Method for receiving or transmitting downlink signal and apparatus for same

A user equipment (UE) configured to receive a downlink signal in a wireless communication system comprising:

• a radio frequency (RF) unit;
• and
• a processor configured to control the RF unit,
• wherein the processor is configured to receive a candidate seed list and downlink control information (DCI) for generating a sequence of a downlink demodulation reference signal (DM RS) from a base station (BS) through the RF unit, select a seed value from the candidate seed list based on seed value indication information contained in the downlink control information (DCI), and generate the sequence of the downlink demodulation reference signal (DM RS) using the selected seed value,
• wherein the candidate seed list includes a plurality of hybrid automatic repeat request (HARQ) process identifiers and virtual cell identifiers associated with the plurality of HARQ process identifiers.

A base station (BS) configured to transmit a downlink signal in a wireless communication system comprising:

• a radio frequency (RF) unit;
• and
• a processor configured to control the RF unit,
• wherein the processor is configured to transmit a candidate seed list and downlink control information (DCI) for generating a sequence of a downlink demodulation reference signal (DM RS) to a user equipment (UE) through the RF unit,
• wherein the user equipment (UE) is configured to select a seed value from the candidate seed list based on seed value indication information contained in the downlink control information (DCI), and generate the sequence of the downlink demodulation reference signal (DM RS) using the selected seed value,
• wherein the candidate seed list includes a plurality of hybrid automatic repeat request (HARQ) process identifiers and virtual cell identifiers associated with the plurality of HARQ process identifiers.