Question: How is Application Layer Measurement Collection initiated for a specific UE in a signalling-based case?
Option 1: Through OAM (Operations and Maintenance) targeting the specific UE directly.
Option 2: Using the MDT mechanism from CN (Core Network) nodes to the specific UE.
Option 3: Via a broadcast message to all UEs in the cell, which then respond if applicable.
Option 4: Through a direct request from the UE itself to the E-UTRAN for measurement collection.
Explanation: In signalling-based initiation for Application Layer Measurement Collection targeting a specific UE, the process leverages the Minimization of Drive Tests (MDT) mechanism. This is initiated by Core Network (CN) nodes, utilizing MDT protocols to reach the targeted User Equipment (UE), ensuring direct and controlled initiation of measurement collection.