Now showing items 1-20 of 43

    • A fully SDN enabled all-optical architecture for data centre virtualisation with time and space multiplexing 

      Kondepu, K; Jackson, Chirs; Ou, Y; Pagès Cruz, Albert; Agraz Bujan, Fernando; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2018-07-01)
      Article
      Open Access
      Virtual Data Centre (VDC) solutions provide an environment that is able to quickly scale-up and where virtual machines and network resources can be quickly added on-demand through self-service procedures. VDC providers ...
    • Actuation framework for 5G-enabled network slices with QoE/QoS guarantees 

      Montero, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Spadaro, Salvatore (2019)
      Conference report
      Restricted access - publisher's policy
      Network slicing is identified as the enabling technology for efficient service delivery in future 5G networks. Moreover, a key aspect in 5G network slicing relates to the delivery and maintenance of QoS/QoE guarantees for ...
    • Analysis of performance degradation in sleep-mode enabled core optical networks [invited] 

      Pagès Cruz, Albert; Tornatore, Massimo; Perelló Muntan, Jordi; Spadaro, Salvatore; Morea, Annalisa (Institute of Electrical and Electronics Engineers (IEEE), 2015-03-01)
      Article
      Open Access
      Energy efficiency is an important target for the management of wavelength-division-multiplexing-based core optical networks. A possible power management strategy for energy-efficient optical networks consists in putting ...
    • Analysis of service blocking reduction strategies in capacity-limited disaggregated datacenters 

      Pagès Cruz, Albert; Agraz Bujan, Fernando; Spadaro, Salvatore (2020)
      Conference report
      Restricted access - publisher's policy
      Disaggregated DCs offer multiple benefits. However, transmission capacity limitations at blade level can severely degrade their performance. We analyze several strategies to enhance their service acceptance.
    • Assessment of Flex-grid/SDM backbone networks under inter-core XT-limited transmission reach 

      Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Lázaro Villa, José Antonio; Pagès Cruz, Albert; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Open Access
      In the present paper, we estimate the transmission reach of the optical signals through several state-of-the-art multi-core fibers reported in the literature considering ASE noise and inter-core crosstalk. Using these ...
    • 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 ...
    • Development of a Network Management System for the EU DICONET Project 

      Pagès Cruz, Albert (Universitat Politècnica de Catalunya, 2010)
      Master thesis (pre-Bologna period)
      Open Access
      The objective of the present final project has been the development of a graphical interface for the management plane of the DICONET network. The management plane is the responsible for having a whole network view and ...
    • 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 ...
    • Enabling multi-segment 5G service provisioning and maintenance through network slicing 

      Montero Herrera, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Spadaro, Salvatore (2020-01-03)
      Article
      Open Access
      The current deployment of 5G networks in a way to support the highly demanding service types defined for 5G, has brought the need for using new techniques to accommodate legacy networks to such requirements. Network Slicing ...
    • Enabling multi-tenancy in hybrid optical packet/circuit switched data center networks 

      Peng, Shuping; Nejabati, Reza; Guo, Bingli; Shu, Yan; Zervas, Georgios; Spadaro, Salvatore; Pagès Cruz, Albert; Simeonidou, Dimitra (2014)
      Conference report
      Restricted access - publisher's policy
      In a flattened optical data center network employing hybrid technologies, multi-tenancy is enabled by a new virtual data center embedding method that is equipped with network-aware VM placement exploiting the advanced but ...
    • Enabling service provisioning and quality maintenance in sliceable optical networks 

      Spadaro, Salvatore; Pagès Cruz, Albert; Biosca Caro, Jordi; Agraz Bujan, Fernando (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2021)
      Conference report
      Restricted access - publisher's policy
      Future 5G and beyond services rely on the network slicing concept, in which underlying network elements are split and/or aggregated to compose a synthetic network infrastructure (the slice) to satisfy the requirements of ...
    • 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 ...
    • 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 ...
    • Flex-Grid/SDM backbone network design with inter-core XT-limited transmission reach 

      Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Pagès Cruz, Albert; Lázaro Villa, José Antonio; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2016-08-01)
      Article
      Restricted access - publisher's policy
      Spatial division multiplexing (SDM) has been presented as a key solution to circumvent the nonlinear Shannon limit of standard single-core fibers. To implement SDM, multi-core fiber (MCF) technology becomes a top candidate ...
    • Impact of transponders and regenerators wake-up time on sleep-mode enabled translucent optical networks 

      Pagès Cruz, Albert; Tornatore, Massimo; Perelló Muntan, Jordi; Spadaro, Salvatore; Morea, Annalisa (2014)
      Conference report
      Restricted access - publisher's policy
      Sleep-mode enabled transponders and regenerators yield to substantial energy savings; however, their non-negligible wake-up time may degrade the network performance. We show that an appropriate dimensioning of the devices ...
    • Lightpath fragmentation for efficient spectrum utilization in dynamic elastic optical networks 

      Pagès Cruz, Albert; Perelló Muntan, Jordi; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Conference report
      Open Access
      The spectrum-sliced elastic optical path network (SLICE) architecture has been presented as an efficient solution for flexible bandwidth allocation in optical networks. An homologous problem to the classical Routing and ...
    • On the benefits of resource disaggregation for virtual data centre provisioning in optical data centres 

      Pagès Cruz, Albert; Serrano, Ruben; Perelló Muntan, Jordi; Spadaro, Salvatore (2017-07-15)
      Article
      Open Access
      Virtual Data Centre (VDC) allocation requires the provisioning of both computing and network resources. Their joint provisioning allows for an optimal utilization of the physical Data Centre (DC) infrastructure resources. ...