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  • TEFIS: a single access point for conducting multifaceted experiments on heterogeneous test facilities

     Yannuzzi, Marcelo; Siddiqui, Muhammad Shuaib; Sällström, Annika; Pickering, B.; Serral Gracia, Rene; Martinez Manzanilla, Anny Gabriela; Chen, W.; Taylor, S.; Benbadis, F.; Leguay, J.; Borrelli, E.; Ormaetxea, I.; Campowsky, Konrad; Giammatteo, G.; Aristomenopoulos, G.; Papavassiliou, Symeon; Kuczynski, T.; Zielinski, S.; Seigneur, J.M.; Ballester Lafuente, C.; Johansson, J.; Masip Bruin, Javier; Caria, M.; Ribeiro Junior, J.R.; Salageanu, Email; Latanicki, J.
    Computer networks
    Vol. 63, p. 147-172
    DOI: 10.1016/j.bjp.2013.12.030
    Date of publication: 2014-04-22
    Journal article

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    A few years ago, an experimental facility composed of networking gear and simulation tools was sufficient for testing the main features of a prototype before the final product could be launched to the Internet market. This paradigm has certainly changed, but the lack of platforms enabling the realistic assessment of the different facets of a product, including cross-cutting trials across different testbeds, poses strong limitations for researchers and developers. In light of this, we present an open platform that offers a versatile combination of heterogeneous experimental facilities called ¿TEstbed for Future Internet Services¿ (TEFIS). TEFIS provides a single access point for conducting cutting-edge experiments on testbeds that supply different capabilities, including testbeds dedicated to network performance, software performance, grid computing, and living labs. We shall show that TEFIS covers the entire life-cycle of a multifaceted experiment, with the advantage that a single testrun can seamlessly execute across different experimental facilities. In order to demonstrate the potential and versatility of the TEFIS platform, we describe the deployment of four distinct experiments and provide a set of results highlighting the benefits of using TEFIS. The experiments described in this article cover: (i) the experimentation with an open API called OPENER (which is an open and programmable environment for managing experimentation with SDN applications); (ii) an application for skiers and tourists at the Megève ski resort in France; (iii) an application that can dynamically adapt the Quality of Experience (QoE) of multimedia services for mobile users; and (iv) an augmented reality workspace for remote education and learning purposes based on videoconferencing.

    A few years ago, an experimental facility composed of networking gear and simulation tools was sufficient for testing the main features of a prototype before the final product could be launched to the Internet market. This paradigm has certainly changed, but the lack of platforms enabling the realistic assessment of the different facets of a product, including cross-cutting trials across different testbeds, poses strong limitations for researchers and developers. In light of this, we present an open platform that offers a versatile combination of heterogeneous experimental facilities called “TEstbed for Future Internet Services” (TEFIS). TEFIS provides a single access point for conducting cutting-edge experiments on testbeds that supply different capabilities, including testbeds dedicated to network performance, software performance, grid computing, and living labs. We shall show that TEFIS covers the entire life-cycle of a multifaceted experiment, with the advantage that a single testrun can seamlessly execute across different experimental facilities. In order to demonstrate the potential and versatility of the TEFIS platform, we describe the deployment of four distinct experiments and provide a set of results highlighting the benefits of using TEFIS. The experiments described in this article cover: (i) the experimentation with an open API called OPENER (which is an open and programmable environment for managing experimentation with SDN applications); (ii) an application for skiers and tourists at the Megève ski resort in France; (iii) an application that can dynamically adapt the Quality of Experience (QoE) of multimedia services for mobile users; and (iv) an augmented reality workspace for remote education and learning purposes based on videoconferencing.

  • A survey and taxonomy of ID/Locator Split Architectures

     Ramirez Almonte, Wilson; Masip Bruin, Javier; Yannuzzi, Marcelo; Serral Gracia, Rene; Martinez Manzanilla, Anny Gabriela; Siddiqui, Muhammad Shuaib
    Computer networks
    Vol. 60, p. 13-33
    DOI: 10.1016/j.bjp.2013.12.006
    Date of publication: 2014-02-26
    Journal article

