![]() We use the analytical results to compare VUD with ISO. For both of these designs, we develop efficient algorithms to calculate critical performance measures, develop an asymptotic theory to provide closed-form results when the number of peers approaches infinity, and derive nearoptimal provisioning rules for assigning peers to groups in VUD. We apply the queueing network models to two P2P streaming designs: the isolated channel design (ISO) and the View-Upload Decoupling (VUD) design. Our models capture essential aspects of multi-channel video systems, including peer channel switching, peer churn, peer bandwidth heterogeneity, and Zipf-like channel popularity. In this paper, we develop infinite-server queueing network models to analytically study the performance of multi-channel P2P streaming systems. Existing and future P2P live video systems will offer a large number of channels, with users switching frequently among the channels. I.Ībstract-In recent years there have been several large-scale deployments of P2P live video systems. ![]() To the best of our knowledge, this is the first work to identify and study these trade-offs, and to demonstrate the potential benefits of the resulting prioritization heuristics. We conduct a systematic study of the trade-offs using both real trace data, and sensitivity studies using synthetic workloads. The second part of the paper considers bandwidth allocation and prioritization policies with multi-tree data delivery in environments with heterogeneity in outgoing bandwidth and a certain degree of altruistic behavior. The first part of the paper considers prioritization strategies in the context of heterogeneity in node outgoing bandwidth and node stay time durations, and a lack of correlation between the two dimensions. We identify trade-offs in the design of prioritization heuristics in two important contexts. In this paper, we highlight and show the need to systematically consider prioritization as a key criterion in the design of protocols for overlay multicast. Categories and Subject DescriptorsĪbstract - Hosts participating in overlay multicast applications have a wide range of heterogeneity in bandwidth and participation characteristics. We achieve typical end-to-end delays of 1 sec, and a stable video quality with less than 2.5 % of frames lost to playout interruptions. Experiments for several hundred hosts simulated in NS-2 illustrate the benefits of our system. Distortion-optimized retransmission requests are issued by receiving hosts to recover the most important missing packets while limiting the induced congestion. The video stream transmitted by the source contains H.264 SP and SI frames, which are used to adaptively stop error propagation due to packet loss. A rate-distortion model which predicts endto-end video quality in throughput limited environments is presented and used to determine the over-provisioning necessary to avoid self-inflicted congestion. This work presents a new peer-to-peer multicast protocol and analyzes the gains that video coding and prioritized packet scheduling at the application layer can bring to the overall streaming performance. Hosts which may disconnect at any time, therefore a robust control protocol is needed to maintain connectivity among peers. We study peer-to-peer multicast streaming, where a source distributes real-time video to a large population of hosts by making use of their forwarding capacity rather than relying on dedicated media servers.
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