LTE core network testing using generated traffic based on models from real-life data

The aim of this paper is to describe a general methodology for testing the mobile network core with traffic generated from a simulated access-segment. A main element of this methodology is to derive load models and mobility models from real-life traffic patterns, and use these - as well as prerecorded protocol messages - in the process. The Evolved Packet Core (EPC) of Long Term Evolution (LTE) provides a good base for presenting practical elements of this methodology. This paper demonstrates the workflow of this methodology through a practical example of EPC load testing. This demonstration covers issues related to nodes and interfaces covered during such tests; dialogs used for session and mobility control; and cross-correlating message flows that effect various elements across the architecture.