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    Item type:Publication, Access status: without files ,
    A novel LTE wireless virtualization framework
    (Springer, 2011-09-26)
    Zaki, Yasir
    ;
    Zhao, Liang
    ;
    Görg, Carmelita
    ;
    Timm-Giel, Andreas
    Network virtualization is one of the topics that recently have been receiving attention in the research community. It is becoming evidently clear that network virtualization will be a major player in the shaping of the Future Internet. Many research projects around the world are studying different aspects of network virtualization: some are focusing on resource virtualization like Node, Server and Router virtualization; while others are focusing on building a framework to setup virtual networks on the fly based on the different virtual resources. In spite of all that work, we still think that one very important piece of the puzzle is still missing that is "Wireless Virtualization" . According to the best of our knowledge, the virtualization of the wireless medium has not yet received the appropriate attention it is entitled to, and there has been very small work done in that field. This is why this paper is proposing a framework for the virtualization of the wireless medium. This framework is proposed to virtualize mobile communication systems so that multiple operators can share the same physical resources. We mainly focus on the Long Term Evolution (LTE) but the framework can also be generalized to fit any other wireless system.
    Publicationtype: Conference Paper
      21
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    Item type:Publication, Access status: without files ,
    End-to-end performance evaluation of virtual networks using a prototype implementation
    (Springer, 2011-09-26)
    Udugama, Asanga
    ;
    Zhao, Liang
    ;
    Zaki, Yasir
    ;
    Görg, Carmelita
    ;
    Timm-Giel, Andreas
    Network virtualization is a concept where physical resources are used to create virtual resources that are combined to form virtual networks. As one of the key enablers of the future Internet, network virtualization solves a number of issues associated with today's networks. Concepts of network virtualization that are not restricted to virtualization technology, termed as overall concepts that include roles of parties and deployment aspects are currently being defined in different research activities. An area that lack attention is the evaluation of performance in prototypes that consider these overall concepts of network virtualization. The work presented here discusses and presents the performance in a network virtualization prototype that considers these overall concepts.
    Publicationtype: Conference Paper
      24
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    Item type:Publication, Access status: without files ,
    Generic connectivity architecture for mobility and multipath flow management in the future internet
    (Springer, 2011-09-26)
    Singh, Amanpreet
    ;
    Nass, Christoph
    ;
    Timm-Giel, Andreas
    ;
    Schefczik, Peter
    ;
    Roessler, Horst
    With the evolution of the Internet, the vast majority of the traffic is generated by information-centric applications, which would benefit from enhanced data transport paradigms. This paper presents the development and implementation of the Generic Connectivity architecture, a new communication flow abstraction that is based on the Generic Path architecture developed within the European Research Project 4WARD. The Generic Connectivity mechanisms allow for a high degree of flexibility by covering both existing and new protocol paradigms, which are particularly beneficial for wireless access networks. This paper shows that the Generic Connectivity architecture can realize new network mechanisms beyond the features of the current Internet protocol architecture. It is thus a promising clean-slate approach for the Future Internet. The relevant aspects of the architecture are implemented with the OMNET++ 4.0 network simulation tool. Using simulations, the advantages of the Generic Connectivity architecture are shown for several new use cases, including an adaptive protocol selection, mobility, multicast and multipath connectivity over heterogeneous wireless networks. Furthermore, it is also demonstrated that the architecture inherently supports guaranteed Quality-of-Service (QoS) agreements and traffic distribution over dynamic channels.
    Publicationtype: Conference Paper
      27