Now showing items 21-40 of 45

    • Modeling the routing and spectrum allocation problem for flexgrid optical networks 

      Velasco Esteban, Luis Domingo; Klinkowski, Miroslaw; Ruiz Ramírez, Marc; Comellas Colomé, Jaume (2012-12)
      Article
      Restricted access - publisher's policy
      Flexgrid optical networks are attracting huge interest due to their higher spectrum efficiency and flexibility in comparison with traditional wavelength switched optical networks based on the wavelength division multiplexing ...
    • Modelling and performance evaluation of a translucent OBS network architecture 

      Pedrola Escribà, Òscar; Careglio, Davide; Klinkowski, Miroslaw; Solé Pareta, Josep (IEEE Computer Society Publications, 2010)
      Conference report
      Open Access
      Most research works in optical burst switching (OBS) networks do not take into account the impact of physical layer impairments (PLIs) either by considering fully transparent (i.e., using optical 3R regeneration) or opaque ...
    • 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
      Open Access
      Optical 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 ...
    • Offline impairment-aware RWA and regenerator placement in translucent optical networks 

      García Manrubia, Bélen; Pavón Mariño, Pablo; Aparicio Pardo, Ramón; Klinkowski, Miroslaw; Careglio, Davide (2010-09-29)
      External research report
      Open Access
      In translucent optical networks the physical layer impairments degrading the optical signal are considered in the network design. In this paper we investigate the offline problem of Routing and Wavelength Assignment (RWA) ...
    • Offline routing and regenerator placement and dimensioning for translucent OBS networks 

      Pedrola Escribà, Òscar; Careglio, Davide; Klinkowski, Miroslaw; Solé Pareta, Josep (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
      Article
      Restricted access - publisher's policy
      The deployment of translucent optical networks is considered the most promising short term solution to decrease costs and energy consumption in optical backbone networks. In fact, translucent wavelength switched optical ...
    • Offset time-emulated architecture for optical burst switching-modelling and performance evaluation 

      Klinkowski, Miroslaw (Universitat Politècnica de Catalunya, 2008-02-14)
      Doctoral thesis
      Open Access
      L'evolució de les xarxes publiques de transport de dades destaca per el continu augment de la demanda de tràfic a la que estan sotmeses. La causa és la imparable popularització d'Internet i del seu ús per a tot tipus ...
    • On the offline physical layer impairment aware RWA algorithms in transparent optical networks: state-of-the-art and beyond 

      Azodolmolky, Siamak; Pointurier, Yvan; Klinkowski, Miroslaw; Marín Tordera, Eva; Careglio, Davide; Solé Pareta, Josep; Angelou, Marianna; Tomkos, Ioannis (IEEE Press and Wiley, 2009-02-18)
      Conference report
      Open Access
      In transparent optical networks with no regeneration, the problem of capacity allocation to traffic demands is called "Roting and Wavelength Assignment". Much work on this topic recently has focused on the dynamic case, ...
    • On the performance of flexgrid-based optical networks 

      Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Pedrola Escribà, Òscar; Castro Casales, Alberto; Klinkowski, Miroslaw; Careglio, Davide; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Conference report
      Restricted access - publisher's policy
      The ever increasing IP traffic volume has finally brought to light the high inefficiency of current wavelength-routed rigid-grid networks in matching the client layer requirements. Such an issue results in the deployment ...
    • On the physical impairments constraint in OBS networks 

      Pedrola Escribà, Òscar; Careglio, Davide; Klinkowski, Miroslaw; Solé Pareta, Josep (2010)
      Conference report
      Open Access
      The introduction of sub-wavelength switching is one of the main objectives of the future transparent optical mesh networks. One strong candidate is Optical Burst Switching (OBS) which improves the resource utilisation by ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      In 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 ...
    • Performance issues in Optical Burst/Packet Switching 

