Packet Network Architecture and Prorocols for Video Services

在这个项目的过程中，首席研究员将研究一类新的分组交换网络的设计和性能，称为突发调度网络，用于支持多媒体应用。突发调度网络是为传输视频、音频和数据流量而设计的，其特点是：(i)在信道调度中使用虚拟时钟值，（ii）数据包流（特别是视频流）在突发中得到有效处理，以及（iii）为满足流规范的数据包流提供延迟和延迟抖动保证（我们最近对MPEG视频的研究激发了一种新的数据包视频模型）。拟议项目的主要目标是研究网络设计问题，例如统计与确定性性能保证、需求分配策略、高效调度算法、容错架构和协议、音频和延迟敏感数据流量建模、流量控制和缓冲区管理策略。拟议项目的第二个目标是研究传输协议的设计和原型，该协议利用突发调度网络提供的性能保证来支持多媒体应用程序。一些提出的研究问题将使用数学方法进行调查。所有的研究问题将在计算机科学系的网络研究实验室进行实验研究。具体来说，我们计划在突发调度网络模拟器中添加功能，以实现拟议的研究活动。模拟器将在高性能工作站上运行，并将连接到其他工作站上，其中原型传输协议和真正的多媒体应用程序将运行，向模拟器提供视频、音频和数据流。*** *******达琳费舍尔项目经理网络和通信研究项目4201威尔逊大道。阿灵顿1175室，Va 22230(703) 306-1949(703) 306-0621（传真）

9506048 Lam During the course of this project, the principal investigator will investigate the design and performance of a new class of packet switching networks, called Burst Scheduling networks, for supporting multimedia applications. Burst Scheduling networks are designed for carrying video, audio, and data traffic, and characterized by: (i) use of virtual clock values in channel scheduling, (ii) packet flows (in particular, video flows) processed efficiently in bursts, and (iii) delay and delay jitter guarantees provided to packet flows that satisfy a Flow Specification (a new model of packet video motivated by our recent study of MPEG video). The primary objective of the proposed project is to investigate network design issues, such as, statistical versus deterministic performance guarantees, demand assignment strategies, efficient scheduling algorithms, fault-tolerant architecture and protocols, modeling of audio and delay-sensitive data traffic, flow control and buffer management strategies. The secondary objective of the proposed project is to investigate the design and prototyping of a transport protocol that makes use of performance guarantees provided by Burst Scheduling networks to support multimedia applications. Some of the proposed research problems will be investigated using mathematical methods. All of the research problems will be investigated experimentally in the Networking Research Laboratory of the Department of Computer Sciences. Specifically, we plan to add capabilities to a simulator of Burst Scheduling networks to enable the proposed research activities. The simulator will be run on a high-performance workstation and will be connected to other workstations where the prototype transport protocol and a real multimedia application will be run, supplying video, audio, and data flows to the simulator. *** ******* Darleen Fisher Program Manager Networking and Communications Research Program 4201 Wilson Blvd. Roo m 1175 Arlington Va 22230 (703) 306-1949 (703) 306-0621 (FAX)