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Suche nach „[Fischer] [Andreas]“ hat 46 Publikationen gefunden
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    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    M. Beck, Andreas Fischer, H. Meer, J. Botero, X. Hesselbach

    A distributed, parallel, and generic virtual network embedding framework

    IEEE International Conference on Communications (ICC 2013) [Budapest, Hungary; June 9-13, 2013]

    DOI: 10.1109/ICC.2013.6655087

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    M. Beck, Andreas Fischer, F. Kokot, C. Linnhoff-Popien, H. Meer

    A Simulation Framework for Virtual Network Embedding Algorithms

    Proceedings of the 16th International Telecommunications Network Strategy and Planning Symposium (Networks 2014) [Funchal, Madeira Island, Portugal; September 17-19, 2014]

    DOI: 10.1109/NETWKS.2014.6959238

    Abstract anzeigen

    Network virtualization is seen as an enabling technology for the Future Internet. In this context, many Virtual Network Embedding algorithms have been introduced in literature so far. This paper discusses an open source framework for the evaluation of such algorithms. The paper describes features provided by the framework, how to use the framework for evaluating these algorithms, and how to extend the software with respect to novel algorithms and simulation scenarios. Lessons learned are presented, describing how the software evolved towards a mature and highly extensible simulation framework.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    M. Beck, Andreas Fischer, H. Meer

    Distributed Virtual Network Embedding

    Proceedings of the 7th GI/ITG KuVS Workshop on Future Internet

    Abstract anzeigen

    Network virtualization applies virtualization concepts to network resources in order to provide an abstraction from specific hardware. The added flexibility manifests itself in the possibility to create arbitrarily structured virtual networks that do not necessarily have to reflect the topology or the properties of the underlying physical network. The problem of mapping virtual resources to physical resources in such an environment is commonly known as ,,Virtual Network Embedding”, and almost all existing embedding algorithms do this in a centralized manner. The exploitation of distributed approaches aims to improve performance and to increase the level of reliability: stability and scalability of the whole system should be ensured. In this work, we present our ideas how to build such a new approach.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    J. Rubio-Loyola, A. Galis, A. Astorga, J. Serrat, L. Lefevre, Andreas Fischer, A. Paler, H. Meer

    Scalable Service Deployment on Software Defined Networks

    IEEE Communications Magazine, vol. 49, no. 12, pp. 84-93

    DOI: 10.1109/MCOM.2011.6094010

    Abstract anzeigen

    The network of the future will require a greater degree of service-awareness, and an optimal use of network resources. This paper presents the architectural design developed in the AutoI project for an open software-defined network infrastructure that enables the composition of fast and guaranteed services in an efficient manner and the execution of these services in an adaptive way taking into account better shared network resources provided by network virtualisation. Validation results are provided with special emphasis on service deployment scalability over virtualized network infrastructures.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    A. Paler, Andreas Fischer

    vCPI – virtual Component Programming Interface

    Praxis der Informationsverarbeitung und Kommunikation, vol. 34, no. 3, pp. 142-143

    DOI: 10.1515/piko.2011.028

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    G. Marias, J. Barros, M. Fiedler, Andreas Fischer, H. Hauff, R. Herkenhoener, A. Grillo, A. Lentini, L. Lima, C. Lorentzen, W. Mazurczyk, H. Meer, P. Oliveira, G. Polyzos, E. Pujol, K. Szczypiorski, J. Vilela, T.T.V. Vinhoza

