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  • ARQUITECTURA CON CONOCIMIENTO DEL ENTORNO DE LA FUTURA INTERNET

     Santos Boada, German; Sole Pareta, Josep; Barlet Ros, Pere; Hesselbach Serra, Xavier; Raspall Chaure, Federico; De Almeida Amazonas, Jose Roberto; Marzo Lázaro, José Luis; Fàbrega Soler, LLuís; Vilà Talleda, Pere; Calle Ortega, Eusebio
    Competitive project

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    Innovative techniques for power consumption saving in telecommunication networks  Open access

     Hesselbach Serra, Xavier; Eramo, Vicenzo; Luo, Yan
    Journal of Electrical and Computer Engineering
    Vol. 2014, p. 1-2
    DOI: 10.1155/2014/684987
    Date of publication: 2014-05-05
    Journal article

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  • Virtual Infrastructures as a service enabling converged optical networks and Data Centres

     Ferrer Riera, Jordi; Tzanakaki, Anna; Antonescu, Alexandru-Florian; Anastasopoulos, Markos; García Espin, Joan Antoni; Escalona Zorita, Eduard; Peng, Shuping; Landi, Giada; Bernini, Giacomo; Belter, Bartosz; Parniewicz, Damian; Hesselbach Serra, Xavier; Figuerola Fernandez, Sergi; Simeonidou, Dimitra
    Optical switching and networking
    Vol. 14, num. 3, p. 197-208
    DOI: 10.1016/j.osn.2014.05.017
    Date of publication: 2014-08
    Journal article

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    Cloud computing service emerged as an essential component of the Enterprise IT infrastructure. Migration towards a full range and large-scale convergence of Cloud and network services has become the current trend for addressing requirements of the Cloud environment. Our approach takes the infrastructure as a service paradigm to build converged virtual infrastructures, which allow offering tailored performance and enable multi-tenancy over a common physical infrastructure. Thanks to virtualization, new exploitation activities of the physical infrastructures may arise for both transport network and Data Centres services. This approach makes network and Data Centres' resources dedicated to Cloud Computing to converge on the same flexible and scalable level. The work presented here is based on the automation of the virtual infrastructure provisioning service. On top of the virtual infrastructures, a coordinated operation and control of the different resources is performed with the objective of automatically tailoring connectivity services to the Cloud service dynamics. Furthermore, in order to support elasticity of the Cloud services through the optical network, dynamic re-planning features have been provided to the virtual infrastructure service, which allows scaling up or down existing virtual infrastructures to optimize resource utilization and dynamically adapt to users' demands. Thus, the dynamic re-planning of the service becomes key component for the coordination of Cloud and optical network resource in an optimal way in terms of resource utilization. The presented work is complemented with a use case of the virtual infrastructure service being adopted in a distributed Enterprise Information System, that scales up and down as a function of the application requests. © 2014 Elsevier B.V.

  • On the complex scheduling formulation of virtual network functions over optical networks

     Ferrer Riera, Jordi; Hesselbach Serra, Xavier; Escalona Zorita, Eduard; García Espin, Joan Antoni; Grasa, Eduard
    International Conference on Transparent Optical Networks
    p. 6876564-1-6876564-5
    DOI: 10.1109/ICTON.2014.6876564
    Presentation's date: 2014-07
    Presentation of work at congresses

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    Software-Defined Networking and Network Functions Virtualisation has brought a revolution within the telecom market landscape. Initial proof-of-concept prototypes for NFV-enabled solutions are being developed at the same time SDN models are identified as the futures solutions within the telecom realm. We provide in this article an overview of the SDN/NFV technologies over optical networks, as well as we provide the first formalisation model for the virtual network function complex scheduling problem. The article aims at being used as starting point in order to optimally solve the scheduling problem of virtual network functions that compose network services to be provisioned within the SDN paradigm.

  • Greener networking in a network virtualization environment

     Botero Vega, Juan Felipe; Hesselbach Serra, Xavier
    Computer networks
    Vol. 57, num. 9, p. 2021-2039
    DOI: 10.1016/j.comnet.2013.04.004
    Date of publication: 2013-06-19
    Journal article

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    Energy consumption of network operators can be minimized by the dynamic and smart relocation of networking resources. In this paper, we propose to take advantage of network virtualization to enable a smart energy aware network provisioning. The virtualization of networking resources leads to the problem of mapping virtual demands to physical resources, known as Virtual Network Embedding (VNE). Our proposal modifies and improves exact existing energy aware VNE proposals where the objective is to switch off as many network nodes and interfaces as possible by allocating the virtual demands to a consolidated subset of active physical networking equipment. As exact energy efficient VNE approaches are hard to solve for large network sizes and have an adverse effect in the number of successful embeddings, an heuristic approach to reconfigure the allocation of already embedded virtual networks, minimizing the energy consumption, is also proposed.

