NeTS-NBD: Efficient Delivery of Video-on-Demand Streams to Heterogeneous Receivers

0626861萨汉视频点播（VOD）为客户提供方便、选择和控制。它采用流媒体，这意味着播放可以在用户开始接收数据后不久开始，而不是等待整个视频下载。除了用于娱乐之外，VOD在教育，特别是远程学习方面也非常重要。多媒体数据所需的实时和高速率传输严重限制了可以并发处理的请求数量。因此，已经提出了许多资源共享技术，通过仅使用一个流来服务同一视频的多个请求来解决这个问题。然而，由于客户机的异构性，特别是在下载带宽方面，实现的资源共享在实际环境中受到限制。本研究研究了VOD服务器如何在以客户端拉动方式传输数据的同时支持异构接收器。它开发了新的适合异构环境的资源共享方案和调度策略，并利用分层视频编码的独特特性提供了一个全面而高效的解决方案。此外，它还解决了可用客户端带宽随时间变化和交互式操作应用所带来的挑战。本研究将对未来VOD服务器的设计和VOD服务的成功产生重要影响。更广泛的影响本研究为参与的学生提供了学习多媒体服务器设计和获得重要研究经验的独特机会。此外，该系的研究生从整合新课程的研究成果中受益匪浅。

0626861 SarhanVideo-on-Demand (VOD) provides customers with convenience, choice, and control. It employs streaming, which means the playback can start shortly after the user begins receiving the data as opposed to waiting for the entire video to download. Besides its use for entertainment, VOD has been of great importance in education, distance learning in particular. The required real-time and high-rate transfers for multimedia data severely limit the number of requests that can be serviced concurrently. Thus, numerous resource sharing techniques have been proposed to address this problem by servicing multiple requests for the same video using only one stream. The achieved resource sharing, however, is limited in real environments because of client heterogeneity, especially in terms of the download bandwidth. This research studies how VOD servers can support heterogeneous receivers while delivering data in a client-pull fashion. It develops new resource sharing schemes and scheduling policies that are well-suited for the heterogeneous environment and utilizes the unique characteristics of Layered Video Coding to provide a comprehensive and efficient solution. Moreover, it addresses the challenges caused by the variation in the available client bandwidth over time and the application of interactive operations. This research is expected to have significant impacts on the design of future VOD servers and the success of VOD services. Broader ImpactsThis research provides participating students with unique opportunities for learning multimedia server design and gaining important research experience. In addition, the department's graduate students greatly benefit from integrating the research results in new courses.