Reliable Multimedia Information Netwrork based on Real-time Distributed Cooperative Control

近年来，基于光网ADSL、FTTH等的高速骨干网和宽带接入网都得到了发展。相反，IP网络仍然只提供尽力而为的服务。为了实现舒适的多媒体业务，我们尝试构建一个基于实时分布式协同控制的可靠多媒体信息网络。在本研究中，我们取得了以下两个主要成果：(1)基于高速分布式控制的可靠光网络我们研究了光网络上的高效自愈技术和路由方法，以达到保证服务质量和高效链路使用的目的。因此，我们提出通过使用独占的备用路径来提高光网络的可靠性。基于代理技术的实时分布式协作为了在全网范围内进行有效的分布式管理，提出了一种即使在异质计算环境下也基于代理执行时间近似估计的高效代理控制方法。此外，我们还提出了一种多智能体系统的调度算法，通过多智能体之间的通信来缩短智能体的周转时间。

In recent years, both of high-speed backbone network and broad-band access networks have been developed based on photonic networking ADSL, FTTH and so on. To the contrary, IP network still provides just best-effort services. To realize comfortable multimedia services, we have tried to construct a reliable multimedia information network based on real-time distributed cooperative control.In this research, we have got the following two major results.(1) Reliable photonic network based on high-speed distributed controlWe studied on the efficient selfhealing technology and the routing method on a photonic network to achieve QoS guarantee and efficient link usage. As a result, we proposed to enhance the reliability of the photonic network by using exclusive alternate paths. In addition, we proposed a new routing method which constructs effective wavelength paths based on autonomous decentralized control without global information.(2) Real-lime distributed cooperation based on agent technologyFor effective distributed management all over the network, we proposed an efficient agent control method based on approximate estimation of execution time of agents even on a heterogeneous computing environment. Moreover, we also proposed a scheduling algorithm for multi-agent systems to shorten the turn around time of agents by inter-agent communications.