Now showing items 1-20 of 30

  • 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 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 ...
  • 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 ...
  • 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 ...
  • Contribución a la gestión dinámica de recursos aplicada al control de fuentes de vídeo de velocidad variable en la red digital de servicios integrados de banda ancha 

    Mata Diaz, Jorge (Universitat Politècnica de Catalunya, 1996-11-19)
    Doctoral thesis
    Open Access
    En esta tesis se trata el problema de integración de servicios en redes ATM. En particular, el trabajo se centra en los servicios que incorporan información de vídeo digital.<br/>La tesis se compone en cinco capítulos. El ...
  • 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 ...
  • 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 ...
  • Immunity of power line communications (PLC) in disturbed networks 

    Vallbe, Bernat; Balcells Sendra, Josep; Bogónez Franco, Francisco; Mata Diaz, Jorge; Gago Barrio, Javier (2011)
    Conference report
    Open Access
    This paper presents an analysis of electromagnetic immunity of energy metering devices, using broadband power line communications (PLC) in low voltage (LV) supply networks with high levels of disturbance. Several tests ...
  • Impacto de las unidades a pie de carretera en las interferencias en redes vehiculares 

    Hernández Gañán, Carlos; Reñé Vicente, Sergi; Mata Diaz, Jorge; Alins Delgado, Juan José (2013)
    Conference report
    Restricted access - publisher's policy
    Las redes ad hoc vehiculares (VANETs) han emergido como una tecnolog´ıa clave que posibilita el despliegue diversas aplicaciones. Proporcionar seguridad a los servicios de informaci´on y entretenimiento en estos entornos ...
  • Impact of the revocation service in PKI prices 

    Hernández Gañán, Carlos; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Mata Diaz, Jorge; Alins Delgado, Juan José (2012)
    Conference report
    Restricted access - publisher's policy
    The ability to communicate securely is needed for many network applications. Public key infrastructure (PKI) is the most extended solution to verify and confirm the identity of each party involved in any secure transaction ...
  • Implementacion de Ipsec en una arquitectura TCP splitting 

    Caubet Fernández, Juan; Muñoz Tapia, José Luis; Alins Delgado, Juan José; Mata Diaz, Jorge; Esparza Martín, Óscar (2010)
    Conference report
    Open Access
    El rendimiento de las aplicaciones que utilizan el protocolo de transporte TCP (Transmission Control Protocol) sobre enlaces vía satélite tiene una degradación significativa. Esto se debe principalmente a que el algoritmo ...
  • MHT-based mechanism for certificate revocation in VANETs 

    Muñoz Tapia, José Luis; Esparza Martín, Óscar; Hernández Gañán, Carlos; Mata Diaz, Jorge; Alins Delgado, Juan José; Ganchev, Ivan (Springer, 2014-07)
    Part of book or chapter of book
    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 utilized to provide these functionalities ...
  • NeuroCast: adaptive multi-source P2P video streaming application for wireless networks 

    Gañan, Carlos; Caubet Fernández, Juan; Mata Diaz, Jorge; Alins Delgado, Juan José; Esparza Martín, Óscar (2011)
    Conference report
    Restricted access - publisher's policy
    Streaming consists in distributing media to large audiences over a computer network. Providing a streaming service for wireless mobile nodes presents many challenges. A peer-to-peer (P2P) solution has the big advantage of ...
  • On the self-similarity nature of the revocation data 

    Gañán, Carlos; Mata Diaz, Jorge; Muñoz Tapia, José Luis; Esparza Martín, Óscar; Alins Delgado, Juan José (Springer, 2012)
    Conference report
    Restricted access - publisher's policy
    One of the hardest tasks of a Public Key Infrastructure (PKI) is to manage revocation. Different revocation mechanisms have been proposed to invalidate the credentials of compromised or misbe- having users. All these ...
  • Performance evaluation of selected transmission control protocol variants over a digital video broadcasting-second generation broadband satellite multimedia system with QoS 

    Rendón Morales, Elizabeth; Mata Diaz, Jorge; Alins Delgado, Juan José; Muñoz Tapia, José Luis; Esparza Martín, Óscar (2013-11-07)
    Article
    Restricted access - publisher's policy
    This paper presents an analysis of several Transmission Control Protocol (TCP) variants working over a digital video broadcasting-second generation (DVB-S2) satellite link with the support of the Differentiated Services ...