2,393 research outputs found
Avoiding Interruptions - QoE Trade-offs in Block-coded Streaming Media Applications
We take an analytical approach to study Quality of user Experience (QoE) for
video streaming applications. First, we show that random linear network coding
applied to blocks of video frames can significantly simplify the packet
requests at the network layer and save resources by avoiding duplicate packet
reception. Network coding allows us to model the receiver's buffer as a queue
with Poisson arrivals and deterministic departures. We consider the probability
of interruption in video playback as well as the number of initially buffered
packets (initial waiting time) as the QoE metrics. We characterize the optimal
trade-off between these metrics by providing upper and lower bounds on the
minimum initial buffer size, required to achieve certain level of interruption
probability for different regimes of the system parameters. Our bounds are
asymptotically tight as the file size goes to infinity.Comment: Submitted to ISIT 2010 - Full versio
CliqueStream: an efficient and fault-resilient live streaming network on a clustered peer-to-peer overlay
Several overlay-based live multimedia streaming platforms have been proposed
in the recent peer-to-peer streaming literature. In most of the cases, the
overlay neighbors are chosen randomly for robustness of the overlay. However,
this causes nodes that are distant in terms of proximity in the underlying
physical network to become neighbors, and thus data travels unnecessary
distances before reaching the destination. For efficiency of bulk data
transmission like multimedia streaming, the overlay neighborhood should
resemble the proximity in the underlying network. In this paper, we exploit the
proximity and redundancy properties of a recently proposed clique-based
clustered overlay network, named eQuus, to build efficient as well as robust
overlays for multimedia stream dissemination. To combine the efficiency of
content pushing over tree structured overlays and the robustness of data-driven
mesh overlays, higher capacity stable nodes are organized in tree structure to
carry the long haul traffic and less stable nodes with intermittent presence
are organized in localized meshes. The overlay construction and fault-recovery
procedures are explained in details. Simulation study demonstrates the good
locality properties of the platform. The outage time and control overhead
induced by the failure recovery mechanism are minimal as demonstrated by the
analysis.Comment: 10 page
Video streaming over p2p using AQCS algorithm
P2p streaming has been popular and is expected to attract even more users. The proposed scheme can achieve high bandwidth utilization and optimal streaming rate possible in ap2p streaming system. The prototype implementing the queue based scheduling is developed and used to evaluate the scheme in real network. between one or more number of clients running un trusted code into controlled environment to a remote host that has opted into communication from that of the code p2p network which is use in case of The distribution of the videos. where proposed design which enables flexible customization of video streams to support heterogeneous of receivers, highly utilizes upload bandwidth of peers, and quickly adapts to network and peer dynamic
System analysis of a Peer-to-Peer Video-on-Demand architecture : Kangaroo
Architectural design and deployment of Peer-to-Peer Video-on-Demand (P2PVoD) systems which support VCR functionalities is attracting the interest of an increasing number of research groups within the scientific community; especially due to the intrinsic characteristics of such systems and the benefits that peers could provide at reducing the server load. This work focuses on the performance analysis of a P2P-VoD system considering user behaviors obtained from real traces together with other synthetic user patterns. The experiments performed show that it is feasible to achieve a performance close to the best possible. Future work will consider monitoring the physical characteristics of the network in order to improve the design of different aspects of a VoD system.El disseny arquitectònic i el desplegament de sistemes de Vídeo sota Demanda "Peer-to-Peer" que soporten funcionalitats VCR està captant l'interès d'un nombre creixent de grups de recerca a la comunitat científica, degut especialment a les característiques intrínsiques dels mencionats sistemes i als beneficis que els peers podrien proporcionar a la reducció de la càrrega en el servidor. Aquest treball tracta l'anàlisi del rendiment d'un sistema P2P-VoD considerant el comportament d'usuaris obtingut amb traçes reals i amb patrons sintètics. Els experiments realitzats mostren que és viable assolir un rendiment proper al cas més óptim. Com treball futur es considerarà la monitorització de les característiques físiques de la xarxa per a poder millorar el disseny dels diferents aspectes que formen un sistema de VoD.El diseño arquitectónico y el despliegue de sistemas de Video bajo Demanda "Peer-to-Peer" que soportan funcionalidades VCR está captando el interés de un número creciente de grupos de investigación dentro de la comunidad científica; especialmente debido a las características intrínsecas de tales sistemas y a los beneficios que los peers podrían proporcionar en la reducción de la carga en el servidor. Este trabajo se enfoca en el análisis de rendimiento de un sistema P2PVoD considerando el comportamiento de usuarios obtenido de trazas reales, junto a otros patrones sintéticos. Los experimentos realizados muestran que es viable lograr un rendimiento cercano al caso más óptimo. El trabajo futuro considerará la monitorización de las características físicas de la red para poder mejorar el diseño de los diferentes aspectos que conforman un sistema de VoD
Integrate Airtime Metric and Geocast over P2P-Based VoD Streaming Cache
[[abstract]]Peer-to-peer based systems have been widely proposed to provide the Video-on-Demand (VoD) service on the Internet in recent years.With the development of mobile networks, we proposed a suitable VoD system for mobile networks, in which peers are classified into groups and the backbone networks are established so that peers in the same group can share and transmit the streaming videos through the backbone networks. Further, mobile nodes that are not located at the backbone networks can receive the streaming videos through the Wireless Mesh Networks (WMNs). Through our path selection mechanism, peers can route faster and the system will be load-balancing. By considering the influence of the locality to mobile nodes, we delimit the new range of WMNs. In addition, according to the Airtime metric proposed in IEEE 802.11s, the Airtime cost of every mesh loop is calculated and the optimal path thus can be figured out.[[notice]]補正完畢[[incitationindex]]SCI[[incitationindex]]EI[[booktype]]紙
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