Hybrid automatic repeat request feedback for multicast

1 . An apparatus for wireless communication at a user equipment (UE), comprising:

one or more memories; and

one or more processors, coupled to the one or more memories, configured to:

receive, from a network entity, configuration information relating to a downlink assignment index (DAI) indication;

receive, from the network entity, an uplink grant for a physical uplink shared channel (PUSCH) that is to overlap in time with a physical uplink control channel (PUCCH) used for hybrid automatic repeat request (HARQ) feedback for at least multicast, the uplink grant including the DAI indication,

wherein the DAI indication includes a plurality of DAIs that are grouped separately for different HARQ feedback types in accordance with the configuration information, and

wherein the uplink grant indicates whether the HARQ feedback of the PUCCH is to be multiplexed on the PUSCH; and

communicate, with the network entity, in accordance with the DAI indication.

2 . The apparatus of claim 1 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a semi-static HARQ codebook for multicast, and

wherein the DAI indication includes a single bit that is commonly applicable for one or more multicast radio network temporary identifiers configured for the UE for a cell.

3 . The apparatus of claim 1 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes one or more multiple-bit DAIs that are respectively applicable per multicast radio network temporary identifier configured for the UE.

4 . The apparatus of claim 1 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes multiple bits that are commonly applicable for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE or a subset of the one or more multicast RNTIs.

5 . The apparatus of claim 1 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a semi-static HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes a single bit that is commonly applicable for unicast and for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE.

6 . The apparatus of claim 5 ,

wherein the DAI indication includes the single bit that is commonly applicable for unicast and for the one or more multicast RNTIs responsive to a configuration of the UE that results in physical downlink shared channel occasions being commonly counted for unicast and multicast.

7 . The apparatus of claim 1 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a semi-static HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes a first single bit that is applicable for unicast and a second single bit that is applicable for one or more multicast radio network temporary identifiers configured for the UE.

8 . The apparatus of claim 1 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a dynamic HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes multiple bits that are commonly applicable for unicast and for one multicast radio network temporary identifier (RNTI) configured for the UE or a group of multicast RNTIs configured for the UE.

9 . The apparatus of claim 1 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a dynamic HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes a first multiple-bit DAI that is applicable for unicast and a second multiple-bit DAI that is applicable for one multicast radio network temporary identifier (RNTI) configured for the UE or a group of multicast RNTIs configured for the UE.

10 . The apparatus of claim 1 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a semi-static HARQ codebook for unicast and a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes a first DAI that includes a bit that is applicable for unicast and a second multiple-bit DAI that is applicable for one or more multicast radio network temporary identifier (RNTIs) configured for the UE or one or more groups of multicast RNTIs configured for the UE.

11 . The apparatus of claim 1 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a dynamic HARQ codebook for unicast and a semi-static HARQ codebook for multicast, and

wherein the DAI indication includes a first multiple-bit DAI that is applicable for unicast and a second DAI that includes a bit that is applicable for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE.

12 . The apparatus of claim 1 ,

wherein the UE is configured to use a dynamic HARQ codebook for multicast,

wherein the DAI indication is applicable for one or more multicast radio network temporary identifier (RNTIs) configured for the UE, and

wherein the HARQ feedback associated with the one or more multicast RNTIs is not multiplexed on the PUSCH if the DAI indication indicates that the UE is not to multiplex the HARQ feedback on the PUSCH and if the UE did not receive, within a set of monitoring occasions, a physical downlink control channel with a cyclic redundancy check scrambled using the one or more multicast RNTIs.

13 . The apparatus of claim 1 ,

wherein a UE capability of the UE indicates support for multiplexing unicast and multicast HARQ feedback in a PUSCH.

14 . An apparatus for wireless communication at a network entity, comprising:

one or more memories; and

one or more processors, coupled to the one or more memories, configured to:

transmit, for a user equipment (UE), configuration information relating to a downlink assignment index (DAI) indication;

transmit, for the UE, an uplink grant for a physical uplink shared channel (PUSCH) that is to overlap in time with a physical uplink control channel (PUCCH) used for hybrid automatic repeat request (HARQ) feedback for at least multicast, the uplink grant including the DAI indication,

wherein the DAI indication includes a plurality of DAIs that are grouped separately for different HARQ feedback types in accordance with the configuration information, and

wherein the uplink grant indicates whether the HARQ feedback of the PUCCH is to be multiplexed on the PUSCH; and

communicate in accordance with the DAI indication.

15 . The apparatus of claim 14 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a semi-static HARQ codebook for multicast, and

wherein the DAI indication includes a single bit that is commonly applicable for one or more multicast radio network temporary identifiers configured for the UE for a cell.

