Now showing items 21-40 of 141

    • Burst contention avoidance schemes in hybrid GMPLS-enabled OBS/OCS optical networks 

      Perelló Muntan, Jordi; Spadaro, Salvatore; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE Computer Society Publications, 2009-02)
      Conference report
      Open Access
      Hybrid optical network architectures, combining benefits of optical circuit and burst switching technologies, become a natural evolution to improve overall network performance while reducing related costs. This paper ...
    • Capacity quantification of joint-switching-enabled flex- grid/SDM optical backbone networks 

      Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Spadaro, Salvatore (Optical Society of American (OSA), 2017)
      Conference report
      Open Access
      We quantify the network capacity scaling from 7 to 30 spatial channels. While multifiber provides a 5x capacity increase, MCF limits it to 4x and 2x in national and continental backbone networks, respectively.
    • Cognitive network slice management: The SliceNet approach 

      Spadaro, Salvatore; Nagin, Kenneth (2020-06-10)
      Article
      Open Access
      One of the enablers of 5G and beyond networks is the provisioning of network slices with proper Quality of Experience (QoE) guarantees to meet the requirements of vertical use cases. It poses several challenges to the ...
    • Cognitive science applied to reduce network operation margins 

      Notivol Calleja, Luis David; Spadaro, Salvatore; Perelló Muntan, Jordi; Junyent Giralt, Gabriel (2017-06-08)
      Article
      Open Access
      In an increasingly competitive market environment with smaller product offer differentiation, a continuous maximization of efficiency, while guarantying the quality of the provided services, remains a main objective for ...
    • Correlation between traffic granularity and defragmentation periodicity in elastic optical networks 

      Sayyad Kodashenas, Pouria; Comellas Colomé, Jaume; Perelló Muntan, Jordi; Spadaro, Salvatore (Wiley-Blackwell, 2015-07-01)
      Article
      Open Access
      While elastic optical network technologies have emerged as promising solutions for future ultra-high-speed optical transmission, the unavoidable spectral fragmentation problem that appears in such networks significantly ...
    • Cost-effective DWDM ROADM design for flexible sustainable optical metro–access networks 

      Sarmiento Hernández, Samael; Altabas, Jose Antonio; Izquierdo, David; Garces, Ignacio; Spadaro, Salvatore; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2017-12)
      Article
      Open Access
      Architectural changes are required for the underlying networks to support the expected Internet data traffic volume growth caused by the popularization of cloud services, 5G-based services, and social networks, to provide ...
    • Cost-effective ROADM architecture for C/DWDM metro-access networks convergence 

      Sarmiento Hernández, Samael; Spadaro, Salvatore; Lázaro Villa, José Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference lecture
      Restricted access - publisher's policy
      The Internet data traffic constant growth caused by the popularization of cloud services, mobile and social networks is requiring changes at the underlying networks in order to enable scalability whereas supporting a highly ...
    • Cost-effective ROADM design to maximize the traffic load capacity of u-DWDM coherent metro-access networks 

      Spadaro, Salvatore; Sarmiento Hernández, Samael; Lázaro Villa, José Antonio (2018-11-01)
      Article
      Open Access
      The current constant growing in traffic demands caused by the popularization of cloud services, mobile and social networks is requiring architectural changes at the underlying networks so as to provide a more highly dynamic ...
    • Cost-effective spatial super-channel allocation in Flex-Grid/MCF optical core networks 

      Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Spadaro, Salvatore (2018-01-01)
      Article
      Open Access
      Space Division Multiplexing (SDM) is a key technology to cope with the bandwidth limitations of single mode fibers. Multi-Core Fibers (MCFs) are considered as a promising candidate technology to implement SDM, due to their ...
    • Cost-efficient virtual optical network embedding for manageable inter-data-center connectivity 

      Perelló Muntan, Jordi; Spadaro, Salvatore; Pavón Mariño, Pablo (2013-02)
      Article
      Open Access
      Network virtualization opens the door to novel infrastructure services offering connectivity and node manageability. In this letter, we focus on the cost-efficient embedding of on-demand virtual optical network requests ...
    • Demonstration of GMPLS-controlled device power management for next generation green optical networks 

