Question: In the context of Evolved Packet Core (EPC) network Performance Management, what triggers the increment of the 'Failed routeing area update with MME interaction and without S-GW change' measurement, specifically for its subcounters?
Option 1: Receipt of a 'Context Acknowledge' message indicating SGW change.
Option 2: Transmission of a 'Context Response' message with a Cause value other than 'Request Accepted', followed by a 'Context Acknowledge' message confirming no SGW change.
Option 3: Successful completion of the routeing area update procedure.
Option 4: Detection of a UE (User Equipment) context without an assigned S-GW.
Explanation: The correct trigger for incrementing this measurement's subcounters involves the transmission of a 'Context Response' message with a rejected Cause value (not 'Request Accepted'), subsequently confirmed by a 'Context Acknowledge' message that indicates no change in the S-GW. This scenario aligns with the specified conditions for measuring failed routeing area updates with MME interaction but without an S-GW change, as per EPC network performance management guidelines.