Now showing items 1-20 of 54

  • 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 ...
  • 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 ...
  • 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 ...
  • 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
    Restricted access - publisher's policy
    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 ...
  • 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 ...
  • 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
  • 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
  • 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
    Restricted access - publisher's policy
    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 ...
  • 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
    Restricted access - publisher's policy
    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 ...
  • Desing and Evaluation of Certificate Revocation Systems 

    Muñoz Tapia, José Luis (Universitat Politècnica de Catalunya, 2003-11-26)
    Doctoral thesis
    Open Access
    Este trabajo presenta tanto el estado del arte como un análisis de los principales sistemas de revocación de certificados digitales. El hecho de comprender bien el mecanismo de revocación de un certificado es importante ...
  • EPA: An efficient and privacy-aware revocation mechanism for vehicular ad hoc networks 

    Hernández Gañan, Carlos; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Mata Diaz, Jorge; Alins Delgado, Juan José (Elsevier, 2015-08-01)
    Article
    Open Access
    Security is vital for the reliable operation of vehicular ad hoc networks (VANETs). One of the critical security issues is the revocation of misbehaving vehicles. While essential, revocation checking can leak private ...
  • Evaluation of cryptographic capabilities for the Android platform 

    Gonzalez Peon, David; Esparza Martín, Óscar; Muñoz Tapia, José Luis; Alins Delgado, Juan José; Mata Diaz, Jorge (Springer, 2015)
    Conference report
    Restricted access - publisher's policy
    Future networks will be formed by millions of devices, many of them mobile, sharing information and running applications. Android is currently the most widely used operating system in smartphones, and it is becoming more ...
  • FONAMENTS DE XARXES TELEMÀTIQUES (Exàmen 2n quadrimestre, 1r parcial) 

    Muñoz Tapia, José Luis (Universitat Politècnica de Catalunya, 2012-04-10)
    Exam
    Restricted access to the UPC academic community