COLLABORATIVE RESEARCH: An Experimental Study of Broadcasting Protocols for Video-on-Demand

提案号CCR-9988363视频点播广播协议的实验研究要使视频点播服务更具竞争力，最有希望的方法之一就是连续播放最常被请求的视频。 本研究针对现有的视频点播广播协议的三个主要局限性进行了研究。第一个研究方向是开发能够处理具有可变带宽要求的压缩视频的广播协议。这些新协议的性能将使用DVD所使用的MPEG-2格式的代表性视频集进行评估。第二个研究方向是有效地实现类似于VCR上的交互功能。 这些功能将允许客户暂停、向后和向前移动，就像他们在观看视频资产一样。第三个研究方向是设计广播协议，可以根据所有观察到的请求到达率的变化来调整广播时间表。 因此，这些动态广播协议将在高峰时段和低需求时段同样表现良好。所有这些广播协议将在一个非常简单的测试平台上进行演示，该测试平台由一个广播几个特定视频的工作站组成。这是加州大学圣克鲁斯分校和休斯顿大学之间的一个合作研究项目。

Proposal Number CCR-9988363An Experimental Study of Broadcasting Protocols for Video-on-DemandPI: D.E. LongOne of the most promising approaches to making video-on-demand servicesmore competitive is to continuously broadcast the most frequently requestedvideos. This research addresses three important limitations common to mostexisting broadcasting protocols for video-on-demand.A first research direction is the development of broadcasting protocolsthat can handle compressed videos having variable bandwidth requirements.The performance of these new protocols will be evaluated using arepresentative set of videos in the MPEG-2 format used by DVD. A second research direction is the efficient implementation of interactivefunctions analogous to those existing on a VCR. These functions will allowcustomers to pause, move backward and forward as if they were watching avideocassette.A third research direction is the design of broadcasting protocols that canadjust their broadcasting schedules to all observed changes in the requestarrival rate. As a result, these dynamic broadcasting protocols willperform equally well at peak hours and at hours of lower demand.All these broadcasting protocols will be demonstrated on a very simpletestbed consisting of a single workstation broadcasting a few specific videos. This is a collaborative research project between the University ofCalifornia, Santa Cruz and the University of Houston.