Coordination between multicast/broadcast communication and unicast communication

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

receiving a configuration for a shared physical downlink shared channel (PDSCH), wherein the configuration indicates a single packet data convergence protocol layer for both a multicast/broadcast communication and a unicast communication, a first radio link control layer associated with a first medium access control layer and a first physical layer for the multicast/broadcast communication, and a second radio link control layer associated with a second medium access control layer and a second physical layer for the unicast communication;

receiving a first communication via the shared PDSCH and a first bearer based at least in part on the configuration, the first communication being one of the unicast communication or the multicast/broadcast communication; and

receiving a second communication via the shared PDSCH and the first bearer or a second bearer based at least in part on the configuration, the second communication being the other of the unicast communication or the multicast/broadcast communication.

2. The method of claim 1 , wherein the first bearer is a multicast broadcast radio bearer (MRB) and both the first communication and the second communication are received via the MRB.

3. The method of claim 1 , wherein the first bearer is one of a multicast broadcast radio bearer (MRB) or a dedicated radio bearer (DRB), the second bearer is the other of the MRB or the DRB, the first communication is received via the first bearer, and the second communication is received via the second bearer.

4. The method of claim 1 , further comprising:

receiving another configuration for the shared PDSCH, wherein the other configuration indicates the single packet data convergence protocol layer for both the multicast/broadcast communication and the unicast communication, a single radio link control layer for both the multicast/broadcast communication and the unicast communication, a single medium access control layer for both the multicast/broadcast communication and the unicast communication, the first physical layer for the multicast/broadcast communication, and the second physical layer for the unicast communication; and

receiving a third communication via the shared PDSCH based at least in part on the other configuration.

5. The method of claim 1 , further comprising transmitting uplink feedback, associated with at least one of the first communication or the second communication, using a cell radio network temporary identifier.

6. The method of claim 5 , wherein the uplink feedback includes an identifier that identifies at least one of: a multicast broadcast radio bearer (MRB) used for at least one of the first communication or the second communication, a group radio network temporary identifier associated with the MRB, or a logical channel identifier associated with the MRB.

7. The method of claim 1 , further comprising:

receiving another configuration for the shared PDSCH, wherein the other configuration indicates separate packet data convergence protocol layers, separate radio link control layers, separate medium access control layers, and separate physical layers for the multicast/broadcast communication and the unicast communication; and

receiving a third communication via the shared PDSCH based at least in part on the other configuration.

8. The method of claim 7 , wherein, for the other configuration, a packet data convergence protocol sequence number space is shared between the first bearer and the second bearer, wherein the first bearer is one of a multicast broadcast radio bearer (MRB) or a dedicated radio bearer (DRB), and wherein the second bearer is the other of the MRB or the DRB.

9. The method of claim 1 , wherein the first communication is an initial transmission scrambled using a group radio network temporary identifier and the first bearer is a multicast broadcast radio bearer (MRB), and wherein the second communication is a retransmission scrambled using a cell radio network temporary identifier and the second bearer is a dedicated radio bearer (DRB), wherein the retransmission has a different redundancy version than the initial transmission.

10. The method of claim 1 , wherein the first communication includes a base layer of a multi-layer video transmission and the second communication includes an enhancement layer of the multi-layer video transmission.

11. The method of claim 1 , wherein a maximum data rate for the first bearer is based at least in part on a guaranteed bit rate associated with the first bearer.

12. The method of claim 1 , wherein a maximum combined data rate for the first bearer and the second bearer is based at least in part on a maximum bit rate associated with at least one of the first bearer or the second bearer.

13. A method of wireless communication performed by a network entity, comprising:

transmitting a configuration for a shared physical downlink shared channel (PDSCH), wherein the configuration indicates a single packet data convergence protocol layer for both a multicast/broadcast communication and a unicast communication, a first radio link control layer associated with a first medium access control layer and a first physical layer for the multicast/broadcast communication, and a second radio link control layer associated with a second medium access control layer and a second physical layer for the unicast communication;

transmitting a first communication via the shared PDSCH and a first bearer based at least in part on the configuration, the first communication being one of the unicast communication or the multicast/broadcast communication; and

transmitting a second communication via the shared PDSCH and the first bearer or a second bearer based at least in part on the configuration, the second communication being the other of the unicast communication or the multicast/broadcast communication.

14. The method of claim 13 , wherein the first bearer is a multicast broadcast radio bearer (MRB) and both the first communication and the second communication are transmitted via the MRB.

15. The method of claim 13 , wherein the first bearer is one of a multicast broadcast radio bearer (MRB) or a dedicated radio bearer (DRB), the second bearer is the other of the MRB or the DRB, the first communication is transmitted via the first bearer, and the second communication is transmitted via the second bearer.

