USER EQUIPMENT AND METHOD FOR HANDLING HARQ-ACK FEEDBACK

1 . A method for handling hybrid automatic repeat request (HARQ)-acknowledgment (ACK) feedback performed by a user equipment (UE), the method comprising:

receiving, from a base station (BS), a parameter for disabling a HARQ-ACK feedback for a HARQ process identifier (ID);

receiving, from the BS, downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the DCI indicating the HARQ process ID;

setting a HARQ-ACK bit associated with the HARQ process ID to a bit value representing a negative acknowledgment (NACK); and

transmitting, to the BS, a HARQ-ACK codebook including the HARQ-ACK bit.

2 . The method of claim 1 , wherein the parameter is received via radio resource control (RRC) signaling.

3 . The method of claim 1 , wherein the parameter includes a list of HARQ process IDs for indicating that HARQ-ACK feedbacks for the list of HARQ process IDs are disabled.

4 . The method of claim 1 , wherein the HARQ-ACK codebook is transmitted on a physical uplink control channel (PUCCH).

5 . The method of claim 4 , further comprising:

obtaining an adjusted number of HARQ-ACK bits by precluding the HARQ-ACK bit associated with the HARQ process ID; and

determining a transmission power for the PUCCH according to the adjusted number of HARQ-ACK bits.

6 . The method of claim 1 , further comprising:

receiving, from the BS, a timing offset used in a Non-Terrestrial Network (NTN), wherein the timing offset is associated with a time interval between the PDSCH and the transmission of the HARQ-ACK codebook.

7 . The method of claim 6 , further comprising:

determining one or more candidate PDSCH reception occasions corresponding to the HARQ-ACK codebook according to the timing offset.

8 . The method of claim 6 , further comprising:

receiving, from the BS, a k1 value that indicates a time difference between the PDSCH and the transmission of the HARQ-ACK codebook in a Terrestrial Network; and

obtaining the time interval between the PDSCH and the transmission of the HARQ-ACK codebook in the NTN by adding the k1 value with the timing offset.

9 . A user equipment (UE) for handling hybrid automatic repeat request (HARQ)-acknowledgment (ACK) feedback, comprising:

at least one processor; and

at least one memory coupled to the at least one processor, wherein the at least one memory stores computer-executable instructions that, when executed by the at least one processor, cause the UE to:

receive, from a base station (BS), a parameter for disabling a HARQ-ACK feedback for a HARQ process identifier (ID);

receive, from the BS, downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the DCI indicating the HARQ process ID:

set a HARQ-ACK bit associated with the HARQ process ID to a bit value representing a negative acknowledgment (NACK); and

transmit, to the BS, a HARQ-ACK codebook including the HARQ-ACK bit.

10 . The UE of claim 9 , wherein the parameter is received via radio resource control (RRC) signaling.

11 . The UE of claim 9 , wherein the parameter includes a list of HARQ process IDs for indicating that HARQ-ACK feedbacks for the list of HARQ process IDs are disabled.

12 . The UE of claim 9 , wherein the HARQ-ACK codebook is transmitted on a physical uplink control channel (PUCCH).

13 . The UE of claim 12 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

obtain an adjusted number of HARQ-ACK bits by precluding the HARQ-ACK bit associated with the HARQ process ID; and

determine a transmission power for the PUCCH according to the adjusted number of HARQ-ACK bits.

14 . The UE of claim 9 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

receive, from the BS, a timing offset used in a Non-Terrestrial Network (NTN), wherein the timing offset is associated with a time interval between the PDSCH and the transmission of the HARQ-ACK codebook.

15 . The UE of claim 14 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

determine one or more candidate PDSCH reception occasions corresponding to the HARQ-ACK codebook according to the timing offset.

16 . The UE of claim 14 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

receive, from the BS, a k1 value that indicates a time difference between the PDSCH and the transmission of the HARQ-ACK codebook in a Terrestrial Network; and

obtain the time interval between the PDSCH and the transmission of the HARQ-ACK codebook in the NTN by adding the k1 value with the timing offset.