Análisis de la calidad del streaming de vídeo a través de redes OBS

Las redes de conmutación de ráfagas sobre fibra óptica cobran fuerza como la mejor opción para las redes troncales en un futuro a corto medio plazo y, ante el auge de uso del streaming de vídeo, se hace necesario un análisis profundo de la calidad de la transmisión de vídeo en estas redes. Para ello se ha simulado el envío de tráfico de vídeo con un ancho de banda agregado suficiente para la transmisión de vídeo en alta definición o varios decenas a cientos de vídeos de baja calidad, a través de una red OBS la cual se simula con los parámetros más usuales en este tipo de redes. Se utilizan los tres protocolos de ensamblado más extendidos en las diversas investigaciones sobre este campo, es decir, ensamblado con límite de tiempo, con límite de tamaño y ensamblado híbrido siendo el objetivo analizar cuál es el que produce una degradación menor en el vídeo transmitido.The optical burst switching networks gain strength as the best option in short-medium term future for backbone networks, address the increase of the video streaming usage, a deep analysis of video transmission quality of these networks becomes necessary. For that purpose diverse video send has been simulated, with an aggregated bandwith high enough for the transmission of High Definition Video or some dozens or hundreds of low quality video streaming through the OBS network, which is simulated with the more usual parameters in this networks. The three assembly protocols most extended in the researches about this issue are used, namely, time limited, size limited and hybrid assembly protocols, with the objective of analyze which is the one that produce less degradation in the transmitted video.Campos Rodríguez, J. (2009). Análisis de la calidad del streaming de vídeo a través de redes OBS. http://hdl.handle.net/10251/34878.Archivo delegad

High data-rate video broadcasting over 3G wireless systems

In cellular environments, video broadcasting is a challenging problem in which the number of users receiving the service and the average successfully decoded video data-rate have to be intelligently optimized. When video is broadcasted using the 3G packet data standard, 1xEV-DO, the code space may be divided among the multiple layers if scalable video coding is employed. In this paper, we propose a novel, multi-objective optimized video broadcasting scheme for 1xEV-DO and investigate the feasibility of using multiple layers for transmission. The multi-objective optimization aims to find the best compromise between maximizing the average decodable video data-rate and minimizing the basic quality video outage probability. Simulations conducted for the ITU Pedestrian A and Vehicular B channels show that high data-rates with low outages are possible when 1xEV-DO is used for video broadcasting, however, it may not be desirable to use scalable video coding for this purpos