Question: In E-UTRAN, how can the subscription information indicating support of Aerial UE function be transferred from the source cell to the target cell during an X2-based handover?
Option 1: Via S1-AP Initial Context Setup Request from MME to target eNB
Option 2: Included in the X2-AP Handover Request message from source eNodeB to target eNodeB
Option 3: Through a direct update from HSS to the target eNodeB
Option 4: Provided by the UE in a dedicated signaling message during handover execution
Explanation: During an X2-based handover, direct communication between eNodeBs allows for efficient transfer of necessary context information. Including Aerial UE support in the X2-AP Handover Request enables the target eNodeB to adapt promptly without delaying the process with additional signaling to/from the MME or HSS, optimizing handover performance and connectivity for aerial UEs.