Development of Layered Organization Technology for Breadbard Integrated Service Digital Network

分层网络结构适用于宽带ISDN，它以唯一的网络接口支持各种业务。分层网络由超高速广域网、高速城域网和局域网构成。本计画的目的是发展B-ISDN的分层组织技术，具体有以下三个研究主题：1。高速传输技术，2。不同层次之间的互联互通技术;交通控制技术。在本计画的最后一年，我们将研究目标定在各层网路的效能提升及不同层网路的互连技术发展上。以下是本年度业绩的详细情况。我们开发了互连网络系统、互连超高速广域网和高速城域网的网络模拟器，该模拟器用于对下面描述的网络控制方案进行性能评估.我们提出了一个新的R ...更多信息 广播交通的出行计划。该方案避免了数据包复制操作集中在连接源站和接收站的树形路径的中间交换节点.提出了一种新的路由方案，适用于对服务等级要求不同的多种业务。该方案对每种业务使用不同的代价函数.提出了一种新的环网接入控制方案，该方案在可分辨竞争环方案中引入了优先级函数。仿真结果表明，该方案可以通过改变业务的优先级参数来调整业务的性能，适用于多媒体环境.我们分析了DQDB，并提出了一个主要的改进，照顾站之间的公平性。针对互连网络的流量控制问题，提出了一种新的ATM网与FDDI网之间的网关控制方案。该方案是反馈型拥塞控制，并基于FDDI传输单元，帧。仿真结果表明，该方案在ATM网络内部和接收网关处均无信元丢失。少

Layered network organization is suitable for Broadband ISDN which support various traffic with a unique network interface. The layered network is constructed with very high speed WAN, high speed MAN and LAN. The purpose of this project is a development of layered organization technology for B-ISDN and concretely has three research themes as follows ; 1. High-speed transmission technology, 2. Interconnection and internetwork technology between different layers, 3. Traffic control technology. In the last year of this project, we settled the research purpose at the performance improvement of each network and the development of interconnection technology for different layered networks. The following shows the detail of the results of this year.1. We developed the network simulators for interconnection network system, interconnected very high-speed WAN and high-speed MAN. The simulator was used for the performance evaluation for network control schemes described below.2. We proposed a new r … More outing scheme for broadcasting traffic. The scheme avoids the concentration of packet copy operation in intermediate switching nodes of tree shaped path which connects a source station and receiving stations.3. We proposed a new routing scheme for many kinds of traffic which requires different grade of service. This scheme uses different cost function for each traffic.4. We proposed a new access control scheme for ring networks, which introduces priority function to Resolvable Contention Ring scheme. Simulation results showed the scheme is suitable for multi-media environment because it can adjust the performance of each traffic by changing its priority parameter.5. We analyzed DQDB and suggested a major improvement taking care of fairness among stations.6. For the traffic control for interconnection networks, we proposed a new scheme for gateways which connect ATM networks and FDDI networks. The scheme is feedback type congestion control and is based on a FDDI transmission unit, a frame. The simulation results showed that the scheme leads no cell loss both inside an ATM network and at a receiving gateway. Less