  • A novel collaboration paradigm for reducing energy consumption and carbon dioxide emissions in data centres

     Rincon Rivera, David; Agusti Torra, Anna; Botero Vega, Juan Felipe; Raspall Chaure, Federico; Remondo Bueno, David; Hesselbach Serra, Xavier; Beck, Michael Till; de Meer, Hermann; Niedermeier, F; Giuliani, Giovanni
    The Computer journal (paper)
    Vol. 56, num. 12, p. 1518-1536
    DOI: 10.1093/comjnl/bxt053
    Date of publication: 2013-12-01
    Journal article

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    This work describes a novel approach for the reduction of energy consumption in data centres (DCs) that will yield benefits both in terms of running costs and its environmental impact. The method is based on the introduction of collaborative interactions and flexibility clauses in contracts between all the DC ecosystem entities. The included entities are all the actors along the energy production¿consumption chain, from the energy provider to the Information Technology customer. The collaborative approach also integrates the interaction between federated DCs. In this paper, we find a detailed description of the architecture that enables interaction between the DC ecosystem parties, which is designed to be progressively deployed, allowing traditional and `greened¿ services to coexist, and without modification of the existing DC automation and framework systems.

  • Virtual network embedding: a survey

     Fischer, Andreas; Botero Vega, Juan Felipe; Beck, Michael Till; de Meer, Hermann; Hesselbach Serra, Xavier
    IEEE Communications Surveys & Tutorials
    Vol. 15, num. 4, p. 1888-1906
    DOI: 10.1109/SURV.2013.013013.00155
    Date of publication: 2013-10
    Journal article

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    Network virtualization is recognized as an enabling technology for the future Internet. It aims to overcome the resistance of the current Internet to architectural change. Application of this technology relies on algorithms that can instantiate virtualized networks on a substrate infrastructure, optimizing the layout for service-relevant metrics. This class of algorithms is commonly known as Virtual Network Embedding (VNE) algorithms. This paper presents a survey of current research in the VNE area. Based upon a novel classification scheme for VNE algorithms a taxonomy of current approaches to the VNE problem is provided and opportunities for further research are discussed. © 1998-2012 IEEE.

    Network virtualization is recognized as an enabling technology for the future Internet. It aims to overcome the resistance of the current Internet to architectural change. Application of this technology relies on algorithms that can instantiate virtualized networks on a substrate infrastructure, optimizing the layout for service-relevant metrics. This class of algorithms is commonly known as "Virtual Network Embedding (VNE)" algorithms. This paper presents a survey of current research in the VNE area. Based upon a novel classification scheme for VNE algorithms a taxonomy of current approaches to the VNE problem is provided and opportunities for further research are discussed.

  • A novel paths algebra-based strategy to flexibly solve the link mapping stage of VNE problems

     Botero Vega, Juan Felipe; Molina, Miguel; Hesselbach Serra, Xavier; De Almeida Amazonas, Jose Roberto
    Journal of network and computer applications
    Vol. 36, num. 6, p. 1735-1752
    DOI: 10.1016/j.jnca.2013.02.029
    Date of publication: 2013-11
    Journal article

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    One of the main challenges of network virtualization is the virtual network embedding problem (VNE) that consists of mapping virtual network demands in physical network resources. VNE can be decomposed into two stages: virtual node and virtual link mapping. In the first stage, each virtual node is mapped to a suitable node in the physical network whereas the second stage is in charge of mapping the links connecting virtual nodes to paths in the physical network that suit the virtual network demands. In this paper we propose the utilization of a mathematical multi-constraint routing framework called "paths algebra" to solve the virtual link mapping stage. Paths algebra provides the flexibility to introduce an unlimited number of linear and non-linear constraints and metrics to the problem while finding all the eligible paths in the physical network to perform the virtual link mapping resulting in better and more flexible embeddings

    One of the main challenges of network virtualization is the virtual network embedding problem (VNE) that consists of mapping virtual network demands in physical network resources. VNE can be decomposed into two stages: virtual node and virtual link mapping. In the first stage, each virtual node is mapped to a suitable node in the physical network whereas the second stage is in charge of mapping the links connecting virtual nodes to paths in the physical network that suit the virtual network demands. In this paper we propose the utilization of a mathematical multi-constraint routing framework called “paths algebra” to solve the virtual link mapping stage. Paths algebra provides the flexibility to introduce an unlimited number of linear and non-linear constraints and metrics to the problem while finding all the eligible paths in the physical network to perform the virtual link mapping resulting in better and more flexible embeddings.

  • Study, evaluation and contributions to new algorithms for the embedding problem in a network virtualization enviroment  Open access

     Botero Vega, Juan Felipe
    Department of Telematics Engineering, Universitat Politècnica de Catalunya
    Theses

