Question: Under which of the following conditions can the network initiate an RRC connection release procedure to transition a UE from RRC_CONNECTED to RRC_INACTIVE, based on established bearers?
Option 1: Only if SRB1 is setup in RRC_CONNECTED
Option 2: If no bearers are established in RRC_CONNECTED
Option 3: If only SRB2 is setup in RRC_CONNECTED without any DRB or multicast MRB
Option 4: If SRB2 and at least one DRB, multicast MRB, or specific bearers for IAB and NCR (SRB2) are setup in RRC_CONNECTED
Explanation: The correct answer is Option 4 because, according to the specifications, transitioning a UE from RRC_CONNECTED to RRC_INACTIVE via an RRC connection release procedure requires that SRB2 and at least one Data Radio Bearer (DRB), multicast Media Delivery (MRB), or for specific cases like Integrated Access Backhaul (IAB) and Non-Campus Networks (NCR), SRB2, are established in the RRC_CONNECTED state. This ensures a controlled release of resources while maintaining necessary connectivity configurations.