Thomas Bauschert

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This paper considers the functionality and standards required to enable carrier-grade core networks based on Ethernet-over-WDM. Possible Ethernet backbone network architectures will be discussed followed by an evaluation of the CAPEX and OPEX performance. © 2006 Optical Society of America OCIS Codes: (060.4250) Networks; (999.9999) Ethernet over WDM,(More)
Arie M. C. A. Koster∗, Christoph Helmberg†, Andreas Bley‡, Martin Grötschel§, Thomas Bauschert¶ ∗Lehrstuhl II für Mathematik, RWTH Aachen University, D-52062 Aachen, Germany, †Department of Mathematics, Chemnitz University of Technology, D-09107 Chemnitz, Germany, ‡Institut für Mathematik,(More)
This paper addresses the problem of dimensioning IP access networks for elastic traffic, which is carried by the TCP protocol. The M/G/R Processor Sharing model (M/G/R PS) is used as the basis for capacity computations. The model is extended to take into account TCP specific properties, thus, giving more accurate values, especially for increasing round-trip(More)
Energy efficiency and the minimization of capital expenditures (CAPEX) for network equipment are studied for two network architectures: IP over WDM and IP over OTN over WDM. Case study results from mixed integer linear programming (MILP) formulations indicate that a CAPEX optimized network yields solutions having minimum energy consumption for both(More)
Hybrid networking capabilities, enabled by the emergence of control plane architectures such as generalized multiprotocol label switching (GMPLS), establish the breeding ground for the development of innovative network architectures. Traditionally, the need for minimal service disruptions during failure events led to the costintensive duplication of network(More)
The planning of a communication network is inevitably depending on the quality of both the planning tool and the demand forecast used. In this article, we show exemplarily how the emerging area of Robust Optimization can advance the network planning by a more accurate mathematical description of the demand uncertainty. After a general introduction of the(More)
The cost eecient design of ATM networks is considered to be a challenging problem due to the heterogenity of services, the statistical muliplexing gain resulting from the resource sharing of variable bitrate (VBR) connections and the possibility of resource separation through virtual paths (VPs). Most proposals in literature are well suited for small(More)
This paper addresses an important aspect of mobile core network virtualization: The combined optimization of the virtual mobile core network topology (graph) and its embedding onto a physical substrate network. Basically this comprises the placement of mobile core virtual network functions (VNFs) onto the nodes of the physical substrate network, the(More)