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    Network virtualization is recognized as an enabling technology for the future Internet. It aims to overcome the resistance of the current Internet to architectural change and to enable a new business model decoupling the network services from the underlying infrastructure. The problem of embedding virtual networks in a substrate network is the main resource allocation challenge in network virtualization and is usually referred to as the Virtual Network Embedding (VNE) problem. VNE deals with the allocation of virtual resources both in nodes and links. Therefore, it can be divided into two sub-problems: Virtual Node Mapping where virtual nodes have to be allocated in physical nodes and Virtual Link Mapping where virtual links connecting these virtual nodes have to be mapped to paths connecting the corresponding nodes in the substrate network. Application of network virtualization relies on algorithms that can instantiate virtualized networks on a substrate infrastructure, optimizing the layout for service-relevant metrics. This class of algorithms is commonly known as VNE algorithms. This thesis proposes a set of contributions to solve the research challenges of the VNE that have not been tackled by the research community. To do that, it performs a deep and comprehensive survey of virtual network embedding. The first research challenge identified is the lack of proposals to solve the virtual link mapping stage of VNE using single path in the physical network. As this problem is NP-hard, existing proposals solve it using well known shortest path algorithms that limit the mapping considering just one constraint. This thesis proposes the use of a mathematical multi-constraint routing framework called paths algebra to solve the virtual link mapping stage. Besides, the thesis introduces a new demand caused by virtual link demands into physical nodes acting as intermediate (hidden) hops in a path of the physical network. Most of the current VNE approaches are centralized. They suffer of scalability issues and provide a single point of failure. In addition, they are not able to embed virtual network requests arriving at the same time in parallel. To solve this challenge, this thesis proposes a distributed, parallel and universal virtual network embedding framework. The proposed framework can be used to run any existing embedding algorithm in a distributed way. Thereby, computational load for embedding multiple virtual networks is spread across the substrate network Energy efficiency is one of the main challenges in future networking environments. Network virtualization can be used to tackle this problem by sharing hardware, instead of requiring dedicated hardware for each instance. Until now, VNE algorithms do not consider energy as a factor for the mapping. This thesis introduces the energy aware VNE where the main objective is to switch off as many network nodes and interfaces as possible by allocating the virtual demands to a consolidated subset of active physical networking equipment. To evaluate and validate the aforementioned VNE proposals, this thesis helped in the development of a software framework called ALgorithms for Embedding VIrtual Networks (ALEVIN). ALEVIN allows to easily implement, evaluate and compare different VNE algorithms according to a set of metrics, which evaluate the algorithms and compute their results on a given scenario for arbitrary parameters.

  • A generic architecture for Demand Response: the All4Green approach

     Basmadjian, Robert; Lovasz, Gergö; Beck, Michael Till; de Meer, Hermann; Hesselbach Serra, Xavier; Botero Vega, Juan Felipe; Klingert, Sonja; Pérez Ortega, María; López, Juan Carlos; Stam, Andries; van Krevelen, Rick; di Girolamo, marco
    International Workshop on European Actions towards Eco-friendly Data Centers
    p. 464-471
    DOI: 10.1109/CGC.2013.79
    Presentation's date: 2013-09-30
    Presentation of work at congresses

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    Demand Response is a mechanism used in power grids to manage customers¿ power consumption during critical situations (e.g. power shortage). Data centres are good candidates to participate in Demand Response programs due to their high energy use. In this paper, we present a generic architecture to enable Demand Response between Energy Provider and Data Centres realised in All4Green. To this end, we show our three-level concept and then illustrate the building blocks of All4Green¿s architectural design. Furthermore, we introduce the novel aspects of GreenSDA and GreenSLA for Energy Provider¿Data centre sub-ecosystem as well as Data centre¿IT Client sub-ecosystem respectively. In order to further reduce energy consumption and CO2 emission, the notion of data centre federation is introduced: savings can be expected if data centres start to collaborate by exchanging workload. Also, we specify the technological solutions necessary to implement our proposed architectural approach. Finally, we present preliminary proof-of-concept experiments, conducted both on traditional and cloud computing data centres, which show relatively encouraging results.

    Demand Response is a mechanism used in power grids to manage customers’ power consumption during critical situations (e.g. power shortage). Data centres are good candidates to participate in Demand Response programs due to their high energy use. In this paper, we present a generic architecture to enable Demand Response between Energy Provider and Data Centres realised in All4Green. To this end, we show our three-level concept and then illustrate the building blocks of All4Green’s architectural design. Furthermore, we introduce the novel aspects of GreenSDA and GreenSLA for Energy Provider–Data centre sub-ecosystem as well as Data centre–IT Client sub-ecosystem respectively. In order to further reduce energy consumption and CO2 emission, the notion of data centre federation is introduced: savings can be expected if data centres start to collaborate by exchanging workload. Also, we specify the technological solutions necessary to implement our proposed architectural approach. Finally, we present preliminary proof-of-concept experiments, conducted both on traditional and cloud computing data centres, which show relatively encouraging results.

  • Energy and carbon emissions aware services allocation with delay for Data Centers

     Guillén, Bernat; Hesselbach Serra, Xavier; Muñoz Lopez, Francisco Javier; Klingert, Sonja
    Jornadas de Ingeniería Telemática
    p. 55-61
    Presentation's date: 2013-10-28
    Presentation of work at congresses

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    This paper presents a new approach to service assignment in Data Centers (DC), relating it to a classical combinatory problem called Bin Packing Problem and adding the possibility of delay and collaboration with users and energy providers. This possibility proves to reduce in much the energy consumption of the DC as well as the CO2 emissions.

