Method for transmitting and receiving data in wireless communication system, and device therefor

A terminal configured to operate in a wireless communication system, the terminal comprising:

• a transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising;
• receiving, from a base station, configuration information related to a number of symbol positions for receiving additional demodulation reference signal (DMRS) on a physical downlink shared channel (PDSCH);
• receiving, from the base station, Downlink Control Information (DCI) for scheduling the PDSCH;
• determining, by the terminal, at least one symbol position for receiving the additional DMRS on the PDSCH, based on (i) the configuration information and (ii) a duration between (a) a first symbol of a slot related to the PDSCH and (b) a last symbol of the PDSCH in the slot related to the PDSCH;
• and
• receiving, from the base station, the additional DMRS on the at least one symbol position on the PDSCH,
• wherein determining the at least one symbol position for receiving the additional DMRS on the PDSCH based on (i) the configuration information and (ii) the duration between (a) the first symbol of the slot related to the PDSCH and (b) the last symbol of the PDSCH in the slot related to the PDSCH comprises:
• based on the configuration information including information for 3 symbol positions for the additional DMRS, and based on the duration between (a) the first symbol of the slot related to the PDSCH and (b) the last symbol of the PDSCH in the slot related to the PDSCH being one of 12 in symbols, 13 in symbols, or 14 in symbols:
• determining the at least one symbol position for the additional DMRS as equal to a symbol whose symbol index is 5, a symbol whose symbol index is 8, and a symbol whose symbol index is 11, in the slot;
• based on the configuration information including information for 3 symbol positions for the additional DMRS, and based on the duration between (a) the first symbol of the slot related to the PDSCH and (b) the last symbol of the PDSCH in the slot related to the PDSCH being one of 11 in symbols or 10 in symbols:
• determining the at least one symbol position for the additional DMRS as equal to a symbol whose symbol index is 6 and a symbol whose symbol index is 9, in the slot;
• and
• based on the configuration information including information for 3 symbol positions for the additional DMRS, and based on the duration between (a) the first symbol of the slot related to the PDSCH and (b) the last symbol of the PDSCH in the slot related to the PDSCH being 9 in symbols:
• determining the at least one symbol position for the additional DMRS as equal to a symbol whose symbol index is 7, in the slot.

A method performed by a base station operating in a wireless communication system, the method comprising:

• transmitting, to a terminal, configuration information related to a number of symbol positions for receiving additional demodulation reference signal (DMRS) on a physical downlink shared channel (PDSCH);
• transmitting, to the terminal, Downlink Control Information (DCI) for scheduling the PDSCH;
• mapping, by the base station, an additional DMRS to at least one symbol position for receiving the additional DMRS on the PDSCH,
• wherein the at least one symbol position to which the additional DMRS is mapped is determined based on (i) the configuration information and (ii) a duration between (a) a first symbol of a slot related to the PDSCH and (b) a last symbol of the PDSCH in the slot related to the PDSCH;
• and
• transmitting, to the terminal, the additional DMRS on the at least one symbol position on the PDSCH,
• wherein the at least one symbol position to which the additional DMRS is mapped is determined according to:
• based on the configuration information including information for 3 symbol positions for the additional DMRS, and based on the duration between (a) the first symbol of the slot related to the PDSCH and (b) the last symbol of the PDSCH in the slot related to the PDSCH being one of 12 in symbols, 13 in symbols, or 14 in symbols:
• the at least one symbol position for the additional DMRS is equal to a symbol whose symbol index is 5, a symbol whose symbol index is 8, and a symbol whose symbol index is 11, in the slot;
• based on the configuration information including information for 3 symbol positions for the additional DMRS, and based on the duration between (a) the first symbol of the slot related to the PDSCH and (b) the last symbol of the PDSCH in the slot related to the PDSCH being one of 11 in symbols or 10 in symbols:
• the at least one symbol position for the additional DMRS is equal to a symbol whose symbol index is 6 and a symbol whose symbol index is 9, in the slot;
• and
• based on the configuration information including information for 3 symbol positions for the additional DMRS, and based on the duration between (a) the first symbol of the slot related to the PDSCH and (b) the last symbol of the PDSCH in the slot related to the PDSCH being 9 in symbols:
• the at least one symbol position for the additional DMRS is equal to a symbol whose symbol index is 7, in the slot.