Question: In E-UTRAN, what is the primary purpose of the UE Context Reference at Source Information Element (IE) over an NG interface?
Option 1: To authenticate User Equipment (UE) across different Radio Access Technologies (RATs)
Option 2: To prioritize Quality of Service (QoS) for UE with high-priority sessions
Option 3: To facilitate node-internal data forwarding during inter-system handover to 4G in shared gNB/eNB scenarios
Option 4: To manage mobility between different Tracking Areas (TAs) within the same network
Explanation: The UE Context Reference at Source IE's role is to enable seamless handovers by facilitating node-internal data forwarding, crucial in shared eNB/gNB scenarios for ensuring service continuity during inter-system handovers to 4G networks.