Method and apparatus for channel state information reference signal (CSI-RS)

A terminal of transmitting channel state information (CSI) in a wireless communication system, the terminal comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to:
• receive, from a base station, first information for configuring a set of CSI reference signal (CSI-RS) resources,
• receive, from the base station, second information for selecting at least one CSI-RS resource from the set of CSI-RS resources,
• receive, from the base station, downlink control information (DCI) requesting a report of a CSI, the DCI indicating a CSI-RS resource among the at least one CSI-RS resource,
• calculate a CSI parameter based on a CSI-RS corresponding to the indicated CSI-RS resource, and
• transmit, to the base station, the CSI based on the calculated CSI parameter.

A method of receiving channel state information (CSI) by a base station in a wireless communication system, the method comprising:

• transmitting, to a terminal, first information for configuring a set of CSI reference signal (CSI-RS) resources;
• transmitting, to the terminal, second information for selecting at least one CSI-RS resource from the set of CSI-RS resources;
• transmitting, to the terminal, downlink control information (DCI) requesting a report of a CSI, the DCI indicating a CSI-RS resource among the at least one CSI-RS resources;
• and
• receiving, from the terminal, a CSI calculated based on a CSI-RS corresponding to the indicated CSI-RS resource.

A base station of receiving channel state information (CSI) in a wireless communication system, the base station comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to:
• transmit, to a terminal, first information for configuring a set of CSI reference signal (CSI-RS) resources,
• transmit, to the terminal, second information for selecting at least one CSI-RS resource from the set of CSI-RS resources,
• transmit, to the terminal, downlink control information (DCI) requesting a report of a CSI, the DCI indicating a CSI-RS resource among the at least one CSI-RS resource, and
• receive, from the terminal, a CSI calculated based on a CSI-RS corresponding to the indicated CSI-RS resource.