Now showing items 1-20 of 62

    • A Cross-layer architecture for DVB-S2 Broadband Satellite systems with QoS support 

      Rendón Morales, Elizabeth; Mata Diaz, Jorge; Muñoz Tapia, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      In this paper we propose an architecture to provide Quality of Service (QoS) guarantees for DVB-S2 broadband satellite systems. The proposed architecture provides low complexity on its implementation and can seamlessly ...
    • A game theoretic trust model for on-line distributed evolution of cooperation in MANETs 

      Mejía Fajardo, Marcela; Peña Traslaviña, Néstor; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Alzate Monroy, Marco (2011-01-13)
      Article
      Restricted access - publisher's policy
      Cooperation among nodes is fundamental for the operation of mobile ad hoc networks(MANETs). In such networks, there could be selfish nodes that use resources from other nodes to send their packets but that do not offer ...
    • A model for revocation forecasting in public-key infrastructures 

      Hernández Gañan, Carlos; Mata Diaz, Jorge; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Alins Delgado, Juan José (2015-05-01)
      Article
      Open Access
      One of the hardest tasks of a certification infrastructure is to manage revocation. This process consists in collecting and making the revocation status of certificates available to users. Research on this topic has focused ...
    • A modeling of certificate revocation and its application to synthesis of revocation traces 

      Hernández Gañán, Carlos; Mata Diaz, Jorge; Muñoz Tapia, José Luis; Hernández Serrano, Juan; Esparza Martín, Óscar; Alins Delgado, Juan José (2012)
      Article
      Restricted access - publisher's policy
      One of the hardest tasks of a public key infrastructure (PKI) is to manage revocation. New communication paradigms push the revocation system to the limit and an accurate resource assessment is necessary before implementing ...
    • A review of trust modeling in ad hoc networks 

      Mejia, M; Peña, N; Muñoz Tapia, José Luis; Esparza Martín, Óscar (2009-01)
      Article
      Restricted access - publisher's policy
      Findings The study identifies the main components that a trust model must provide, and compares the way they are implemented. It finds that the lack of unity in the different proposed approaches makes it difficult to ...
    • A simple closed-form approximation for the packet loss rate of a TCP connection over wireless links 

      Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (2014-09-15)
      Article
      Open Access
      This letter presents a new and simple model for a TCP flow experiencing random packet losses due to both transmission errors and congestion events. From this model, we will derive a straightforward expression of a unified ...
    • Adaptive IP scheduler design to support QoS guarantees over satellite systems 

      Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (2012-06)
      Article
      Open Access
      This paper presents an adaptive algorithm for man-aging the weight values of the Weighted Round Robin (WRR)scheduler to provide End-to-End (E2E) Quality of Service (QoS)guarantees for Broadband satellite ...
    • Adaptive packet scheduling for the support of QoS over DVB-S2 satellite systems 

      Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (Springer Verlag, 2011)
      Conference report
      Restricted access - publisher's policy
      This paper presents an adaptive algorithm for managing the weights of a weighted round robin (WRR) scheduler. The weights calculation depends on the capacity variations present in a Digital Video Broadcasting-Second ...
    • An architecture for easy onboarding and key life-cycle management in blockchain applications 

      Genés Durán, Rafael; Yarlequé Ruesta, Diana; Bellés Muñoz, Marta; Jimenez Viguer, Antonio; Muñoz Tapia, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2020-06-22)
      Article
      Open Access
      New manufacturing paradigms require a large number of business interactions between multiple cyber-physical systems with different owners. In this context, public distributed ledgers are disruptive because they make it ...
    • An infrastructure for detecting and punishing malicious hosts using mobile agent watermarking 

      Esparza Martín, Óscar; Muñoz Tapia, José Luis; Tomás Buliart, Joan; Soriano Ibáñez, Miguel (2010-04-02)
      Article
      Open Access
      Mobile agents are software entities consisting of code, data, and state that can migrate autonomously from host to host executing their code. In such scenario there are some security issues that must be considered. In ...
    • Analysis of TCP variants over a QoS DVB-S2 system 

      Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (ACM Press. Association for Computing Machinery, 2011)
      Conference report
      Restricted access - publisher's policy
      This paper presents a performance analysis of the TCP protocol considering the DiffServ architecture to provide Quality of Service guarantees working over a Digital Video Broadcasting - Second Generation (DVB-S2) satellite ...
    • Analysis of video streaming performance in vehicular networks 

      Reñé, Sergi; Gañan, Carlos; Caubet Fernández, Juan; Alins Delgado, Juan José; Mata Diaz, Jorge; Muñoz Tapia, José Luis (2011)
      Conference report
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      Vehicular Ad-hoc Networks (VANETs) have been mainly motivated for safety applications, but non-safety applications can also be very helpful to impulse vehicular networks. Among non-safety applications, video streaming ...
    • ARQUITECTURA DE XARXES DE COMUNICACIO (Examen 2n Quadr.) 

      Muñoz Tapia, José Luis (Universitat Politècnica de Catalunya, 2009-04-14)
      Exam
      Restricted access to the UPC academic community
    • ARQUITECTURA DE XARXES DE COMUNICACIÓ (1r quadrimestre, 1r parcial) 

      Muñoz Tapia, José Luis (Universitat Politècnica de Catalunya, 2010-11-03)
      Exam
      Restricted access to the UPC academic community
    • ARQUITECTURA DE XARXES DE COMUNICACIÓ [AXC] (2n quadrimestre, control parcial) 

      Muñoz Tapia, José Luis (Universitat Politècnica de Catalunya, 2010-04-14)
      Exam
      Restricted access to the UPC academic community
    • Certificate revocation system implementation based on the Merkle Hash Tree 

      Muñoz Tapia, José Luis; Forné Muñoz, Jorge; Esparza Martín, Óscar; Soriano Ibáñez, Miguel (2004-01)
      Article
      Restricted access - publisher's policy
      Public-key cryptography is widely used to provide Internet security services. The public-key infrastructure (PKI) is the infrastructure that supports the public-key cryptography, and the revocation of certificates implies ...
    • CERVANTES - A certificate validation test-bed 

      Muñoz Tapia, José Luis; Forné Muñoz, Jorge; Esparza Martín, Óscar; Soriano Ibáñez, Miguel (Springer Berlin / Heidelberg, 2004)
      Conference report
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      Certificate validation is one of the toughest scalability problems of the PKI. The goal of this paper is to introduce a Java platform for certificate revocation called CERVANTES. CERVANTES pretends to be an easy to extend ...
    • COACH: COllaborative certificate stAtus CHecking mechanism for VANETs 

      Hernández Gañán, Carlos; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Mata Diaz, Jorge; Hernández Serrano, Juan; Alins Delgado, Juan José (2011-11-01)
      Article
      Restricted access - publisher's policy
      Vehicular Ad Hoc Networks (VANETs) require mechanisms to authenticate messages, identify valid vehicles, and remove misbehaving vehicles. A public key infrastructure (PKI) can be used to provide these functionalities using ...
    • Cross-layer packet scheduler for QoS support over digital video broadcasting-second generation broadband satellite systems 

      Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (2014-10-01)
      Article
      Restricted access - publisher's policy
      This article presents a cross-layer packet scheduler to provide end-to-end QoS guarantees for Digital Video Broadcasting-Second Generation (DVB-S2) broadband satellite systems. The scheduler design is based on a cross-layer ...
    • DECADE: Distributed Emergent Cooperation through ADaptive Evolution in mobile ad hoc networks 

      Mejía Fajardo, Marcela; Peña Traslaviña, Néstor; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Alzate Monroy, Marco (Elsevier, 2012-09)
      Article
      Restricted access - publisher's policy
      The scarce resources of a mobile ad hoc network (MANET) should not be wasted attending selfish nodes (those nodes that use resources from other nodes to send their own packets, without offering their own resources to forward ...