Question: In a dual connectivity scenario with Master eNodeB (MeNB) and Secondary gNodeB (SgNB), what happens to the Data Radio Bearers (DRBs) offloaded between the User Equipment (UE) and the SgNB during the UE's RRC re-establishment procedure with the MeNB?
Option 1: The DRBs are automatically re-established with the SgNB after the RRC re-establishment is complete.
Option 2: The DRBs offloaded to the SgNB remain active, but new ones cannot be offloaded until the procedure is finished.
Option 3: The MeNB takes over all DRB responsibilities from the SgNB for the duration of the RRC re-establishment.
Option 4: The DRBs offloaded between the UE and the SgNB are released, requiring SgNB addition (as specified in related procedures) to offload them again if desired.
Explanation: In dual connectivity scenarios, when a UE undergoes RRC re-establishment with the MeNB, any previously offloaded DRBs between the UE and the SgNB are terminated. This is because the control plane functions reside with the MeNB, which manages such connections. After successful re-establishment, if the MeNB still wishes to offload DRBs to the SgNB, an additional procedure (SgNB addition) must be performed, highlighting the temporary nature of the release and the need for reconfiguration post-recovery.