Internet Congestion Control: Design, Modeling, and Analysis

未来的高速网络将比任何现有网络都要大得多，也更复杂。 应用程序、中间件和传输协议以及路由器/交换机资源管理算法的多样性和相互作用将使这些网络的设计、开发、控制、管理和评估成为一项异常困难的任务。网络控制体系结构中最关键的组件之一是与拥塞控制有关的组件。到目前为止，互联网一直依赖于加性增加，乘性减少机制，发现在大多数变化的TCP，拥塞控制。然而，人们越来越认识到，在未来的高速网络中，需要能够与TCP共存的新的拥塞控制机制。这是由于越来越需要提供异构应用程序的要求，因为许多未来的应用程序将依赖于多播。因此，TCP拥塞控制不足以处理异质性或多播。 还需要一种更好的方法来建模和分析TCP性能和未来拥塞控制算法的性能。这种方法的发展是特别需要的，以评估的TCP会话和未来的非TCP会话的混合的行为，以避免任何不愉快的惊喜，因为他们被部署。该提案描述了两个广泛领域的新的基础研究： （1）基于公式的拥塞控制。研究者提出了一种新的基于速率的拥塞控制方法。 该项目引入了一种基于公式的方法，在该方法中，会话监控其端-端丢失率，并相应地调整其传输速率。研究表明，这可以用来构建一个TCP友好的速率控制算法，然后概述了一个研究议程，探索和利用这种方法来支持组播应用程序的潜力，并支持异构应用程序。 （2）拥塞控制算法的性能评价。研究者提出了基于随机微分方程的拥塞控制算法的性能评估研究。 该研究为理解、设计和分析下一代传输协议所需的拥塞控制算法迈出了重要的一步。

Future high-speed networks will be significantly larger and more complex than any existing network. The variety and interaction of the applications, the middleware and transport protocols, and the router/switch resource management algorithms will make the design, development, control, management and evaluation of these networks an exceptionally difficult task. One of the most critical components in the network control architecture is that concerned with congestion control. The Internet has relied till now on the additive increase, multiplicative decrease mechanism, found in most variations of TCP, for congestion control. There is increasing recognition, however, that new congestion control mechanisms, which will be able to coexist with TCP, are needed in future high speed networks. This is due to the increasing need to provide for heterogeneous application requirements and because of many future applications will rely on multicast. As is, TCP congestion control is inadequate for handling either heterogeneity or multicast. There is also a need for a better methodology for modeling and analyzing the TCP performance and the performance of coming congestion control algorithms. The development of such a methodology is especially needed to evaluate the behavior of a mix of TCP sessions and future non-TCP sessions so as to avoid any unpleasant surprises as they are deployed. This proposal describes new and fundamental research in two broad areas: (1)Formula-based congestion control. The researcher proposes research on a new approach to rate-based congestion control. The project introduces a formula-based approach in which a session monitors its end-end loss rate and adapts its transmission rate accordingly. The research shows how this can be used to construct a TCP-friendly rate control algorithm and then outline a research agenda for exploring and exploiting the potential of this approach to support multicast applications, and to support heterogeneous applications. (2)Performance evaluation of congestion control algorithms. The researcher proposes research on the performance evaluation of different congestion control algorithms based on the use of stochastic differential equations. This proposed research represents a fundamentally important step in the understanding, design, analysis of congestion control algorithms needed by the next generation transport protocols.