Method and device for setting plurality of DMRS structures in wireless cellular communication system

A base station in a wireless communication system, comprising:

• a transceiver;
• and
• a controller configured to:
• transmit, to a terminal via the transceiver, first information associated with a number of a symbol for a demodulation reference signal (DMRS) and second information associated with an additional DMRS position, wherein the number of the symbol for the DMRS is one or two,
• identify a symbol position of the DMRS based on first information, the second information, and a start of a slot which is identified between the start of the slot and a start of a scheduled physical downlink shared channel (PDSCH), and
• transmit, to the terminal, the DMRS on the identified symbol position of the DMRS.

A method by a terminal in a wireless communication system, the method comprising:

• receiving, from a base station, first information associated with a number of a symbol for a demodulation reference signal (DMRS) and second information associated with an additional DMRS position, wherein the number of the symbol for the DMRS is one or two;
• identifying symbol position of the DMRS based on the first information, the second information, and a start of a slot which is identified between the start of the slot and a start of a scheduled physical downlink shared channel (PDSCH);
• and
• receiving, from the base station, the DMRS on the identified symbol position of the DMRS.

A terminal in a wireless communication system, comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from a base station, via the transceiver, first information associated with a number of a symbol for a demodulation reference signal (DMRS) and second information associated with an additional DMRS position, wherein the number of the symbol for the DMRS is one or two,
• identify symbol position of the DMRS based on the first information, the second information, and a start of a slot which is identified between the start of the slot and a start of a scheduled physical downlink shared channel (PDSCH), and
• receive, from the base station, the DMRS on the identified symbol position of the DMRS.