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    The IP-based addressing scheme currently supporting the whole routing architecture embeds some well-known limitations that may significantly hinder the deployment of new applications and services on the Internet. Indeed, it is widely accepted that the unstoppable growth of Internet users is producing two well-known problems: (1) depletion of addresses, motivated by a design limitation of the currently deployed addressing scheme, and (2) the semantic overload of addresses. The main negative consequences of these problems may be summarized as: (i) exacerbating the geometrical growth of the routing tables, and (ii) affecting other network features, such as traffic engineering and mobility, in terms of resilience and disruption tolerant communications.; The relevant consequences that addressing brings to the overall network operation is pushing the networking community to study and propose new addressing architectures that may limit or even remove the negative effects (affecting network performance) stemmed from the currently deployed addressing architecture. To this end, researchers working on this area must have a perfect understanding of the weaknesses and limitations coming up from the nowadays architecture as well as a comprehensive knowledge of the alternatives proposed so far along with the most appealing research trends. Aligned to this scenario, this paper comes up with the aim of assisting the reader to both: (i) get insights about the most prominent limitations of the currently deployed addressing architecture, and (ii) survey the existing proposals based on ID/Locator Split Architectures (ILSAs) including an analysis of pros and cons, as well as a taxonomy aiming at formulating a design space for evaluating and designing existing and future ILSAs. (C) 2013 Elsevier B.V. All rights reserved.

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    Multi-domain optical routing: Is there life beyond extending BGP?  Open access

     Marín Tordera, Eva; Masip Bruin, Javier; Yannuzzi, Marcelo; Serral Gracia, Rene
    Optical switching and networking
    Vol. 11, p. 119-135
    DOI: 10.1016/j.osn.2013.05.005
    Date of publication: 2014-01-01
    Journal article

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    The design of new inter-domain optical routing protocols may start from scratch, or on the contrary exploits all the research already developed in IP networks with the Border Gateway Protocol (BGP). Even though the network premises under which BGP was conceived have drastically changed, the pervasive deployment of BGP makes almost impossible its replacement, hence everything indicates that BGP-based routing will remain present in the coming years. In light of this, the approach often used for distributing reachability information and routing inter-domain connections below the IP layer has been to propose extensions to the BGP protocol, what unfortunately exports all well-known BGP weaknesses to these routing scenarios. In this paper we deeply analyze all these problems in order the reader to get a clear idea of the existing limitations inherent to the BGP, before exploring the routing problem in optical networks. Then, focusing on the optical layer we will demonstrate that current optical extensions of BGP do not meet the particular optical layer constraints. We then propose minor, though effective, changes to a path vector protocol overall offering a promising line of work and a simple solution designed to be deployed on a multi-domain and multi-layer scenario. (C) 2013 Elsevier B.V. All rights reserved.

  • Route leak identification: a step toward making inter-domain routing more reliable

     Siddiqui, Muhammad Shuaib; Montero Banegas, Diego; Yannuzzi, Marcelo; Serral Gracia, Rene; Masip Bruin, Javier
    International Conference on Design of Reliable Communications Networks
    DOI: 10.1109/DRCN.2014.6816139
    Presentation's date: 2014-03
    Presentation of work at congresses

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    Route leaks are one of the anomalies of inter-domain routing that have the capacity to produce large Internet service disruptions. Route leaks are caused because of violation of routing policies among Autonomous Systems. Unfortunately, there are not many studies that formally and thoroughly analyze the route leak problem. There exist few conventional solutions that can be used as a first line of defense, such as route filters. However, these palliatives become unfeasible in terms of scalability, mainly due to the administrative overhead and cost of maintaining the filters updated. As a result, a significant part of the Internet is defenseless against route leak attacks. In this paper, we define, describe, and examine the different types of route leaks that threaten the security and reliability of the routing system. Our main contributions can be summarized as follows. We develop a rather basic theoretical framework, which, under realistic assumptions, enables a domain to autonomously determine if a particular route advertisement received corresponds to a route leak. We reason the possible occurrence of route leaks in different scenarios, with the aim of formulating requirements for their identification, and hence thereof prevention to improve routing reliability

  • OpenLab: Extending FIRE testbeds and tools

     Serral Gracia, Rene
    Competitive project

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  • Metrics and QoE assessment in P2PTV applications

     Serral Gracia, Rene; Yannuzzi, Marcelo; Marín Tordera, Eva; Martinez Manzanilla, Anny Gabriela; Masip Bruin, Javier
    International journal of internet protocol technology
    Vol. 7, num. 3, p. 148-164
    DOI: 10.1504/IJIPT.2013.055471
    Date of publication: 2013
    Journal article

