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Telsiks
Practical models for design and reconfiguration of virtual topology in optical transport networks2003 •
In this paper we deal with reconfiguration of virtual topology. Routing of traffic through virtual and physical topology is investigated. Practical model for minimizing the difference between initial and reconfigured virtual topology is presented. The results show the utilization of the links and augmentation of the number of the lightpaths for two types of networks with different line system and different optical channel capacities.
Optical Switching and …
Design of Virtual Topologies for Large Optical Networks Through An Efficient MILP Formulation2006 •
2012 •
Optical network infrastructures can be partitioned into multiple parallel, dedicated virtual networks for a physical infrastructure sharing purpose. However, different transport technologies may impact in both the amount and the characteristics of the different virtual instances that can be built on top of a single physical infrastructure. To analyse the impact of the transport technology in this regard, we present exact Integer Linear Programming (ILP) formulations that address the off-line problem of optimally allocate a set of virtual networks in two kind of substrates: wavelength switching and spectrum switching. Both formulations serve the purpose to provide opaque transport services from the virtual network point of view, where electronic terminations are assumed in the virtual network nodes. We carry out a series of experiments to validate the presented formulations and determine which is the impact of both substrates in the number of virtual networks that can be optimally allocated in the transport network.
IEE Proceedings - Circuits, Devices and Systems
Multiperiod virtual topology design in wavelength routed optical networks2003 •
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering
Virtual network mapping - An optimization problem2012 •
Until recently the main limitation to the development of networks was the cost of equipment and transmission. Today the main problem is the increasing energy consumption. A number of studies estimate the energy consumption of ICT in a range of 2%-10% of global power usage with telecommunication networks occupying a large part of this proportion. For this reason, in recent years considerable efforts are made in order to create energy efficient networks architectures. In this context, this paper focuses on reducing the energy consumption of an IP Over WDM backbone network using lightpath bypass and traffic grooming capabilities. Although previously proposed schemes based on lightpath bypass and grooming strategies can reduce the overall energy consumption on a network they do not take into account the minimization of the number of the lightpaths that should be established in the virtual topology. To overcome the above mentioned drawback a novel power-aware heuristic, called Online Virtual Topology Configuration (OVTC), which will focus on energy efficiency issues related to the operation phase of a WDM optical network is proposed. This model which is mainly based on lightpath bypass and grooming capabilities, reduces the number of lightpaths that should be established in the virtual topology, disabling and reusing lightpaths which data could be routed via alternative pre-established lightpaths and thus reduces the overall power consumption. Simulation results indicate that the proposed architecture manages to achieve a percentage of power saving by up to 6%, compared to similar proposed techniques for energy-saving.
2012 16th International Conference on Optical Network Design and Modelling (ONDM)
Performance modelling and analysis of dynamic virtual optical network composition2012 •
Breve Historia Militar de España
F. Quesada Sanz (2023) "Hispania Prerromana"2023 •
NIPO NIPO 083-23-246-3
Marian Devotion in the Late Middle Ages Image and Performance
Diagrammatic Devotion and the Defensorium Mariae in the Funerary Chapel of Hărman Parish Church2022 •
Doboku Gakkai Ronbunshu
Representing Travel Choice Behavior Dynamics Based on Cross-Sectional and Longitudinal Heterogeneity2004 •
2006 •
2020 •
Journal of the Pediatric Infectious Diseases Society
Corrigendum: BCG Vaccination at Birth and Rate of Hospitalization for Infection Until 15 Months of Age in Danish Children: A Randomized Clinical Multicenter Trial2020 •