Now showing items 21-37 of 37

    • Impact of aggregation level on the performance of dynamic lightpath adaptation under time-varying traffic 

      Asensio Carmona, Adrian; Klinkowski, Miroslaw; Ruiz Ramírez, Marc; Lopez, Victor Bohorquez; Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      In this article we focus on lightpath adaptation under time-varying traffic in a dynamic elastic optical network (EON) implementing flexgrid optical technology. In the considered scenario, a number of IP/MPLS metro area ...
    • Insights on the Internet routing scalability issues 

      Castro Casales, Alberto; Germán Duarte, Martín; Yannuzzi, Marcelo; Masip Bruin, Xavier (2009-12-14)
      Conference report
      Open Access
      In recent years, the size and dynamics of the global routing table have increased rapidly along with an increase in the number of edge networks. The relation between edge network quantity and routing table size/dynamics ...
    • Managing Interdomain Traffic in Latin America: A New Perspective based on LISP 

      Yannuzzi, Marcelo; Masip Bruin, Xavier; Grampin Castro, Eduardo; Gagliano Molla, Roque; Castro Casales, Alberto; Germán Duarte, Martín (2009-07)
      Article
      Open Access
      The characteristics of Latin American network infrastructures have global consequences, particularly in the area of interdomain traffic engineering. As an example, Latin America shows the largest de-aggregation factor ...
    • Meeting the requirements to deploy cloud RAN over optical networks 

      Velasco Esteban, Luis Domingo; Castro Casales, Alberto; Asensio Garcia, Adrian; Ruiz Ramírez, Marc; Liu, G.; Qin, C.; Proietti, Roberto; Yoo, Sung-Joo Ben (Optical Society of America, 2017-03-01)
      Article
      Open Access
      Radio access network (RAN) cost savings are expected in future cloud RAN (C-RAN). In contrast to traditional distributed RAN architectures, in C-RAN, remote radio heads (RRHs) from different sites can share baseband ...
    • Multipath restoration and bitrate squeezing in SDN-based elastic optical networks [Invited] 

      Paolucci, Francesco; Castro Casales, Alberto; Cugini, Filippo; Velasco Esteban, Luis Domingo; Castoldi, Piero (2014-08-01)
      Article
      Restricted access - publisher's policy
      Sliceable bandwidth-variable transponders (SBVTs) enable the adaptation of transmission parameters according to traffic requirements and network constraints. In this study, SBVTs capabilities are evaluated in the context ...
    • Near real-time estimation of end-to-end performance in converged fixed-mobile networks 

      Bernal Escribano, Álvaro; Richart Gutiérrez, Matías Mario; Ruiz Ramírez, Marc; Castro Casales, Alberto; Velasco Esteban, Luis Domingo (Elsevier, 2020-01-15)
      Article
      Restricted access - publisher's policy
      The independent operation of mobile and fixed network segments is one of the main barriers that prevents improving network performance while reducing capital expenditures coming from overprovisioning. In particular, a ...
    • On the benefits of differentiating the filter configurations in flexi-grid optical networks 

      Castro Casales, Alberto; Cugini, Filippo; Velasco Esteban, Luis Domingo; Castoldi, Piero (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      An effective strategy exploiting differentiated filter configurations in flexi-grid optical networks is proposed and evaluated. Results show that 15% throughput improvements can be achieved with respect to traditional ...
    • On the benefits of multi-path recovery in flexgrid optical networks 

      Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2014-12-01)
      Article
      Restricted access - publisher's policy
      We propose a new recovery scheme, called multi-path recovery (MPR), specifically designed for flexgrid-based optical networks. It combines protection and restoration schemes to jointly recover, in part or totally, the ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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
      Restricted access - publisher's policy
      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 ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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, ...
    • Single-path provisioning with multi-path recovery in flexgrid optical networks 

      Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Comellas Colomé, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Conference report
      Restricted access - publisher's policy
      The new flexgrid technology, in opposition to the fixed grid one traditionally used in wavelength switched optical networks (WSON), allows allocating the spectral bandwidth needed to convey heterogeneous client demand ...
    • Soft failure localization during commissioning testing and lightpath operation 

      Pérez Vela, Alba; Behnam Shariati, Mohammad; Ruiz Ramírez, Marc; Cugini, Filippo; Castro Casales, Alberto; Lu, Hongbo; Proietti, Roberto; Comellas Colomé, Jaume; Castoldi, Piero; Yoo, Sung-Joo Ben; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2017-11-09)
      Article
      Open Access
      In elastic optical networks (EONs), effective soft failure localization is of paramount importance to early detection of service level agreement violations while anticipating possible hard failure events. So far, failure ...
    • Solving routing and spectrum allocation related optimization problems 

      Velasco Esteban, Luis Domingo; Castro Casales, Alberto; Ruiz Ramírez, Marc (2013)
      Conference lecture
      Open Access
      We provide a comprehensible introduction to RSA-related problems in flexgrid networks. Starting from its formulation, we analyze network live cycle and indicate different solving methods for the kind of problems that arise ...
    • Superfilter technique in SDN-controlled elastic optical networks 

      Paolucci, Francesco; Cugini, Filippo; Fresi, Francesco; Meloni, Gianluca; Giorgetti, Alessio; Sambo, Nicola; Poti, Luca; Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Castoldi, Piero (Institute of Electrical and Electronics Engineers (IEEE), 2015-02-01)
      Article
      Restricted access - publisher's policy
      In flexigrid elastic optical networks, filtering cascade effects strongly affect the overall transmission performance. To avoid these detrimental impairments, each lightpath is typically configured, in an independent way, ...
    • The Minimum Coincidence Routing Approach in Wavelength-Routed Optical WDM Networks 

      Grampin Castro, Eduardo; Masip Bruin, Xavier; Germán Duarte, Martín; Castro Casales, Alberto; Marín Tordera, Eva; Serral Gracià, René; Sánchez López, Sergio; Yannuzzi, Marcelo; Gagliano Molla, Roque (IEEE Computer Society Publications, 2009)
      Conference report
      Open Access
      Management is a critical issue in optical networks. Highly impacting in management, routing in optical networks, is often decoupled into both the path selection and the wavelength assignment problems. In the former, ...
    • Towards a carrier SDN: an example for elastic inter-datacenter connectivity 

      Velasco Esteban, Luis Domingo; Berral García, Josep Lluís; Asensio Garcia, Adrian; Castro Casales, Alberto; López, Víctor (2013)
      Conference report
      Open Access
      We propose a network-driven transfer mode for cloud operations in a step towards a carrier SDN. Inter-datacenter connectivity is requested in terms of volume of data and completion time. The SDN controller translates and ...