Now showing items 21-40 of 55

    • End-to-end 5G service deployment and orchestration in optical networks with QoE guarantees 

      Montero Herrera, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      The upcoming 5G deployments will impose stringent requirements. Optical networks control and resource orchestration is set to potentially turn into software-defined approaches in order to address such requirements. As a ...
    • Enhanced domain disjoint backward recursive TE path computation for PCE-based multi-domain networks 

      Hernández Sola, Guillem; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Junyent Giralt, Gabriel (2011-04)
      Article
      Restricted access - publisher's policy
      The ability of computing optimal routes poses new challenges when extending it to larger multi-domain network scenarios, as the quality of these computed endto-end inter-domain routes depends on the selection of the domain ...
    • Experimental assessment of an SDN-based control of OPS switching nodes for intra-data center interconnect 

      Agraz Bujan, Fernando; Miao, Wang; Ferrer Delgado, Alejandro; Bernini, Giacomo; Dorren, Harm; Calabretta, Nicola; Ciulli, Nicola; Perelló Muntan, Jordi; Peng, Shuping; Zervas, Georgios; Simeonidou, Dimitra; Junyent Giralt, Gabriel; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      An SDN-based control framework for OPS switches is experimentally assessed. The OpenFlow messages enabling control communication between SDN controller and OPS switch are validated. Dynamic OPS virtual network slices for ...
    • Experimental assessment of SDN-enabled reconfigurable OPSquare data center networks with QoS guarantees 

      Xue, Xuwei; Wang, Fulong; Agraz Bujan, Fernando; Pagès Cruz, Albert; Pan, B; Yan, F; Spadaro, Salvatore; Calabretta, Nicola (Optical Society of American (OSA), 2019)
      Conference report
      Restricted access - publisher's policy
      An SDN-controlled DCN enabling QoS-driven network-slice reconfiguration and packet priority updating is experimentally assessed. Network-slice can be reconfigured within 150 ms to decrease packet loss. The measured ToR-to-ToR ...
    • Experimental assessment of SDN-enabled sliceable OPSquare data center network with deterministic QoS 

      Xue, Xuwei; Wang, Fu; Agraz Bujan, Fernando; Pagès Cruz, Albert; Yan, Fulong; Spadaro, Salvatore; Calabretta, Nicola (2019)
      Conference report
      Restricted access - publisher's policy
      An SDN-enabled sliceable DCN with deterministic QoS guarantees is experimentally assessed. Flow priorities are dynamically assigned to each network-slice to prevent statistical latency and packet-loss due to packet ...
    • Experimental assessment of VDC provisioning in SDN/OpenStack-based DC infrastructures with optical DCN 

      Pagès Cruz, Albert; Agraz Bujan, Fernando; Montero Herrera, Rafael; landi, Giada; Monno, Roberto; Aznar, Jose; Viñes, Albert; Jackson, Chris; Simeonidou, Dimitra; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Restricted access - publisher's policy
      VDC provisioning requires the coordinated configuration of several types of resources. We present a DC architecture for the orchestration and provisioning of VDC instances on top of DCs with optical DCN and experimentally ...
    • Experimental comparison of impairment-aware RWA algorithms in a GMPLS-controlled dynamic optical network 

      Angelou, Marianna; Agraz Bujan, Fernando; Kokkinos, Panagiotis; Perelló Muntan, Jordi; Azodolmolky, Siamak; Varvarigos, Emmanouel; Spadaro, Salvatore; Tomkos, Ioannis (2011)
      Conference report
      Open Access
      The European research project DICONET proposed and implemented a multi-plane impairment-aware solution for flexible, robust and cost-effective core optical networks. The vision of DICONET was realized via a set of cross-layer ...
    • Experimental demonstration of centralized and distributed impairment-aware control plane schemes for dynamic transparent optical networks 

      Tomkos, Ioannis; Gunkel, Mathias; Varvarigos, Manos; Kokkinos, Panagiotis; Pointurier, Yvan; Agraz Bujan, Fernando; Azodolmolky, Siamak; Angelou, Marianna; Perelló Muntan, Jordi; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Francescon, Antonio; Saradhi, Chava (IEEE Computer Society Publications, 2010)
      Conference report
      Open Access
      In transparent optical networks, the signal experiences the impact of various phenomena that degrade its quality. Considering the impact of physical layer impairments (PLIs) on transparent [1] and highly dynamic optical ...
    • Experimental demonstration of SDN-enabled reconfigurable disaggregated data center infrastructure 

      Guo, Xiaotao; Agraz Bujan, Fernando; Xue, Xuwei; Pan, Bitao; Pagès Cruz, Albert; Zhang, Shaojuan; Exarchakos, Georgios; Spadaro, Salvatore; Calabretta, Nicola (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference report
      Restricted access - publisher's policy
      A 4-node prototype of SDN-controlled disaggregated data-center network is experimentally demonstrated based on the nanoseconds optical switch, enabling flexible hardware resource provisioning and dynamic resource reallocation. ...
    • Experimental evaluation of path restoration for a centralised impairment-aware GMPLS-controlled all-optical network 

      Tomkos, Ioannis; Agraz Bujan, Fernando; Perelló Muntan, Jordi; Angelou, Marianna; Azodolmolky, Siamak; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Kokkinos, Panagiotis; Varvarigos, Emmanouel (IEEE Computer Society Publications, 2010)
      Conference report
      Open Access
      This paper evaluates a centralised impairment-aware path restoration approach for GMPLScontrolled transparent optical networks. Experimental results on a 14-node network test-bed show successful QoT compliant path restoration ...
    • Experimental validation of end-to-end GMPLS-enabled restoration in multi-domain transparent WSON 