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    Peer-to-peer (P2P) is a growing technology offering an affordable platform to deploy distributed services and streaming of multimedia content through peer-to-peer television (P2PTV). Nevertheless, to promote such technology it is necessary to provide a solid streaming quality assessment mechanism. In this context, legacy solutions tied to service level agreements are no longer suitable, as for P2P systems, the service consumers become an active part by assisting in the service delivery. To overcome this limitation, we present a generic multi-layer monitoring and management framework to assess the quality of service (QoS) and the quality of experience (QoE) of multimedia traffic in any P2PTV streaming application. We also demonstrate the usefulness of our solution, by analysing the performance of a real streaming application in a P2PTV environment.

  • 17th European Conference on Networks and Optical Communications; 7th Conference on Optical Cabling and Infrastruct.

     Martinez Manzanilla, Anny Gabriela; Ramirez Almonte, Wilson; Yannuzzi, Marcelo; Serral Gracia, Rene; Marín Tordera, Eva; Sanchez Lopez, Sergio; Masip Bruin, Javier
    Competitive project

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  • EQR: a new energy-aware query-based routing protocol for wireless sensor networks

     Ahvar, Ehsan; Serral Gracia, Rene; Marín Tordera, Eva; Masip Bruin, Javier; Yannuzzi, Marcelo
    Lecture notes in computer science
    Vol. 7277, p. 102-113
    DOI: 10.1007/978-3-642-30630-3_9
    Date of publication: 2012
    Journal article

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    Over the last years, a number of query-based routing protocols have been proposed for Wireless Sensor Networks (WSNs). In this context, routing protocols can be classified into two categories, energy savers and energy balancers. In a nutshell, energy saving protocols aim at decreasing the overall energy consumed by a WSN, whereas energy balancing protocols attempt to efficiently distribute the consumption of energy throughout the network. In general terms, energy saving protocols are not necessarily good at balancing energy and vice versa. In this paper, we introduce an Energy-aware Query-based Routing protocol for WSNs (EQR), which offers a good trade-off between the traditional energy balancing and energy saving objectives. This is achieved by means of learning automata along with zonal broadcasting so as to decrease the total energy consumption. We consider that, in the near future, EQR could be positioned as the routing protocol of choice for a number of query-based WSN applications, especially for deployments where the sensors show moderate mobility.

  • Multi-Layer quality assessment framework for P2PTV applications

     Serral Gracia, Rene; Martinez Manzanilla, Anny Gabriela; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier
    IEEE International Conference on Communications
    p. 6458-6462
    DOI: 10.1109/ICC.2012.6364875
    Presentation of work at congresses

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    The success of Peer-to-Peer (P2P) overlay networks has led to its broad adoption on different scenarios, thereby increasing the set of features present on such protocols, e. g., audio and video-conferencing, streaming of multimedia content using Peer-to-Peer TeleVision (P2PTV), and so on. The wide acceptance of P2P multimedia streaming by the end-users has captured the attention of content providers, making it a suitable candidate to be adopted as technology for the offered multimedia services. Nevertheless, to deliver a proper service, content providers, need to quantify and assess the quality perceived by the users. In the past, this assessment was embedded into Service Level Agreements under the client/server paradigm, but with the introduction of P2P, these solutions became unsuitable. To overcome this limitation, we present a Monitoring and Management Framework to assess the Quality of Service and the Quality of Experience of multimedia traffic in any P2PTV streaming application.

  • TEstbed for Future Internet Services

     Masip Bruin, Javier; Marín Tordera, Eva; Serral Gracia, Rene; Yannuzzi, Marcelo
    Competitive project

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  • Modeling physical-layer impairments in multi-domain optical networks

     Yannuzzi, Marcelo; Marín Tordera, Eva; Serral Gracia, Rene; Masip Bruin, Javier; Gonzalez de Dios, Oscar; Jimenez Chico, Javier; Verchere, Dominique
    International Conference on Optical Networking Design and Modeling
    DOI: (pendiente de publicar en IEEE Xplore)
    Presentation's date: 2011-02-08
    Presentation of work at congresses

