Question: In UTRAN Iub interface, what triggers a Node B to report the result of Cell Synchronization measurements using the NBAP signalling protocol?
Option 1: Periodic synchronization checks initiated by the Node B itself.
Option 2: Handover requests from adjacent cells.
Option 3: Changes in UE (User Equipment) location updates.
Option 4: Receipt of Cell Synchronisation Initiation or Cell Synchronisation Reconfiguration procedure from the CRNC (Controlling RNC).
Explanation: The correct answer is Option 4 because a Node B reports cell synchronization measurement results in response to specific requests from the Controlling RNC (CRNC), made through either Cell Synchronisation Initiation or Cell Synchronisation Reconfiguration procedures, ensuring the CRNC can manage and optimize network synchronization.