Question: Which of the following mobility management procedures is primarily used to inform the target NG-RAN node about the success of a handover, after the UE has accessed the target cell?
Option 1: Handover Preparation
Option 2: Handover Success Indication
Option 3: Retrieve UE Context
Option 4: Conditional Handover Cancel
Explanation: The Handover Success Indication is a crucial procedure in mobility management, specifically designed to notify the target NG-RAN node that the handover has been successfully completed from the UE's perspective, after it has accessed the target cell. This confirmation is essential for the network to update the UE's location and manage resources efficiently. In contrast, Handover Preparation initiates the handover process, Retrieve UE Context is about obtaining the UE's context from another node, and Conditional Handover Cancel is related to cancelling a handover under specific conditions, none of which directly relate to confirming the success of a handover after the UE accesses the target cell.