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Maximizing the number of users in an interactive video-on-demand system

机译：在交互式视频点播系统中最大化用户数量

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摘要

Video prefetching is a technique that has been proposed for the transmission of variable-bit-rate (VBR) videos over packet-switched networks. The objective of these protocols is to prefetch future frames at the customers' set-top box (STB) during light load periods. Experimental results have shown that video prefetching is very effective and it achieves much higher network utilization (and potentially larger number of simultaneous connections) than the traditional video smoothing schemes. The previously proposed prefetching algorithms, however, can only be efficiently implemented when there is one centralized server. In a distributed environment there is a large degradation in their performance. In this paper we introduce a new scheme that utilizes smoothing along with prefetching, to overcome the problem of distributed prefetching. We show that our scheme performs almost as well as the centralized prefetching protocol even though it is implemented in a distributed environment. In addition, we introduce a call admission control algorithm for a fully interactive video-on-demand (VoD) system that utilizes this concept of distributed video prefetching. Using the theory of effective bandwidths, we develop an admission control algorithm for new requests, based on the user's viewing behavior and the required quality of service (QoS).
机译：视频预取是一种已提出的用于在分组交换网络上传输可变比特率（VBR）视频的技术。这些协议的目的是在轻负载期间在客户的机顶盒（STB）上预取将来的帧。实验结果表明，与传统的视频平滑方案相比，视频预取非常有效，并且可以实现更高的网络利用率（并发连接数量可能更多）。但是，仅在有一个集中式服务器时才能有效地实现先前提出的预取算法。在分布式环境中，它们的性能会大大降低。在本文中，我们介绍了一种利用平滑和预取的新方案，以克服分布式预取的问题。我们表明，即使在分布式环境中实现，我们的方案也能执行与集中式预取协议几乎一样的性能。此外，我们为利用此分布式视频预取概念的完全交互式视频点播（VoD）系统引入了一种呼叫准入控制算法。利用有效带宽理论，我们根据用户的观看行为和所需的服务质量（QoS），为新请求开发了一种准入控制算法。

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