A Study on Wireless Agent Communication Systems

本研究已解决在实现无线代理通信系统，它使用虚拟无线电自由空间网络与微波光子技术，并能够提供使用为中心的无线电网络资源的控制。（1）微波光子学虚拟无线电自由空间网络提出了混沌扩频编码方法和混沌路由方法在直接光开关CDM的RoF网络中实现多个无线电空间的复用和传输，并从实验和理论上研究了它们对无线电信号传输质量的改善作用。此外，已经提出并检验了用于RoF网络的非线性补偿的光学FM方法和用于异构无线电服务的透明传输的毫米波无线电上无线电网络。（2）无线代理为了实现无线代理在第七层根据用户的需求和情况对无线资源进行以用户为中心的最优控制，我们提出了一种与服务内容、用户停留时间和无线信道质量相适应的无线资源管理方法，并开发了一个用于以用户为中心的无线媒体选择的SIP协议栈。我们已经成功地演示了不同的空中接口（PHS和WLAN）的无线IP系统的终端之间的语音通信。（3）多维用户效用函数根据主观MOS实验的结果，我们导出了一种新的二维用户效用函数，它代表了用户对电影下载服务的等待时间和图像质量的满意度。最后，我们开始构建一个测试床来实际检验所提出的无线代理通信系统。

This study has been addressed in the realization of Wireless Agent Communication systems, which uses virtual radio free space networks with microwave photonics technologies, and is able to provide the use-centric control of radio network resources. Followings are obtained as results :(1)Microwave Photonics Virtual Radio Free Space NetworksWe have proposed Chaotic spreading coding method and also Chaotic routing method to multiplex and transfer several radio spaces in RoF network with direct optical switching CDM, and experimentally and theoretically investigated their improvement effect in the transmission qualities of radio signals. Furthermore, optical FM method for nonlinear compensation for RoF networks, and millimeter -wave Radio-on-Radio networks for the transparent transfer of heterogeneous radio services have been proposed and examined.(2)Wireless AgentsIn order to realize wireless agents performing the optimum user centric control of radio resources according to users' demand and situations at Layer 7, we have proposed a radio resource management method operating adaptively with service contents, users' dwell time, and wireless channel quality, and also developed a SIP stack for user centric wireless media selection. We have successfully demonstrated voice communication among terminals with different air interfaces (PHS and WLAN) on the Wireless over IP system.(3)Multi dimensional User Utility FunctionsFrom results of subjective MOS experiments, we have derived a new type of two -dimension user utility function, which represent the user satisfaction for the waiting time and the picture quality for movie download services.Finally, we have started to construct a test bed to examine practically the proposed wireless agent communication system.