A Study on Multimedia Communication Software for Intelligent Transportation Systems

智能交通系统(ITS)得到了广泛的研究。ITS的目标是解决交通拥堵、交通事故等几个问题以及汽车导航。此外，旨在构建以车辆为中心的高度信息社会的远程信息处理。在这些研究中，必须从根本上研究多媒体的软件和通信方案。在这一年，也就是本项目的最后一年，我们进行了以下研究：(1)自组织网络的路由方案研究我们将中继站和车辆之间的网络看作一个自组织网络，因此，我们研究了有效的自组织网络的路由方案。也就是说，我们提出了一种能量感知的路由方案和一种高可靠性的路由方案，并通过仿真实验证明了这些方案是有效的。(2)无线自组网位置估计系统的研究并不是所有的移动计算机都有GPS。一些移动计算机可能是GPS，也可能不是。在这种情况下，如果一台移动计算机获得了自己的位置，使用该计算机的应用领域可以得到极大的扩展。在此背景下，我们提出了一种位置估计方案，允许没有GPS的移动计算机通过与有GPS的移动计算机进行通信来获得自己的位置信息。此外，通过仿真实验验证了该方案的有效性。

Intelligent Transportation Systems, ITS, are widely studied. The aim of ITS is to resolve several problems such as traffic congestion, traffic accidents, and so on as well as car navigation. In addition, telematics that aims at constructing high information society where vehicles play a central role. In these studies, software and communication schemes for multimedia must be essentially studied. In this year, the final year of this project, we performed the following studies.(1)Studies on routing schemes for ad-hoc networksWe considered a network between relay stations and vehicles as an ad-hoc network.Therefore, we studied effective routing schemes for ad-hoc networks. That is, we proposed a power aware routing scheme and a routing one with high reliability.We showed that these routing schemes effectively worked through simulation experiments.(2)Studies on location estimation systems for wireless ad-hoc networksNot all mobile computers have GPSs. Some mobile computers may GPSs or not. In this situation, if a mobile computer gets own location, application fields using the computers can be drastically extended. Under this background, we proposed a location estimation scheme that allows a mobile computer without a GPS to get own location information by communicating it with a mobile computer with a GPS. In addition, we showed the proposed scheme effectively works through simulation experiments.