  • GreenSLAs: providing energy consumption flexibility in DCs through energy-aware contracts

     Botero Vega, Juan Felipe; Klingert, Sonja; Hesselbach Serra, Xavier; Falcone, Antonella; Giuliani, Giovanni
    International Conference on Smart Grids and Green IT Systems
    p. 119-122
    Presentation's date: 2013-05-09
    Presentation of work at congresses

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    This paper describes how eco-motivated extensions added to the traditional SLA concept can provide levels of flexibility in the data centre management that enable the data centre to reduce the energy consumption, improve the environmental footprint and lower internal costs. A close collaboration with both the IT customer and the data centre¿s energy provider are key to this approach which is formalized by means of the GreenSLA concept building on the three main components: Flexibility, GreenKPIs and collaboration. Performance decisions regarding the energy consumed by the services are taken and translated to actions to be executed to save energy while at the same time guaranteeing the contract agreements.

  • A distributed, parallel, and generic virtual network embedding framework

     Beck, Michael Till; Fischer, Andreas; de Meer, Hermann; Botero Vega, Juan Felipe; Hesselbach Serra, Xavier
    IEEE International Conference on Communications
    p. 3471-3475
    DOI: 10.1109/ICC.2013.6655087
    Presentation's date: 2013-06
    Presentation of work at congresses

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    One of the main challenges of network virtualization is the mapping of virtual network demands to physical network resources, commonly known as the virtual network embedding (VNE) problem. This paper introduces DPVNE, a distributed, parallel and generic VNE framework. DPVNE can be used 1) to run various cost-reducing embedding algorithms 2) in a distributed way. Thereby, computational load for embedding multiple virtual networks is spread across the substrate network reducing workload of individual nodes and 3) enabling the embedding of multiple virtual networks in parallel. DPVNE, in contrast to existing distributed algorithms, 4) achieves lower message overhead and, despite of being distributed, 5) keeps embedding costs comparable to those of centralized approaches.

  • A data center control architecture for power consumption reduction

     Botero Vega, Juan Felipe; Rincon Rivera, David; Agusti Torra, Anna; Hesselbach Serra, Xavier; Raspall Chaure, Federico; Remondo Bueno, David; Barba Marti, Antonio; Barone, Paolo; Giuliani, Giovanni
    International Workshop on Energy-Efficient Data Centres
    p. 1-12
    Presentation's date: 2013-05-21
    Presentation of work at congresses

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    In recent years, the emergence of the cloud computing has increased the need of resources to support cloud-based services. Therefore, the role of the data centers has become essential. Following the growing of services, the power consumption has increased dramatically, while the need for energy savings and CO2 reduction has become a requirement for a sustainable world. The All4Green project fosters collaboration between energy providers (EP), data centers (DC) and customers/end users (EU) in order to provide energy sav-ings and CO2 emissions reduction. In this architecture, the contract binding EPs and DCs includes flexibility terms in order to allow the collaboration in the form of discounts that can be transferred also to DC customers, if they are willing to collaborate.

  • Internet future architectures for network and media independent services and protocols

     Alcober Segura, Jesus Angel; Hesselbach Serra, Xavier; De La Oliva, Antonio; Garcia Saavedra, Andres; Roldan, David; Bock, Carlos
    International Conference on Transparent Optical Networks
    p. Mo.B1.4-1-Mo.B1.4-4
    DOI: 10.1109/ICTON.2013.6602680
    Presentation's date: 2013-06
    Presentation of work at congresses

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    Current Internet has become an essential communication infrastructure, not only for information transfer but also as a key component of social infrastructures, such as e-government, energy/traffic controls, finance, learning, health, etc. Even though the Internet has evolved towards high-bandwidth network architectures offering transparent transport services for fixed and mobile applications, its future depends on how it is going to cope with several concerns on different aspects such as scalability, ubiquity, security, robustness, mobility, heterogeneity, Quality of Service (QoS), re-configurability, context-awareness, manageability, data-centric, economics, etc. This paper exposes the approaches proposed in the Spanish Government funded research project tin2010-20136-c03 to overcome identified drawbacks of the current internet, such as energy efficiency, network ossification, heterogeneity of information and coexistence of optical and wireless networks. In order to do so, two technologies have been identified as potential solutions to face some of these problems: i) Media Independence and ii) Virtualization. On the one hand, Media Independence enables the decoupling of the control plane from the physical technology specificities, by introducing an abstract control API to configure, monitor and command the physical interface. On the other hand, network virtualization strategies allow the partition of electrical and optical network infrastructures into multiple parallel, dedicated virtual networks for a physical infrastructure sharing purpose, and enables the creation of overlay networks spanning multiple technologies and realms, hence being a very useful tool for context-aware service composition.

  • Energy efficient virtual network embedding

     Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Duelli, Michael; Schlosser, Daniel; Fischer, A.; de Meer, Hermann
    IEEE communications letters
    Vol. 16, num. 5, p. 756-759
    DOI: 10.1109/LCOMM.2012.030912.120082
    Date of publication: 2012-05
    Journal article

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    Waste of energy due to over-provisioning and overdimensioning of network infrastructures has recently stimulated the interest on energy consumption reduction by Internet Service Providers (ISPs). By means of resource consolidation, network virtualization based architectures will enable energy saving. In this letter, we extend the well-known virtual network embedding problem (VNE) to energy awareness and propose a mixed integer program (MIP) which provides optimal energy efficient embeddings. Simulation results show the energy gains of the proposed MIP over the existing cost-based VNE approach.