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    The advantages of optical transparency are still confined to the boundaries of a domain, since the optical signals are subject to O/E/O conversions at the border nodes that separate two optical domains. The extension of transparent connections across domains requires advances both in the modeling of the impairments suffered by the optical signals as well as in devising strategies to exploit such models in practice. In this latter regard, one of the main challenges is to design information exchange models and protocols enabling optical bypass without disclosing detailed physical-layer information among domains. In this paper, we focus on the modeling and the exchange of impairmentrelated information between optical domains. We propose a model that conveniently captures the degradation experienced by an optical signal along a lightpath, and describe it use in the frontier between two neighbor domains. Our approach respects the privacy and administrative limits of carrier networks, while enabling the provision of transparent connections beyond domain boundaries. The model and strategies proposed in this paper generalize the contributions made by some of the most relevant works in the field, providing in this way a first attempt toward a unifying view and theory for quantifying the transmission impairments in DWDM optical networks.

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    An Approach to a Fault Tolerance LISP Architecture  Open access

     Martinez Manzanilla, Anny Gabriela; Ramírez, Wilson; German Duarte, Martin; Serral Gracia, Rene; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier
    International Conference on Wired/Wireless Internet Communications
    Presentation's date: 2011-06
    Presentation of work at congresses

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    Next Generation Internet points out the challenge of addressing "things" on both a network with (wired) and without (wireless) infrastructure. In this scenario, new efficient and scalable addressing and routing schemes must be sought, since currently proposed solutions can hardly manage current scalability issues on the current global Internet routing table due to for example multihoming practices. One of the most relevant proposals for an addressing scheme is the Locator Identifier Separation Protocol (LISP) that focuses its key advantage on the fact that it does not follow a disruptive approach. Nevertheless, LISP has some drawbacks especially in terms of reachability in the border routers. In face of this, in this paper we propose a protocol so-called LISP Redundancy Protocol (LRP), which provides an interesting approach for managing the reachability and reliability issues common on a LISP architecture, such as those motivated by an inter-domain link failure.

  • DISEÑO MULTINIVEL DE NUEVAS ARQ.Y PROTOCOLOS PARA REDES MULTIDOMINIO

     Serral Gracia, Rene; Yannuzzi, Marcelo; Sanchez Lopez, Sergio; German Duarte, Martin; Ramirez Almonte, Wilson; Martinez Manzanilla, Anny Gabriela; Marín Tordera, Eva; Masip Bruin, Javier
    Competitive project

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  • Diseno Multinivel de Nuevas Arquitecturas y Protocolos para Redes Multidominio - CICYT

     Masip Bruin, Javier; Yannuzzi, Marcelo; Serral Gracia, Rene; Sanchez Lopez, Sergio; Marín Tordera, Eva; Castro Casales, Alberto; German Duarte, Martin
    Competitive project

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  • PREPARACIÓ PROPOSTA X-AGON AL FP7

     Marín Tordera, Eva; Serral Gracia, Rene; Yannuzzi, Marcelo; Masip Bruin, Javier
    Competitive project

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  • TEC2010-09498-E (WWIC 2011)

     Yannuzzi, Marcelo; Martinez Manzanilla, Anny Gabriela; Serral Gracia, Rene; Marín Tordera, Eva; Sanchez Lopez, Sergio; Ramirez Almonte, Wilson; Masip Bruin, Javier
    Competitive project

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  • FP7-258300-ONE

     Serral Gracia, Rene; Masip Bruin, Javier; Martinez Manzanilla, Anny Gabriela; Marín Tordera, Eva; Ramirez Almonte, Wilson; Yannuzzi, Marcelo
    Competitive project

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  • ONE:PREPARCIÓN PROPUESTA AL FP7

     Masip Bruin, Javier; Serral Gracia, Rene; Marín Tordera, Eva; Yannuzzi, Marcelo
    Competitive project

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  • PREPARACIÓ PROPOSTA OASIS AL FP7

     Serral Gracia, Rene; Yannuzzi, Marcelo; Marín Tordera, Eva; Masip Bruin, Javier
    Competitive project

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  • PREPARACIÓ PROPOSTA HAROON AL FP7

     Yannuzzi, Marcelo; Serral Gracia, Rene; Marín Tordera, Eva; Masip Bruin, Javier
    Competitive project

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  • PREPARACIÓ PROPOSTA X-TALK AL FP7

     Marín Tordera, Eva; Serral Gracia, Rene; Yannuzzi, Marcelo; Masip Bruin, Javier
    Competitive project

