Semi-persistent scheduling of multicast and broadcast services

1. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive, from a base station, radio resource control messages comprising configuration parameters of a first semi-persistent scheduling (SPS) for multicast and broadcast services (MBS), wherein the configuration parameters of the first SPS comprise a first hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook index;

receive a multicast transport block (TB) based on receiving a group common downlink control information (DCI) indicating an activation of the first SPS; and

transmit first feedback for the multicast TB in a first HARQ-ACK codebook, of HARQ-ACK codebooks, indicated by the first HARQ-ACK codebook index.

2. The wireless device of claim 1 , wherein the wireless device determines that the group common DCI indicates the activation of the first SPS based on:

cyclic redundancy check (CRC) bits of the group common DCI being scrambled by a group common radio network temporary identifier (RNTI); and

a value of a redundancy version (RV) field, of the group common DCI, being set to a predefined value.

3. The wireless device of claim 2 , wherein a SPS configuration index of the first SPS, from a plurality of SPSs configured for the MBS, is indicated by a hybrid automatic repeat request (HARQ) process number of the group common DCI.

4. The wireless device of claim 2 , wherein the group common RNTI is:

comprised in configuration parameters of the MBS in the radio resource control messages and used for SPS activation/deactivation for the MBS; and

different from a second RNTI used for SPS activation/deactivation for unicast transmissions.

5. The wireless device of claim 1 , wherein:

the radio resource control messages comprise configuration parameters, of the MBS, indicating common frequency resources for the MBS; and

the first SPS is configured on the common frequency resources comprising one or more resource blocks (RBs) within a bandwidth part (BWP) of a cell.

6. The wireless device of claim 5 , wherein the wireless device receives, in the common frequency resources of the BWP:

the group common DCI; and

the multicast TB.

7. The wireless device of claim 5 , wherein a total number of the one or more RBs for the common frequency resources is less than a total number of RBs of the BWP.

8. The wireless device of claim 1 , wherein:

the wireless device transmits the first feedback for the multicast TB associated with a first HARQ process, of the HARQ processes, identified by a first HARQ process number; and

the first HARQ process number is determined based on:

a slot on which the wireless device receives the multicast TB;

a periodicity of the first SPS; and

a total number of HARQ processes for the first SPS.

9. A base station comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the base station to:

transmit, to a wireless device, radio resource control messages comprising configuration parameters of a first semi-persistent scheduling (SPS) for multicast and broadcast services (MBS), wherein the configuration parameters of the first SPS comprise a first hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook index;

transmit a multicast transport block (TB) based on receiving a group common downlink control information (DCI) indicating an activation of the first SPS; and

receive, from the wireless device, first feedback for the multicast TB in a first HARQ-ACK codebook, of HARQ-ACK codebooks, indicated by the first HARQ-ACK codebook index.

10. The base station of claim 9 , wherein the group common DCI indicates the activation of the first SPS based on:

cyclic redundancy check (CRC) bits of the group common DCI being scrambled by a group common radio network temporary identifier (RNTI); and

a value of a redundancy version (RV) field, of the group common DCI, being set to a predefined value.

11. The base station of claim 10 , wherein a SPS configuration index of the first SPS, from a plurality of SPSs configured for the MBS, is indicated by a hybrid automatic repeat request (HARM) process number of the group common DCI.

12. The base station of claim 10 , wherein the group common RNTI is:

comprised in configuration parameters of the MBS in the radio resource control messages and used for SPS activation/deactivation for the MBS; and

different from a second RNTI used for SPS activation/deactivation for unicast transmissions.

13. The base station of claim 9 , wherein:

the radio resource control messages comprise configuration parameters, of the MBS, indicating common frequency resources for the MBS; and

the first SPS is configured on the common frequency resources comprising one or more resource blocks (RBs) within a bandwidth part (BWP) of a cell.

14. The base station of claim 13 , wherein the base station transmits, in the common frequency resources of the BWP:

the group common DCI; and

the multicast TB.

15. The base station of claim 13 , wherein a total number of the one or more RBs for the common frequency resources is less than a total number of RBs of the BWP.

16. The base station of claim 9 , wherein:

the base station receives the first feedback for the multicast TB associated with a first HARQ process, of the HARQ processes, identified by a first HARQ process number; and

the first HARQ process number is determined based on:

a slot on which the base station transmits the multicast TB;

a periodicity of the first SPS; and

a total number of HARQ processes for the first SPS.

17. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to:

receive, from a base station, radio resource control messages comprising configuration parameters of a first semi-persistent scheduling (SPS) for multicast and broadcast services (MBS), wherein the configuration parameters of the first SPS comprise a first hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook index;

receiving a multicast transport block (TB) based on receiving a group common downlink control information (DCI) indicating an activation of the first SPS; and

transmitting first feedback for the multicast TB in a first HARQ-ACK codebook, of HARQ-ACK codebooks, indicated by the first HARQ-ACK codebook index.

18. The non-transitory computer-readable medium of claim 17 , wherein the one or more processors determine that the group common DCI indicates the activation of the first SPS based on:

cyclic redundancy check (CRC) bits of the group common DCI being scrambled by a group common radio network temporary identifier (RNTI); and

a value of a redundancy version (RV) field, of the group common DCI, being set to a predefined value.

19. The non-transitory computer-readable medium of claim 18 , wherein a SPS configuration index of the first SPS, from a plurality of SPSs configured for the MBS, is indicated by a hybrid automatic repeat request (HARQ) process number of the group common DCI.

20. The non-transitory computer-readable medium of claim 18 , wherein the group common RNTI is:

comprised in configuration parameters of the MBS in the radio resource control messages and used for SPS activation/deactivation for the MBS; and

different from a second RNTI used for SPS activation/deactivation for unicast transmissions.