Exploració per autor "Pioro, Michal"
Ara es mostren els items 1-10 de 10
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After failure repair optimization in dynamic flexgrid optical networks
Ruiz Ramírez, Marc; Zotkiewicz, Mateusz; Castro Casales, Alberto; Klinkowski, Miroslaw; Velasco Esteban, Luis Domingo; Pioro, Michal (The Optical Society (OSA), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialWe introduce the problem of reoptimizing the network after a link failure has been repaired as an effective way for reducing capacity usage and improving network performance. Numerical results show gains higher than 42%. -
Column generation algorithm for RSA problems in flexgrid optical networks
Ruiz Ramírez, Marc; Pioro, Michal; Zotkiewicz, Mateusz; Klinkowski, Miroslaw; Velasco Esteban, Luis Domingo (2013-10)
Article
Accés restringit per política de l'editorialFinding optimal routes and spectrum allocation in flexgrid optical networks, known as the RSA problem, is an important design problem in transport communication networks. The problem is TeX -hard, and its intractability ... -
Non-linear optimization for multi-path source routing in OBS networks
Klinkowski, Miroslaw; Pioro, Michal; Careglio, Davide; Marciniak, Marian; Solé Pareta, Josep (2007-12)
Article
Accés obertOptical Burst Switching (OBS) architectures without buffering capabilities are sensitive to burst losses. A proper routing strategy may help to reduce such congestion. In this letter we present a novel approach for OBS ... -
Optimization models for flexgrid elastic optical networks
Zotkiewicz, Mateusz; Pioro, Michal; Ruiz Ramírez, Marc; Klinkowski, Miroslaw; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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Accés restringit per política de l'editorialIn the paper we present integer programming (IP) optimization models for flexgrid elastic optical networks (EON). We consider several different basic assumptions regarding flexibility of EON that lead to a variety of IP ... -
Planning fixed to flexgrid gradual migration: drivers and open issues
Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Lord, Andrew; Fonseca, Daniel; Pioro, Michal; Wessäly, Roland; Fernández-Palacios, Juan Pedro (2014-01)
Article
Accés restringit per política de l'editorialFlexgrid technology has recently been presented as the most promising option for upgrading the currently operating fixed grid optical networks and extending their capacity to be able to deal with the massive traffic volumes ... -
Reoptimization of dynamic flexgrid optical networks after link failure repairs
Zotkiewicz, Mateusz; Ruiz Ramírez, Marc; Klinkowski, Miroslaw; Pioro, Michal; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2015-01-01)
Article
Accés obertIn dynamic flexgrid optical networks, the usage of capacity may not be optimal due to the permanent process of setting up and tearing down connections, which, if not controlled, leads to spectrum fragmentation and, as a ... -
Solving large instances of the RSA problem in flexgrid elastic optical networks
Walkowiak, Krzysztof; Zotkiewicz, Mateusz; Klinkowski, Miroslaw; Pioro, Michal; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2016-05-01)
Article
Accés obertWe present an optimization procedure that mixes advanced large-scale optimization methods and heuristics to solve large instances (with over 1.7 million integer variables) of the routing and spectrum allocation (RSA) ... -
Spectrum allocation problem in elastic optical networks - a branch-and-price approach
Pioro, Michal; Klinkowski, Miroslaw; Zotkiewicz, Mateusz; Walkowiak, Krzysztof; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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Accés restringit per política de l'editorialIn the paper we present a branch and price approach to routing and spectrum allocation – a basic optimization problem in elastic optical networks. We formulate the problem as a mixed-integer program for which ... -
Valid inequalities for the routing and spectrum allocation problem in elastic optical networks
Klinkowski, Miroslaw; Pioro, Michal; Zotkiewicz, Mateusz; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialWe deal with a natural integer-linear programming formulation of the routing and spectrum allocation (RSA) problem in elastic optical networks. We focus on strengthening the formulation with valid inequalities (cuts). For ... -
Virtual topology design in OBS networks
Klinkowski, Miroslaw; Pedroso, Pedro; Pioro, Michal; Careglio, Davide; Solé Pareta, Josep (2010)
Text en actes de congrés
Accés obertThe problem of burst losses in OBS networks has an impact on the service quality perceived by end users. In order to guarantee certain level of Service Quality (QoS) in terms of burst losses, wavelength resources have to ...