    Security and Privacy issues for the Network of the Future

    Security and Communication Networks, vol. 5, no. 9, pp. 987-1005

    DOI: 10.1002/sec.384

    Abstract anzeigen

    The vision towards the Network of the Future cannot be separated from the fact that today’s networks, and networking services are subject to sophisticated and very effective attacks. When these attacks first appeared, spoofing and distributed denial-of-service attacks were treated as apocalypse for networking. Now, they are considered moderate damage, whereas more sophisticated and inconspicuous attacks, such as botnets activities, might have greater and far reaching impact. As the Internet is expanding to mobile phones and ‘smart dust’ and as its social coverage is liberalized towards the realization of ubiquitous computing (with communication), the concerns on security and privacy have become deeper and the problems more challenging than ever. Re-designing the Internet as the Network of the Future is self-motivating for researchers, and security and privacy cannot be provided again as separate, external, add-on, solutions. In this paper, we discuss the security and privacy challenges of the Network of the Future and try to delimit the solutions space on the basis of emerging techniques. We also review methods that help the quantification of security and privacy in an effort to provide a more systematic and quantitative treatment of the area in the future.

    Elektrotechnik und Medientechnik

    Vortrag

    G. Lovász, Andreas Fischer, H. Meer

    Network Virtualization and Energy Efficiency

    9th Würzburg Workshop on IP: Joint ITG and Euro-NF Workshop on Visions of Future Generations Networks (EuroView 2009), Würzburg, Germany

    DigitalElektrotechnik und Medientechnik

    Patent

    A. Houyou, Andreas Fischer, W. Mandarawi, H. Meer, H.-P. Huth

    Device and method for allocating communication resources in a system employing network slicing

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Fischer, Hermann Meer

    Position Paper: Secure Virtual Network Embedding

    Praxis der Informationsverarbeitung und Kommunikation, vol. 34, no. 4, pp. 190-193

    DOI: 10.1515/piko.2011.040

    Abstract anzeigen

    Network virtualization has been recognized as an important technique to overcome the perceived ossification of the current Internet. Several variations of network virtualization have already been discussed in the literature. These approaches use virtualization to partition and/or combine physical network resources into virtual network resources. An actual deployment of virtual networks then requires the network operator to perform a mapping of virtual resources onto physical resources. The question of how this mapping can be performed in an optimal way is commonly known as the Virtual Network Embedding (VNE) problem. Several algorithms to solve this problem have been proposed already. These algorithms, however, focus on optimizing the use of resources with regard to performance. Security constraints to the VNE problem have not been investigated in depth, so far.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Fischer, H. Meer

    Generating Virtual Network Embedding Problems with Guaranteed Solutions

    IEEE Transactions on Network and Service Management, vol. 13, no. 3, pp. 1-14

    DOI: 10.1109/TNSM.2016.2596802

    Abstract anzeigen

    The efficiency of network virtualization depends on the appropriate assignment of resources. The underlying problem, called Virtual Network Embedding, has been much discussed in the literature, and many algorithms have been proposed, attempting to optimize the resource assignment in various respects. Evaluation of those algorithms requires a large number of randomly generated embedding scenarios. This paper presents a novel scenario generation approach and demonstrates how to produce scenarios with a guaranteed exact solution, thereby facilitating better evaluation of embedding algorithms.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Fischer, J. Botero, M. Duelli, D. Schlosser, X. Hesselbach, H. Meer, T. Margaria, J. Padberg, G. Taentzer, H. Hellbrück, N. Luttenberger, V. Turau

    ALEVIN - A Framework to Develop, Compare, and Analyze Virtual Network Embedding Algorithms

    Electronic Communications of the EASST, vol. 37, pp. 1-12

    Abstract anzeigen

    Network virtualization is recognized as an enabling technology for the Future Internet. Applying virtualization of network resources leads to the problem of mapping virtual resources to physical resources, known as “Virtual Network Embedding” (VNE). Several algorithms attempting to solve this problem have been discussed in the literature, so far. However, comparison of VNE algorithms is hard, as each algorithm focuses on different criteria. To that end, we introduce a framework to compare different algorithms according to a set of metrics, which allow to evaluate the algorithms and compute their results on a given scenario for arbitrary parameters.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Fischer, J. Botero, Michael Beck, H. Meer, X. Hesselbach

