Question: What triggers the counting of a successful incoming external intra-MSC handover in a GSM network?
Option 1: Receipt of a "LOCATION UPDATE" message from the UE (User Equipment)
Option 2: Receipt of a "HANDOVER COMPLETE" Message from the BSC (Base Station Controller)
Option 3: Successful establishment of a new dedicated channel for the handed-over UE
Option 4: Sending of a "HANDOVER REQUEST" to the target cell by the source BSC
Explanation: The correct answer is Option 2 because, according to GSM performance management principles, the successful completion of a handover is confirmed when the network receives a "HANDOVER COMPLETE" message from the BSC, indicating that the UE has successfully handed over to the target cell. This confirmation is crucial for accurately counting successful handovers, which is vital for assessing network performance and handover efficiency.