16 . The apparatus of claim 14 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes one or more multiple-bit DAIs that are respectively applicable per multicast radio network temporary identifier configured for the UE.

17 . The apparatus of claim 14 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes multiple bits that are commonly applicable for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE or a subset of the one or more multicast RNTIs.

18 . The apparatus of claim 14 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a semi-static HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes a single bit that is commonly applicable for unicast and for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE.

19 . The apparatus of claim 18 ,

wherein the DAI indication includes the single bit that is commonly applicable for unicast and for the one or more multicast RNTIs responsive to a configuration of the UE that results in physical downlink shared channel occasions being commonly counted for unicast and multicast.

20 . The apparatus of claim 14 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a semi-static HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes a first single bit that is applicable for unicast and a second single bit that is applicable for one or more multicast radio network temporary identifiers configured for the UE.

21 . The apparatus of claim 14 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a dynamic HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes multiple bits that are commonly applicable for unicast and for one multicast radio network temporary identifier (RNTI) configured for the UE or a group of multicast RNTIs configured for the UE.

22 . The apparatus of claim 14 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a dynamic HARQ codebook for unicast and for multicast, and

wherein the DAI indication includes a first multiple-bit DAI that is applicable for unicast and a second multiple-bit DAI that is applicable for one multicast radio network temporary identifier (RNTI) configured for the UE or a group of multicast RNTIs configured for the UE.

23 . The apparatus of claim 14 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a semi-static HARQ codebook for unicast and a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes a first DAI that includes a bit that is applicable for unicast and a second multiple-bit DAI that is applicable for one or more multicast radio network temporary identifier (RNTIs) configured for the UE or one or more groups of multicast RNTIs configured for the UE.

24 . The apparatus of claim 14 ,

wherein the HARQ feedback is for unicast and for multicast and the UE is configured to use a dynamic HARQ codebook for unicast and a semi-static HARQ codebook for multicast, and

wherein the DAI indication includes a first multiple-bit DAI that is applicable for unicast and a second DAI that includes a bit that is applicable for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE.

25 . The apparatus of claim 14 ,

wherein the UE is configured to use a dynamic HARQ codebook for multicast,

wherein the DAI indication is applicable for one or more multicast radio network temporary identifier (RNTIs) configured for the UE, and

wherein the HARQ feedback associated with the one or more multicast RNTIs is not multiplexed on the PUSCH if the DAI indication indicates that the UE is not to multiplex the HARQ feedback on the PUSCH and if the UE did not receive, within a set of monitoring occasions, a physical downlink control channel with a cyclic redundancy check scrambled using the one or more multicast RNTIs.

26 . The apparatus of claim 14 ,

wherein a UE capability of the UE indicates support for multiplexing unicast and multicast HARQ feedback in a PUSCH.

27 . A method of wireless communication performed by an apparatus of a user equipment (UE), comprising:

receiving, from a network entity, configuration information relating to a downlink assignment index (DAI) indication;

receiving, from the network entity, an uplink grant for a physical uplink shared channel (PUSCH) that is to overlap in time with a physical uplink control channel (PUCCH) used for hybrid automatic repeat request (HARQ) feedback for at least multicast, the uplink grant including the DAI indication,

wherein the DAI indication includes a plurality of DAIs that are grouped separately for different HARQ feedback types in accordance with the configuration information, and

wherein the uplink grant indicates whether the HARQ feedback of the PUCCH is to be multiplexed on the PUSCH; and

communicating, with the network entity, in accordance with the DAI indication.

28 . The method of claim 27 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes multiple bits that are commonly applicable for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE or a subset of the one or more multicast RNTIs.

29 . A method of wireless communication performed by an apparatus of a network entity, comprising:

transmitting, for a user equipment (UE), configuration information relating to a downlink assignment index indication;

transmitting, for the UE, an uplink grant for a physical uplink shared channel (PUSCH) that is to overlap in time with a physical uplink control channel (PUCCH) used for hybrid automatic repeat request (HARQ) feedback for at least multicast, the uplink grant including the DAI indication,

wherein the DAI indication includes a plurality of DAIs that are grouped separately for different HARQ feedback types in accordance with the configuration information, and

wherein the uplink grant indicates whether the HARQ feedback of the PUCCH is to be multiplexed on the PUSCH; and

communicating in accordance with the DAI indication.

30 . The method of claim 29 ,

wherein the HARQ feedback is for only multicast and the UE is configured to use a dynamic HARQ codebook for multicast, and

wherein the DAI indication includes multiple bits that are commonly applicable for one or more multicast radio network temporary identifiers (RNTIs) configured for the UE or a subset of the one or more multicast RNTIs.