Method and user equipment for beam indication for uplink transmission

1. A method performed by a User Equipment (UE) for beam indication for uplink (UL) transmission, 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 Uplink Control Channel (PUCCH) and at least one Physical Uplink Shared Channel (PUSCH);

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 a Physical Downlink Shared Channel (PDSCH) reception;

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

transmitting the at least one PUCCH and the at least one PUSCH based on a spatial transmitter (TX) parameter derived according to the indicated one of the one or more first TCI states after transmitting the HARQ-ACK, the at least one PUCCH being different from the first PUCCH, wherein

a second TCI state, different from the indicated one of the one or more first TCI states, is applied to the first PUCCH.

2. The method of claim 1 , further comprising:

receiving a second configuration for configuring a third 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 third TCI state is applied only for receiving a PDSCH scheduled by second DCI.

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

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

6. The method of claim 1 , further comprising:

transmitting, after transmitting the HARQ-ACK, at least one of a periodic Sounding Reference Signal (SRS), a semi-persistent SRS, an aperiodic SRS, an SRS for beam management, and a UL positioning reference signal based on the spatial TX parameter derived according to the indicated one of the one or more first TCI states.

7. The method of claim 1 , wherein at least one of a Sounding Reference Signal (SRS) for beam management, an SRS for non-codebook (NCB)-based transmission, a PUSCH for NCB-based transmission, a Physical Random Access Channel, and an SRS for positioning is not applied for the indicated one of the one or more first TCI states.

8. A user equipment (UE) for beam indication for uplink (UL) transmission, the UE comprising:

one or more non-transitory computer-readable media storing 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 computer-executable instructions 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 Uplink Control Channel (PUCCH) and at least one Physical Uplink Shared Channel (PUSCH);

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 a Physical Downlink Shared Channel (PDSCH) reception;

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

transmit the at least one PUCCH and the at least one PUSCH based on a spatial transmitter (TX) parameter derived according to the indicated one of the one or more first TCI states after transmitting the HARQ-ACK, the at least one PUCCH being different from the first PUCCH, wherein

a second TCI state, different from the indicated one of the one or more first TCI states, is applied to the first PUCCH.

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

receive a second configuration for configuring a third 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 third TCI state is applied only for a PDSCH scheduled by second DCI.

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

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

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

transmit, after transmitting the HARQ-ACK, at least one of a periodic Sounding Reference Signal (SRS), a semi-persistent SRS, an aperiodic an SRS, an SRS for beam management, and a UL positioning reference signal based on the spatial TX parameter derived according to the indicated one of the one or more first TCI states.

14. The UE of claim 8 , wherein at least one of a Sounding Reference Signal (SRS) for beam management, an SRS for non-codebook (NCB)-based transmission, a PUSCH for NCB-based transmission, a Physical Random Access Channel, and an SRS for positioning is not applied for the indicated one of the one or more first TCI states.