Question: In a split gNB architecture, what triggers the gNB-CU-CP to send a TRACE START message for MDT measurement aligned with QoE measurement to both gNB-CU-UP and gNB-DU?
Option 1: Periodic network performance evaluation scheduled by the Network Management System (NMS)
Option 2: Handover of User Equipment (UE) from a neighboring cell
Option 3: Reception of QoE measurement session start indication from the UE (User Equipment)
Option 4: Congestion detection in the Radio Access Network (RAN) requiring immediate optimization
Explanation: The gNB-CU-CP sends a TRACE START message for MDT measurement aligned with QoE measurement after receiving a QoE measurement session start indication from the UE, initiating coordinated performance assessment and optimization.