Method and apparatus for downlink control information design for network coordination

A method for receiving a demodulation reference signal (DMRS) performed by a terminal in a communication system, the method comprising:

• receiving, from a base station, DMRS configuration information, the DMRS configuration information including information indicating a DMRS pattern and information associated with an extended DMRS;
• receiving, from the base station, downlink control information (DCI) for downlink data;
• and
• receiving, from the base station, the downlink data and the DMRS based on the DMRS configuration information,
• wherein the DMRS is mapped on DMRS resource elements based on one or more unit DMRSs,
• wherein a number of a plurality of DMRS subcarriers in a single orthogonal frequency division multiplexing (OFDM) symbol of a unit DMRS is determined based on the indicated DMRS pattern between a first DMRS pattern and a second DMRS pattern,
• wherein in case of the information indicating the DMRS pattern indicates the first DMRS pattern, the first DMRS pattern for mapping up to 8 DMRS antenna ports is used, and
• wherein in case of the information indicating the DMRS pattern indicates the second DMRS pattern, the second DMRS pattern for mapping up to 12 DMRS antenna ports is used.

A base station for transmitting a demodulation reference signal (DMRS) in a communication system, the base station comprising:

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to control the transceiver to:
• transmit, to a terminal via the transceiver, DMRS configuration information, the DMRS configuration information including information indicating a DMRS pattern and information associated with an extended DMRS,
• transmit, to the terminal, downlink control information (DCI) for downlink data, and
• transmit, to the terminal, the downlink data and the DMRS according to the DMRS configuration information,
• wherein the DMRS is mapped on DMRS resource elements based on one or more unit DMRSs,
• wherein a number of a plurality of DMRS subcarriers in a single orthogonal frequency division multiplexing (OFDM) symbol of a unit DMRS for an antenna port is determined based on the indicated DMRS pattern between a first DMRS pattern and a second DMRS pattern,
• wherein in case of the information indicating the DMRS pattern indicates the first DMRS pattern, the first DMRS pattern for mapping up to 8 DMRS antenna ports is used, and
• wherein in case of the information indicating the DMRS pattern indicates the second DMRS pattern, the second DMRS pattern for mapping up to 12 DMRS antenna ports is used.

A terminal for receiving a demodulation reference signal (DMRS) in a communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to control the transceiver to:
• receive, from a base station via the transceiver, DMRS configuration information, the DMRS configuration information including information indicating a DMRS pattern and information associated with an extended DMRS,
• receive, from the base station, downlink control information (DCI) for downlink data, and
• receive, from the base station, the downlink data and the DMRS based on the DMRS configuration information,
• wherein the DMRS is mapped on DMRS resource elements based on one or more unit DMRSs,
• wherein a number of a plurality of DMRS subcarriers in a single orthogonal frequency division multiplexing (OFDM symbol of a unit DMRS is determined based on the indicated DMRS pattern between a first DMRS pattern and a second DMRS pattern,
• wherein in case of the information indicating the DMRS pattern indicates the first DMRS pattern, the first DMRS pattern for mapping up to 8 DMRS antenna ports is used, and
• wherein in case of the information indicating the DMRS pattern indicates the second DMRS pattern, the second DMRS pattern for mapping up to 12 DMRS antenna ports is used.