18 research outputs found

    QoE on media deliveriy in 5G environments

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    231 p.5G expandir谩 las redes m贸viles con un mayor ancho de banda, menor latencia y la capacidad de proveer conectividad de forma masiva y sin fallos. Los usuarios de servicios multimedia esperan una experiencia de reproducci贸n multimedia fluida que se adapte de forma din谩mica a los intereses del usuario y a su contexto de movilidad. Sin embargo, la red, adoptando una posici贸n neutral, no ayuda a fortalecer los par谩metros que inciden en la calidad de experiencia. En consecuencia, las soluciones dise帽adas para realizar un env铆o de tr谩fico multimedia de forma din谩mica y eficiente cobran un especial inter茅s. Para mejorar la calidad de la experiencia de servicios multimedia en entornos 5G la investigaci贸n llevada a cabo en esta tesis ha dise帽ado un sistema m煤ltiple, basado en cuatro contribuciones.El primer mecanismo, SaW, crea una granja el谩stica de recursos de computaci贸n que ejecutan tareas de an谩lisis multimedia. Los resultados confirman la competitividad de este enfoque respecto a granjas de servidores. El segundo mecanismo, LAMB-DASH, elige la calidad en el reproductor multimedia con un dise帽o que requiere una baja complejidad de procesamiento. Las pruebas concluyen su habilidad para mejorar la estabilidad, consistencia y uniformidad de la calidad de experiencia entre los clientes que comparten una celda de red. El tercer mecanismo, MEC4FAIR, explota las capacidades 5G de analizar m茅tricas del env铆o de los diferentes flujos. Los resultados muestran c贸mo habilita al servicio a coordinar a los diferentes clientes en la celda para mejorar la calidad del servicio. El cuarto mecanismo, CogNet, sirve para provisionar recursos de red y configurar una topolog铆a capaz de conmutar una demanda estimada y garantizar unas cotas de calidad del servicio. En este caso, los resultados arrojan una mayor precisi贸n cuando la demanda de un servicio es mayor

    QoE on media deliveriy in 5G environments

    Get PDF
    231 p.5G expandir谩 las redes m贸viles con un mayor ancho de banda, menor latencia y la capacidad de proveer conectividad de forma masiva y sin fallos. Los usuarios de servicios multimedia esperan una experiencia de reproducci贸n multimedia fluida que se adapte de forma din谩mica a los intereses del usuario y a su contexto de movilidad. Sin embargo, la red, adoptando una posici贸n neutral, no ayuda a fortalecer los par谩metros que inciden en la calidad de experiencia. En consecuencia, las soluciones dise帽adas para realizar un env铆o de tr谩fico multimedia de forma din谩mica y eficiente cobran un especial inter茅s. Para mejorar la calidad de la experiencia de servicios multimedia en entornos 5G la investigaci贸n llevada a cabo en esta tesis ha dise帽ado un sistema m煤ltiple, basado en cuatro contribuciones.El primer mecanismo, SaW, crea una granja el谩stica de recursos de computaci贸n que ejecutan tareas de an谩lisis multimedia. Los resultados confirman la competitividad de este enfoque respecto a granjas de servidores. El segundo mecanismo, LAMB-DASH, elige la calidad en el reproductor multimedia con un dise帽o que requiere una baja complejidad de procesamiento. Las pruebas concluyen su habilidad para mejorar la estabilidad, consistencia y uniformidad de la calidad de experiencia entre los clientes que comparten una celda de red. El tercer mecanismo, MEC4FAIR, explota las capacidades 5G de analizar m茅tricas del env铆o de los diferentes flujos. Los resultados muestran c贸mo habilita al servicio a coordinar a los diferentes clientes en la celda para mejorar la calidad del servicio. El cuarto mecanismo, CogNet, sirve para provisionar recursos de red y configurar una topolog铆a capaz de conmutar una demanda estimada y garantizar unas cotas de calidad del servicio. En este caso, los resultados arrojan una mayor precisi贸n cuando la demanda de un servicio es mayor

    QoE management of HTTP adaptive streaming services

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    Cloud media video encoding:review and challenges

