Question: In an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), what is the primary purpose of sending an SN STATUS TRANSFER message between eNBs during handover or for EN-DC (E-UTRA-NR Dual Connectivity)?
Option 1: To synchronize the downlink/uplink MIMO configurations between source and target eNBs.
Option 2: To transfer the uplink/downlink PDCP Sequence Number (SN) and Hyper Frame Number (HFN) status.
Option 3: To initiate or modify a bearer context for a specific User Equipment (UE).
Option 4: To report radio link failure or handover failure to the target eNB.
Explanation: The SN STATUS TRANSFER message is designed to transfer the uplink/downlink PDCP Sequence Number (SN) and Hyper Frame Number (HFN) status, ensuring seamless data transmission continuity during handovers or EN-DC by synchronizing sequence numbers between source and target eNBs, preventing data loss or duplication.