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    Optimal mapping of virtual networks with hidden hops  Open access

     Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Fischer, Andreas; de Meer, Hermann
    Telecommunication systems
    Vol. 51, num. 4, p. 273-282
    DOI: 10.1007/s11235-011-9437-0
    Date of publication: 2012-12-01
    Journal article

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    Network virtualization has emerged as a solution for the Internet inability to address the required challenges caused by the lack of coordination among Internet service providers for the deployment of new services. The allocation of resources is one of the main problems in network virtualization, mainly in the mapping of virtual nodes and links to specific substrate nodes and paths, also known as the virtual network embedding problem. This paper proposes an algorithm based on optimization theory, to map the virtual links and nodes requiring a specific demand, looking for the maximization of the spare bandwidth and spare CPU in the substrate network, taking into account the CPU demanded by the hidden hops when a virtual link is mapped. The components of the virtual networks (nodes and links) that do not ask for an specific demand are then allocated following a fairness criteria

    Postprint (author’s final draft)

  • Design and analysis of a framework to enhance optical network utilization resources by means of virtualization

     Hesselbach Serra, Xavier; Naumenko, Nikolay
    International Conference on Transparent Optical Networks
    p. 1-5
    DOI: 10.1109/ICTON.2012.6254480
    Presentation's date: 2012
    Presentation of work at congresses

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    The time for an all-optical network is already here. The huge capacity of the optical resources, in backbones, distribution and access networks cannot be completely used by current services. The remainders can be used under the deployment of new models for service provisio ning. Network virtualizati on is considered as a serious candidate to enable the flexibl e provision of services in the future Internet. This paper introduces a framework to enhance network virtualization allocati on in optical networks. To increase resources utilization efficiency, a new layer above virtualized elements is introduced to map the demands over the resour ces and infrastructures. For that layer, a strategy based on a resource squa tting model is presented, modeled and analyzed.

  • Active Collaboration in data centre ecosystems to rduce energy consumptions and GHG emissions

     Barba Marti, Antonio; Botero Vega, Juan Felipe; Raspall Chaure, Federico; Remondo Bueno, David; Agusti Torra, Anna; Rincon Rivera, David; Hesselbach Serra, Xavier
    Competitive project

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  • Internet future architecture services and virtualization

     Mataix Oltra, Jorge; Hesselbach Serra, Xavier; Oller Arcas, Antonio; Domingo Aladren, Maria Del Carmen; Barba Marti, Antonio; Botero Vega, Juan Felipe; Piney Da Silva, Jose Ramon; González Cela, Alberto José; Alcober Segura, Jesus Angel
    Competitive project

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  • ALEVIN - A framework to develop, compare, and analyze virtual network embedding algorithms

     Fischer, Andreas; Botero Vega, Juan Felipe; Duelli, Michael; Schlosser, Daniel; Hesselbach Serra, Xavier; de Meer, Hermann
    Workshop on Challenges and Solutions for Network Virtualization
    p. 1-12
    Presentation's date: 2011-03-10
    Presentation of work at congresses

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  • A squatting based framework to enhance network virtualization allocation in optical networks

     Hesselbach Serra, Xavier; Naumenko, Nikolay
    International Conference on Transparent Optical Networks
    p. 1-5
    Presentation's date: 2011-06-27
    Presentation of work at congresses

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    This paper introduces a framework to enhance network virtualization allocation in optical networks. A new control plane approach for the new generation of electrical and optical networks technologies is presented. To increase resources utilization efficiency, a new layer above virtualized elements is introduced in order to take into account the demands in order to control the resources and infrastructures below. For that layer, a strategy based on a resource squatting model is presented.

  • Construyendo redes empleando recursos prestados de otros

     Madriles, Oriol; Hesselbach Serra, Xavier
    Jornadas de Ingeniería Telemática1
    p. 389-392
    Presentation's date: 2011-09-29
    Presentation of work at congresses

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  • Transport over heterogeneous networks using the RINA architecture

     Trouva, Eleni; Grasa, E.; Day, John; Matta, Ibrahim; Chitkushev, Lubomir T.; Bunch, Steve; Ponce de Leon, M.; Phelan, Patrick; Hesselbach Serra, Xavier
    International Conference on Wired/Wireless Internet Communications
    p. 1-12
    Presentation's date: 2011-06
    Presentation of work at congresses

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  • VNREAL: Virtual network resource embedding algorithms in the framework ALEVIN

     Duelli, Michael; Schlosser, Daniel; Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Fischer, A.; de Meer, Hermann
    Conference on Next Generation Internet Design and Engineering
    p. 1-2
    DOI: 10.1109/NGI.2011.5985874
    Presentation's date: 2011-06-27
    Presentation of work at congresses

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    Network virtualization is recognized as an enabling technology for the Future Internet that overcomes network ossification. However, it introduces a set of challenges. In any network virtualization environment, the problem of optimally mapping virtual resources to physical resources, known as virtual network embedding (VNE), is a critical challenge. Several algorithms attempting to solve this problem have been proposed in literature, so far. However, comparison of existing and new VNE algorithms is hard, as each algorithm focuses on different criteria. To that end, the VNREAL project introduces ALEVIN, a framework to compare different algorithms according to a set of metrics, easily incorporate new VNE algorithms, and evaluate these algorithms on a given scenario for arbitrary parameters.