    Virtual Network Embedding: A Survey

    IEEE Communications Surveys and Tutorials, vol. 15, no. 4, pp. 1888-1906

    DOI: 10.1109/SURV.2013.013013.00155

    Abstract anzeigen

    Network virtualization is recognized as an enabling technology for the future Internet. It aims to overcome the resistance of the current Internet to architectural change. Application of this technology relies on algorithms that can instantiate virtualized networks on a substrate infrastructure, optimizing the layout for service-relevant metrics. This class of algorithms is commonly known as “Virtual Network Embedding (VNE)” algorithms. This paper presents a survey of current research in the VNE area. Based upon a novel classification scheme for VNE algorithms a taxonomy of current approaches to the VNE problem is provided and opportunities for further research are discussed.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    Andreas Fischer

    Performance Evaluation for Service Function Chains through Automated Model Building

    Proceedings of the 11th EAI International Conference on Performance Evaluation Methodologies and Tools (ValueTools2017) [Venice, Italy; December 5-7, 2017]

    DigitalElektrotechnik und Medientechnik

    Hochschulschrift

    Andreas Fischer

    An Evaluation Methodology for Virtual Network Embedding

    Abstract anzeigen

    The increasing scale and complexity of computer networks imposes a need for highly flexible management mechanisms. The concept of network virtualization promises to provide this flexibility. Multiple arbitrary virtual networks can be constructed on top of a single substrate network. This allows network operators and service providers to tailor their network topologies to the specific needs of any offered service. However, the assignment of resources proves to be a problem. Each newly defined virtual network must be realized by assigning appropriate physical resources. For a given set of virtual networks, two questions arise: Can all virtual networks be accommodated in the given substrate network? And how should the respective resources be assigned? The underlying problem is commonly known as the Virtual Network Embedding problem. A multitude of algorithms has already been proposed, aiming to provide solutions to that problem under various constraints. For the evaluation of these algorithms typically an empirical approach is adopted, using artificially created random problem instances. However, due to complex effects of random problem generation the obtained results can be hard to interpret correctly. A structured evaluation methodology that can avoid these effects is currently missing. This thesis aims to fill that gap. Based on a thorough understanding of the problem itself, the effects of random problem generation are highlighted. A new simulation architecture is defined, increasing the flexibility for experimentation with embedding algorithms. A novel way of generating embedding problems is presented which migitates the effects of conventional problem generation approaches. An evaluation using these newly defined concepts demonstrates how new insights on algorithm behavior can be gained. The proposed concepts support experimenters in obtaining more precise and tangible evaluation data for embedding algorithms.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    J. Botero, X. Hesselbach, Andreas Fischer, H. Meer

    Optimal mapping of virtual networks with hidden hops

    Telecommunications Systems: Special Issue on Future Internet Services and Architectures (Trends and Visions), vol. 51, no. 4, pp. 273-282

    DOI: 10.1007/s11235-011-9437-0

    Abstract anzeigen

    Network Virtualization has emerged as a so-lution for the Internet inability to address the requiredchallenges caused by the lack of coordination amongInternet service providers for the deployment of newservices. The allocation of resources is one of the mainproblems in network virtualization, mainly in the map-ping of virtual nodes and links to specific substratenodes and paths, also known as the virtual networkembedding problem. This paper proposes an algorithmbased on optimization theory, to map the virtual linksand nodes requiring a specific demand, looking for themaximization of the spare bandwidth and spare CPUin the substrate network, taking into account the band-width demanded by thehidden hopswhen a virtuallink is mapped. The components of the virtual networks(nodes and links) that do not ask for an specific demandare then allocated following a fairness criteria.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    J. Botero, X. Hesselbach, M. Duelli, D. Schlosser, Andreas Fischer, H. Meer

    Energy Efficient Virtual Network Embedding

    IEEE Communications Letters, vol. 16, no. 5, pp. 756-759

    DOI: 10.1109/LCOMM.2012.030912.120082

    Abstract anzeigen

    Waste of energy due to over-provisioning and overdimensioning of network infrastructures has recently stimulated the interest on energy consumption reduction by Internet Service Providers (ISPs). By means of resource consolidation, network virtualization based architectures will enable energy saving. In this letter, we extend the well-known virtual network embedding problem (VNE) to energy awareness and propose a mixed integer program (MIP) which provides optimal energy efficient embeddings. Simulation results show the energy gains of the proposed MIP over the existing cost-based VNE approach.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Berl, Andreas Fischer, H. Meer

