Methods and apparatuses for physical layer beam indications
Methods and apparatuses for physical layer beam indications. A method for operating a user equipment (UE) includes receiving one or more first transmission configuration indicator (TCI) states for reception and transmission of downlink (DL) channels and uplink (UL) channels, respectively; receiving one or more TCI state identifiers (IDs); and transmitting an acknowledgement in response to the reception of the one or more TCI state IDs. The method further includes, based on the acknowledgement: determining, based on the one or more TCI state IDs, one or more second TCI states; determining a time to apply the one or more second TCI states; and updating one or more spatial filters based on the one or more second TCI states. The method further includes receiving and transmitting data on the DL channel and UL channels, respectively, using the one or more spatial filters starting at the determined time.
1. A user equipment (UE), comprising:
a transceiver configured to:
receive one or more first transmission configuration indicator (TCI) state identifiers (IDs);
receive, in a downlink control information (DCI) format included in a physical downlink control channel (PDCCH), one or more second TCI state IDs using a quasi colocation (QCL) based on the one or more first TCI state IDs; and
transmit, in response to reception of the DCI format included in the PDCCH, an acknowledgement; and
a processor operably coupled to the transceiver, the processor configured to:
determine, based on the one or more second TCI state IDs, one or more TCI states;
determine a time to apply the one or more TCI states; and
update one or more spatial filters and the QCL based on the one or more TCI states,
wherein the time to apply is based on a time of the transmission of the acknowledgement, and
wherein the transceiver is further configured, based on the acknowledgement, to receive and transmit data on downlink (DL) channels and uplink (UL) channels, respectively, using the one or more spatial filters and the QCL starting at the determined time.
2. The UE of claim 1 , wherein:
the DCI format on which the one or more second TCI state IDs were received is a DL related DCI format,
the DL related DCI format is DCI format 1_0, DCI format 1_1, or DCI format 1_2, and
the DL related DCI format includes a DL assignment.
3. The UE of claim 1 , wherein:
the acknowledgement in response to the reception of the one or more second TCI state IDs is a negative acknowledgement (NACK) of a physical downlink shared channel (PDSCH) associated with the DCI format, and
the processor is further configured to apply the one or more TCI states at the determined time after the transmission of the NACK.
4. The UE of claim 1 , wherein:
the acknowledgement in response to the reception of the one or more second TCI state IDs is a positive acknowledgement (ACK) of a physical downlink shared channel (PDSCH) associated with the DCI format, and
the processor is further configured to apply the one or more TCI states at the determined time after the transmission of the ACK.
5. The UE of claim 1 , wherein:
the DCI format on which the one or more second TCI state IDs were received is a DL related DCI format,
the DL related DCI format is DCI format 1_0, DCI format 1_1, or DCI format 1_2, and
the DL related DCI format does not include a DL assignment.
6. The UE of claim 1 , wherein:
to determine the time, the processor is further configured to determine a first beam application time and a second beam application time; and
the transceiver is further configured to receive a signal indicating to use the first beam application time or the second beam application time.
7. The UE of claim 1 , wherein:
the DCI format on which the one or more second TCI state IDs were received is a UL related DCI format,
the UL related DCI format is DCI format 0_0, DCI format 0_1, or DCI format 0_2,
the UL related DCI format includes an UL grant, and
the acknowledgement in response to the reception of the one or more second TCI state IDs is a physical uplink shared channel (PUSCH) transmission associated with the UL related DCI format.
8. A base station (BS) comprising:
a transceiver configured to transmit one or more first transmission configuration indicator (TCI) state identifiers (IDs); and
a processor operably coupled to the transceiver, the processor configured to determine one or more TCI states and corresponding one or more second TCI state identifier (IDs),
wherein, the transceiver is further configured to:
transmit, in a downlink control information (DCI) format on a physical downlink control channel (PDCCH), the one or more second TCI state IDs using a quasi colocation (QCL) based on the one or more first TCI state IDs; and
receive an acknowledgement in response to the transmission of the DCI format on the PDCCH,
wherein the processor is further configured to:
determine a time to apply the one or more TCI states; and
update one or more spatial filters and the QCL based on the one or more TCI states,
wherein the time to apply is based on a time of the transmission of the acknowledgement, and
wherein the transceiver is further configured, based on the acknowledgment, to transmit and receive data on downlink (DL) channels and uplink (UL) channels, respectively, using the one or more spatial filters and the QCL starting at the determined time.