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  • An efficient and lightweight method for Service Level Agreement assessment

     Serral Gracia, Rene; Yannuzzi, Marcelo; Labit, Yann; Owezarski, Philippe; Masip Bruin, Javier
    Computer networks
    Vol. 54, num. 17, p. 3144-3158
    DOI: 10.1016/j.comnet.2010.06.005
    Date of publication: 2010-12-03
    Journal article

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    Quality of experience enforcement in wireless networks  Open access

     Serral Gracia, Rene; Yannuzzi, Marcelo; Marín Tordera, Eva; Masip Bruin, Javier; Sanchez Lopez, Sergio
    International Conference on Wired/Wireless Internet Communications
    p. 180-191
    DOI: 10.1007/978-3-642-13315-2_15
    Presentation's date: 2010-06-03
    Presentation of work at congresses

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    In this paper we present a Multimedia Wireless Management System, which can be used on-line to assess and guarantee the quality of multimedia traffic in a wireless network. The proposed platform uses both network and application layer metrics to build up a scalable quality assessment of multimedia traffic. Moreover, the system provides traffic provisioning capabilities by coordinating the network access and usage both from the wireless node and from the network access point. These two combined features permit our platform to guarantee a satisfactory multimedia user experience in wireless environments. We evaluate our proposal by issuing an experimental deployment in a testbed and performing a series of tests under different network situations to demonstrate the Quality of Experience guaranties of our system. The results show that the quality of video perceived by end-users is considerably improved compared to the typical wireless network.

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    Reducing the effects of routing inaccuracy by means of prediction and an innovative link-state cost  Open access

     Masip Bruin, Javier; Marín Tordera, Eva; Yannuzzi, Marcelo; Serral Gracia, Rene; Sanchez Lopez, Sergio
    IEEE communications letters
    Vol. 14, num. 5
    Date of publication: 2010-05
    Journal article

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    The routing inaccuracy problem is one of the major issues impeding the evolution and deployment of Constraint- Based Routing (CBR) techniques. This paper proposes a promising CBR strategy that combines the strengths of prediction with an innovative link-state cost. The latter explicitly integrates a two-bit counter predictor, with a novel metric that stands for the degree of inaccuracy (seen by the source node) of the state information associated with the links along a path. In our routing model, Link-State Advertisements (LSAs) are only distributed upon topological changes in the network, i.e., the state and availability of network resources along a path are predicted from the source rather than updated through conventional LSAs. As a proof-of-concept, we apply our routing strategy in the context of circuit-switched networks. We show that our approach considerably reduces the impact of routing inaccuracy on the blocking probability, while eliminating the typical LSAs caused by the traffic dynamics in CBR protocols.

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    An overview of quality of experience measurement challenges for video applications in IP Networks  Open access

     Serral Gracia, Rene; Cerqueira, E; Curado, Marilia; Yannuzzi, Marcelo; Monteiro, Edmundo; Masip Bruin, Javier
    International Conference on Wired/Wireless Internet Communications
    p. 252-263
    DOI: 10.1007/978-3-642-13315-2
    Presentation's date: 2010-06-04
    Presentation of work at congresses

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    The increase in multimedia content on the Internet has created a renewed interest in quality assessment. There is however a main difference from the traditional quality assessment approaches, as now, the focus relies on the user perceived quality, opposed to the network centered approach classically proposed. In this paper we overview the most relevant challenges to perform Quality of Experience (QoE) assessment in IP networks and highlight the particular considerations necessary when compared to alternative mechanisms, already deployed, such as Quality of Service (QoS). To assist on the handling of such challenges we first discuss the different approaches to Quality of Experience assessment along with the most relevant QoE metrics, and then we discuss how they are used to provide objective results about user satisfaction.