  • Comparacion de algoritmos para el mapeo de redes virtuales

     Botero Vega, Juan Felipe; Hesselbach Serra, Xavier
    Jornadas de Ingeniería Telemática1
    p. 324-331
    Presentation's date: 2011-09-28
    Presentation of work at congresses

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    La virtualizacion de red es reconocida como una de las principales tecnologías que formara parte del Internet del futuro. Mediante ella, la actual inhabilidad de Internet para desarrollar e implementar nuevos servicios, causada por la falta de coordinacion entre los proveedores de servicio, podrá ser superada. Aplicar virtualización a los recursos de red nos lleva al problema de asignacion de recursos consistente en asignar (mapear) de manera optima los recursos de la red física a los nodos y enlaces de las redes virtuales, comunmente este problema se ha denominado “problema de incrustar o mapear redes virtuales”. En este artículo se muestran las principales estrategias que han sido propuestas para resolver de manera optima este problema y se comparan teniendo en cuenta varias metricas.

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    Flexible VNE algorithms analysis using ALEVIN  Open access

     Botero Vega, Juan Felipe; Hesselbach Serra, Xavier; Duelli, Michael; Schlosser, Daniel; Fischer, A.; de Meer, Hermann
    Würzburg Workshop on IP: Joint ITG and Euro-NF Workshop "Visions of Future Generation Networks"
    p. 47-48
    Presentation's date: 2011-08-01
    Presentation of work at congresses

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    Network virtualization is recognized as an enabling technology for the Future Internet that overcomes network ossification. However, it introduces a set of challenges. In any network virtualization environment, the problem of optimally mapping virtual demands to physical resources, known as virtual network embedding (VNE), is a crucial challenge. This paper analyses the behaviour of the main algorithms proposed to solve VNE by means of the ALEVIN framework. The VNE algorithms are evaluated with regard to appropriate metrics such as: cost, revenue, and virtual network acceptance ratio. We also analyse the impact of the recently introduced hidden hop demand concept in the performance of the VNE algorithms.

  • Redes de comunicaciones: de la telefonía móvil a Internet

     Beltran Sanchidrian, Victòria; Calveras Auge, Ana M.; Casademont Serra, Jordi; Casals Ibañez, Lluis; Catalan Cid, Maria Luisa; Catalan Cid, Miguel; Garcia Villegas, Eduard; Gomez Montenegro, Carlos; Hesselbach Serra, Xavier; Lopez Aguilera, Maria Elena; Paradells Aspas, Jose; Sánchez Loro, Xavier; Vidal Ferre, Rafael
    Date of publication: 2010-12-01
    Book

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  • Identificació de punts de col·laboració amb la Wollo University

     Vidal Lopez, Eva Maria; Torres Urgell, Luis; Aguilar Igartua, Mónica; Prat Viñas, Luis; Muñoz Lopez, Francisco Javier; Fernandez Muñoz, Marcel; Hesselbach Serra, Xavier; Aragones Cervera, Xavier
    Competitive project

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  • MANTYCHORE IP NETWORKS AS A SERVICE

     Hesselbach Serra, Xavier; Botero Vega, Juan Felipe
    Competitive project

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  • Minimization of Congestion in MPLS Networks by means of Flows Optimization Techniques

     Huerta, Mónica; Hesselbach Serra, Xavier; Fabregat, Ramon; Padilla, Jhon; Ravelo, Oswaldo; Clotet Martinez, Roger
    Revista IEEE América Latina
    Vol. 5, num. 5, p. 352-359
    DOI: 10.1109/TLA.2007.4378528
    Date of publication: 2010-11-12
    Journal article

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    E3MS: A traffic engineering prototype for autoprovisioning services in IP/DiffServ/MPLS networks  Open access

     Hesselbach Serra, Xavier; García Espin, Joan Antoni; Gonzalez, Miquel; Gonzalo, Javier; Figuerola Fernandez, Sergi
    Jornadas de Ingeniería Telemática1
    Presentation's date: 2010-09-30
    Presentation of work at congresses

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    This paper presents the testbed definition, implementation and trials of a new strategy for traffic autoprovisioning for MPLS and IP/DiffServ. This is the proof of concept of a new scenario for traffic engineering, for selfconfiguring control and end-to-end quality of service management by means of a tool based on Web Services. The system is structured in 3 layers: A Graphical User Interface, a Network Elements layer (an interface to physical devices) and, in the middle, a Network Management System layer, where decisions about admission, load balancing, path selection, rerouting and bandwidth allocation per class are taken. The system includes Dynamic Resource Allocation (DRA) and Background Monitoring System (BMS) modules to globally manage network resources. The so-called Squatter and Legalization mechanisms are introduced as novelties added to traffic engineering. Those strategies permit the use of part of the available resources from other classes only while unused by the class owning them. The trials hav validated the management system, using Cisco routers.

