Method and user equipment for beam indication for downlink reception

1. A method performed by a User Equipment (UE) for beam indication for downlink (DL) reception, the method comprising:

receiving a first configuration for configuring a plurality of first Transmission Configuration Indication (TCI) states, each of the plurality of first TCI states applied to at least one Physical Downlink Control Channel (PDCCH) and at least one Physical Downlink Shared Channel (PDSCH);

receiving a Medium Access Control (MAC)-Control Element (CE) for activating one or more first TCI states from the plurality of first TCI states;

receiving first Downlink Control Information (DCI) indicating one of the one or more first TCI states activated by the MAC-CE, the first DCI comprising invalid scheduling information for any PDSCH reception;

transmitting a Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK) on a Physical Uplink Control Channel (PUCCH) determined by a field in the first DCI in response to the reception of the first DCI;

receiving the at least one PDCCH and the at least one PDSCH based on a spatial receiver (RX) parameter derived according to the indicated one of the one or more first TCI states after transmitting the HARQ-ACK; and

receiving, after transmitting the HARQ-ACK, at least one of a periodic Channel State Information (CSI)-Reference Signal (RS), a semi-persistent CSI-RS, an aperiodic CSI-RS, a CSI-RS for beam management, a CSI-RS configured with a higher layer parameter repetition set to ‘on’, a CSI-RS for CSI, and a DL positioning reference signal based on the spatial RX parameter derived according to the indicated one of the one or more first TCI states.

2. The method of claim 1 , further comprising:

receiving a second configuration for configuring a second TCI state, wherein the MAC-CE is used to indicate to the UE the second TCI state.

3. The method of claim 2 , wherein:

the second TCI state is applied only for receiving a PDSCH scheduled by second DCI, and

the PDSCH is different from the at least one PDSCH.

4. The method of claim 1 , wherein the indicated one of the one or more first TCI states is not applied to the PUCCH used for transmitting the HARQ-ACK.

5. The method of claim 1 , wherein the first DCIS does not indicate an uplink (UL) grant.

6. The method of claim 1 , wherein the first DCI is UE-specific DCI or common DCI.

7. The method of claim 1 , wherein at least one of the CSI-RS for the beam management, the CSI-RS configured with the higher layer parameter repetition set to ‘on’, a tracking RS, Synchronization Signal/Physical Broadcast Channel blocks, and the DL positioning reference signal is not applied for the indicated one of the one or more first TCI states.

8. A user equipment (UE) for beam indication for downlink (DL) reception, the UE comprising:

one or more non-transitory computer-readable media storing one or more computer-executable instructions; and

at least one processor coupled to the one or more non-transitory computer-readable media, the at least one processor configured to execute the one or more computer-executable instructions to cause the UE to:

receive a first configuration for configuring a plurality of first Transmission Configuration Indication (TCI) states, each of the plurality of first TCI states applied to at least one Physical Downlink Control Channel (PDCCH) and at least one Physical Downlink Shared Channel (PDSCH);

receive a Medium Access Control (MAC)-Control Element (CE) for activating one or more first TCI states from the plurality of first TCI states;

receive first Downlink Control Information (DCI) indicating one of the one or more first TCI states activated by the MAC-CE, the first DCI comprising invalid scheduling information for any PDSCH reception;

transmit a Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK) on a Physical Uplink Control Channel (PUCCH) determined by a field in the first DCI in response to the reception of the first DCI;

receive the at least one PDCCH and the at least one PDSCH based on a spatial receiver (RX) parameter derived according to the indicated one of the one or more first TCI states after transmitting the HARQ-ACK; and

receive, after transmitting the HARQ-ACK, at least one of a periodic Channel State Information (CSI)-Reference Signal (RS), a semi-persistent CSI-RS, an aperiodic CSI-RS, a CSI-RS for beam management, a CSI-RS configured with a higher layer parameter repetition set to “on”, a CSI-RS for CSI, and a DL positioning reference signal based on the spatial RX parameter derived according to the indicated one of the one or more first TCI states.

9. The UE of claim 8 , wherein the at least one processor is further configured to execute the one or more computer-executable instructions to cause the UE to:

receive a second configuration for configuring a second TCI state, wherein the MAC-CE is used to indicate to the UE the second TCI state.

10. The UE of claim 9 , wherein:

the second TCI state is applied only for receiving a PDSCH scheduled by second DCI, and

the PDSCH is different from the at least one PDSCH.

11. The UE of claim 8 , wherein the indicated one of the one or more first TCI states is not applied to the PUCCH used for transmitting the HARQ-ACK.

12. The UE of claim 8 , wherein the first DCI is not does not indicate an uplink (UL) grant.

13. The UE of claim 8 , wherein the first DCI is a UE-specific DCI or a common DCI.

14. The UE of claim 8 , wherein at least one of the CSI-RS for the beam management, the CSI-RS configured with the higher layer parameter repetition set to “on”, a tracking RS, Synchronization Signal/Physical Broadcast Channel blocks, and the DL positioning reference signal is not applied for the indicated one of the one or more first TCI states.