    Postprint (author’s final draft)

  • Effcient network performance assessment using Inter-Packet Arrival Times

     Serral Gracia, Rene; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier; Sanchez Lopez, Sergio
    IEEE Global Communications Conference
    p. 1627-1631
    DOI: 10.1109/GLOCOMW.2010.5700215
    Presentation's date: 2010-12-06
    Presentation of work at congresses

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    Cross-layer multimedia quality enforcement through user aware information in wireless networks  Open access

     Serral Gracia, Rene; Yannuzzi, Marcelo; Marín Tordera, Eva; Masip Bruin, Javier; Sanchez Lopez, Sergio
    Workshop on Multilayer Netwoks
    p. 17-22
    Presentation's date: 2010-06-14
    Presentation of work at congresses

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    Quality assessment of multimedia traffic is a hot topic. In this paper we present a Multimedia Management System, which can be used on-line to assess and guarantee the quality of multimedia traffic in a wired and wireless network. The proposed platform uses both network and application layer metrics to build up a scalable quality assessment framework. The core of this framework provides means for traffic provisioning capabilities by coordinating the network access and usage both from the wireless node and from the network access point. These two combined features permit our platform to guarantee a satisfactory multimedia user experience. We evaluate our proposal by issuing an experimental deployment in a testbed and performing a series of tests under different network situations to demonstrate the Quality of Experience guaranties of our system. The results show that the quality of video perceived by endusers is considerably improved compared to the typical wireless network.

    Postprint (author’s final draft)

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    A New Parametric Regenerator Allocation Scheme taking into account Inaccurate Physical Information  Open access

     Marín Tordera, Eva; Yannuzzi, Marcelo; Serral Gracia, Rene; Masip Bruin, Javier; Sanchez Lopez, Sergio
    15th European Conference on Networks and Optical Communications 5th Conference on Optical Cabling and Infrastructure
    p. 175-180
    Presentation's date: 2010-06-08
    Presentation of work at congresses

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    Regenerator allocation consists on selecting which of the already installed regenerators in a translucent network may be used according to the dynamic traffic requests in order to maximize the quality of the optical signal while minimizing the opaqueness of the network. A recent study has shown that the performance of the regenerator allocation techniques strongly depends on the accuracy of the physical-layer information. The reason of this physical inaccuracy is the drift suffered by the physical-layer parameters during the operation of the optical network. In these conditions, the performance of the Impairment Aware-Routing and Wavelength Assignment (IA-RWA) process might drop sharply when allocating regenerators inappropriately. In this paper, we propose new regenerator allocation schemes taking into account the inherent and unavoidable inaccuracy in the physical-layer information

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    Cross-talk effects on the Regenerator Allocation optimization  Open access

     Marín Tordera, Eva; Masip Bruin, Javier; Yannuzzi, Marcelo; Serral Gracia, Rene; Sanchez Lopez, Sergio
    International Congress on Ultra Modern Telecommunications and Control Systems and Workshops
    p. 1206-1211
    Presentation's date: 2010-10-19
    Presentation of work at congresses

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    This paper studies the impact of considering crosstalk effects in the IA-RWA process and in the regenerator allocation algorithms. First of all, we evaluate if the regenerator allocation optimization is still useful when the crosstalk effects are considered. For this end we improve a simple physical model which computes the quality of the signal factor for each optical connection. Until now this physical model was unaware of the physical layer impairments depending on the interference between different optical connections, such as the crosstalk. Following the same simple methodology we add the switching node crosstalk effect to the computation of the quality of the signal factor. Once the new physical model is enhanced we evaluate the impact of the crosstalk on the performance of IA-RWA algorithms that optimize the use of the regenerators; and also we evaluate the impact of different e wavelength assignation techniques.

  • Quality of experience aware multimedia provisioning with cross-layer network management

     Serral Gracia, Rene; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier; Sanchez Lopez, Sergio
    IEEE Global Communications Conference
    p. 1-5
    DOI: 10.1109/GLOCOM.2010.5684315
    Presentation's date: 2010-12-07
    Presentation of work at congresses

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    Simple network management provisioning based on quality of experience feedback  Open access

     Serral Gracia, Rene; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier; Sanchez Lopez, Sergio
    Workshop in G/MPLS Networks
    p. 1-11
    Presentation's date: 2010-07-06
    Presentation of work at congresses

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    This paper presents a promising Autonomic Network Management System (ANMS) that allows Service Providers (SPs) to perform efficient network resource provisioning with their Network Operators (NOs). The novelty of our ANMS is that it offers an starting point to use the end-users perceived quality as a metric to manage the network resources. We show that our system is capable of achieving considerable reductions in the operational costs of SPs, while keeping proper bounds in the end-user satisfaction for the offered multimedia services.