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    MANTICORE II: IP Network as a Service Pilots at HEAnet, NORDUnet and RedIRIS  Open access

     Grasa Gras, Eduard; Figuerola Fernandez, Sergi; Barrera, Xavier; Ferrao, Laia; Baez, Carlos; Minoves, Pau; Hesselbach Serra, Xavier; Botero Vega, Juan Felipe; Reijs, Victor; Wilson, Dave; Fischer, Lars; de Miguel, Tomas P.; Uze, Jean Marc; Lonvich, Chris; Simeonidou, Dimitra; Cabello, Isidro
    Terena Networking Conference
    Presentation's date: 2010-06-02
    Presentation of work at congresses

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    MANTICORE II follows the Infrastructure as a Service (IaaS) paradigm to enable National Research and Education Networks (NRENs) and other e-infrastructure providers to enhance their service portfolio by building and piloting the deployment of tools to provide infrastructure resources and IP networks as a service to virtual research communities. MANTICORE II is carrying out the following activities: * Robust and modular implementation of IaaS management tools. * Pilot software deployment and evaluation at HEAnet, NORDUnet and RedIRIS. * Design and implement a simple yet powerful graphical interface for the IP Network Service. * Study and simulate mechanisms to implement an infrastructure marketplace. * Study business models and use cases for commercial services based on MANTICORE II principles.

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    Generalized cognitive networks of virtual resources  Open access

     Manzalini, A; Moiso, Corrado; Minerva, R.; Hesselbach Serra, Xavier; Sole Pareta, Josep; Botero Vega, Juan Felipe
    Workshop in G/MPLS Networks
    Presentation's date: 2010-07-06
    Presentation of work at congresses

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    The pervasive distribution of digital devices (e.g., laptops, mobile phone, digital camera, music players, RFID, sensors, smart cards) will create a large distributed computational and networking environment that will foster the evolution towards ecosystems of resource, services and data. Dynamicity and ubiquity of said future environments pose new challenges and requirements that current infrastructures cannot meet. Several limitations have to be overcomed, for instance: low flexibility and scalability, missing optimized cross-layer/cognitive (and cross-domain) resources allocation, limited potentialities of fostering new business models and above all a brittle integration of IT and network solutions/technologies. This paper proposes a systemic design to develop a future network architecture overcoming said limitations. Architecture is based on three main decentralised planes: the Knowledge Plane (KP), the Network Control Plane (NCP) and the Resource Control Plane (RCP). The three planes are implemented a distributed way and interact with each other (through a signalling overlay) for the allocation and management of virtual (communication, storage and processing) resources in overlay networks: novelty stands in coupling some enabling technologies with the creation and use of a cross-layer network knowledge. Paper also presents, as an example, some simulation results showing the optimal allocation of resources for the proposed architecture. Eventually, recommendations and future work conclude the paper.

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    Squat-based resource management strategy for enabling shared infrastructures over optical networks  Open access

     García Espin, Joan Antoni; Hesselbach Serra, Xavier
    International Conference on Transparent Optical Networks
    Presentation's date: 2010-06-28
    Presentation of work at congresses

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    This paper proposes a new paradigm and strategy for resource management in optical networks considering that resources allocated to a user or service can be squatted in by third parties temporarily in order to provide support for emergency situations or allocate traffic from different priorities that experience a sudden increase of demanded resources in the network. We introduce the strategies of Soft Squatting and Hard Squatting. Moreover, we propose a model and a preliminary evaluation for fibre infrastructure sharing in all-optical networks using the proposed squatting strategies.

  • XARXES I SERVEIS DE BANDA AMPLA

     Hesselbach Serra, Xavier; Cervelló Pastor, Cristina; Barba Marti, Antonio; Gutierrez Gonzalez, Luis Maria; Raspall Chaure, Federico; Remondo Bueno, David; Agusti Torra, Anna; Domingo Aladren, Maria Del Carmen; Oller Arcas, Antonio; Rincon Rivera, David; Mataix Oltra, Jorge; Triay Marques, Joan; Alcober Segura, Jesus Angel; Guasch Murillo, Daniel; Sallent Ribes, Sebastia
    Competitive project

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  • Estrategia de asignación de recursos basada en criterios de justicia para las interfaces de encaminadores lógicos IP

     Felipe, Juan Botero; Hesselbach Serra, Xavier; Muñoz Lopez, Francisco Javier
    Jornadas de Ingeniería Telemática1
    p. 415-418
    Presentation of work at congresses

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  • Problems in dynamic bandwidth allocation in connection oriented networks

     Hesselbach Serra, Xavier
    DOI: 10.1007/978-3-642-02250-0
    Date of publication: 2009
    Book chapter

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  • Herramienta de análisis para el diseño y dimensionado de redes IP/MPLS mediante software de emulación de red