    Virtualisierung im Future Internet - Virtualisierungsmethoden und Anwendungen

    Informatik-Spektrum, vol. 33, no. 2, pp. 186-194

    DOI: 10.1007/s00287-010-0420-z

    Abstract anzeigen

    Das Future Internet stellt sich der Herausforderung, die Verknöcherung und die Unzulänglichkeiten des heutigen Internets zu überwinden. Es soll beispielsweise robust, zuverlässig und fehlertolerant sein und dabei Dienste auf energieeffiziente Weise erbringen. Zusätzlich müssen auch neue Anforderungen antizipiert werden, die zukünftige Dienste und Netze stellen, um der Entwicklung von neuen Diensten und Protokollen nicht im Wege zu stehen. Erforderlich ist hierbei die Entwicklung einer äußerst variablen und rekonfigurierbaren Netzwerkarchitektur, die eine möglichst einfache und autonome Netzwerkverwaltung mit einschließt. Die Virtualisierung von Host- und Netzwerkressourcen stellt in diesem Zusammenhang eine der Schlüsseltechnologien dar, mit der diese notwendige Flexibilität erreicht werden kann. Virtualisierung verbirgt die Komplexität von physikalischen Netzwerkinfrastrukturen und stellt homogene, flexible und dynamisch rekonfigurierbare virtuelle Ressourcen zur Verfügung. Dieser Artikel gibt einen Überblick über verschiedene Host- und Netzwerkvirtualisierungsmethoden. An mehreren Beispielen wird aufgezeigt, wie verschiedene Herausforderungen angegangen werden können, die sowohl im heutigen Internet als auch im Internet der Zukunft eine Rolle spielen.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    M. Beck, Andreas Fischer, J. Botero, C. Linnhoff-Popien, H. Meer

    Distributed and scalable embedding of virtual networks

    Journal of Network and Computer Applications, vol. 56, no. October, pp. 124-136

    DOI: 10.1016/j.jnca.2015.06.012

    Abstract anzeigen

    Abstract Network virtualization is widely regarded as a key technology for the Future Internet, enabling the deployment of new network protocols without changing dissimilar hardware devices. This leads to the problem of mapping virtual demands to physical resources, known as Virtual Network Embedding (VNE). Current VNE algorithms do not scale with respect to the substrate network size. Therefore, these algorithms are not applicable in large-scale scenarios where virtual networks have to be embedded in a timely manner. This paper discusses DPVNE, a Distributed and Generic VNE framework: It runs cost-oriented centralized embedding algorithms in a distributed way, spreading workload across the substrate network instead of concentrating it on one single node (as centralized algorithms do). Several state-of-the-art algorithms were evaluated running inside the DPVNE framework. Results show that DPVNE leads to runtime improvements in large-scale scenarios and embedding results are kept comparable.

    Elektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    Andreas Berl, Andreas Fischer, H. Meer, A. Galis, J. Rubio-Loyola

    Management of Virtual Networks

    Middleware technologies for enabling next generation network services and applications (Samos Island, Greece, 22nd - 26th September 2008; Proceedings of the 5th International Workshop on Next Generation Networking Middleware (NGNM 2008) and 4th IEEE/IFIP International Workshop on End-to-end Virtualization and Grid Management (EVGM 2008)), Schöneiche bei Berlin, vol. No. 9

    ISBN: 978-3930736126

    Elektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    Andreas Fischer, Andreas Berl, H. Meer

    Virtual Network Management with XEN

    Tagungsband Herbsttreffen 2008 der GI/VTG Fachgruppe Betriebssysteme und KuVS (Oktober 2008; Garching)