In this paper, we propose a loopback approach in a two-level streaming architecture to exploit collaborative client/proxy buffers for improving the quality and efficiency of large-scale streaming applications. At the upper level we use a Content Delivery Network (CDN) to deliver video from a central server to proxy servers. At the lower level a proxy server delivers video with the help of collaborative client caches. In particular, a proxy server and its clients in a local domain cache different portions of a video and form delivery loops. In each loop, a single video stream originates at the proxy, passes through a number of clients, and finally is passed back to the proxy. As a result, with limited bandwidth and storage space contributed by collaborative clients, we are able to significantly reduce the required network bandwidth, I/O bandwidth, and cache space of a proxy. Furthermore, we develop a local repair scheme to address the client failure issue for enhancing service quality and eliminating most required repairing load at the central server. For popular videos, our local repair scheme is able to handle most of single-client failures without service disruption and retransmissions from the central server. Our analysis and simulations have shown the effectiveness of the proposed Loopback Scheme.
Abstract-We present an integrated network resource and QoS management framework based on the idea of decoupling the network control plane from the data plane. Our framework is capable of providing perflow QoS guarantees using scalable core-stateless packet forwarding mechanism at the network core. Virtual Time Reference System provides the abstraction of the data plane. Bandwidth broker performs all control and resource management functions while router functionality is kept mnimal to make the performance of its main function, packet forwarding, efficient. We present the bandwidth broker architecture, its modules and their implementations as well as the implementation of the packet forwarding mechanism at the routers. We describe also the design of the interface between the bandwidth broker and the routers as well as the interface between the bandwidth broker and the users (applications).
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