Fundamental Research on Universal Ad Hoc Network

adhoc网络作为世纪的信息基础设施，有望得到发展。本研究的目的是开发一个通用的ad hoc网络，称为“通用ad hoc网络”作为下一代ad hoc网络。在一个通用的ad hoc网络中，移动的终端通过使用直接通信和多跳通信来相互通信。作为通用自组织网络的一个应用，我们提出了开放社区网络的概念。开放式社区网络是一种基于无线多跳技术的新型社区信息基础设施。作为一个开发通用ad hoc网络的案例研究，我们提出了一个新的无线局域网的概念，即无线多跳局域网（WMLAN）。我们还开发了实验系统，使用IEEE 802.11b无线局域网和PC和评估网络性能。为了开发一种发现公共节点的方法，我们提出了一种有效的分组洪泛方案，使用分簇算法和一个有效的数据包发送方法，而不使用控制包。为了开发一种高效、可靠地向公共节点传输信息的方法，提出了一种通过通信端口下载信息存储的信息访问方法。为了研究通用Ad hoc网络中信息共享的方法，我们用Gnutella开发了一个Ad hoc网络实验系统。我们还评估了Gnutella的性能。这些结果是实现通用adhoc网络的基础技术。我们今后的问题是改进WMLAN和应用程序。

Development of ad hoc networks is expected as an information infrastructure in 21st century. The objective of this research is to develop a general-purpose ad hoc network, termed "a universal ad hoc network" as a next generation ad hoc network. In a universal ad hoc network, mobile terminals communicate with each other by using a direct communication and multi-hop communication, First, we surveyed current technologies and issues in ad hoc network technologies. As an application of a universal ad hoc network, we proposed the concept of an open community network. An open community network is a novel information infrastructure for local communities based on wireless multihopping technologies. As a case study for developing a universal ad hoc network, we have proposed a novel concept of wireless LAN, that is, Wireless Multihop LAN (WMLAN). We also have developed the experimental system using IEEE 802.11b Wireless LAN and PC and evaluated the network performance. To develop a method for discovering the public node, we have proposed an efficient packet flooding scheme using clustering algorithm and an efficient packet delivering method without using control packets. To develop a method for transmitting information to the public node efficiently and certainly, we have proposed an information access method for downloading information storing Communication Port. To develop a method for sharing information in the Universal Ad hoc Network, we have developed an experimental system of ad hoc network with Gnutella. We also have evaluated the performance of Gnutella. These results are fundamental technology for realizing universal ad hoc network. Our future problems are to improve the WMLAN and applications.