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    Regenerator allocation in WDM networks with uncertainities in the Q factor  Open access

     Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier; Serral Gracia, Rene; Sanchez Lopez, Sergio
    Workshop on Multilayer Networks
    p. 31-34
    Presentation's date: 2010-06-15
    Presentation of work at congresses

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    The performance of the regenerator allocation algorithms in WDM networks strongly depends on the accuracy of the physical-layer information such as the Q factor. In a translucent WDM network the already installed regenerators along the lightpath are allocated based on the physical information (Q factor) in order to maximize the quality of the optical signal while minimizing the opaqueness of the network. The Q factor used by the IA-RWA algorithms is usually inaccurate due to the drift suffered by the physical-layer parameters during the operation of the optical network. In this scenario the allocation of regenerators is not optimized and then the performance of the network is worsened. New regenerator allocation schemes should be proposed in order of counteracting the inherent and unpredictable uncertainty in the physical-layer information.

  • Towards End-to-End SLA Assessment.

     Serral Gracia, Rene
    Department of Computer Architecture, Universitat Politècnica de Catalunya
    Theses

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  • COST ACTION IC0806

     Yannuzzi, Marcelo; Serral Gracia, Rene; Ramirez Almonte, Wilson; Martinez Manzanilla, Anny Gabriela; Marín Tordera, Eva; Masip Bruin, Javier
    Competitive project

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  • Intelligent Monitoring Control and Security of Critical Infrastructure Systems

     Masip Bruin, Javier; Yannuzzi, Marcelo; Serral Gracia, Rene
    Competitive project

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  • Proposta X-TALK Call 5 ICT

     Serral Gracia, Rene; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier
    Competitive project

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  • Path-State Vectors - Cisco

     Serral Gracia, Rene; Yannuzzi, Marcelo; Masip Bruin, Javier
    Competitive project

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  • XARXA MULTINIVELL : IP SOBRE XARXA DE TRANSPORTS (TEC2008-02552-E/TEC)

     Sanchez Lopez, Sergio; Serral Gracia, Rene; German Duarte, Martin; Castro Casales, Alberto; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier
    Competitive project

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    The Minimum Coincidence Routing Approach in Wavelength-Routed Optical WDM Networks  Open access

     Masip Bruin, Javier; German Duarte, Martin; Castro Casales, Alberto; Marín Tordera, Eva; Serral Gracia, Rene; Sanchez Lopez, Sergio; Yannuzzi, Marcelo; Gagliano Molla, Roque; Grampin Castro, Eduardo
    IEEE/IFIP Latin American Network Operations and Management Symposium
    Presentation's date: 2009-10
    Presentation of work at congresses

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    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, shortest path based approaches are often applied to compute paths. Although such approaches offer advantages in terms of network loading, they are restricted by the fact, that routes are selected without taking into account parameters pertaining to any explicit and desired service guarantees. Thus, the wavelength assignment process may assign a non-optimal wavelength with respect to incoming traffic requirements and any associated quality of service specifications. This paper addresses the lightpath selection problem by proposing a novel route selection scheme where routes are determined based upon the twin criteria of minimizing the number of hops and balancing the network load, resulting in a reduction in both network congestion and blocking probability.

  • Towards an efficient Service Level Agreement assessment

     Serral Gracia, Rene; Labit, Yann; Domingo Pascual, Jordi; Owezarski, Philippe
    IEEE Conference on Computer Communications
    p. 2581-2585
    DOI: 10.1109/INFCOM.2009.5062191
    Presentation's date: 2009-04
    Presentation of work at congresses

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    Quality of experience based provisioning for service providers  Open access

     Serral Gracia, Rene; Marín Tordera, Eva; Yannuzzi, Marcelo; Masip Bruin, Javier; Sanchez Lopez, Sergio
    Workshop on Multilayer Networks
    Presentation's date: 2009-12-15
    Presentation of work at congresses

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    Nowadays Network Operators (NOs) are providing service guaranties to customers by largely overprovisioning their networks, but as the Internet keeps growing, this approach is unveiling important issues in terms of cost and management of the network. To optimize the resource usage, and to reduce the existing overprovisioning, in this paper we present a Cross-layer Autonomic Network Management System that permits Service Providers to perform cost-effective network resource reservation with their NOs. In our novel approach, we use the end-user satisfaction level as the metric used to perform the resource provisioning. We show that our system is capable of achieving a high reduction in operational costs for the Service Providers, while keeping proper bounds in the end-user satisfaction for the offered services.

