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High quality and sustained multi media experience is expected to be a major feature of the Future Mobile Internet (FMI). Currently deployed novel mobile network technologies such as LTE (Long Term Evolution) make use of the Internet and its best-effort TCP/IP protocol stack to enable applications. The orientation towards TCP/IP is logical due to the success(More)
—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)
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)
—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 recent shift from specialized video streaming solutions to user-friendly Web-based video delivery platforms has attracted large audiences to these platforms. However, this could also result in future bandwidth bottlenecks and a degradation of network parameters if traffic demands continue to rise. Due to the reliable TCP protocol the influence of(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)
Smartphones contain sensors that provide information about the user of the device. Studying smartphones, therefore, provides an invaluable window into the behavioral patterns of users. In this work, we describe an open infrastructure that provides research communities with principled access to mobile devices and their sensors. Our platform, the Sensibility(More)