Searched for: subject%3A%22PNS%255C%2B%255C-%255C%2BPerformance%255C%2Bof%255C%2BNetworks%255C%2B%2526%255C%2BServices%22
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Ellens, W. (author), Zuraniewski, P.W. (author), Sperotto, A. (author), Schotanus, H.A. (author), Mandjes, M. (author), Meeuwissen, H.B. (author)DNS tunnels allow circumventing access and security policies in firewalled networks. Such a security breach can be misused for activities like free web browsing, but also for command & control traffic or cyber espionage, thus motivating the search for effective automated DNS tunnel detection techniques. In this paper we develop such a technique,...bookPart 2013
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Callegari, C. (author), Coluccia, A. (author), D'alconzo, A. (author), Ellens, W. (author), Giordano, S. (author), Mandjes, M. (author), Pagano, M. (author), Pepe, T. (author), Ricciato, F. (author), Zuraniewski, P.W. (author)In this Chapter we give an overview of statistical methods for anomaly detection (AD), thereby targeting an audience of practitioners with general knowledge of statistics. We focus on the applicability of the methods by stating and comparing the conditions in which they can be applied and by discussing the parameters that need to be set. © 2013...bookPart 2013
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Litjens, R. (author), Gunnarsson, F. (author), Sayrac, B. (author), Spaey, K. (author), Willcock, C. (author), Eisenblätter, A. (author), Rodríguez, B.G. (author), Kürner, T. (author)The development of self-management solutions for (multi-technology, multi-layer) mobile communication networks is driven by their increasing operational complexity. Initial stand-alone SON (Self-Organizing Networks) solutions are already available, but are not sufficient to handle the networks of tomorrow. In this paper we present our approach...conference paper 2013
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Phillipson, F. (author)At this moment consumers want an internet connection with 20-50 Mb/s speed and around 100 Mb/s in the near future. Rolling out Fibre to the Curb networks quickly will be the only way for telecom operators in some countries to compete with cable tv operators. This requires a fibre connection to the cabinets. When the telecom operator wants...bookPart 2013
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Litjens, R. (author), Zhang, H. (author), Noppen, I. (author), Yu, L. (author), Karipidis, E. (author), Börner, K. (author)We assess the system-level performance of nonorthogonal spectrum sharing achieved via maximum sum-rate (SR), Nash bargaining (NB), and zero-forcing (ZF) transmit beamforming techniques. A look-up table based physical layer abstraction and radio resource management mechanisms (including packet scheduling) are proposed and incorporated in system...conference paper 2013
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Živković, M. (author), van den Berg, H. (author)Due to the inherent stochastic nature of services execution environment within service oriented systems, a runtime adaptation of the given composition may be required. We address a runtime service adaptation mechanism based on conditional retries for the orchestrated web services. The conditional retry may be issued while a concrete service...conference paper 2013
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Walraven, F.A. (author), Venemans, P.H.A. (author), in 't Velt, R. (author), Fransen, F. (author)The network of the future consists of a combination of different access networks, each providing a level of network availability and mobility suited for a wide range of applications. Mobile network developments culminated in work on the E-UTRAN and Evolved Packet Core (EPC) network and can provide mobile broadband access to many citizens....conference paper 2013
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Beerends, J.G. (author), Schmidmer, C. (author), Berger, J. (author), Obermann, M. (author), Ullman, R. (author), Pomy, J. (author), Keyhl, M. (author)In this and the companion paper Part II, the authors present the Perceptual Objective Listening Quality Assessment (POLQA), the third-generation speech quality measurement algorithm, standardized by the International Telecommunication Union in 2011 as Recommendation P.863. In contrast to the previous standard (P.862 Perceptual Evaluation of...article 2013
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Beerends, J.G. (author), Schmidmer, C. (author), Berger, J. (author), Obermann, M. (author), Ullman, R. (author), Pomy, J. (author), Keyhl, M. (author)In this and the companion paper Part I, the authors present the Perceptual Objective Listening Quality Assessment (POLQA), the third-generation speech quality measurement algorithm, standardized by the International Telecommunication Union in 2011 as Recommendation P.863. This paper describes the newly developed perceptual model of this standard...article 2013
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Koç, Y. (author), Warnier, M. (author), Kooij, R.E. (author), Brazier, F.M.T. (author)The cascading failure phenomenon in a power grid is related to both the structural aspects (number and types of buses, density of transmission lines and interconnection of components), and the operative state (flow distribution and demand level). Existing studies most often focus on structural aspects, and not on operative states. This paper...article 2013
