Klaus Dolzer

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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)
On the way towards an architecture for a new QoS-supporting and scalable Internet, the IPover-photonics approach seems to be very promising. One possible solution in this domain is optical burst switching (OBS), a concept combining advantages of optical circuit and packet switching. After an introduction to OBS as well as the reservation mechanism(More)
Fourth generation mobile communication systems are characterized by heterogeneous access networks and IP-based transport technologies. Different access technologies give users great flexibility in choosing services, which can be different in QoS support, business models, and service providers. Realization of seamless handovers to the best network section(More)
In the design of next generation IP networks a major problem is the mismatch between extremely high optical transmission rates and relatively slower electronic processing. OBS applies separate realizations of the network data plane and control plane in the optical and electrical domain, respectively. Classification and proper assembly of small IP packets to(More)
In this paper, we give an overview and classification of optical burst switching schemes and burst reservation concepts. We compare the performance of different burst reservation mechanisms for an OBS node that does not distinguish different classes. The one that performed best and allows service differentiation, called Just-Enough-Time, is then evaluated(More)
Years of research on QoS architectures for IP networks have delivered sophisticated proposals, which have nevertheless not found broad commercial use. The reasons are not lack of technical soundness or insurmountable technological complexity, but insufficient attention to other, non-QoS-specific matters. First among them is the lack of a commercialization(More)
Whereas it is widely believed that the Network Layer of the OSI-ISO reference model is the convergence layer with respect to interoperability and service provisioning, an outstanding question remains which layer is the convergence layer with respect to Quality of Service, QoS. Despite an enormous amount of research work on IP-based QoS architectures like,(More)
In this paper several different strategies for traffic aggregation in enterprise networks formed by LANs that are interconnected via a WAN are compared. We discuss on the one hand the gain in time and space requirements in the WAN dependent on the number of aggregates and on the other hand the experienced waiting time as an important measure of QoS for(More)
The Internet, especially the World Wide Web (WWW), is currently considered as a particular promising application for the future Ka-Band systems and consequently most of the planned systems shall support Internet applications. However, it is far from clear how the application scenario will develop in future. But for certain there is an increasing requirement(More)