Wireless Technology: Seamless Multitier Wireless Networks for Multimedia Applications

无线技术：用于多媒体应用的无缝多层无线网络

• 批准号: 9979465
• 负责人: Behnaam Aazhang
• 金额: $ 70万
• 依托单位: William Marsh Rice University
• 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: 1999-10-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9979465&HistoricalAwards=false
• 关键词: Wireless; Technology; Seamless; Multitier; Networks

In the past decade, the number of subscribers to mobile and wireless communication services has grown at an exponential rate. Concurrently, emerging wireless devices have enabled new modes of communication beyond traditional cellular voice. However, to remain continually "connected," users face the frustrating task of manually coordinating a vast disarray of services, devices, and wireless technologies.The goal of this project is to develop a platform for truly seamless communication throughout environments as fundamentally different as high-speed indoor wireless and conventional cellular systems. The investigators propose to design, build, and evaluate RENE (Rice Everywhere NEtwork), a multi-tier system that provides network- and application-level services using a single network interface card. The key innovations of the RENE project are as follows:1. The design of an mNIC (multi-tier Network Interface Card), a novel network interface card that is reprogrammable on-the-fly to different physical- and network-layer standards. The mNIC will support soft handoffs, both horizontally within a tier and vertically among tiers, including transitions from a prototype 100 Mbps indoor wireless LAN protocol to commercial CDMA cellular standards.2. The building of a proxy file system that enables seamless and consistent access to a user's home working environment, independent of the user's location or available network resources. The system will respond to changes in available capacity using transcoders, allow consistent reading and writing of files (even when transcoded), and facilitate network-awareness in unmodified applications.3. The investigators will perform an extensive measurement and modeling study of proxy traffic using multi-fractal models. Using these results, policies will be devised which enable the proxy to make intelligent decisions on when and to what extent to transcode or store user data to best meet user performance objectives.4. The development of a new coarse-grained approach to resource reservation and admission control that enables users to obtain predictable performance in multi-tier environments. The key technique is to abstract system resources into networks of virtual bottleneck cells such that by provisioning resources in the virtual cells, quality of service objectives can be satisfied in the actual system.This research will be conducted in collaboration with Nokia and Texas Instruments in order to build a complete prototype implementation of the RENE system and demonstrate its capabilities.

在过去十年中，移动和无线通信服务的用户数量呈指数级增长。 与此同时，新兴的无线设备已经实现了传统蜂窝语音之外的新通信模式。 然而，为了保持持续的“连接”，用户面临着手动协调大量混乱的服务、设备和无线技术的令人沮丧的任务。该项目的目标是开发一个平台，在与高速室内无线和传统蜂窝系统根本不同的环境中实现真正的无缝通信。研究人员建议设计、构建和评估 RENE（Rice Everywhere NETwork），这是一个使用单个网络接口卡提供网络和应用程序级服务的多层系统。 RENE项目的主要创新点如下： 1． mNIC（多层网络接口卡）的设计，这是一种新型网络接口卡，可根据不同的物理层和网络层标准即时重新编程。 mNIC 将支持层内水平软切换和层间垂直软切换，包括从原型 100 Mbps 室内无线 LAN 协议到商业 CDMA 蜂窝标准的过渡。2。构建代理文件系统，能够无缝、一致地访问用户的家庭工作环境，而与用户的位置或可用的网络资源无关。 该系统将使用转码器响应可用容量的变化，允许一致地读写文件（即使在转码时），并促进未修改的应用程序中的网络感知。3。研究人员将使用多重分形模型对代理流量进行广泛的测量和建模研究。 使用这些结果，将设计策略，使代理能够就何时以及在多大程度上转码或存储用户数据做出明智的决策，以最好地满足用户性能目标。4。开发一种新的粗粒度资源预留和准入控制方法，使用户能够在多层环境中获得可预测的性能。 关键技术是将系统资源抽象到虚拟瓶颈小区网络中，通过在虚拟小区中配置资源，可以在实际系统中满足服务质量目标。这项研究将与诺基亚和德州仪器合作进行，以构建 RENE 系统的完整原型实现并展示其功能。