Learn 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)
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)
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)
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)
Contrary to some announcements, bandwidth will remain a scarce resource in certain sectors such as Internet access via mobile networks. Thus, models for exact dimensioning and optimization of Internet access networks become vital for economy and quality of service. The Internet will soon integrate real-time (stream) and non-real-time (elastic) traffic(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)