Albert Rafetseder

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—Content Distribution Networks serve a large share of today's Internet traffic from a multitude of locations, each in relative proximity to the respective consumers. In this paper, we analyze the performance of the YouTube video platform using Seattle, a distributed Internet testbed running on donated resources (like SETI@home), including equipment on the(More)
Applications such as software updaters or a runaway web app, even if low priority, can cause performance degradation , loss of battery life, or other issues that reduce a computing device's availability. The core problem is that OS resource control mechanisms unevenly apply unco-ordinated policies across different resources. This paper shows how handling(More)
—Mobile devices today, such as smartphones and tablets, have become both more complex and diverse. This paper presents a framework to evaluate the trustworthiness of the individual components in a mobile system, as well as the entire system. The major components are applications, devices and networks of devices. Given this diversity and multiple levels of a(More)
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(More)
—In this paper, we present a generic framework for performance evaluation of video streams. We embrace the perspective of a streaming application, and model the playback buffer level at given network and playback conditions. That way, our model enables flexible, adaptable evaluation of a wide variety of streaming methods and protocols. We test our model on(More)
The Internet today consist of many heterogeneous infras-tructures, owned and maintained by separate and potentially competing administrative authorities. On top of this a wide variety of applications has different requirements with regard to quality, reliability and security from the underlying networks. The number of stakeholders who participate in(More)
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