pattern is configured based on a specific sub-multiplexing group among a plurality of sub-multiplexing groups defined in a single multiplexing group for the first DM-RS pattern.