Apparatus and method for beam management in wireless communication system

A method performed by a base station (BS), the method comprising:

• transmitting, to a user equipment (UE), a radio resource control (RRC) message including at least one of:
• first information on one or more first channel state information-reference signal (CSI-RS) configurations associated with a semi-persistent CSI-RS, or
• second information on one or more second CSI-RS configurations associated with an aperiodic CSI-RS;
• in case that a medium access control (MAC) control element (CE) for activating a first CSI-RS configuration from the one or more CSI-RS configurations is transmitted, transmitting, to the UE, at least one CSI-RS using a periodicity based on the first CSI-RS configuration;
• and
• in case that downlink control information (DCI) for indicating a second CSI-RS configuration from the one or more second CSI-RS configurations is transmitted, transmitting, to the UE, an aperiodic CSI-RS based on the second CSI-RS configuration.

A user equipment (UE) comprising:

• at least one transceiver;
• and
• at least one processor configured to:
• receive, from a base station via the at least one transceiver, a radio resource control (RRC) message including at least one of:
• first information on one or more first channel state information-reference signal (CSI-RS) configurations associated with a semi-persistent CSI-RS, or
• second information on one or more second CSI-RS configurations associated with an aperiodic CSI-RS,
• in case that a medium access control (MAC) control element (CE) for activating a first CSI-RS configuration from the one or more first CSI-RS configurations is received, receive, from the base station via the at least one transceiver, at least one CSI-RS using a periodicity based on the first CSI-RS configuration, and
• in case that downlink control information (DCI) for indicating a second CSI-RS configuration from the one or more second CSI-RS configurations is received, receive, from the base station via the at least one transceiver, an aperiodic CSI-RS based on the second CSI-RS configuration.

A base station comprising:

• at least one transceiver;
• and
• at least one processor configured to:
• transmit, to a user equipment (UE) via the at least one transceiver, a radio resource control (RRC) message including at least one of:
• first information on one or more first channel state information-reference signal (CSI-RS) configurations associated with a semi-persistent CSI-RS, or
• second information on one or more second CSI-RS configurations associated with an aperiodic CSI-RS,
• in case that a medium access control (MAC) control element (CE) for activating a first CSI-RS configuration from the one or more first CSI-RS configurations is transmitted, transmit, to the UE via the at least one transceiver, at least one CSI-RS using a periodicity based on the first CSI-RS configuration, and
• in case that downlink control information (DCI) for indicating a second CSI-RS configuration from the one or more second CSI-RS configurations is transmitted, transmit, to the UE, an aperiodic CSI-RS based on the second CSI-RS configuration.