Now showing items 1-20 of 32

    • 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 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 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 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...