16. The method of claim 13 , further comprising:

transmitting another configuration for the shared PDSCH, wherein the other configuration indicates the single packet data convergence protocol layer for both the multicast/broadcast communication and the unicast communication, a single radio link control layer for both the multicast/broadcast communication and the unicast communication, a single medium access control layer for both the multicast/broadcast communication and the unicast communication, the first physical layer for the multicast/broadcast communication, and the second physical layer for the unicast communication; and

transmitting a third communication via the shared PDSCH based at least in part on the other configuration.

17. The method of claim 16 , further comprising dynamically scheduling packets over the first physical layer, the second physical layer, or both.

18. The method of claim 13 , further comprising:

receiving uplink feedback, associated with at least one of the first communication or the second communication, using a cell radio network temporary identifier; and

transmitting a different configuration based at least in part on the uplink feedback.

19. The method of claim 18 , wherein the uplink feedback includes an identifier that identifies at least one of: a multicast broadcast radio bearer (MRB) used for at least one of the first communication or the second communication, a group radio network temporary identifier associated with the MRB, or a logical channel identifier associated with the MRB, or a combination thereof.

20. The method of claim 13 , further comprising dynamically scheduling packets over the first radio link control layer, the second radio link control layer, or both.

21. The method of claim 13 , further comprising:

transmitting another configuration for the shared PDSCH, wherein the other configuration indicates separate packet data convergence protocol layers, separate radio link control layers, separate medium access control layers, and separate physical layers for the multicast/broadcast communication and the unicast communication; and

transmitting a third communication via the shared PDSCH based at least in part on the other configuration.

22. The method of claim 21 , wherein, for the other configuration, a packet data convergence protocol sequence number space is shared between the first bearer and the second bearer, wherein the first bearer is one of a multicast broadcast radio bearer (MRB) or a dedicated radio bearer (DRB), and wherein the second bearer is the other of the MRB or the DRB.

23. The method of claim 21 , further comprising dynamically switching between the first bearer and the second bearer, wherein the first bearer is one of a multicast broadcast radio bearer (MRB) or a dedicated radio bearer (DRB), and wherein the second bearer is the other of the MRB or the DRB.

24. The method of claim 23 , further comprising assigning a sequence number, to a communication transmitted after the switching, that continues from a sequence number used for a communication transmitted before the switching.

25. The method of claim 13 , wherein the first communication is an initial transmission scrambled using a group radio network temporary identifier and the first bearer is a multicast broadcast radio bearer (MRB), and wherein the second communication is a retransmission scrambled using a cell radio network temporary identifier and the second bearer is a dedicated radio bearer (DRB), wherein the retransmission has a different redundancy version than the initial transmission.

26. The method of claim 13 , wherein the first communication includes a base layer of a multi-layer video transmission and the second communication includes an enhancement layer of the multi-layer video transmission.

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

a memory; and

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

receive a configuration for a shared physical downlink shared channel (PDSCH), wherein the configuration indicates a single packet data convergence protocol layer for both a multicast/broadcast communication and a unicast communication, a first radio link control layer associated with a first medium access control layer and a first physical layer for the multicast/broadcast communication, and a second radio link control layer associated with a second medium access control layer and a second physical layer for the unicast communication;

receive a first communication via the shared PDSCH and a first bearer based at least in part on the configuration, the first communication being one of the unicast communication or the multicast/broadcast communication; and

receive a second communication via the shared PDSCH and the first bearer or a second bearer based at least in part on the configuration, the second communication being the other of the unicast communication or the multicast/broadcast communication.

28. The UE of claim 27 , wherein the one or more processors are further configured to:

receive another configuration for the shared PDSCH, wherein the other configuration indicates the single packet data convergence protocol layer for both the multicast/broadcast communication and the unicast communication, a single radio link control layer for both the multicast/broadcast communication and the unicast communication, a single medium access control layer for both the multicast/broadcast communication and the unicast communication, the first physical layer for the multicast/broadcast communication, and the second physical layer for the unicast communication; and

receive a third communication via the shared PDSCH based at least in part on the other configuration.

29. The UE of claim 27 , wherein the one or more processors are further configured to transmit uplink feedback, associated with at least one of the first communication or the second communication, using a cell radio network temporary identifier.

30. A network entity for wireless communication, comprising:

a memory; and

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

transmit a configuration for a shared physical downlink shared channel (PDSCH), wherein the configuration indicates a single packet data convergence protocol layer for both a multicast/broadcast communication and a unicast communication, a first radio link control layer associated with a first medium access control layer and a first physical layer for the multicast/broadcast communication, and a second radio link control layer associated with a second medium access control layer and a second physical layer for the unicast communication;

transmit a first communication via the shared PDSCH and a first bearer based at least in part on the configuration, the first communication being one of the unicast communication or the multicast/broadcast communication; and

transmit a second communication via the shared PDSCH and the first bearer or a second bearer based at least in part on the configuration, the second communication being the other of the unicast communication or the multicast/broadcast communication.