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    In recent years, Internet traffic patterns have been changing. Most of the traffic demand by end users is multimedia, in particular, video streaming accounts for over 53%. This demand has led to improved network infrastructures and computing architectures to meet the challenges of delivering these multimedia services while maintaining an adequate quality of experience. Focusing on the preparation and adequacy of multimedia content for broadcasting, Cloud and Edge Computing infrastructures have been and will be crucial to offer high and ultra-high definition multimedia content in live, real-time, or video-on-demand scenarios. For these reasons, this review paper presents a detailed study of research papers related to encoding and transcoding techniques in cloud computing environments. It begins by discussing the evolution of streaming and the importance of the encoding process, with a focus on the latest streaming methods and codecs. Then, it examines the role of cloud systems in multimedia environments and provides details on the cloud infrastructure for media scenarios. After doing a systematic literature review, we have been able to find 49 valid papers that meet the requirements specified in the research questions. Each paper has been analyzed and classified according to several criteria, besides to inspect their relevance. To conclude this review, we have identified and elaborated on several challenges and open research issues associated with the development of video codecs optimized for diverse factors within both cloud and edge architectures. Additionally, we have discussed emerging challenges in designing new cloud/edge architectures aimed at more efficient delivery of media traffic. This involves investigating ways to improve the overall performance, reliability, and resource utilization of architectures that support the transmission of multimedia content over both cloud and edge computing environments ensuring a good quality of experience for the final user

    Video Caching, Analytics and Delivery at the Wireless Edge: A Survey and Future Directions

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    Future wireless networks will provide high bandwidth, low-latency, and ultra-reliable Internet connectivity to meet the requirements of different applications, ranging from mobile broadband to the Internet of Things. To this aim, mobile edge caching, computing, and communication (edge-C3) have emerged to bring network resources (i.e., bandwidth, storage, and computing) closer to end users. Edge-C3 allows improving the network resource utilization as well as the quality of experience (QoE) of end users. Recently, several video-oriented mobile applications (e.g., live content sharing, gaming, and augmented reality) have leveraged edge-C3 in diverse scenarios involving video streaming in both the downlink and the uplink. Hence, a large number of recent works have studied the implications of video analysis and streaming through edge-C3. This article presents an in-depth survey on video edge-C3 challenges and state-of-the-art solutions in next-generation wireless and mobile networks. Specifically, it includes: a tutorial on video streaming in mobile networks (e.g., video encoding and adaptive bitrate streaming); an overview of mobile network architectures, enabling technologies, and applications for video edge-C3; video edge computing and analytics in uplink scenarios (e.g., architectures, analytics, and applications); and video edge caching, computing and communication methods in downlink scenarios (e.g., collaborative, popularity-based, and context-aware). A new taxonomy for video edge-C3 is proposed and the major contributions of recent studies are first highlighted and then systematically compared. Finally, several open problems and key challenges for future research are outlined

    Optimising Networks For Ultra-High Definition Video

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    The increase in real-time ultra-high definition video services is a challenging issue for current network infrastructures. The high bitrate traffic generated by ultra-high definition content reduces the effectiveness of current live video distribution systems. Transcoders and application layer multicasting (ALM) can reduce traffic in a video delivery system, but they are limited due to the static nature of their implementations. To overcome the restrictions of current static video delivery systems, an OpenFlow based migration system is proposed. This system enables an almost seamless migration of a transcoder or ALM node, while delivering real-time ultra-high definition content. Further to this, a novel heuristic algorithm is presented to optimise control of the migration events and destination. The combination of the migration system and heuristic algorithm provides an improved video delivery system, capable of migrating resources during operation with minimal disruption to clients. With the rise in popularity of consumer based live streaming, it is necessary to develop and improve architectures that can support these new types of applications. Current architectures introduce a large delay to video streams, which presents issues for certain applications. In order to overcome this, an improved infrastructure for delivering real-time streams is also presented. The proposed system uses OpenFlow within a content delivery network (CDN) architecture, in order to improve several aspects of current CDNs. Aside from the reduction in stream delay, other improvements include switch level multicasting to reduce duplicate traffic and smart load balancing for server resources. Furthermore, a novel max-flow algorithm is also presented. This algorithm aims to optimise traffic within a system such as the proposed OpenFlow CDN, with the focus on distributing traffic across the network, in order to reduce the probability of blocking

    Application of service composition mechanisms to Future Networks architectures and Smart Grids