      Morea, Annalisa; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Spadaro, Salvatore (2012)
      Conference report
      Open Access
      We propose GMPLS protocol enhancements enabling dynamic power state management of optoelectronic network devices for setup-time-aware differentiated connection provisioning. Daily energy savings of 56% are demonstrated in ...
    • Demonstration of reconfigurable virtual data center networks enabled by OPS with QoS guarantees 

      Miao, Wang; Peng, Shuping; Spadaro, Salvatore; Bernini, Giacomo; Agraz Bujan, Fernando; Ferrer Ferré, Àlex; Perelló Muntan, Jordi; Zervas, Georgios; Nejabati, Reza; Ciulli, Nicola; Simeonidou, Dimitra; Dorren, Harm; Calabretta, Nicola (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      We demonstrate a reconfigurable virtual datacenter network by utilizing statistical multiplexing offered by scalable and flow-controlled optical switching system. Results show QoS guarantees by the priority assignment and ...
    • Demonstration of the benefits of SDN technology for all-optical data centre virtualisation 

      Jackson, Chris; Nejabati, Reza; Agraz Bujan, Fernando; Pagès Cruz, Albert; Galili, Michael; Spadaro, Salvatore; Simeonidou, Dimitra (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      An integrated software stack made up of extended OpenStack, OpenDaylight and custom OpenFlow agents enabling Virtual Data Centre deployment on an all-optical architecture employing hollow-core fibre, TDM fast switches and ...
    • Design and assessment of FM-MCFs-suited SDM-ROADMs with versatile spatial group configurations and unified QoT estimator 

      Rumipamba Zambrano, Rubén Darío; Muñoz González, Raül; Casellas Regi, Ramon; Perelló Muntan, Jordi; Spadaro, Salvatore; Elfiqi, Abdulaziz E. (Institute of Electrical and Electronics Engineers (IEEE), 2020-11-15)
      Article
      Open Access
      In this article, we focus on the design of different node architectures suitable for few-mode multi-core fibers (FMMCFs) based networks. Both dimensions, core and mode, open different possible ways to group spatial channels ...
    • Design and implementation of a GMPLS-controlled grooming-capable optical transport network 

      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, 2009-07)
      Article
      Open Access
      Aiming at better resource utilization, an important requirement of future optical transport networks is the capability to accommodate subwavelength client flows efficiently. This can be put into action thanks to the ...
    • Development and experimentation towards a multicast-enabled Internet 

      Careglio, Davide; Papadimitriou, Dimitri; Agraz Bujan, Fernando; Sahhaf, S; Perelló Muntan, Jordi; Tavernier, W; Spadaro, Salvatore; Colle, Didier (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      In this paper, we report our development experience and experimentation studies of two multicast routing schemes for the Internet, namely, PIM-SSM and GCMR. We detail their implementation over the Quagga open ...
    • Dynamic impairment-aware optical networking: some experimental results of the EU DICONET project 

      Spadaro, Salvatore; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Angelou, Marianna; Azodolmolky, Siamak; Qin, Yixuan; Nejabati, Reza; Simeonidou, Dimitra; Tomkos, Ioannis (2011)
      Conference report
      Restricted access - publisher's policy
      The paper presents some results from the experimental validation of the achievements of the EU DICONET project. Specifically, the DICONET test-bed is presented and the experiments conducted for the performance evaluation ...
    • Dynamic service reallocation in NFV-based transport WDM optical networks 

      Pagès Cruz, Albert; Agraz Bujan, Fernando; Montero, Rafael; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      Future network services are expected to deliver additional functionalities besides connectivity. The Network Function Virtualization (NFV) paradigm provides the foundation for such concept. We propose a reallocation-based ...
    • Dynamic topology discovery in SDN-enabled transparent optical networks 

      Montero, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Perelló Muntan, Jordi; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      Optical technologies play nowadays a crucial role in different network scenarios (e.g., data centres, metro and access networks), mainly due to their support for higher bandwidth and scalability in comparison to electronic-based ...
    • Dynamic traffic grooming in Joint Switching (JoS)-enabled flex-grid/SDM optical core networks 

      Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      We propose and evaluate a dynamic traffic grooming strategy enhancing the performance of JoS-enabled Flex-Grid/SDM networks. Results disclose up to 120% and 44% additional carried network traffic vs. no grooming and existing ...