CAREER: Next-Generation Peer-to-Peer Streaming: Theory and Design

P2P(Peer-to-Peer)技术使得互联网上的大规模流媒体服务成为可能。下一代P2P流媒体系统的成功在很大程度上取决于提供更高水平的效率、健壮性和激励机制的新设计。与此同时，P2P流媒体系统的日益普及和高流媒体速率已经在运营商的网络内部产生了巨大的流量压力。未来P2P流媒体系统的运行将对全球网络基础设施的稳定性和效率产生重大影响。PI和他的博士生们正在为下一代P2P流媒体系统开发新的理论和设计。他们研究P2P流媒体中的服务差异化以解决节点的异构性并提供激励，推导出实时P2P流媒体的最小延迟界，并提出逼近该界的流媒体算法。他们将低延迟流媒体算法应用于实时视频流和3D流媒体。他们开发了对互联网服务提供商友好的P2P流媒体设计，以极大地减少P2P流媒体应用程序对互联网服务提供商网络造成的流量压力。他们还为拟议的新设计建造原型。该项目的研究将导致开放的协议、软件和工具，使大量的开发人员、研究人员和公司能够扩展、改进和发展下一代P2P流媒体系统。本项目中开发的重要见解和关键技术也可以推广到研究一般分布式系统中的数据流，如内容交付网络和分布式数据中心。

Peer-to-Peer (P2P) technology has enabled large-scale streaming services on the Internet. The success of the next-generation P2P streaming systems largely hinges on new designs delivering a higher level of efficiency, robustness and incentives. At the same time, the increasing popularity and high-streaming rate of P2P streaming systems have already generated significant traffic stress inside ISPs' networks. The operations of future P2P streaming systems will have significant impact on the stability and efficiency of the global network infrastructure. The PI and his PhD students are developing new theory and design for the next generation P2P streaming systems. They study the service differentiation in P2P streaming to address peer heterogeneity and provide incentives.They derive the minimum delay bounds for realtime P2P streaming and propose streaming algorithms to approach the bounds. They apply the low-delay streaming algorithms to live video streaming and 3D streaming. They develop ISP-friendly P2P streaming design to largely reduce the traffic stress imposed on ISP networks by P2P streaming applications. They also build prototypes for the proposed new designs. The research of this project will lead to open protocols, software and tools, allowing a multitude of developers, researchers, and companies to expand, improve, and evolve the next-generation P2P streaming systems. Important insights and key techniques developed in this project can also be generalized to study data streaming in general distributed systems, such as Content Delivery Networks and distributed data centers.