{"title":"Survivable Routing of Unicast and Anycast Flows in MPLS Networks","authors":"K. Walkowiak","doi":"10.1109/NGI.2007.371200","DOIUrl":"https://doi.org/10.1109/NGI.2007.371200","url":null,"abstract":"Most of previous research in anycasting has been focused on best-effort networks and IP networks. In contrast, we propose a QoS-based routing of anycast demands in connection-oriented MPLS network. Since in real networks different kinds of flows are transmitted over the same links, we assume that both unicast and anycast requests must be served in the network. Survivability of the network is one of the most important elements of QoS parameters since network failures can lead to significant consequences. We examine performance of several constraint-based algorithms for anycast server selection and QoS unicast routing algorithms. As the performance metric we use the flow lost due to a single failure of the link. For network restoration of anycast flows we propose a new scheme called backup server. Simulations show that application of backup server approach can significantly improve the network survivability.","PeriodicalId":207883,"journal":{"name":"2007 Next Generation Internet Networks","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121180199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Notice of Violation of IEEE Publication PrinciplesOn the Analysis of Queues with Long Range Dependent Traffic: An Extended Maximum Entropy Approach","authors":"D. Kouvatsos, S. A. Assi","doi":"10.1109/NGI.2007.371220","DOIUrl":"https://doi.org/10.1109/NGI.2007.371220","url":null,"abstract":"An extended maximum entropy (EME) framework is proposed for capturing long tail behaviour of queue lengths in broadband heterogeneous networks. The work is based on the maximisation of Tsaliis parametric entropy function for non-extensive systems subject to appropriate mean value constraints. Novel closed form expressions and asymptotic power laws are characterised for the state probabilities of single server queues with (or, without) finite capacity and self-similar/long-range dependent traffic. The EME approach employs, by analogy, as a mean queue length constraint, a heuristic generalisation of a formula suggested by Norros in the context of a simple storage model with infinite capacity and fractional Brownian motion (FBM) process as an input traffic process. Consequently, a relationship is postulated between the non-extensivity parameter, q, of Tsallis entropy and the Hurst self-similarity measure, H. Moreover, efficient numerical procedures are devised, based on the Newton-Raphson method, to compute the Lagrange's undetermined multipliers and, thus, the EME queue length distributions and associated performance metrics. Typical numerical tests are included to assess the credibility of the EME solutions and the adverse impact of self-similar traffic on queue performance.","PeriodicalId":207883,"journal":{"name":"2007 Next Generation Internet Networks","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122668557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Wac, P. Arlos, M. Fiedler, S. Chevul, L. Isaksson, R. Bults
{"title":"Accuracy Evaluation of Application-Level Performance Measurements","authors":"K. Wac, P. Arlos, M. Fiedler, S. Chevul, L. Isaksson, R. Bults","doi":"10.1109/NGI.2007.371190","DOIUrl":"https://doi.org/10.1109/NGI.2007.371190","url":null,"abstract":"In many cases, application-level measurements can be the only way for an application to evaluate and adapt to the performance offered by the underlying networks. Applications perceive heterogeneous networking environments spanning over multiple administrative domains as \"black boxes\" being inaccessible for lower-level measurement instrumentation. However, application-level measurements can be inaccurate and differ significantly from the lower-level ones, amongst others due to the influence of the protocol stacks. In this paper we quantify and discuss such differences using the Distributed Passive Measurement Infrastructure (DPMI), with Measurement Points (MPs) instrumented with DAG 3.5E cards for the reference link-level measurements. We shed light on various impacts on timestamp accuracy of application-level measurements. Moreover, we quantify the accuracy of generating traffic with constant inter-packet-times (IPTs). The latter is essential for an accurate emulation of application-level streaming traffic and thus for obtaining realistic end-to-end performance measurements.","PeriodicalId":207883,"journal":{"name":"2007 Next Generation Internet Networks","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126402844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Perceptual-based Quality Metrics for Image and Video Services: A Survey","authors":"U. Engelke, H. Zepernick","doi":"10.1109/NGI.2007.371215","DOIUrl":"https://doi.org/10.1109/NGI.2007.371215","url":null,"abstract":"The accurate prediction of quality from an end-user perspective has received increased attention with the growing demand for compression and communication of digital image and video services over wired and wireless networks. The existing quality assessment methods and metrics have a vast reach from computational and memory efficient numerical methods to highly complex models incorporating aspects of the human visual system. It is hence crucial to classify these methods in order to find the favorable approach for an intended application. In this paper a survey and classification of contemporary image and video quality metrics is therefore presented along with the favorable quality assessment methodologies. Emphasis is given to those metrics that can be related to the quality as perceived by the end-user. As such, these perceptual-based image and video quality metrics may build a bridge between the assessment of quality as experienced by the end-user and the quality of service parameters that are usually deployed to quantify service integrity.","PeriodicalId":207883,"journal":{"name":"2007 Next Generation Internet Networks","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129444243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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