Reference signal measurement method and apparatus for use in mobile communication system

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

• a transceiver;
• and
• a controller configured to:
• receive, from a base station via the transceiver, a radio resource control (RRC) message including a channel state information-reference signal (CSI-RS) configuration for beamformed CSI-RS, and a first indicator indicating whether a channel measurement restriction is supported,
• measure at least one non-zero power CSI-RS for a downlink channel state based on the CSI-RS configuration for the beamformed CSI-RS,
• obtain first channel state information (CSI) for the downlink channel state measured in one subframe before reporting the first CSI based on a measurement restriction window, in case that the first indicator indicates that the channel measurement restriction is supported, wherein the first indicator is used to restrict the at least one non-zero power CSI-RS used to obtain the first CSI based on the CSI-RS configuration, and
• report, to the base station via the transceiver, the first CSI for the downlink channel state.

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

• transmitting a radio resource control (RRC) message including a channel state information-reference signal (CSI-RS) configuration for beamformed CSI-RS, and a first indicator indicating whether a channel measurement restriction is supported to a terminal;
• transmitting at least one non-zero power CSI-RS for a downlink channel state to the terminal based on the CSI-RS configuration for the beamformed CSI-RS;
• and
• receiving, from the terminal, first channel state information (CSI) for the downlink channel state,
• wherein the first CSI measured in one subframe before reporting the first CSI is obtained based on a measurement restriction window, in case that the first indicator indicates that the channel measurement restriction is supported, and
• wherein the first indicator is used to restrict the at least one non-zero power CSI-RS used to obtain the first CSI based on the CSI-RS configuration.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• a controller configured to:
• transmit, to a terminal via the transceiver, a radio resource control (RRC) message including a channel state information-reference signal (CSI-RS) configuration for beamformed CSI-RS, and a first indicator indicating whether a channel measurement restriction is supported,
• transmit, to the terminal via the transceiver, at least one non-zero power CSI-RS for a downlink channel state based on the CSI-RS configuration for the beamformed CSI-RS, and
• receive, from the terminal via the transceiver, first channel state information (CSI) for the downlink channel state,
• wherein the first CSI measured in one subframe before reporting the first CSI is obtained based on a measurement restriction window, in case that the first indicator indicates that the channel measurement restriction is supported, and
• wherein the first indicator is used to restrict the at least one non-zero power CSI-RS used to obtain the first CSI based on the CSI-RS configuration.