WIRELESS TECHNOLOGY: Coordinated Fast Adaptation in Wireless Systems

无线技术：无线系统中的协调快速适应

• 批准号: 9979438
• 负责人: Richard Schlichting
• 金额: $ 63.6万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9979438&HistoricalAwards=false
• 关键词: WIRELESS; TECHNOLOGY; Coordinated; Fast; Adaptation

The technological improvements will dramatically change the nature of wireless systems over the next ten years. Not only will more devices of increasingly diverse types compete for wireless media, but new applications based on wireless technology will also make more intensive use of this scarce resource, with strict requirements for Quality of Service (QoS) attributes such as throughput, security, and reliability. Despite technological advances, however, certain key features of wireless systems are expected to remain unchanged. For instance, wireless systems will continue to operate in an exceptionally dynamic execution environment in which bandwidth and other resources can vary significantly over time. The diversity of available resources (e.g., power, CPU speed, memory, transmission power and bandwidth) at the wireless devices and the wired base stations will also undoubtedly persist. This project proposes a wireless architecture that uses fine-grain configurability and fast coordinated adaptation as fundamental cornerstones for providing QoS for applications in such a diverse and dynamically changing environment. Fine-grain configurability allows the software on each device to be customized to the characteristics of that device, the executing application, and the current execution environment, while fast coordinated adaptation allows the configuration to be changed dynamically at runtime. Unlike current efforts, the focus on adaptability is on coordination across multiple layers and among multiple devices to support more global optimizations and the need for dramatic changes in the networking software. The latter could be used, for example, in a natural disaster to alter the network routing protocols used by affected wireless systems to compensate for the loss of fixed base stations.The starting point for this work is Cactus, a system for constructing highly-configurable network protocols and other services from fine-grain software modules that interact using an event-driven execution paradigm. Cactus will provide the implementation framework for the various components on different system layers, ranging from device drivers to applications, as well as the basis for realizing the adaptive behavior within each component. The proposed wireless architecture also adds new system components that coordinate adaptations across different system layers and different devices in a wireless network. The overall architecture offers a platform where a system is constructed of highly adaptive system layers and the adaptations of different layers are optimized locally for the specific requirements of each application and globally to meet broader system requirements. Thus, it has the potential to serve as a good platform for new wireless applications with strict QoS requirements. The goals of the proposed research include the design of the overall system architecture, development of adaptation mechanisms, construction of example adaptive protocols, investigation of adaptation and coordination policies, and experimental validation. Two different prototyping environments will be used. The first is an existing cluster of 64 Pentium PCs, where wireless communication is simulated over a wired 100 Mb Ethernet. This platform makes it easy to experiment with issues such as failures of base stations, location-aware protocols, and vertical handoffs between different wireless networking solutions. The second testbed is a collection of portable PCs with a selection of different wireless networking hardware and GPS receivers for location-aware computing.

技术的进步将在未来十年内极大地改变无线系统的性质。 不仅将有越来越多类型的设备竞争无线媒体，而且基于无线技术的新应用也将更加密集地使用这一稀缺资源，对服务质量（QoS）属性（如吞吐量、安全性和可靠性）有严格的要求。 然而，尽管技术进步，无线系统的某些关键特征预计将保持不变。 例如，无线系统将继续在异常动态的执行环境中操作，其中带宽和其他资源可以随时间显著变化。 可用资源的多样性（例如，功率、CPU速度、存储器、传输功率和带宽）在无线设备和有线基站处的性能也将毫无疑问地持续。 该项目提出了一种无线架构，使用细粒度的可配置性和快速协调的适应作为基本的基石，在这样一个多样化的和动态变化的环境中提供QoS的应用程序。 细粒度可配置性允许每个设备上的软件根据该设备、执行应用程序和当前执行环境的特性进行定制，而快速协调自适应允许在运行时动态更改配置。 与目前的努力不同，适应性的重点是跨多个层和多个设备之间的协调，以支持更多的全局优化和对网络软件的巨大变化的需求。 后者可以用于，例如，在自然灾害中，改变受影响的无线系统使用的网络路由协议，以补偿固定基站的损失。这项工作的起点是Cactus，一个用于构建高度可配置的网络协议和其他服务的系统，这些协议和服务来自使用事件驱动执行范例进行交互的细粒度软件模块。 Cactus将为不同系统层上的各种组件提供实现框架，从设备驱动程序到应用程序，以及实现每个组件内自适应行为的基础。 所提出的无线架构还增加了新的系统组件，这些组件协调无线网络中不同系统层和不同设备之间的适配。 整体架构提供了一个平台，其中系统由高度自适应的系统层构成，并且不同层的适应性针对每个应用程序的特定要求进行了本地优化，并在全球范围内满足更广泛的系统要求。 因此，它有潜力成为具有严格QoS要求的新无线应用的良好平台。建议的研究的目标包括设计的整体系统架构，适应机制的发展，建设的例子自适应协议，调查的适应和协调政策，和实验验证。 将使用两种不同的原型环境。第一个是现有的64台Pentium PC集群，其中无线通信通过有线100 Mb以太网进行模拟。 该平台可以轻松地试验基站故障、位置感知协议以及不同无线网络解决方案之间的垂直干扰等问题。第二个测试平台是一系列便携式PC，它们具有不同的无线网络硬件和GPS接收器，用于位置感知计算。