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    Aquesta tesi gira entorn de la hip貌tesi de la metodologia i mecanismes de composici贸 de serveis i com es poden aplicar a diferents camps d'aplicaci贸 per a orquestrar de manera eficient comunicacions i processos flexibles i sensibles al context. M茅s concretament, se centra en dos camps d'aplicaci贸: la distribuci贸 eficient i sensible al context de contingut multim猫dia i els serveis d'una xarxa el猫ctrica intel路ligent. En aquest 煤ltim camp es centra en la gesti贸 de la infraestructura, cap a la definici贸 d'una Software Defined Utility (SDU), que proposa una nova manera de gestionar la Smart Grid amb un enfocament basat en programari, que permeti un funcionament molt m茅s flexible de la infraestructura de xarxa el猫ctrica. Per tant, revisa el context, els requisits i els reptes, aix铆 com els enfocaments de la composici贸 de serveis per a aquests camps. Fa especial 猫mfasi en la combinaci贸 de la composici贸 de serveis amb arquitectures Future Network (FN), presentant una proposta de FN orientada a serveis per crear comunicacions adaptades i sota demanda. Tamb茅 es presenten metodologies i mecanismes de composici贸 de serveis per operar sobre aquesta arquitectura, i posteriorment, es proposa el seu 煤s (en conjunci贸 o no amb l'arquitectura FN) en els dos camps d'estudi. Finalment, es presenta la investigaci贸 i desenvolupament realitzat en l'脿mbit de les xarxes intel路ligents, proposant diverses parts de la infraestructura SDU amb exemples d'aplicaci贸 de composici贸 de serveis per dissenyar seguretat din脿mica i flexible o l'orquestraci贸 i gesti贸 de serveis i recursos dins la infraestructura de l'empresa el猫ctrica.Esta tesis gira en torno a la hip贸tesis de la metodolog铆a y mecanismos de composici贸n de servicios y c贸mo se pueden aplicar a diferentes campos de aplicaci贸n para orquestar de manera eficiente comunicaciones y procesos flexibles y sensibles al contexto. M谩s concretamente, se centra en dos campos de aplicaci贸n: la distribuci贸n eficiente y sensible al contexto de contenido multimedia y los servicios de una red el茅ctrica inteligente. En este 煤ltimo campo se centra en la gesti贸n de la infraestructura, hacia la definici贸n de una Software Defined Utility (SDU), que propone una nueva forma de gestionar la Smart Grid con un enfoque basado en software, que permita un funcionamiento mucho m谩s flexible de la infraestructura de red el茅ctrica. Por lo tanto, revisa el contexto, los requisitos y los retos, as铆 como los enfoques de la composici贸n de servicios para estos campos. Hace especial hincapi茅 en la combinaci贸n de la composici贸n de servicios con arquitecturas Future Network (FN), presentando una propuesta de FN orientada a servicios para crear comunicaciones adaptadas y bajo demanda. Tambi茅n se presentan metodolog铆as y mecanismos de composici贸n de servicios para operar sobre esta arquitectura, y posteriormente, se propone su uso (en conjunci贸n o no con la arquitectura FN) en los dos campos de estudio. Por 煤ltimo, se presenta la investigaci贸n y desarrollo realizado en el 谩mbito de las redes inteligentes, proponiendo varias partes de la infraestructura SDU con ejemplos de aplicaci贸n de composici贸n de servicios para dise帽ar seguridad din谩mica y flexible o la orquestaci贸n y gesti贸n de servicios y recursos dentro de la infraestructura de la empresa el茅ctrica.This thesis revolves around the hypothesis the service composition methodology and mechanisms and how they can be applied to different fields of application in order to efficiently orchestrate flexible and context-aware communications and processes. More concretely, it focuses on two fields of application that are the context-aware media distribution and smart grid services and infrastructure management, towards a definition of a Software-Defined Utility (SDU), which proposes a new way of managing the Smart Grid following a software-based approach that enable a much more flexible operation of the power infrastructure. Hence, it reviews the context, requirements and challenges of these fields, as well as the service composition approaches. It makes special emphasis on the combination of service composition with Future Network (FN) architectures, presenting a service-oriented FN proposal for creating context-aware on-demand communication services. Service composition methodology and mechanisms are also presented in order to operate over this architecture, and afterwards, proposed for their usage (in conjunction or not with the FN architecture) in the deployment of context-aware media distribution and Smart Grids. Finally, the research and development done in the field of Smart Grids is depicted, proposing several parts of the SDU infrastructure, with examples of service composition application for designing dynamic and flexible security for smart metering or the orchestration and management of services and data resources within the utility infrastructure
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