CAREER: Energy-Efficient Protocols for Multimedia Traffic in Ad Hoc Networks

许多商业无线应用都需要在移动、分布式、分组无线网络中支持多个服务质量(QOS)级别。在网络本身必须高度移动性和无法接入固定基站基础设施的情况下，需要移动无线电网络(或自组织网络)。为了满足可携带性和低功率操作的需求，期望单个自组织网络服务于广泛应用的业务需求，包括例如全信息多播语音、实时视频、大文件传输和交互式网络浏览。每类流量都有特定的服务要求，这些QOS级别必须由仅使用电池供电且带宽非常有限的移动和分布式网络提供。克莱姆森大学的无线通信计划已经认识到，在自组织无线网络中，不同协议层之间的强交互不仅是理想的，而且实际上是必不可少的。单个协议层不能保证业务类型的特定服务质量，但必须在路由、排队、业务调度、拥塞控制、信道接入和自适应传输协议之间进行协调。我们已经证明，通过路由协议可以有效地利用来自物理层和链路层的信息来显著提高端到端网络的性能，并降低移动无线电的总能量消耗。提出的研究和教育计划是基于我们之前的研究结果，这些结果表明，协议层之间的强耦合对于必须互连高移动性用户并可靠地将他们连接到固定基础设施的无线通信网络至关重要。这份职业规划旨在通过专注于链路和网络层的协作研究来扩展先前的成果，并通过将我们在先前工作中发现的进展应用于对网络和传输层之间相互作用的新研究来探索新的主题领域。拟议的职业生涯计划以本科生和研究生的参与为中心。这些主题的组织是为了让具有不同经验水平的学生能够做出重大贡献。研究计划的一个关键优先事项是纳入有各种职业目标的学生，并激励他们在整个职业生涯中努力实现最高水平的科学和工程卓越。计划提供大量机会，鼓励和培养有前途的本科生攻读研究生。教育计划的一个重要组成部分是将研究工具融入课堂。演示分布式协议性能的动画工具增加了我们对研究的理解，它们在课堂和实验室中将被证明同样有价值。学生将在离散事件模拟程序中实施分布式协议，并了解各种协议的性能影响，而不是简单地阅读教科书中的网络协议。

Support for multiple quality-of-service (QOS) levels in mobile, distributed, packet radionetworks is required for many commercial wireless applications. Mobile radio networks (or adhoc networks) are required in situations where the network itself must be highly mobile andwhere access to a fixed infrastructure of base stations is not available. To meet demands ofportability and low-power operation, it is desirable for a single ad hoc network to service thetraffic demands of a wide range of applications, including examples such as all-informedmulticast voice, real-time video, large file transfers, and interactive web browsing. Each class oftraffic has specific service requirements and these QOS levels must be provided from a mobileand distributed network that operates with battery power only and with very limited bandwidth. The Wireless Communications Program at Clemson University has recognized thatstrong interaction among different protocol layers in ad hoc radio networks is not only desirablebut in fact essential. A single protocol layer cannot guarantee a specific quality of service for atraffic type, but there must be coordination among the routing, queuing, traffic scheduling,congestion control, channel-access, and adaptive-transmission protocols. We have alreadydemonstrated that information from the physical and link layers can be effectively utilized by therouting protocol to dramatically improve the end-to-end network performance and reduce thetotal energy expended by the mobile radios. The proposed research and education plan is basedon our previous results that show that strong coupling among the protocol layers is vital forwireless communications networks that must interconnect highly mobile users and link themreliably to a fixed infrastructure. This career plan is structured to extend previous results throughcollaborative research that is focused on the link and network layers, and to explore a new topicarea by applying the advances discovered in our previous work to new research into theinteraction between the network and transport layers. The proposed career plan is centered on both undergraduate and graduate studentparticipation. The topics are organized so that students with a range of experience levels canmake significant contributions. A key priority of the research plan is to include students with avariety of career goals and motivate them to strive for the highest levels of scientific andengineering excellence throughout their careers. Ample opportunities are planned to encourageand develop promising undergraduate students to pursue graduate school. An importantcomponent of the educational plan is to incorporate research tools in the classroom. Animationtools that illustrate the performance of our distributed protocols have increased ourunderstanding our research and they will prove to be equally valuable in the classroom andlaboratory. Rather than simply reading about networking protocols in a textbook, students willimplement distributed protocols within a discrete event simulation program and see theperformance implications of the various protocols.