Collaborative Research (NSF-CNPq): Application Level Adaptation and Control for Retrieval and Delivery of Continuous Media over the Internet

协作研究 (NSF-CNPq)：通过互联网检索和交付连续媒体的应用程序级适应和控制

• 批准号: 0070067
• 负责人: Donald Towsley
• 金额: $ 5.92万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-10-01 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0070067&HistoricalAwards=false
• 关键词: Collaborative; Research; NSF; CNPq; Application

Future networked multimedia information systems will carry a wide variety of applications including digital libraries, video, audio and image services, distance learning and collaboration, networked virtual environments, and entertainment. The main characteristics of multimedia applications that lead to difficulties in end-to-end systems design are that they have very large bandwidth and storage requirements, with vastly different performance and reliability requirements, often coupled with real-time constraints. Along with these characteristics, the highly interreliability requirements, often coupled with real-time constraints. Along with these characteristics, the highly interactive nature of a variety of multimedia applications, resulting in fairly unpredictable workloads, makes the design and evaluation of networked multimedia information systems an exceptionally challenging problem. In this proposal, we outline research on three aspects of this problem: (1) the design and evaluation of server resource allocation algorithms for CM servers in order to retrieve information efficiently and according to the QoS demanded by the application; (2)the development of performance evaluation techniques for evaluating new server designs. (3) the participants of this project bring expertise from a wide variety of areas: databases, distance learning, multi-media, networking, and performance evaluation to bear on problems in these areas. Another important feature of this proposal is that the participants have available four prototypes of state of the art multimedia systems: the Virtual World Data Server (VWDS) developed at UCLA: the prototype of a Video-on-Demand server developed in Brazil as part cooperative research project among Brazilian institutions; and the Multimedia Asynchronous Networked Individualized Courseware (MANIC) and the Internet Multimedia Proxy (IMP) both developed at UMass. These applications will be used to motivate the development of new algorithms for retrieving information and for maintaining the desired quality of service after sending the data over a wide area network. They will also form the basis of the many experimental and analytical studies that will be performed to evaluate these new algorithms. To aid in this evaluation, our group also developed three performance evaluation and modeling tools: a state-of-the-art tool for constructing performance and reliability models (Tangram-II) developed in Brazil jointly with UCLA; a symbolic model checking tool (VERUS): and a tool which facilitates design, development, and subsequent performance evaluation of designs of multimedia storage hierarchies (ViPEr-HiSS) under development at UMD. Thus, the environment of our labs as well the long distance among them will provide a unique testbed for this type of an evaluation due to the drastically different connectivities available to our applications, from gigabit low utilized links to intercontinental congested links. The proposed research represents a fundamentally important step in the design and performance evaluation of next generation information servers and the networked applications that will operate on top of them. As a result of our research we expect to have a better understanding of how storage server resource management policies, channel allocation policies, and network adaptation policies interact to satisfy the required QoS of CM applications, despite the fairly unpredictable network delays.

未来的网络化多媒体信息系统将承载各种各样的应用，包括数字图书馆、视频、音频和图像服务、远程学习和协作、网络化虚拟环境以及娱乐。 导致端到端系统设计困难的多媒体应用的主要特征是，它们具有非常大的带宽和存储要求，具有截然不同的性能和可靠性要求，并且通常与实时约束相结合。 沿着这些特点，高度的互可靠性要求，往往伴随着实时性的约束。 沿着这些特点，各种多媒体应用程序的高度交互性，导致相当不可预测的工作量，使网络多媒体信息系统的设计和评估一个非常具有挑战性的问题。 在本提案中，我们概述了对这一问题的三个方面的研究： (1)CM服务器资源分配算法的设计和评估，以有效地检索信息，并根据应用程序所需的QoS; （2）开发性能评估技术，用于评估新的服务器设计。 (3)该项目的参与者带来了各种领域的专门知识：数据库、远距离学习、多媒体、联网和绩效评估，以解决这些领域的问题。 这项建议的另一个重要特点是，参与者可利用四种最先进的多媒体系统原型：在加州大学洛杉矶分校开发的虚拟世界数据服务器;在巴西开发的视频点播服务器原型，作为巴西各机构合作研究项目的一部分;以及麻省大学开发的多媒体异步网络个性化课程（MANIC）和因特网多媒体代理（IMP）。 这些应用程序将被用来推动开发新的算法，用于检索信息和在广域网上发送数据后保持所需的服务质量。 它们也将成为许多实验和分析研究的基础，这些研究将用于评估这些新算法。 为了帮助在这一评估，我们的小组还开发了三个性能评估和建模工具：一个国家的最先进的工具，用于构建性能和可靠性模型（Tangram-II）在巴西联合开发的加州大学洛杉矶分校;一个符号模型检查工具（VERUS）：和一个工具，方便设计，开发，并随后的性能评估的设计多媒体存储层次结构（ViPER-HiSS）正在开发中UMD。 因此，我们实验室的环境以及它们之间的长距离将为这种类型的评估提供一个独特的测试平台，因为我们的应用程序可以使用截然不同的连接，从千兆低利用率链路到洲际拥塞链路。 拟议中的研究代表了下一代信息服务器和网络应用程序，将在他们之上运行的设计和性能评估的一个根本性的重要步骤。 作为我们的研究结果，我们希望有一个更好的理解如何存储服务器资源管理政策，通道分配政策，网络自适应政策相互作用，以满足所需的服务质量的CM应用程序，尽管相当不可预测的网络延迟。