9. The BS of claim 8 , wherein:
the DCI format on which the one or more second TCI state IDs were transmitted is a DL related DCI format,
the DL related DCI format is DCI format 1_0, DCI format 1_1, or DCI format 1_2, and
the DL related DCI format includes a DL assignment.
10. The BS of claim 8 , wherein:
the acknowledgement in response to the transmission of the one or more second TCI state IDs is a negative acknowledgement (NACK) of a physical downlink shared channel (PDSCH) associated with the DCI format, and
the processor is further configured to apply the one or more TCI states at the determined time after receiving the NACK.
11. The BS of claim 8 , wherein:
the acknowledgement in response to the transmission of the one or more second TCI state IDs is a positive acknowledgment (ACK) of a physical downlink shared channel (PDSCH) associated with the DCI format, and
the processor is further configured to apply the one or more of the TCI states at the determined time after the reception of the ACK.
12. The BS of claim 8 , wherein:
the DCI format on which the one or more second TCI state IDs were transmitted is a DL related DCI format,
the DL related DCI format is DCI format 1_0, DCI format 1_1, or DCI format 1_2, and
the DL related DCI format does not include a DL assignment.
13. The BS of claim 8 , wherein
to determine the time, the processor is further configured to:
determine a first beam application time and a second beam application time, and
determine whether to apply the first beam application time or the second beam application time, and
the transceiver is further configured to transmit a signal indicating to use the first beam application time or the second beam application time.
14. The BS of claim 8 , wherein:
the DCI format on which the one or more second TCI state IDs were transmitted is a UL related DCI format,
the UL related DCI format is DCI format 0_0, DCI Format 0_1, or DCI Format 0_2,
the UL related DCI format includes an UL grant, and
the acknowledgement in response to the transmission of the one or more second TCI state IDs is a physical uplink shared channel (PUSCH) reception associated with the UL related DCI format.
15. A method for operating a user equipment (UE), the method comprising:
receiving one or more first transmission configuration indicator (TCI) state identifiers (IDs);
receiving, in a downlink control information (DCI) format included in a physical downlink control channel (PDCCH), one or more second TCI state IDs using a quasi colocation (QCL) based on the one or more first TCI state IDs;
transmitting, in response to reception of the DCI format included in the PDCCH, an acknowledgement;
determining, based on the one or more second TCI state IDs, one or more TCI states;
determining a time to apply the one or more TCI states;
updating one or more spatial filters and the QCL based on the one or more TCI states, wherein the time to apply is based on a time of the transmission of the acknowledgement; and
receiving and transmitting data on downlink (DL) channels and uplink (UL) channels, respectively, using the one or more spatial filters and the QCL starting at the determined time.
16. The method of claim 15 , wherein:
the DCI format on which the one or more second TCI state IDs were received is a DL related DCI format,
the DL related DCI format is DCI format 1_0, DCI format 1_1, or DCI format 1_2, and
the DL related DCI format includes or does not include a DL assignment.
17. The method of claim 15 , wherein:
the acknowledgement in response to the reception of the one or more second TCI state IDs is a negative acknowledgement (NACK) of a physical downlink shared channel (PDSCH) associated with the DCI format, and
the method further comprises applying the one or more TCI states at the determined time after the transmission of the NACK.
18. The method of claim 15 , wherein:
the acknowledgement in response to the reception of the one or more second TCI state IDs is a positive acknowledgment (ACK) of a physical downlink shared channel (PDSCH) associated with the DCI format,
the method further comprises applying the one or more TCI states at the determined time after the transmission of the ACK.
19. The method of claim 15 , wherein determining the time comprises:
determining a first beam application time and a second beam application time; and
receiving a signal indicating to use the first beam application time or the second beam application time.
20. The method of claim 15 , wherein:
the DCI format on which the one or more second TCI state IDs were received is a UL related DCI format,
the UL related DCI format is DCI format 0_0, DCI format 0_1, or DCI format 0_2,
the UL related DCI format includes an UL grant, and
the acknowledgement in response to the reception of the one or more second TCI state IDs is a physical uplink shared channel (PUSCH) transmission associated with the UL related DCI format.