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Research on Wireless Internetworking and Application Support

无线互联及应用支持研究

基本信息

批准号：
10450145
负责人：
MORIKAWA Hiroyuki
金额：
$ 7.1万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

The goal of our work is to establish a networking platform in which mobile applications can be supported transparently with various wireless access technologies.(1) Development and Implementation of Wireless Internetworking TechnologyAs for wireless internetworking technology, fair scheduling algorithms were developed. In detail, Channel assignment algorithms for wireless LAN, and minimum bandwidth guaranteed scheduler were designed and implemented. We made testbed implementation by using Linux operating system.High density network architecture was also studied. In high density network, we assume tremendous number of networked devices. The nodes heterogeneity must be handled for achieving this network architecture. Toward this, we proposed stability adaptive routing and many-to-one communication protocol. These protocols were simulated by ns-2 (network simulator 2).(2) Development of Application Support Service and Making of Testbed NetworksOn-demand data prefetching system in high-speed wireless networks was developed. In such high speed networks, mobiles can stay for only short time due to the discontinuous small cells. Our method utilizes another access network for data request and high-speed network for data downloading.We made tastbed networks in which mobile hosts have two network interfaces, PHS and WaveLAN.Experimental results show our prefetching method can keep high throughput even when congestion occurs in backbone networks.

我们工作的目标是建立一个网络平台，在这个平台中，移动的应用可以透明地支持各种无线接入技术。(1)无线互联技术的发展与实现在无线互联技术中，提出了公平调度算法。详细设计并实现了无线局域网的信道分配算法和最小带宽保证调度器。采用Linux操作系统实现了实验床，并对高密度网络体系结构进行了研究。在高密度网络中，我们假设有大量的联网设备。为了实现这种网络结构，必须处理节点的异构性。为此，我们提出了稳定性自适应路由和多对一通信协议。这些协议都是通过ns-2（网络模拟器2）模拟。(2)应用支持服务的开发和试验床网络的制作开发了高速无线网络中的按需数据预取系统。在这样的高速网络中，由于不连续的小小区，移动台只能停留很短的时间。该方法利用另一个接入网进行数据请求，利用高速网络进行数据下载，在移动的主机具有PHS和WaveLAN两个网络接口的tastbed网络中进行实验，实验结果表明，该方法在骨干网拥塞时仍能保持较高的吞吐量。