Method and apparatus for beam indication in a multi-beam system
An apparatus for beam management includes a transceiver configured to receive configuration information for one or more transmission configuration indicator (TCI) states and corresponding channels, receive one or more TCI state identifiers (IDs) on a channel for conveying TCI state IDs from among the corresponding channels, and transmit an acknowledgement message in response to the reception of the one or more TCI state IDs. The apparatus further includes a processor configured to determine, based on the one or more TCI state IDs, TCI states for data and control channels, respectively, from among the corresponding channels, and update spatial filters for the data and control channels based on the determined TCI states for the data channels and the control channels, respectively. The transceiver is further configured to receive the data channels and the control channels based on the updated spatial filters for the data and the control channels, respectively.
1. A user equipment (UE) in a wireless communication system, the UE comprising:
a processor; and
a transceiver operably coupled to the processor, the transceiver configured to:
receive, from a base station, configuration information for one or more transmission configuration indicator (TCI) states,
receive, from the base station, downlink control information (DCI) indicating a TCI state from among the one or more TCI states,
transmit, to the base station, hybrid automatic repeat request-acknowledgement (HARQ-ACK) information on a physical uplink control channel (PUCCH) in response to the DCI or in response to a physical downlink shared channel (PDSCH) scheduled by the DCI, and
perform reception of a downlink signal or transmission of an uplink signal, based on the indicated TCI state,
wherein, based on determination that the indicated TCI state is different from a previously indicated TCI state, the indicated TCI state is applied after a beam application time from an end time of transmitting the HARQ-ACK information on the PUCCH,
wherein the beam application time is configured by a radio resource control (RRC) signaling, and wherein, in case that the DCI does not include a downlink assignment, the HARQ-ACK information transmitted to the base station on the PUCCH corresponds to the DCI indicating the TCI state without the downlink assignment.
2. The UE of claim 1 , wherein, in case that the DCI includes a downlink assignment, the HARQ-ACK information transmitted to the base station on the PUCCH corresponds to the PDSCH scheduled by the DCI indicating the TCI state.
3. The UE of claim 1 , wherein:
the transceiver is further configured to receive, from the base station, a medium access control (MAC) control element (CE) for one or more activated TCI states from among the one or more TCI states, and
the DCI indicates the TCI state from among one or more activated TCI states.
4. A base station in a wireless communication system, the base station comprising:
a processor; and
a transceiver operably coupled to the processor, the transceiver configured to:
transmit, to a user equipment (UE), configuration information for one or more transmission configuration indicator (TCI) states,
transmit, to the UE, downlink control information (DCI) indicating a TCI state from among the one or more TCI states,
receive, from the UE, hybrid automatic repeat request-acknowledgement (HARQ-ACK) information on a physical uplink control channel (PUCCH) in response to the DCI or in response to a physical downlink shared channel (PDSCH) scheduled by the DCI, and
perform transmission of a downlink signal or reception of an uplink signal, based on the indicated TCI state, and
wherein, based on determination that the indicated TCI state is different from a previously indicated TCI state, the indicated TCI state is applied after a beam application time from an end time of transmitting the HARQ-ACK information on the PUCCH,
wherein the beam application time is configured by a radio resource control (RRC) signaling, and wherein, in case that the DCI does not include a downlink assignment, the HARQ-ACK information received from the UE on the PUCCH corresponds to the DCI indicating the TCI state without the downlink assignment.
5. The base station of claim 4 , wherein, in case that the DCI includes a downlink assignment, the HARQ-ACK information received from the UE on the PUCCH corresponds to the PDSCH scheduled by the DCI indicating the TCI state.
6. The base station of claim 4 , wherein:
the transceiver is further configured to transmit, to the UE, a medium access control (MAC) control element (CE) for one or more activated TCI states from among the one or more TCI states, and
the DCI indicates the TCI state from among one or more activated TCI states.
7. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, configuration information for one or more transmission configuration indicator (TCI) states,
receiving, from the base station, downlink control information (DCI) indicating a TCI state from among the one or more TCI states,
transmitting, to the base station, hybrid automatic repeat request-acknowledgement (HARQ-ACK) information on a physical uplink control channel (PUCCH) in response to the DCI or in response to a physical downlink shared channel (PDSCH) scheduled by the DCI, and
performing reception of a downlink signal or transmission of an uplink signal, based on the indicated TCI state,
wherein, based on determination that the indicated TCI state is different from a previously indicated TCI state, the indicated TCI state is applied after a beam application time from an end time of transmitting the HARQ-ACK information on the PUCCH,
wherein the beam application time is configured by a radio resource control (RRC) signaling, and wherein, in case that the DCI does not include a downlink assignment, the HARQ-ACK information transmitted to the base station on the PUCCH corresponds to the DCI indicating the TCI state without the downlink assignment.
8. The method of claim 7 , wherein, in case that the DCI includes a downlink assignment, the HARQ-ACK information transmitted to the base station on the PUCCH corresponds to the PDSCH scheduled by the DCI indicating the TCI state.
9. The method of claim 7 , further comprising:
receiving, from the base station, a medium access control (MAC) control element (CE) for one or more activated TCI states from among the one or more TCI states,
wherein the DCI indicates the TCI state from among one or more activated TCI states.