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Adaptive video playing methods are mainly based on solutions involving the usage of HTTP together with TCP in the transport layer. However, TCP no longer seems to be the only solution. Other transport protocols (e.g., UDP) with different transport features (e.g., new error correction techniques) are also possible candidates. In this demo we demonstrate a flexible media delivery framework which is...
HTTP has been the protocol for transferring web traffic over the Internet since the 90s. However, over the past 20 years websites have evolved so much that today this protocol does not provide optimal delivery over the Internet and became a bottleneck in decreasing page load times. Google is pioneering in finding better solutions for downloading web pages and they implemented two new protocols: SPDY...
The technology of light-sensitive amorphous chalcogenide layers, made from As-Ge-Se raw glasses, thick layers of acrylic polymers, made from mixture of isomers as well as two types of nanocomposites of these materials with gold nanoparticles was developed. These layers were used for direct, one-step surface geometrical and optical (amplitude-phase) relief recording by laser- or electron-beams. Investigations...
The volume of Internet traffic has been growing exponentially in the last years, and this trend is expected to intensify in the future. In typical backbone networks hundreds of thousands of flows, originated from different users and versatile applications, compete for the available resources. Such a heterogeneous mixture of traffic flows leads to a continuously changing environment, hence it is crucial...
In the recent years, a significant research effort has been devoted to the development of bandwidth estimation techniques and tools due to the broad range of possible applications. The vast majority of bandwidth estimation algorithms are designed and optimized for wired networks. Therefore, these solutions not only provide inaccurate results in wireless environments but also rely on some information...
One of the key questions for future networks is how to efficiently transfer data traffic generated by versatile applications in heterogeneous and fast changing environments. The lesson learned from the history of the Internet is that congestion control performed by TCP can be a solution. However, due to the limitations of TCP versions a novel paradigm applying fountain code based transfer seems to...
In this paper we present a performance evaluation study of different transport mechanisms carried out in a testbed environment to reveal their efficiency regarding the transfer of different flows. The current versions of the Transmission Control Protocol (TCP) are compared to the Digital Fountain based Communication Protocol (DFCP), which is our newly developed transport protocol where congestion...
We present the versatile functionality of our novel user behavior based traffic emulation system in this paper. We show the unique feature of the system, i. e., it is capable of working on different platforms (Windows, Android), on different access technologies (wired, WiFi, 3G) and as a remote controlled system on different sites (Europe, Asia, South America). Our examples exhibit some of the manifold...
Network traffic generators are widely used in networking research and they are validated by a very broad range of metrics (mainly traffic characteristics). In this paper we overview the state of the art of these metrics and unveil that there is no consensus in the research community how to validate these traffic generators and which metric to choose for validation purpose. This situation makes it...
We demonstrate a multi-functional and configurable traffic generation framework which is based on accurately capturing user behavior by automatic Graphical User Interface control. The framework includes the emulation of typical user behaviors on remote controlled machines with the recording of their generated traffic. As far as we know this is the first time when a traffic generation tool is demonstrated...
The research history of congestion control protocols has unveiled that it is difficult to find an optimal solution, which meets all the challenges of the evolving Internet. As an alternative paradigm recent studies suggest replacing congestion control with erasure coding techniques. In this paper we present a performance study of this approach comparing it with TCP based solutions. In order to investigate...
In this paper a three-dimensional (size, duration and rate) flow traffic characterization framework is proposed. Detailed investigation of application clusters in the characterization space is discussed. The use of the framework is demonstrated on measured traffic from a commercial network. Conclusions regarding flow clusters related to specific applications are given.
The short-term dynamics of competing high speed TCP flows can have strong impacts on their long-term fairness. This leads to severe problems for both the co-existence and the deployment feasibility of different proposals for the next generation networks. However, to our best knowledge, no root-cause analysis of the observation is available. In this paper, we try to fill this gap by providing an in-depth...
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