ITR: Cross-Layer Design of Ad-Hoc Wireless Networks for Real-Time Media

ITR：实时媒体自组织无线网络的跨层设计

• 批准号: 0325639
• 负责人: Andrea Goldsmith
• 金额: $ 75万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-10-01 至 2008-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0325639&HistoricalAwards=false
• 关键词: ITR; Cross; Layer; Design; Ad

ABSTRACT0325639Goldsmith, AndreaStanford UniversityAn ad-hoc wireless network is a collection of possibly mobile wireless nodes that self-configure to form anetwork without the aid of any established infrastructure. The lack of infrastructure is extremely compellingfor applications where a communications infrastructure is too expensive to deploy, cannot be deployedquickly, or is simply not feasible. Such applications range from multi-hop wireless broadband Internetaccess to sensor networks to building or highway automation to voice, image, and video communication foremergency response, a life-saving capability urgently needed by our society. The nature of ad-hoc wirelessnetworks makes support of delay-critical applications such as voice and video quite challenging. In thisproject the investigators study a new framework for ad-hoc wireless network design to support such delay-critical applications. The framework includes dynamic allocation of network resources to support mediarequirements, protocols that are robust to variations and uncertainties in the network, and adaptive mediacompression techniques that preserve end-to-end network connectivity even when network conditions arepoor. The results of the project are expected to have a significant impact on the development of futurewireless networks and the enabling of critical applications.The framework being developed to support delay-critical applications in ad-hoc wireless networks is basedon cross-layer design across the network protocol stack. The design incorporates adaptation across multipleprotocol layers, including the application, transport, network, and link layers. Within this framework, theinvestigators develop a suite of new techniques to balance network congestion and distortion of real-timemedia streams by jointly optimizing error-resilient source coding, packet scheduling, stream-based routing, link capacity assignment, and adaptive link layer techniques. The optimization is carried out dynamically by all nodes, based on link state communication, to continuously adapt to changing link and trac conditions.The research project systematically investigates these new ideas and ultimately demonstrates them in a smalltestbed.

Abstract0325639Goldsmith，Andreastanford Universityan Ad-Hoc无线网络是可能的移动无线节点的集合，可以自我配置在没有任何既定基础架构的情况下形成挑战。缺乏基础架构是非常引人注目的应用程序，因为通信基础架构太昂贵，无法部署，无法进行部署或根本不可行。此类应用程序范围从多跳无线宽带互联网到传感器网络到建筑物或高速公路自动化，再到语音，图像和视频通信范围响应，这是我们社会迫切需要的挽救生命的能力。临时无线网络的性质可以支持延迟关键应用，例如语音和视频挑战。在此项目中，研究人员研究了一个新的无线网络设计框架，以支持此类关键延迟应用。该框架包括网络资源的动态分配，以支持媒体呼吁，对网络中的变化和不确定性具有鲁棒性的协议以及自适应媒体压制技术，即使网络条件是po，它们也可以保留端到端网络连接。预计该项目的结果将对未来无线网络的开发和启用关键应用程序产生重大影响。开发的框架是为了支持临时无线网络中的延迟至关重要的应用程序，是整个网络协议堆栈中的跨层设计。该设计结合了多个协议层的适应性，包括应用，传输，网络和链接层。在此框架内，通过共同优化了错误的源源编码，数据包调度，基于流的路由，链路容量分配和自适应链路层技术，介绍者开发了一系列新技术，以平衡实时流的网络拥堵和扭曲。基于链接状态通信的所有节点都动态地进行了优化，以不断适应不断变化的链接和TRAC条件。