Ara es mostren els items 117-136 de 181

    • OCATA: A deep-learning-based digital twin for the optical time domain 

      Sequeira, Diogo Gonçalo; Ruiz Ramírez, Marc; Costa, Nelson; Napoli, Antonio; Pedro, João; Velasco Esteban, Luis Domingo (Optical Society of American (OSA), 2023-02-01)
      Article
      Accés obert
      The development of digital twins to represent the optical transport network might enable multiple applications for network operation, including automation and fault management. In this work, we propose a deep-learning-based ...
    • On real-time optical subcarrier management in P2MP networks with mixed-strategy gaming 

      Wang, Qian; Shakespear Miles, Hailey Josephine; Chen, Xiaoliang; Ruiz Ramírez, Marc; Li, Zhaohui; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      We developed a mixed-strategy gaming approach for distributed and real-time optical subscarrier management in point-to-multipoint networks, achieving traffic loss rates close to those by ILP-based centralized optimization.
    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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-demand incremental capacity planning in optical transport networks 

      Velasco Esteban, Luis Domingo; Morales Alcaide, Fernando; Gifre Renom, Lluís; Castro Casales, Alberto; González de Dios, Oscar; Ruiz Ramírez, Marc (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Article
      Accés restringit per política de l'editorial
      Incremental planning is performed periodically to decide how a backbone optical network has to be updated to serve the forecast traffic during the next planning period. Based on reliable traffic prediction, new equipment ...
    • Optical network automation [Invited tutorial] 

      Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Comunicació de congrés
      Accés obert
      Increased levels of automation will be necessary in view of more stringent performance requirements that next generation optical transport networks need to support in a near term, not only for high capacity, but, even more ...
    • Optical network net present value optimization in shared path protection environments 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Network operators are facing hard competition for opportunities in the telecommunications market, thus network investments must be carefully evaluated from the costs and revenues viewpoint before the decision making ...
    • Optical network traffic analysis under B5G/6G RAN operation 

      Wang, Shaoxuan; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      The advent of 6G will revolutionize the way Radio Access Networks (RAN) will be operated. Expected massive small cell deployments and features, such as an adaptive functional splitting, are expected to change not only the ...
    • Optical signal tracking for robust PAM4 deployment in filterless metro network scenarios 

      Shariati, Mohammad Behnam; Fresi, Francesco; Ruiz Ramírez, Marc; Cugini, Filippo; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Text en actes de congrés
      Accés obert
      Highly accurate and reliable optical signal tracking is proposed that estimates sub-GHz laser drift failures by analyzing spectra acquired by cost-effective coarse-granular OSAs. Its application on PAM4 systems in filterless ...
    • Optimización de recursos en redes de transporte ópticas multicapa 

      Ruiz Ramírez, Marc (Universitat Politècnica de Catalunya, 2009-02)
      Projecte Final de Màster Oficial
      Accés obert
      Este proyecto aborda la optimización de recursos en redes de transporte ópticas multicapa. Se plantea un problema de liberación de interfaces ópticas en sistemas de tráfico dinámicos y se resuelven diferentes ejemplos ...
    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...
    • Optimizing link spectrum occupancy in elastic optical networks 

      Comellas Colomé, Jaume; Ruiz Ramírez, Marc; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work focuses on spectrum assignment in Elastic Optical Networks. The accurate study about spectrum occupancy in a flexgrid link is carried out. As a result, the probability values of finding different connection sizes ...
    • Orchestrating connectivity services to support elastic operations in datacenter federations 

      Asensio Garcia, Adrian; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (2015-06)
      Article
      Accés obert
      Datacenter federations are able to manage appropriately the green energy resources available in each datacenter (DC) thanks to their geographically distributed infrastructure, thus reducing energy expenditure. Scheduling ...
    • Orchestrating virtual machine migrations in telecom clouds 

      Barrera Sanson, Joaquim; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A throughput model is experimentally assessed and then used to compare nonorchestrated against orchestration when multiple VMs are migrated among datacenters in a telecom cloud. Numerical results show migration time ...
    • Out-of-field generic ML training with in-field specific adaptation to facilitate ML deployments 

      Shariati, Mohammad Behnam; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Text en actes de congrés
      Accés obert
      A two-phase strategy to facilitate ML algorithm deployment in real networks is demonstrated: out-of-field training uses data from simulation and testbed experiments with generic equipment whereas in-field adaptation is ...
    • Packet flow capacity autonomous operation based on reinforcement learning 

      Barzegar, Sima; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Multidisciplinary Digital Publishing Institute (MDPI), 2021-12-12)
      Article
      Accés obert
      As the dynamicity of the traffic increases, the need for self-network operation becomes more evident. One of the solutions that might bring cost savings to network operators is the dynamic capacity management of large ...
    • Path-based recovery in flexgrid optical networks 

      Castro Casales, Alberto; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      With the advent of flexgrid optical networks, the rigid wavelength-division multiplexing (WDM) technology will be enhanced by providing better spectrum efficiency and flexibility. In those future flexible optical networks, ...
    • Performance evaluation of light-tree schemes in flexgrid optical networks 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (2014-10-01)
      Article
      Accés restringit per política de l'editorial
      New applications require conveying huge bitrate from a source node to multiple destinations. As a result, point-to-multipoint (P2MP) connections need to be established on the optical layer. In this paper, the P2MP routing ...
    • Performance evaluation of the VNT reconfiguration algorithm based on traffic prediction 

      Morales Alcaide, Fernando; Festa, Paola; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In a previous work, the Virtual Network Topology Reconfiguration problem based on Traffic Prediction (VENTURE) was proposed as a means of efficiently adapting core virtual network topology (VNT) to the near-future traffic. ...
    • PILOT: A methodology for modeling the performance of packet connections 

      Comellas Colomé, Jaume; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      Network Services automation requires predictable Quality of Service (QoS) performance, measured in terms of throughput, delay and jitter, to allow making proactive decisions. QoS is typically guaranteed by overprovisioning ...
    • 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'editorial
      Flexgrid 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 ...