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Phillipson, F. (author)If an operator has as starting position a Full Copper topology in which ADSL or VDSL is offered from the Central Office, the next choice he has to make is to provide Full FttH or use an other topology option, e.g. FttCab, first as intermediate step to provide a next generation service package. In this paper we present a gradual topology...conference paper 2013
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Phillipson, F. (author)In this paper we present a simple framework for planning options when deploying Fibre to the Curb, using G.Fast as technology. We present a framework of eight possible planning options, roll-out scenarios, coming from three main planning choices. We elaborate the mathematical approach of each of these eight options, using combinations of...conference paper 2013
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Klein Wolterink, W. (author), Heijenk, G. (author), van den Berg, J.L. (author)Piggybacking on beacons is a forwarding technique in vehicular ad-hoc networks (VANET) as a means to disseminate data. With this technique data is attached to and transmitted along with scheduled beacons. Nodes are assumed to beacon asynchronously. In this paper we present a first version of an analytical model that is able to accurately capture...conference paper 2012
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Živković, M. (author), Bosman, J.W. (author), van den Berg, H. (author), van der Mei, R. (author), Meeuwissen, H.B. (author), Núñez-Queija, R. (author)We investigate dynamic decision mechanisms for composite web services maximizing the expected revenue for the providers of composite services. A composite web service is represented by a (sequential) workflow, and for each task within this workflow, a number of service alternatives may be available. These alternatives offer the same...conference paper 2012
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Klein Wolterink, W. (author), Heijenk, G. (author), van den Berg, J.L. (author)In this paper we present an analytical model accurately describing the behaviour of a multi-hop broadcast protocol. Our model covers the scenario in which a message is forwarded over a straight road and inter-node distances are distributed exponentially. Intermediate forwarders draw a small random delay before forwarding a message such as is...conference paper 2012
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te Hennepe, D.H. (author), van den Berg, J.L. (author), Karagiannis, G. (author)Long Term Evolution (LTE) is the latest cellular system that is being standardized by the 3rd Generation Partnership Project (3GPP) and is expected to substantially improve end-user throughput and reduce user plane latency, while at the same time significantly improve user experience with full mobility. To realize these expectations, 3GPP is...conference paper 2012
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Kooij, R.E. (author), Geijer, M. (author)This paper belongs to a research program started in 2006, dealing with Quality of Experience (QoE) aspects of channel zapping. The program, which has relevance for the broader topics Quality of Service and Next Generation Networks, started with quantifying the QoE expressed as a socalled Mean Opinion Score (MOS) for situations when a black...conference paper 2012
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Worm, D.T.H. (author), Živković, M. (author), van den Berg, J.L. (author), van der Mei, R. (author)Service composition is one of the major approaches in service oriented architecture (SOA) based systems. Due to the inherent stochastic nature of services execution environment the issue of composite service quality assurance within SOA is a very challenging one. Such heterogeneous environment requires dynamic, run-time composition of services....conference paper 2012
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Koc, Y. (author), Jamakovic, A. (author), Gijsen, B.M.M. (author)The domain name system (DNS) is a crucial component of the Internet. At this time, the DNS is facing major changes such as the introduction of DNSSEC and Internationalized Domain Name extensions (IDNs), the adoption of IPv6 and the upcoming extension of new generic top-level domains. These changes can significantly impact the behavior of the DNS...article 2012
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Mata, F. (author), Zuraniewski, P.W. (author), Mandjes, M. (author), Mellia, M. (author)In this paper we present methodological advances in anomaly detection, which, among other purposes, can be used to discover abnormal traffic patterns under the presence of deterministic trends in data, given that specific assumptions about the traffic type and nature are met. A performance study of the proposed methods, both if these assumptions...conference paper 2012
Searched for: subject%3A%22PNS%255C%2B%255C-%255C%2BPerformance%255C%2Bof%255C%2BNetworks%255C%2B%2526%255C%2BServices%22
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