     Alfredo, García; Hesselbach Serra, Xavier
    Jornadas de Ingeniería Telemática1
    p. 419-422
    Presentation of work at congresses

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  • Create your own IP network using other people's routers: The Manticore II project

     Hesselbach Serra, Xavier; Grasa Gras, Eduard; Figuerola Fernandez, Sergi
    Trans-European Research and Education Networking Conference
    Presentation's date: 2009-06-09
    Presentation of work at congresses

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    Optimization model for bandwidth allocation in a network virtualization environment  Open access

     Botero Vega, Juan Felipe; Hesselbach Serra, Xavier
    Future Internet Architectures: New Trends in Service Architectures
    Presentation's date: 2009-06-09
    Presentation of work at congresses

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    Bandwidth allocation is one of the main problems in network virtualization. Mechanisms to allocate bandwidth may avoid bottlenecked virtual links. This paper proposes a model based on optimization theory, to distribute the bandwidth among virtual links looking for the minimization of the spare bandwidth in the substrate network.

  • The Bottlenecked Virtual Network Problem in Bandwidth Allocation for Network Virtualization

     Botero Vega, Juan Felipe; Hesselbach Serra, Xavier
    IEEE Latin-American Conference on Communications
    p. 170-174
    Presentation's date: 2009
    Presentation of work at congresses

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    Internet is becoming unable to overcome the challenges required by new services due to the lack of coordination among Internet service providers. This situation, frequently called network ossification, makes increasingly hard the deployment and the testing new network technologies. Network Virtualization has emerged as one solution of this problem. One network (substrate network), composed of physical nodes (e.g. routers) interconnected by means of links, may be used to create several isolated virtual networks, formed by virtual nodes and links, sharing the physical resources of the substrate network. One of the known problems of network virtualization is the allocation of physical resources. An uncontrolled allocation of bandwidth might entail bottlenecked virtual networks. The main goal of this paper is to analyze the problem of bandwidth allocation among virtual networks and to show mechanisms to offer a fair bandwidth distribution.

  • A new auto-provisioned squat-based traffic management strategy for multiclass networks

     Hesselbach Serra, Xavier; Garcia Espinosa, Antonio
    EuroNF Workshop on Traffic Management and Traffic Engineering for the Future Internet
    p. 41-42
    Presentation's date: 2009-12-08
    Presentation of work at congresses

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    Routing with prioritization based on statistics in OBS networks  Open access

     Escolar Díaz, Mariana; Hesselbach Serra, Xavier
    International Conference on Transparent Optical Networks
    p. 1-4
    Presentation of work at congresses

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    This paper introduces a new strategy to provide QoS in IP/OBS networks, using Routing with Prioritization Based on Statistics (RPBS). This proposal uses the feedback scheme in optical networks to provide statistical knowledge with the objective of finding a suitable route for reach each destination from a specific source node, with more chance of success. This yields a twofold outcome. First, the losses can be reduced due to the statistics. Second, the delays are also reduced compare with other methods based on feedback scheme. These two improvements allow better QoS provision, supporting class differentiation and more efficient resources utilization. The benefits of this proposal are compared against existent alternatives by simulation. Keywords: OBS, Statistical Routing, WDM, QoS Provision, JET, RPBS

  • EURO-NF: Anticipating the Network of the Future - From Theory to Design (European Union 16366, FP7-ICT-2007-1)

     Remondo Bueno, David; Sallent Ribes, Sebastia; Hesselbach Serra, Xavier; Cervelló Pastor, Cristina; Rincon Rivera, David; Agusti Torra, Anna; Gutierrez Gonzalez, Luis Maria; Barba Marti, Antonio; Domingo Aladren, Maria Del Carmen
    Competitive project

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  • TSI2007-66637-C02. Estudio, definicion y provision de servicios basada en sip-cmi aplicada a redes reconfigurables en instalaciones de ambito metropolitano

     Alcober Segura, Jesus Angel; Chaparro Valero, Pedro Alonso; Remondo Bueno, David; Mataix Oltra, Jorge; Gorricho Moreno, Juan Luis; Oller Arcas, Antonio; Hesselbach Serra, Xavier; Miguelez Ortiz, Xavier; Domingo Aladren, Maria Del Carmen
    Competitive project

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  • Multiqueue model approach to evaluate the performance of an EPON access network

     Gutierrez Gonzalez, Luis Maria; Sallent Ribes, Sebastia; de Andrade Jardin, Marilet; Hesselbach Serra, Xavier
    15th International Conference on Telecommunications
    p. 1-6
    Presentation of work at congresses

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  • Herramienta de análisis para el diseño y dimensionado de redes IP/MPLS mediante software de emulación de red.

     Hesselbach Serra, Xavier
    Jornadas de Ingeniería Telemática1
    Presentation's date: 2008-09-16
    Presentation of work at congresses

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  • Strategy for IP traffic support with QoS in OBS networks

     Hesselbach Serra, Xavier
    International Conference on Transparent Optical Networks 2008
    Presentation's date: 2008-06-24
    Presentation of work at congresses

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