    Postprint (author’s final draft)

  • Coping with Distributed Monitoring of QoS-enabled Heterogeneous Networks

     Serral Gracia, Rene
    4th International Telecommunication Networking Workshop on QoS in Mutiservice IP Networks
    Presentation's date: 2008-02-13
    Presentation of work at congresses

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  • QoS Measurements in IP-based Networks

     Serral Gracia, Rene; Domingo Pascual, Jordi; Andrzej, Beben; Owezarski, Philippe
    Date of publication: 2008-01
    Book chapter

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    Maximum Coverage at Minimum Cost for Multi-Domain IP/MPLS Networks  Open access

     Yannuzzi, Marcelo; Masip Bruin, Javier; Serral Gracia, Rene; Marín Tordera, Eva; Sprintson, Alex; Orda, Ariel
    IEEE INFOCOM 2008, The 27th Conference on Computer Communications
    Presentation's date: 2008-04-14
    Presentation of work at congresses

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    At present, service providers have several incentives to extend the reach of long-lived MPLS paths across domains. Providers, however, will face a number of trade-offs while choosing the optimal set of MPLS paths to be established. In this paper, we focus on the multi-objective decision problem of maximizing the traffic demands to be covered by long-lived MPLS paths from a source domain S to its major destination domains, while minimizing the monetary costs incurred. The problem is formulated subject to a budget constraint, which assures the minimum expected revenue for the provider in S. A major advantage of the analysis and solution proposed in this paper is that it can be easily generalized, and applied in other settings where constrained problems considering maximum coverage vs. cost are critical.

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    Distributed sampling for on-line SLA assessment  Open access

     Serral Gracia, Rene; Barlet Ros, Pere; Domingo Pascual, Jordi
    IEEE Workshop on Local and Metropolitan Area Networks
    Presentation's date: 2008-09-03
    Presentation of work at congresses

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    New business infrastructures over the Internet pose a new set of traffic constraints. In particular, multimedia and interactive contents require guarantees of bandwidth and delivery time. The broad deployment and real-time nature of this class of applications require the provisioning of specific resources in the network to guarantee a certain level of Quality of Service (QoS). QoS techniques need ways of obtaining feedback about the status of the QoS enabled paths, for example, for checking the fulfilment of Service Level Agreements (SLA). A possible technique for obtaining such feedback is by passively monitoring the network traffic. The issue with traffic monitoring is the additional bandwidth needed by the control traffic generated by the different collection points in order to synchronise its acquired QoS metrics. Moreover, passive monitoring at line speed is an expensive process both in terms of resource consumption and price. However, some of these requirements can be significantly reduced by using traffic sampling. This paper presents a novel methodology for intra-domain on-line distributed QoS monitoring, which makes an efficient use of the network resources by employing distributed sampling mechanisms. The proposal is validated by performing real tests on an European-wide testbed. Our results show that the sampling technique can significantly reduce the traffic overhead, while obtaining very accurate estimations of the One Way Delay performance metric

  • Coverage vs. Cost for PCE-based MPLS Multi-Domain Networks

     Yannuzzi, Marcelo; Masip Bruin, Javier; Serral Gracia, Rene; Marín Tordera, Eva; Sprintson, A; Orda, and A
    Date: 2008-01
    Report

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  • Parameter evaluation for distributed SLA assessment

     Serral Gracia, Rene; Labit, Yann; Domingo Pascual, Jordi; Owezarski, Philippe
    Date: 2008-08
    Report

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  • Plataforma para la monitorización distribuida de calidad de servicio

     Serral Gracia, Rene; Domingo Pascual, Jordi
    Iris (Madrid)
    Vol. 1, num. 82-83, p. 130-134
    Date of publication: 2008-04
    Journal article

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  • Coping with Distributed Monitoring of QoS-enabled Heterogeneous Networks

     Serral Gracia, Rene; Barlet Ros, Pere; Domingo Pascual, Jordi
    4th International Telecommunication Networking Workshop on QoS in Mutiservice IP Networks
    p. 142-147
    Presentation's date: 2008-02-13
    Presentation of work at congresses

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  • Wan Emulator

     Rus, Andrei Bogdan; Serral Gracia, Rene; Domingo Pascual, Jordi; Dobrota, Virgil
    7th International Conference Communications 2008
    p. 225-228
    Presentation's date: 2008-06-05
    Presentation of work at congresses

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