ITR: Collaborative Research:Scalable Quality-of-Service Control for the Next Generation Internet: Fundamental Challenges and Effective Solutions

今天的互联网的巨大成功归功于25年前设计的简单的“沙漏”IP网络协议体系结构。近年来，随着网络技术的快速发展和多媒体内容的爆炸式增长，网络社区发现自己正处于一个重要的十字路口：下一代Internet体系结构应该是什么？有一个多维频谱ofpossible方法来提供QoS保证。为下一代Internet选择QoS解决方案将对Internet本身的发展和它所能实现的功能产生重大影响。做出“正确”的选择需要对QoS控制的可扩展性以及这些控制对QoS提供效率的影响有基本的了解。拟议研究的目标是开发一个全面的、定量的理解，在各种方法中涉及的基本权衡，以提供可扩展的QoS保证。为此，研究人员将开发连贯的理论来系统地解决QoS控制中的可扩展性问题。 该研究计划大致分为四个领域：保证流的聚合网络演算：为了彻底了解精细的时间尺度（例如，为了研究网络系统在提供QoS性能保证方面的（数据包级）行为，研究人员将开发一种聚合网络演算来研究聚合QoS控制机制对数据平面操作的性能和复杂性的影响。该理论是为并行流开发的，并行流要求网络在每个流或聚合级别上提交一定量的资源（例如，带宽和缓冲区）。聚合网络演算将提供一个数学框架来量化聚合QoS控制对QoS提供的基本权衡的影响，它还将为可扩展数据平面QoS控制机制的设计提供见解。响应流的端到端QoS控制：研究人员将开发流体模型来研究聚合QoS控制机制对响应流的端到端性能的影响。响应流通过调整其传输速率来响应网络拥塞的迹象，例如丢失。这些模型将使我们能够更好地理解响应流的行为，如TCP耦合不同的聚合QoS机制，并为响应流设计端到端的QoS服务，QoS控制律和控制平面聚合规则。 研究人员将开发QoS控制律，用于捕获网络的慢时间尺度，系统范围的行为，以及解决聚合QoS控制下控制平面操作的性能和复杂性的聚合规则。这些QoS控制律和聚合规则将引导我们设计用于可扩展控制平面操作的分布式和集中式算法。可扩展的QoS机制和服务架构作为这些理论发展的一个组成部分，研究人员还将设计有效的和可扩展的QoS机制，以及量化和评估各种QoS解决方案的权衡的工具和技术。基于这些工作的结果，研究人员将研究如何将各种QoS解决方案结合起来构建有意义的端到端服务。研究将融合正式建模/分析，实验/实施和评估。作为研究的结果，获得的理解和见解将导致建立的理论，设计原则和指导方针，为未来的互联网建设可扩展的QoS控制。这反过来又将允许在下一代互联网形成时做出合理和知情的选择。

Today's Internet owes its great success to the simple, "hour-glass" IP network protocol architecture laidout twenty-five years ago. With rapid advances in networking technologies and explosive growth of richmultimedia content in recent years, the networking community finds itself at an important crossroads: whatshould be the next generation Internet architecture for controlling network resources and provide the qualityof service (QoS) needed by emerging multimedia applications? There is a multidimensional spectrum ofpossible approaches to providing QoS guarantees. The choice of a QoS solution for the next generationInternet will have a substantial impact on both the evolution of the Internet itself, and on what it enables.Making the "right" choices requires the development of a fundamental understanding of the scalability ofQoS controls and the impact of these controls on the efficacy of QoS provisioning.The goal of the proposed research is to develop a comprehensive, quantitative understanding of thefundamental trade-offs involved in various approaches toward providing scalable QoS guarantees. To thisend, the researchers will develop coherent theories to systematically address the issue of scalability in QoS controls. The research program divides broadly into four areas:Aggregate network calculus for guaranteed flows: To gain a thorough understanding of the fine time-scale(e.g., packet-level) behavior of a network system in providing QoS performance guarantees, the researcherswill develop an aggregate network calculus to study the impact of aggregate QoS control mechanismson the performance and complexity of data plane operations. This theory is developed for guaranteedflows - flows which require the network to commit, either at a per-flow or an aggregate level, acertain amount of resources (e.g., bandwidth and buffer) throughout their life time, regardless of thenetwork congestion status. The aggregate network calculus will provide a mathematical frameworkto quantify the impact of aggregate QoS controls on the fundamental trade-offs in QoS provisioning.It will also yield insights into the design of scalable data plane QoS control mechanisms.End-to-end QoS controls for responsive flows: The researchers will develop fluid models to study the impact of aggregate QoS control mechanisms on the end-to-end performance of responsive flows. A responsiveflow responds to signs of network congestion, such as loss, by adapting its transmission rate. Thesemodels will enable us to develop a better understanding of the behavior of responsive flows such asTCP coupled with different aggregate QoS mechanisms and to design end-to-end QoS services forresponsive flows.QoS control laws and control plane aggregation rules. The researchers will develop QoS control laws for capturing the slow time-scale, system-wide behavior of a network and aggregation rules that address the performance and complexity of control plane operations under aggregate QoS controls. These QoS controllaws and aggregation rules will lead us to the design of distributed and centralized algorithms forscalable control plane operations.Scalable QoS mechanisms and service architectures as an integral part in developing these theories, the researchers will also design effective and scalable QoS mechanisms, and tools and techniques for quantifying and evaluating the trade-offs of various QoS solutions. Based on the results from these efforts, the researchers will study how various QoS solutions can be combined to construct meaningful end-to-end services.The research will blend formal modeling/analysis, experimentation/implementation, and evaluation. Theunderstanding and insights gained as a result of the research will lead to the establishment of the theory,design principles, and guidelines for building scalable QoS controls for the future Internet. This, in turn,will allow reasoned and informed choices to be made as the next generation Internet takes shape.