      Martínez, Ricardo; Casellas, Ramon; Velasco Esteban, Luis Domingo; Agraz Bujan, Fernando; Muñoz, Raul; Spadaro, Salvatore (IEEE Computer Society Publications, 2010)
      Conference report
      Open Access
      Two GMPLS restoration strategies operating at wavelength and link granularities are experimentally validated in a multi-domain WSON. The strategies are qualitatively compared in terms of resource usage, restorability and ...
    • GMPLS-based multidomain restoration: analysis, strategies, policies and experimental assessment 

      Velasco Esteban, Luis Domingo; Agraz Bujan, Fernando; Martínez, Ricardo; Casellas, Ramon; Spadaro, Salvatore; Muñoz, Raul; Junyent Giralt, Gabriel (IEEE Press. Institute of Electrical and Electronics Engineers, 2010-07-01)
      Article
      Restricted access - publisher's policy
      A connection spanning, for example, several countries crosses multiple optical backbone networks, each one controlled by different administrators or operators. In this context, the interworking of these networks is thus ...
    • LIGHTNESS: a deeply-programmable SDN-enabled data centre network with OCS/OPS Multicast/Unicast switch-over 

      Saridis, JM; Peng, Shpuping; Yan, Yan; Aguado, Alejandro; Buo, Bingli; Arslan, M; Jackson, C; Miao, Wang; Calabretta, Nicola; Agraz Bujan, Fernando; Spadaro, Salvatore; Bernini, Giacomo; Ciulli, Nicola; Zervas, G; Nejabati, Reza; Simeonidou, Dimitra (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Restricted access - publisher's policy
      We demonstrate an all-optical dynamic DCN utilizing a fully SDN-enabled data-plane including programmable FPGA-based NICs, offering Network Function Virtualization OCS/OPS driven multicasting for Virtual DC applications ...
    • LIGHTNESS: a function-virtualizable software defined data center network with all-optical circuit/packet switching 

      Saridis, G. M.; Peng, S.; Yan, Yan; Aguado, A.; Guo, B.; Arslan, M.; Jackson, C.; Miao, W.; Calabretta, N.; Agraz Bujan, Fernando; Spadaro, Salvatore; Bernini, G.; Ciulli, N.; Zervas, G.; Nejabati, R.; Simeonidou, D. (2016-04-01)
      Article
      Open Access
      Modern high-performance data centers are responsible for delivering a huge variety of cloud applications to the end-users, which are increasingly pushing the limits of the currently deployed computing and network infrastructure. ...
    • Multi-tenant software-defined hybrid optical switched data centre 

      Peng, Shuping; Guo, Bingli; Jackson, Chris; Najabati, Reza; Agraz Bujan, Fernando; Spadaro, Salvatore; Bernini, Giacomo; Ciulli, Nicola; Simeonidou, Dimitra (2015-08-01)
      Article
      Open Access
      We introduce a holistic solution for software-defined optical data centres (DC). Hybrid optical circuit/packet switching technologies are employed in the data plane, while a software-defined networking (SDN) controller ...
    • On the experimentation of the novel GCMR multicast routing in a large-scale testbed 

      Careglio, Davide; Papadimitriou, Dimitri; Agraz Bujan, Fernando; Sahhaf, Sahel; Perelló Muntan, Jordi; Tavernier, Wouter (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference lecture
      Open Access
      Originally defined in the 90s, multicast is nowadays (re)gaining interest given the increasing popularity of multimedia streaming/content traffic and the explosion of cloud services. In fact, multicast yields bandwidth ...
    • Optimal VDC service provisioning in optically interconnected disaggregated data centers 

      Pagès Cruz, Albert; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Spadaro, Salvatore (2016-07)
      Article
      Open Access
      Virtual data center (VDC) is a key service in modern data center (DC) infrastructures. However, the rigid architecture of traditional servers inside DCs may lead to blocking situations when deploying VDC instances. To ...
    • Orchestrated SDN-based VDC provisioning over multi-technology optical data centre networks 

      Spadaro, Salvatore; Pagès Cruz, Albert; Agraz Bujan, Fernando; Montero, Rafael; Perelló Muntan, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Open Access
      In this paper, we describe some scenarios and technologies that have been proposed to cope with the requirements of current and next generation data centre infrastructure. In particular, we discuss the extensions that have ...
    • Orchestrating virtual slices in data centre infrastructures with optical DCN 

      Pagès Cruz, Albert; Agraz Bujan, Fernando; Montero Herrera, Rafael; Landi, Giada; Capitani, Marco; Gallico, Domenico; Biancani, Matteo; Nejabati, Reza; Simeonidou, Dimitra; Spadaro, Salvatore (2019-07-01)
      Article
      Open Access
      The emergence of new paradigms and services is pushing the limits of nowadays cloud infrastructures. It is a fact that current solutions lack in the flexibility and configurability to adapt to heterogeneous requirements ...
    • Quality of perception prediction in 5G slices for e-Health services using user-perceived QoS 

      Slimen, Yosra Ben; Balcerzak, Joanna; Pagès Cruz, Albert; Agraz Bujan, Fernando; Spadaro, Salvatore; Koutsopoulos, Konstantinos; Al-Bado, Mustafa; Truong, Thuy; Giardina, Pietro G.; Bernini, Giacomo (Elsevier, 2021-10-01)
      Article
      Restricted access - publisher's policy
      In order to compete for a prominent market share, network operators and service providers should retain and increase the verticals’ subscription, catering to their needs in order to differentiate themselves from competitors. ...