Question: What action may a Master eNodeB (MeNB) take if it is aware that a Secondary eNodeB (SeNB) didn't receive the latest configuration information concerning the Master Cell Group (MCG) during a SeNB modification procedure?
Option 1: Send an updated MCG configuration to the SeNB without altering the ongoing procedure.
Option 2: Trigger a UE context refresh towards the SeNB to ensure alignment.
Option 3: Respond with a SENB MODIFICATION REFUSE message to the SeNB, including an appropriate cause value in the Cause Information Element (IE).
Option 4: Automatically initiate a handover of the UE to another SeNB.
Explanation: This is because if the MeNB is aware that the SeNB didn’t receive the latest MCG configuration, responding with a SENB MODIFICATION REFUSE message (with an appropriate cause) is a specified action in such scenarios, allowing for graceful procedure termination and potential re-initiation with corrected information. This aligns with managing abnormal conditions efficiently in E-UTRAN operations.