Apparatus and method for beam management in wireless communication system
A pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4 th -Generation (4G) communication system, such as long-term evolution (LTE), is disclosed. The system includes an apparatus of a base station. The apparatus may include: at least one transceiver, and at least one processor connected to the at least one transceiver, where the at least one processor is configured to transmit to a terminal, configuration information of reference signals for beam management regarding a transmit (Tx) beam of the BS or a receive (Rx) beam of the terminal, transmit the reference signals to the terminal, and the configuration information comprises information related to a number of repetitions of the reference signals.
1. A method performed by a user equipment (UE), the method comprising:
receiving, from a base station, 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, receiving, from the base station, 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, receiving, from the base station, an aperiodic CSI-RS based on the second CSI-RS configuration.
2. The method of claim 1 ,
wherein the MAC CE includes an identifier of the CSI-RS configuration, and
wherein the CSI-RS configuration includes information on the periodicity for the at least one CSI-RS.
3. The method of claim 1 ,
wherein the CSI-RS configuration includes resource information on a CSI-RS resource, and
wherein the resource information includes:
a number of antenna ports for the CSI-RS resource,
a start orthogonal frequency division multiplexing (OFDM) symbol number within a resource block used for CSI-RS transmission, and
frequency resources for the CSI-RS resource.
4. The method of claim 1 , further comprising:
receiving, from the base station, a MAC CE for deactivating the CSI-RS configuration,
wherein the at least one CSI-RS is received according to the periodicity between the activation of the first CSI-RS configuration and the deactivation of the first CSI-RS configuration.
5. The method of claim 1 , further comprising:
receiving, from the base station, information for configuring the UE to report a beam identifier (ID) and a reference signal received power (RSRP),
wherein the CSI-RS configuration includes repetition information for indicating that CSI-RSs are transmitted with a same transmit beam of the base station and are transmitted on different orthogonal frequency division multiplexing (OFDM) symbols.
6. 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.
7. The method of claim 6 ,
wherein the MAC CE includes an identifier of the CSI-RS configuration, and
wherein the CSI-RS configuration includes information on the periodicity for the at least one CSI-RS.
8. The method of claim 6 ,
wherein the CSI-RS configuration includes resource information on a CSI-RS resource, and
wherein the resource information includes:
a number of antenna ports for the CSI-RS resource,
a start orthogonal frequency division multiplexing (OFDM) symbol number within a resource block used for CSI-RS transmission, and
frequency resources for the CSI-RS resource.
9. The method of claim 6 , further comprising:
transmitting, to the UE, a MAC CE for deactivating the CSI-RS configuration,
wherein the at least one CSI-RS is transmitted according to the periodicity between the activation of the first CSI-RS configuration and the deactivation of the first CSI-RS configuration.
10. The method of claim 6 , further comprising:
transmitting, to the UE, information for configuring the UE to report a beam identifier (ID) and a reference signal received power (RSRP),
wherein the CSI-RS configuration includes repetition information for indicating that CSI-RSs are transmitted with a same transmit beam of the base station and are transmitted on different orthogonal frequency division multiplexing (OFDM) symbols.
11. 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.
12. The UE of claim 11 ,
wherein the MAC CE includes an identifier of the CSI-RS configuration, and
wherein the CSI-RS configuration includes information on the periodicity for the at least one CSI-RS.
13. The UE of claim 11 ,
wherein the CSI-RS configuration includes resource information on a CSI-RS resource, and
wherein the resource information includes:
a number of antenna ports for the CSI-RS resource,
a start orthogonal frequency division multiplexing (OFDM) symbol number within a resource block used for CSI-RS transmission, and
frequency resources for the CSI-RS resource.
14. The UE of claim 11 ,
wherein the at least one processor is further configured to receive, from the base station via the at least one transceiver, a MAC CE for deactivating the CSI-RS configuration, and
wherein the at least one CSI-RS is received according to the periodicity between the activation of the first CSI-RS configuration and the deactivation of the first CSI-RS configuration.
15. The UE of claim 11 ,
wherein the at least one processor is further configured to receive, from the base station via the at least one transceiver, information for configuring the UE to report a beam identifier (ID) and a reference signal received power (RSRP), and
wherein the CSI-RS configuration includes repetition information for indicating that CSI-RSs are transmitted with a same transmit beam of the base station and are transmitted on different orthogonal frequency division multiplexing (OFDM) symbols.
16. 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.
17. The base station of claim 16 ,
wherein the MAC CE includes an identifier of the CSI-RS configuration, and
wherein the CSI-RS configuration includes information on the periodicity for the at least one CSI-RS.
18. The base station of claim 16 ,
wherein the CSI-RS configuration includes resource information on a CSI-RS resource, and
wherein the resource information includes:
a number of antenna ports for the CSI-RS resource,
a start orthogonal frequency division multiplexing (OFDM) symbol number within a resource block used for CSI-RS transmission, and
frequency resources for the CSI-RS resource.
19. The base station of claim 16 ,
wherein the at least one processor is further configured to transmit, to the UE via the at least one transceiver, a MAC CE for deactivating the CSI-RS configuration, and
wherein the at least one CSI-RS is received according to the periodicity between the activation of the first CSI-RS configuration and the deactivation of the first CSI-RS configuration.
20. The base station of claim 16 ,
wherein the at least one processor is further configured to transmit, to the UE via the at least one transceiver, information for configuring the UE to report a beam identifier (ID) and a reference signal received power (RSRP), and
wherein the CSI-RS configuration includes repetition information for indicating that CSI-RSs are transmitted with a same transmit beam of the base station and are transmitted on different orthogonal frequency division multiplexing (OFDM) symbols.