A routing control for interconnected LANs under multiple transmission paths

Hansin-Awaji大地震告诉我们，使用共同目的的通信网络，如因特网，对于支持救灾活动的紧急信息的快速传递具有重要意义。我们的目标是实现一个在平时和紧急情况下都有用的灵活的多用途网络。首先，我们重点研究了通信网络的交通控制，以确保紧急信息的快速传递。本文提出了一种在对现有OSPF协议影响最小的情况下对IP中的服务质量进行路由的方案，重点研究了用于计算服务质量路由的算法以及对OSPF进行必要的修改以支持这一功能。该方案具有以下特点：(1)通过将流量分配到可能的路径路径来减少交通拥堵；(2)通过优先选择路径来确保重要流量的快速传递；考虑到防灾网络规划的框架，提出了信息网络系统的层次模型，作为构建防灾救灾通信网络的参考模型。提出的系统模型基于支持系统的人的角色，因为我们认为人对于指定网络系统的设备是必不可少的。并将该模型应用于防盗计算机网络的设计中，验证了该模型的有效性，证明了所提出的路由方案和参考模型均可广泛应用于Internet等多用途通信网。

The great Hansin-Awaji Earthquake teach us the importance of the use of common purpose communiation networks such as the Internet for supporting the quick delivery of emergent information for relief activities. Our goals are to realizaed a flexible multipurpose network which is useful on ordinary day and in the case of emergence as well.At first, we focused on the traffic control of communication networks to ensure quick delivery of emergent information for relief activities. We proposed a QoS routing scheme with the least possible impact on the existing OSPF protocol in IP.The focus of our research is on the algorithms used to compute QoS routes and on the necessary modifications to OSPF to support this function. The proposed scheme has the following features,(1) reduce traffic congestion by allocating flows to possible routes of path.(2) ensure the quick delivery of the important flows by giving them priority of route selection.We also considered the framework of network planning for disaster prevention, and proposed the hierarchical model of information network system as the referential model for constructing communication networks for dissaster prevention/relief. The proposed system model is based on the role of the people who support the systems since we believe that people are essential for specifying the equipments of the network systems. We also conseder the effectiveness of the model, applying to the desigen of the computer netwrok for dissaster prevention.We showed that both of the proposed routeing scheme and referencial model are widly applicable for oredinal multipurpose communication networks such as the Internet and so on.