2,072 research outputs found
An optimized resilient advance bandwidth scheduling for media delivery services
Part 3: Evaluation and Experimental Study of Rich Network ServicesInternational audienceIn IP-based media delivery services, we often deal with predictable network load and traffic, making it beneficial to use advance reservations even when network failure occurs. In such a network, to offer reliable reservations, fault-tolerance related features should be incorporated in the advance reservation system. In this paper, we propose an optimized protection mechanism in which backup paths are selected in advance to protect the transfers when any failure happens in the network. Using a shared backup path protection, the proposed approach minimizes the backup capacity of the requests while guaranteeing 100% single link failure recovery. We have evaluated the quality and complexity of our proposed solution and the impact of different percentages of backup demands and timeslot sizes have been investigated in depth. The presented approach has been compared to our previously-designed algorithm as a baseline. Our simulation results reveal a noticeable improvement in request acceptance rate, up to 9.2%. Moreover, with fine-grained timeslot sizes and under limited network capacity, the time complexity of the proposed solution is up to 14% lower
A framework for Traffic Engineering in software-defined networks with advance reservation capabilities
298 p.En esta tesis doctoral se presenta una arquitectura software para facilitar la introducciĂłn de tĂ©cnicas de ingenierĂa de tráfico en redes definidas por software. La arquitectura ha sido diseñada de forma modular, de manera que soporte mĂşltiples casos de uso, incluyendo su aplicaciĂłn en redes acadĂ©micas. Cabe destacar que las redes acadĂ©micas se caracterizan por proporcionar servicios de alta disponibilidad, por lo que la utilizaciĂłn de tĂ©cnicas de ingenierĂa de tráfico es de vital importancia a fin de garantizar la prestaciĂłn del servicio en los tĂ©rminos acordados. Uno de los servicios tĂpicamente prestados por las redes acadĂ©micas es el establecimiento de circuitos extremo a extremo con una duraciĂłn determinada en la que una serie de recursos de red estĂ©n garantizados, conocido como ancho de banda bajo demanda, el cual constituye uno de los casos de uso en ingenierĂa de tráfico más desafiantes. Como consecuencia, y dado que esta tesis doctoral ha sido co-financiada por la red acadĂ©mica GÉANT, la arquitectura incluye soporte para servicios de reserva avanzada. La soluciĂłn consiste en una gestiĂłn de los recursos de red en funciĂłn del tiempo, la cual mediante el empleo de estructuras de datos y algoritmos especĂficamente diseñados persigue la mejora de la utilizaciĂłn de los recursos de red a la hora de prestar este tipo de servicios. La soluciĂłn ha sido validada teniendo en cuenta los requisitos funcionales y de rendimiento planteados por la red GÉANT. AsĂ mismo, cabe destacar que la soluciĂłn será utilizada en el despliegue piloto del nuevo servicio de ancho de banda bajo demanda de la red GÉANT a finales del 2017
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Multimedia delivery in the future internet
The term “Networked Media” implies that all kinds of media including text, image, 3D graphics, audio
and video are produced, distributed, shared, managed and consumed on-line through various networks,
like the Internet, Fiber, WiFi, WiMAX, GPRS, 3G and so on, in a convergent manner [1]. This white
paper is the contribution of the Media Delivery Platform (MDP) cluster and aims to cover the Networked
challenges of the Networked Media in the transition to the Future of the Internet.
Internet has evolved and changed the way we work and live. End users of the Internet have been confronted
with a bewildering range of media, services and applications and of technological innovations concerning
media formats, wireless networks, terminal types and capabilities. And there is little evidence that the pace
of this innovation is slowing. Today, over one billion of users access the Internet on regular basis, more
than 100 million users have downloaded at least one (multi)media file and over 47 millions of them do so
regularly, searching in more than 160 Exabytes1 of content. In the near future these numbers are expected
to exponentially rise. It is expected that the Internet content will be increased by at least a factor of 6, rising
to more than 990 Exabytes before 2012, fuelled mainly by the users themselves. Moreover, it is envisaged
that in a near- to mid-term future, the Internet will provide the means to share and distribute (new)
multimedia content and services with superior quality and striking flexibility, in a trusted and personalized
way, improving citizens’ quality of life, working conditions, edutainment and safety.
In this evolving environment, new transport protocols, new multimedia encoding schemes, cross-layer inthe
network adaptation, machine-to-machine communication (including RFIDs), rich 3D content as well as
community networks and the use of peer-to-peer (P2P) overlays are expected to generate new models of
interaction and cooperation, and be able to support enhanced perceived quality-of-experience (PQoE) and
innovative applications “on the move”, like virtual collaboration environments, personalised services/
media, virtual sport groups, on-line gaming, edutainment. In this context, the interaction with content
combined with interactive/multimedia search capabilities across distributed repositories, opportunistic P2P
networks and the dynamic adaptation to the characteristics of diverse mobile terminals are expected to
contribute towards such a vision.
Based on work that has taken place in a number of EC co-funded projects, in Framework Program 6 (FP6)
and Framework Program 7 (FP7), a group of experts and technology visionaries have voluntarily
contributed in this white paper aiming to describe the status, the state-of-the art, the challenges and the way
ahead in the area of Content Aware media delivery platforms
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