Question: Under what condition(s) may an MBS (Multimedia Broadcast/Multicast Service) capable UE in RRC_CONNECTED state initiate the MBS Interest Indication procedure, specifically in relation to cell changes or broadcast service updates?
Option 1: Upon entering or leaving the broadcast service area, upon MBS broadcast session start/stop, or upon change of interest.
Option 2: Only when the UE connects to a new PCell providing SIB21 or nonServingCellMII in SIB1.
Option 3: Exclusively after receiving SIB20 for an SCell via dedicated signaling or during handover.
Option 4: Upon change of priority between MBS broadcast reception and unicast/multicast reception, upon RRC connection re-establishment, or when subcarrier spacing/CFR information for MBS on a non-serving cell changes.
Explanation: The initiation of the MBS Interest Indication procedure by an MBS capable UE in RRC_CONNECTED state encompasses scenarios directly related to the UE's interest in broadcast services or its geographical/broadcast service area changes, including entering/leaving the broadcast service area, starting/stopping an MBS session, and any change in interest in available MBS services.