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In this paper, we give an overview and classification of optical burst switching schemes and present burst reservation concepts. The performance of various basic reservation mechanisms proposed in literature is compared. Furthermore, a new analysis is introduced that allows to calculate the loss probabilities of a two-class system based on the reservation… (More)
At the beginning of the new millenium several trends can be observed in the field of communications networks. First, bandwidth requirement in networks seems to grow without limits. IP (Internet Protocol) based data networks play a central role. This is not only due to the fact that data traffic has surpassed voice traffic but even more due to the… (More)
Recently, the question has been heavily discussed whether burst assembly in edge nodes of Optical Burst Switching (OBS) networks reduces self-similarity of traffic [1-4]. Our performance evaluation by analysis and simulation shows that in most cases self-similarity remains unchanged. 1.Introduction In the design of next generation IP networks a major… (More)
Internet emerged as the global platform for communication • Exploding traffic demand • Highly dynamic and asymmetric traffic profiles ➔ flexible and efficient transport network • QoS demanding applications ➔ transport network should offer QoS WDM transport introduced as cost-efficient transport layer • Increasing discrepancy between optical transmission and… (More)
This paper presents and evaluates the new Weighted Integrated Routing scheme to solve the problem of dynamic routing and traffic grooming in meshed SDH/SONET-WDM multilayer networks. Its performance is compared to non-integrated schemes using a cost model.
In this paper different variations of the so-called " Tune-and-Select " (TAS) switching node for Optical Burst Switching (OBS) are investigated. Both signal degradation and burst losses limit the effective throughput of such optical burst switching nodes. These limitations are analysed for different nodes with four input/output fibres at different bit… (More)
The nite mass method, a new Lagrangian method for the numerical simulation of gas ows, is presented and analyzed. In contrast to the nite volume and the nite element method, the nite mass method is founded on a discretization of mass, not of space. Mass is subdivided into small mass packets of nite extension each of which is equipped with nitely many… (More)
The method of emulation is an attractive approach in order to evaluate the performance of communication networks. Compared to simulation, it is especially beneficial when real-world components, e.g., applications or protocols should be included. In this paper, we present the new emulation environment IKREmuLib, which allows for a seamless integration of… (More)
Kurzfassung Im Beitrag des BMBF Verbundvorhabens TransiNet werden mögliche, auf optische Vermittlung basierende Architekturen für den IP-Transport in zukünftigen Weitverkehrsnetzen identifiziert und Bewertungskriterien für diese Architekturen aufgestellt. Dabei gilt es den zukünftigen Anforderungen, wie wachsende Anzahl von Nutzern, stetig steigendes… (More)
The project TransiNet focuses on new approaches and system concepts for IP over optical and radio networks. The goals and activities of the five participating research institutes are described. In addition, their technical approaches and first results are presented.