Question: What is the primary condition for incrementing the MM.SuccIntraSgsnRaUpdate measurement counter in a Core Network (CN) Packet Switched (PS) domain?
Option 1: Upon receipt of a ROUTING AREA UPDATE REQUEST message from the User Equipment (UE).
Option 2: After successful transmission of a ROUTING AREA UPDATE ACCEPT message to the Mobile Station (MS), confirming an intra-SGSN Routing Area update.
Option 3: When the Serving GPRS Support Node (SGSN) detects a change in the Location Area Code (LAC) or Routing Area Code (RAC) of the UE.
Option 4: Upon completion of a periodic Routing Area update timer in the SGSN, regardless of UE activity.
Explanation: The correct answer is Option 2 because the MM.SuccIntraSgsnRaUpdate measurement specifically counts successfully performed intra-SGSN Routing Area Update procedures. The key indicator of a successful update is the transmission of a ROUTING AREA UPDATE ACCEPT message to the MS, signifying that the update procedure has been accepted and completed.