      Klinkowski, Miroslaw; Careglio, Davide; Aracil Rico, Javier; Azodolmolky, Siamak; García Haro, Juan; Gunreben, Sebastian; Hu, Guoqiang; Izal, Mikel; Kimsas, Andreas; Veiga Gontán, Javier; Tzanakaki, Anna; Tomkos, Ioannis; Spadaro, Salvatore; Scharf, Joachim; Perelló Muntan, Jordi; Pavón Mariño, Pablo; Morató, Daniel; Magaña, Eduardo; Köhn, Martin (Springer, 2009-04-01)
      Part of book or chapter of book
      Restricted access - publisher's policy
      This chapter summarises the activities on optical packet switching (OPS) and optical burst switching (OBS) carried out by the COST 291 partners in the last 4 years. It consists of an introduction, five sections with ...
    • Performance overview of the offset time emulated OBS network architecture 

      Klinkowski, Miroslaw; Careglio, Davide; Solé Pareta, Josep; Marciniak, Marian (2009-07)
      Article
      Open Access
      Optical burst switching (OBS) control architecture considers two different models for the management of the offset time in the network. The conventional OBS (C-OBS) introduces the offset time in soft-way by delaying the ...
    • Preemption window for burst differentiation in OBS 

      Klinkowski, Miroslaw; Careglio, Davide; Morató, Daniel; Solé Pareta, Josep (BERTScope, 2008-02-28)
      Conference report
      Open Access
      This paper presents a novel control architecture for optical burst switching networks to efficiently apply burst preemption without the resources overbooking, which is specific to conventional OBS. Simulation results prove ...
    • Preemption window mechanism for efficient QoS support in E-OBS network architecture 

      Careglio, Davide; Klinkowski, Miroslaw; Solé Pareta, Josep (ICST, 2008-09-30)
      Conference report
      Open Access
      This paper focuses on the problem of quality of service (QoS) provisioning in optical burst switching (OBS) networks. OBS is a promising photonic network technology aiming at efficient transport of IP traffic by means of ...
    • Reactive and proactive routing in labelled optical burst switching networks 

      Klinkowski, Miroslaw; Careglio, Davide; Solé Pareta, Josep (2009-04)
      Article
      Open Access
      Optical burst switching architectures without buffering capabilities are sensitive to burst congestion. The existence of a few highly congested links may seriously aggravate the network throughput. Proper network routing ...
    • 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
      Open Access
      In 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 ...
    • Research in optical burst switching within the e-Photon/ONe network of excellence 

      González de Dios, Óscar; Aracil Rico, Javier; Akar, Nail; Bjornstad, Steinar; Casoni, Maurizio; Christodoulopoulos, K.; Careglio, Davide; Fernández Palacios, Juan Pedro; Gauger, C.; Tosi Beleffi, Giorgio M.; Stol, Norvald; Simeonidou, Dimitra; Raffaelli, Carla; Overby, Harald; Nejabati, Reza; Morató, Daniel; Klinkowski, Miroslaw; Karasan, Ezhan; Hu, Guoqiang; Vlachos, K. (2007-02)
      Article
      Restricted access - publisher's policy
      This paper presents a summary of Optical Burst Switching (OBS) research within the VI framework program e-Photon/ONe network of excellence. The paper includes network aspects such as routing techniques, resilience and ...
    • Research on optical core networks in the e-photon/ONe Network of excellence 

      Klinkowski, Miroslaw; Callegati, Franco; Aracil, Rafael; Wosinska, Lena; Andriolli, Nicola; Careglio, Davide; Giorgetti, Alessio; Fernández Palacios, Juan Pedro; Gauger, C.; Tornatore, Massimo; Sengezer, N.; Rea, L.; Raffaelli, Carla; Overby, Harald; Matera, F.; Karasan, Ezhan; Hu, G.; González de Dios, Óscar (IEEE Computer Society Publications, 2006-04-23)
      Conference report
      Open Access
      This papers reports the advances in Optical Core networks research coordinated in the framework of the e-Photon/ONe and e-Photon/ONe+ networks of excellence.
    • RRPD strategies for a T-OBS network architecture 

      Pedrola Escribà, Òscar; Careglio, Davide; Klinkowski, Miroslaw; Solé Pareta, Josep (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      In this paper, we deal with the physical layer impairments (PLIs) in optical burst switching (OBS). In particular we present a formulation of the routing and regenerator placement and dimensioning (RRPD) problem for 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
      Open Access
      We 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) ...