Monitoring multicast broadcast control information
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a notification of a change to multicast broadcast (MB) control information associated with at least one MB service to which the UE is subscribed, the MB control information being included in an MB control channel (MBCCH) scheduled by a physical downlink control channel (PDCCH) communication addressed to an MB radio network temporary identifier (MB-RNTI); and monitor one or more resources of the MBCCH to receive updated MB control information based at least in part on receiving the notification of the change to the MB control information. Numerous other aspects are provided.
1. 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 physical downlink control channel (PDCCH) communication, addressed to a multicast broadcast (MB) radio network temporary identifier (MB-RNTI), that includes a notification of a change to MB control information associated with at least one MB service to which the UE is subscribed, the notification of the change including a bitmap, bits of the bitmap corresponding to one of respective MB control channels (MBCCHs) associated with respective MB services, or MB services associated with a single MBCCH; and
monitor one or more resources of an MBCCH scheduled by the PDCCH to receive updated MB control information based at least in part on receiving the notification of the change to the MB control information.
2. The UE of claim 1 , wherein the MBCCH is the single MBCCH and is used to transmit MB control information for all MB services associated with a service area of the UE.
3. The UE of claim 2 , wherein the notification is triggered based at least in part on a change to any MB service associated with a service area of the UE.
4. The UE of claim 2 , wherein the single MBCCH is associated with multiple sets of MB services and a separate MB control information change notification is associated with each of the multiple sets of MB services.
5. The UE of claim 4 , wherein the one or more processors are further configured to:
receive an MB control information change notification associated with an MB service to which the UE is not subscribed; and
refrain from monitoring for updated MB control information based at least in part on receiving the MB control information change notification associated with the MB service to which the UE is not subscribed.
6. The UE of claim 1 , wherein the MBCCH is one of multiple MBCCHs, each of the multiple MBCCHs being associated with a different set of MB services.
7. The UE of claim 6 , wherein a separate MB control information change is associated with each of the multiple MBCCHs.
8. The UE of claim 7 , wherein the one or more processors are further configured to:
receive an MB control information change notification associated with an MBCCH that is associated with a set of MB services to which the UE is not subscribed; and
refrain from monitoring for updated MB control information based at least in part on receiving the MB control information change notification associated with the MBCCH that is associated with a set of MB services to which the UE is not subscribed.
9. The UE of claim 6 , wherein at least two MBCCHs of the multiple MBCCHs are associated with a same MB-RNTI.
10. The UE of claim 9 , wherein different MBCCHs, of the at least two MBCCHs that are associated with the same MB-RNTI, are associated with different non-overlapping scheduling windows, different hybrid automatic repeat request processes, different logical channel identifiers, or a combination thereof.
11. The UE of claim 6 , wherein at least two MBCCHs of the multiple MBCCHs are associated with different MB-RNTIs.
12. The UE of claim 6 , wherein at least two MBCCHs of the multiple MBCCHs correspond to different bandwidth part configurations.
13. The UE of claim 6 , wherein the one or more processors are further configured to:
receive a configuration message that indicates respective sets of MB services corresponding to each of the multiple MBCCHs; and
monitor the MBCCH based at least in part on the configuration message.
14. The UE of claim 1 , wherein the one or more processors are further configured to:
receive an indication of a new MB service; and
monitor the one or more resources of the MBCCH to receive the updated MB control information based at least in part on receiving the indication of the new MB service.
15. The UE of claim 1 , wherein the PDCCH communication addressed to the MB-RNTI includes an indication of whether the PDCCH communication includes scheduling information for the MBCCH and not the notification of the change, includes the notification of the change and not the scheduling information, or includes both the scheduling information and the notification of the change.
16. The UE of claim 1 , wherein the bitmap includes a bit to indicate a new MB service.
17. The UE of claim 1 , wherein the one or more processors are further configured to:
receive an indication of one or more resources that carry the notification of the change to the MB control information; and
monitor the one or more resources that carry the notification of the change to the MB control information.
18. The UE of claim 1 , wherein another notification of the change to the MB control information is received by the UE in a message addressed to a different RNTI than the MB-RNTI to which the PDCCH communication is addressed.
19. A method of wireless communication performed by a user equipment (UE), comprising:
receiving a physical downlink control channel (PDCCH) communication, addressed to a multicast broadcast (MB) radio network temporary identifier (MB-RNTI), that includes a notification of a change to MB control information associated with at least one MB service to which the UE is subscribed, the notification of the change including a bitmap, bits of the bitmap corresponding to one of respective MB control channels (MBCCHs) associated with respective MB services, or MB services associated with a single MBCCH; and
monitoring one or more resources of an MBCCH scheduled by the PDCCH to receive updated MB control information based at least in part on receiving the notification of the change to the MB control information.
20. The method of claim 19 , wherein the MBCCH is the single MBCCH and is used to transmit MB control information for all MB services associated with a service area of the UE.
21. The method of claim 20 , wherein the notification is triggered based at least in part on a change to any MB service associated with a service area of the UE.
22. The method of claim 20 , wherein the single MBCCH is associated with multiple sets of MB services and a separate MB control information change notification is associated with each of the multiple sets of MB services.
23. The method of claim 22 , further comprising:
receiving an MB control information change notification associated with an MB service to which the UE is not subscribed; and
refraining from monitoring for updated MB control information based at least in part on receiving the MB control information change notification associated with the MB service to which the UE is not subscribed.
24. The method of claim 19 , wherein the MBCCH is one of multiple MBCCHs, each of the multiple MBCCHs being associated with a different set of MB services.
25. The method of claim 24 , wherein a separate MB control information change is associated with each of the multiple MBCCHs.
26. The method of claim 25 , further comprising:
receiving an MB control information change notification associated with an MBCCH that is associated with a set of MB services to which the UE is not subscribed; and
refraining from monitoring for updated MB control information based at least in part on receiving the MB control information change notification associated with the MBCCH that is associated with a set of MB services to which the UE is not subscribed.
27. The method of claim 19 , further comprising:
receiving an indication of one or more resources that carry the notification of the change to the MB control information; and
monitoring the one or more resources that carry the notification of the change to the MB control information.
28. The method of claim 19 , wherein another notification of the change to the MB control information is received by the UE in a message addressed to a different RNTI than the MB-RNTI to which the PDCCH communication is addressed.
29. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
receive a physical downlink control channel (PDCCH) communication, addressed to a multicast broadcast (MB) radio network temporary identifier (MB-RNTI), that includes a notification of a change to MB control information associated with at least one MB service to which the UE is subscribed, the notification of the change including a bitmap, bits of the bitmap corresponding to one of respective MB control channels (MBCCHs) associated with respective MB services, of MB services associated with a single MBCCH; and
monitor one or more resources of an MBCCH scheduled by the PDCCH to receive updated MB control information based at least in part on receiving the notification of the change to the MB control information.
30. An apparatus for wireless communication, comprising:
means for receiving a physical downlink control channel (PDCCH) communication, addressed to a multicast broadcast (MB) radio network temporary identifier (MB-RNTI), that includes a notification of a change to MB control information associated with at least one MB service to which the apparatus is subscribed, the notification of the change including a bitmap, bits of the bitmap corresponding to one of respective MB control channels (MBCCHs) associated with respective MB services, or MB services associated with a single MBCCH; and
means for monitoring one or more resources of an MBCCH scheduled by the PDCCH to receive updated MB control information based at least in part on receiving the notification of the change to the MB control information.