Ara es mostren els items 1-20 de 181

    • A column generation approach for large-scale RSA-based network planning 

      Ruiz Ramírez, Marc; Zotkiewicz, Mateusz; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      In flexgrid-based optical networks, the problem of finding optimal route and spectrum allocation (RSA) for the demands in a traffic matrix becomes harder to solve than similar problems in fixed DWDM networks, mainly due ...
    • A distributed telemetry architecture for optical networks 

      González Pacheco, Pol; Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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      A distributed telemetry system is proposed with agents receiving and analyzing data before sending to a centralized manager. Intelligent data aggregation on optical constellations telemetry largely reduces data rate without ...
    • A GRASP with path-relinking heuristic for the survivable IP/MPLS-over-WSON multi-layer network optimization problem 

      Pedrola Escribà, Òscar; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Careglio, Davide; González de Dios, Óscar; Comellas Colomé, Jaume (2013-12)
      Article
      Accés restringit per política de l'editorial
      In this paper we deal with the survivable internet protocol (IP)/multi-protocol label switching (MPLS)-over-wavelength switched optical network (WSON) multi-layer network optimization problem (SIMNO). This problem entails ...
    • A GRASP-based heuristic to design the GMPLS control plane network topology with resilience guarantees 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2008)
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      The control plane topology has traditionally followed that of the data plane and therefore the design of the former, as well as its resilience, has been addressed in the latter's one. Owing to the fact that a clear separation ...
    • A traffic intensity model for flexgrid optical network planning under dynamic traffic operation 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      We obtain a model to estimate the highest traffic intensity that a flexgrid-based network can support in dynamic scenarios. A design problem is introduced to illustrate its application. Numerical results validate both ...
    • Accurate low complex modulation format and symbol rate identification for autonomous lightpath operation 

      Sequeira, Diogo Gonçalo; Ruiz Ramírez, Marc; Costa, Nelson; Napoli, Antonio; Pedro, João; Velasco Esteban, Luis Domingo (2022-11-28)
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      Network automation promises to reduce costs while guaranteeing the required performance; this is paramount when dealing with the forecasted highly dynamic traffic that will be generated by new 5G/6G applications. In optical ...
    • Adaptation of the residual signal for filter failure detection in scenarios with multiple filter types 

      Barzegar, Sima; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (2019)
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      To monitor the optical spectra of outgoing links, Optical Spectrum Analyzers (OSA) can deployed in the optical nodes acquiring the optical spectra of outgoing links and analyzing optical signals to detect ...
    • Adapting the virtual network topology to near future traffic 

      Morales Alcaide, Fernando; Festa, Paola; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      The introduction of new services requiring large and dynamic bitrate connectivity can cause changes in the direction of the traffic in metro and even core network segments along the day. This leads to large overprovisioning ...
    • 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)
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      We 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%.
    • An architecture to support autonomic slice networking 

      Velasco Esteban, Luis Domingo; Gifre Renom, Lluís; Izquierdo Zaragoza, José Luis; Paolucci, Francesco; Vela, Alba P.; Sgambelluri, Andrea; Ruiz Ramírez, Marc; Cugini, Filippo (2017-09-01)
      Article
      Accés obert
      IEEE Network slices combine resource virtualization with the isolation level required by future 5G applications. In addition, the use of monitoring and data analytics help to maintain the required network performance, while ...
    • An autoencoder-based solution for IQ constellation analysis 

      Ruiz Ramírez, Marc; Morales López, Javier; Sequeira, Diogo Gonçalo; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      A method for IQ constellation analysis based on Autoencoders is proposed. Exhaustive numerical results show accurate physical metric prediction and large data compression, while providing useful model explainability.
    • An experimental GMPLS-controlled network test-bed enabling sub-wavelength connection provisioning 

      Agraz Bujan, Fernando; Velasco Esteban, Luis Domingo; Perelló Muntan, Jordi; Ruiz Ramírez, Marc; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06-28)
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      The efficient accommodation of sub-wavelength client flows on optical channels is a current challenge for resources use optimization in GMPLS controlled optical networks. While optical channels capacity usually exceeds 10 ...
    • An in-operation planning tool architecture for flexgrid network re-optimization 

      Gifre Renom, Lluís; Castro Casales, Alberto; Ruiz Ramírez, Marc; Navarro, Nacho; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      In-operation network planning consists in re-optimizing a network, currently being operated to transport traffic, either minimizing resource utilization or maximizing the transported traffic. In the context of flexgrid ...
    • An intelligent optical telemetry architecture 

      Velasco Esteban, Luis Domingo; González Pacheco, Pol; Ruiz Ramírez, Marc (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      A distributed telemetry system is proposed with agents receiving and analyzing data before sending to a centralized manager. Intelligent data aggregation on optical constellations telemetry largely reduces data rate without ...
    • Applications of digital twin for autonomous zero-touch optical networking [Invited] 

      Velasco Esteban, Luis Domingo; Devigili, Mariano; Ruiz Ramírez, Marc (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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      Huge efforts have been paid lastly to study the application of Machine Learning techniques to optical transport networks. Applications include Quality of Transmission (QoT) estimation, failure and anomaly detection, and ...
    • Applying data visualization for failure localization 

      Vela, Alba P.; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Data visualization is applied to BER measures in a bigdata repository. Bubble charts are produced to identify lightpaths with increasing BER and spectrum color maps are then used to identify the most likely degraded link
    • Autonomic content delivery network service 

      Velasco Esteban, Luis Domingo; Gifré Renom, Lluís; Ruiz Ramírez, Marc (2019)
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      We focus on a use case where a virtualized Content Delivery Network (CDN) service autonomously adapts to the load by requesting the instantiation of new VMs in selected leaf cache nodes, as well as by ...
    • Autonomic disaggregated multilayer networking 

      Gifre Renom, Lluís; Izquierdo Zaragoza, José Luis; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2018-05-01)
      Article
      Accés obert
      Focused on reducing capital expenditures by opening the data plane to multiple vendors without impacting performance, node disaggregation is attracting the interest of network operators. Although the software-defined ...
    • Autonomic NFV network services on top of disaggregated optical metro networks 

      Esmenats, P. R.; Casellas Regi, Ramon; Gifre Renom, Lluís; Pérez Vela, Alba; Ruiz Ramírez, Marc; Martínez, Ricardo; Velasco Esteban, Luis Domingo (2019)
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      Control and orchestration of metro network to support dynamic provisioning and reconfiguration of services based on Virtual Network Functions are demonstrated through a CDN example. Interaction among CASTOR MDA, OSM and ...
    • Autonomic transmission through pre-FEC BER degradation prediction based on SOP monitoring 

      Shariati, Mohammad Behnam; Boitier, F.; Ruiz Ramírez, Marc; Layec, Patricia; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      An Autonomic Transmission Agent based on machine-learning is proposed for excessive bit-error-rate prediction resulting from real-time analysis of state-of-polarization (SOP). The accuracy and speed of the agent enables ...