The Multimedia Communication Architecture in the Ubiquitous Computing Environment

无处不在的计算环境中，它将充满看不见的计算机嵌入在我们周围的每一件事，并通过高度发达的网络相互连接，这将是一个理想的通信环境，我们将能够在任何时间，任何地方，与任何人进行通信。从通信的角度来看，这是一个普适的通信环境，我们研究了普适计算环境或普适通信环境下的多媒体通信体系结构，主要研究成果有以下三点：1.提出了一种非对称区域系统，该系统利用大区域和极小区域，大区域用于发现携带卡片式应答器在服务区域内移动的个人的位置，极小区域用于响应发起者，大区域的基站广播发现个人，他携带的应答器响应极小区域的另一个基站。从而解决了现有小区系统中存在的隐私问题.提出了位置信息代理体系结构LIBRA。LIBRA是一种新的位置感知服务体系结构，在LIBRA中，位置信息代理收集和组合来自多个传感器系统的位置信息，以提高位置信息的可靠性，并以通用格式存储精确的位置信息，每个应用程序与用户代理和位置信息代理进行协商，以获得其服务所需的精确位置信息.本文报告了根据个人位置识别系统的位置信息，利用ISDN D信道能力切换通信连接路径的一些实验结果。

The ubiquitous computing environment where it will be filled with unseen computers embedded in every things around us and connected each other with highly developed networks will be an ideal communication environment where we will be able to communicate at any time, from anywhere, and with anybody. From the communication point of view, it is the ubiquitous communication environment.We have investigated the architecture for multimedia communication in ubiquitous computing environment or ubiquitous communication environment.The major result of the project are the following three points.1. An asymmetrical zone system using large zones for finding location of individuals carring card style transponder moving in the service area and extremely small zones for responding to the originator is proposed.A base sation of a large zone broadcasts to find an individual and the transponder carried by him responds to another base station of a extremely small zone. Therefore, The privacy problems in exiting small zone system is soleved.2. The Location information broker architecture, abbreviated to LIBRA,is proposed. LIBRA is a new system architecture for location aware services.In LIBRA,the location information broker gathers and combines location informations to improve reliability of those from several sensoring systems and stores accurate location information in a common format.Each application negotiates with the agents of users and the location information broker to get the accurate location information needed for its services.3. Some experiment results of switching communication connection path using ISDN D-channel capabilities based on location information from an individual location recognition system are reported.