This paper takes an initial look on the signaling behavior of mobile devices in mobile cellular core networks. In contrast to most contributions in this field, our focus does not lie on the wireless or user-oriented parts of the network, but on signaling in the core network. We evaluate GTP Tunnel Management signaling messages on the path between SGSN and GGSN, and the overhead imposed on user plane traffic. Furthermore, we attempt to correlate PDP Context durations to device specific parameters such as device class or operating system. From the context durations, we estimate the signaling overhead devices burden on the core network.

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