Method and apparatus for HARQ-ACK feedback for semi-persistent scheduling transmission

1 . A method performed by a user equipment (UE), the method comprising:

receiving configuration information for a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) configuration;

receiving, in a first slot, a downlink control information (DCI) format for activating the SPS PDSCH configuration, wherein the DCI format is associated with a plurality of UEs including the UE;

determining, based on the configuration information, a physical uplink control channel (PUCCH) resource and a second slot for transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the DCI format; and

transmitting, in the second slot, the HARQ-ACK feedback for the DCI format on the PUCCH resource.

2 . The method of claim 1 , wherein the configuration information configures the PUCCH resource specifically for the UE.

3 . The method of claim 1 , wherein determining the second slot comprises:

determining a HARQ-ACK feedback timing value that indicates an offset between the first slot and the second slot; and

determining the second slot based on the first slot and the HARQ-ACK feedback timing value.

4 . The method of claim 3 , wherein the DCI format includes an indicator indicating the HARQ-ACK feedback timing value from a set of HARQ-ACK feedback timing values.

5 . A user equipment (UE) for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UE to:

receive configuration information for a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) configuration;

receive, in a first slot, a downlink control information (DCI) format for activating the SPS PDSCH configuration, wherein the DCI format is associated with a plurality of UEs including the UE;

determine, based on the configuration information, a physical uplink control channel (PUCCH) resource and a second slot for transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the DCI format; and

transmit, in the second slot, the HARQ-ACK feedback for the DCI format on the PUCCH resource.

6 . The UE of claim 5 , wherein the configuration information configures the PUCCH resource specifically for the UE.

7 . The UE of claim 5 , wherein to determine the second slot, the at least one processor is configured to cause the UE to:

determine a HARQ-ACK feedback timing value that indicates an offset between the first slot and the second slot; and

determine the second slot based on the first slot and the HARQ-ACK feedback timing value.

8 . The UE of claim 7 , wherein the DCI format includes an indicator indicating the HARQ-ACK feedback timing value from a set of HARQ-ACK feedback timing values.

9 . The UE of claim 5 , wherein the at least one processor is further configured to cause the UE to:

receive an SPS PDSCH in a third slot according to the SPS PDSCH configuration, wherein the SPS PDSCH is associated with the plurality of UEs including the UE; and

transmit HARQ-ACK feedback for the SPS PDSCH on the PUCCH resource in a fourth slot.

10 . The UE of claim 9 , wherein the at least one processor is further configured to cause the UE to determine the fourth slot based on the third slot and an offset indicated by the DCI format.

11 . The UE of claim 9 , wherein to transmit the HARQ-ACK feedback for the SPS PDSCH, the at least one processor is configured to cause the UE to at least one of:

transmit an acknowledgement (ACK) for the SPS PDSCH on the PUCCH resource in response to successfully receiving the SPS PDSCH;

transmit nothing on the PUCCH resource in response to not successfully receiving the SPS PDSCH;

transmit a negative ACK (NACK) for the SPS PDSCH on the PUCCH resource in response to not successfully receiving the SPS PDSCH; or

transmit the ACK for the SPS PDSCH on the PUCCH resource or an additional PUCCH resource in response to successfully receiving the SPS PDSCH, and transmit the NACK for the SPS PDSCH on the additional PUCCH resource or the PUCCH resource in response to not successfully receiving the SPS PDSCH, wherein the configuration information configures the additional PUCCH resource.

12 . The UE of claim 9 , wherein the at least one processor is further configured to cause the UE to:

receive, in a fifth slot, an additional DCI format for deactivating the SPS PDSCH configuration, wherein the additional DCI format is associated with the plurality of UEs including the UE; and

transmit additional HARQ-ACK feedback for the additional DCI format on the PUCCH resource in a sixth slot.

13 . The UE of claim 12 , wherein the at least one processor is further configured to cause the UE to determine the sixth slot based on the fifth slot and a HARQ-ACK feedback timing value that indicates an offset between the fifth slot and the sixth slot.

14 . A method performed by a base station (BS), the method comprising:

transmitting configuration information for a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) configuration;

transmitting, to a plurality of user equipment (UEs) and in a first slot, a downlink control information (DCI) format for activating the SPS PDSCH configuration;

determining, based on the configuration information, a physical uplink control channel (PUCCH) resource and a second slot for receiving hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the DCI format; and

receiving, in the second slot, the HARQ-ACK feedback for the DCI format on the PUCCH resource.

15 . A base station (BS) for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the BS to:

transmit configuration information for a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) configuration;

transmit, to a plurality of user equipment (UEs) and in a first slot, a downlink control information (DCI) format for activating the SPS PDSCH configuration;

determine, based on the configuration information, a physical uplink control channel (PUCCH) resource and a second slot for receiving hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for the DCI format; and

receive, in the second slot, the HARQ-ACK feedback for the DCI format on the PUCCH resource.

16 . The BS of claim 15 , wherein to determine the second slot, the at least one processor is configured to cause the BS to:

determine a HARQ-ACK feedback timing value that indicates an offset between the first slot and the second slot; and

determine the second slot based on the first slot and the HARQ-ACK feedback timing value.

17 . The BS of claim 16 , wherein the DCI format includes an indicator indicating the HARQ-ACK feedback timing value from a set of HARQ-ACK feedback timing values.

18 . The BS of claim 15 , wherein the at least one processor is further configured to cause the BS to:

transmit, to the plurality of UEs, an SPS PDSCH in a third slot according to the SPS PDSCH configuration; and

receive, from at least one UE of the plurality of UEs, HARQ-ACK feedback for the SPS PDSCH on the PUCCH resource in a fourth slot.

19 . The BS of claim 18 , wherein to receive the HARQ-ACK feedback for the SPS PDSCH, the at least one processor is configured to cause the BS to at least one of:

receive an acknowledgement (ACK) for the SPS PDSCH on the PUCCH resource in response to the SPS PDSCH being successfully received by the at least one UE;

receive nothing on the PUCCH resource in response to the SPS PDSCH not being successfully received by the at least one UE;

receive a negative ACK (NACK) for the SPS PDSCH on the PUCCH resource in response to the SPS PDSCH not being successfully received by the at least one UE; or

receive the ACK for the SPS PDSCH on the PUCCH resource or an additional PUCCH resource in response to the SPS PDSCH being successfully received by the at least one UE, and receive the NACK for the SPS PDSCH on the additional PUCCH resource or the PUCCH resource in response to the SPS PDSCH not being successfully received by the at least one UE, wherein the configuration information configures the additional PUCCH resource.

20 . The BS of claim 18 , wherein the at least one processor is configured to cause the BS to:

transmit, to the plurality of UEs and in a fifth slot, an additional DCI format for deactivating the SPS PDSCH configuration; and

receive HARQ-ACK feedback for the additional DCI format on the PUCCH resource in a sixth slot.