Research on QoS and traffic congestion control schemes in IP network

实时交互式语音通信业务在IP网络中的实用化程度越来越高。然而，对这种端到端服务的通信行为所引起的流量控制机制的研究还处于起步阶段。本研究针对端到端IP网络和蜂窝网络的移动通信业务，提出了一种考虑用户满意度的业务模型，并利用基于用户行为的话务模型对其进行了评价。2.在不降低话音质量的前提下，实现业务完成的业务控制方案，即保持“质量满意的完成呼叫”这两个问题进行了研究。(1)基于混合型电路预留方法的优先信道分配方案，其目的是有效地提高个人用户的满意度。可应用于两种…的优先连接业务的控制方案更多的是码分多址和时分多址移动蜂窝网络系统。该服务基于强烈希望在其呼叫持续时间内避免断开连接的用户的声明。仅为需要高质量连接的用户提供适当的服务。(2)基于VoIP网络的呼叫级服务质量改进技术及其系统配置，提出了一种基于产生流量强度的公平性准则--呼叫始发率导向公平性控制方案，并对其主要性能进行了评价。接下来对有效的电路资源管理系统的讨论已经发展成一种新的优先级连接控制方案的建议，该方案被称为“质量资源预留方案”。结果表明，该方案达到了保持和稳定交替路由网络吞吐量的效果，并提出了一种控制业务规模VoIP网络的系统结构。较少

The practicality of the real-time interactive vocal communication service has risen in IP network. However, researches on the control mechanism of traffic caused by the communication behavior concerning this kind of end-to-end service are still at an initial stage. This research aimed at the following two items for the end-to-end IP networks and the mobile communication service with cellular networks.1.Proposal of service model that considers user satisfaction and its evaluation using traffic model based on user behavior.2.Traffic control schemes which can realize completion of the accepted service without voice quality deterioration, that is, maintaining "Quality Satisfied Completion Calls"The following two problems were investigated as research subjects.(1)Priority channel assignment schemes by using hybrid type circuit reservation method which aims at effective improvement of individual user satisfaction.Control schemes of the priority connection service which can be applied to both … More the CDMA and TDMA mobile cellular network system. This service is based on a declaration from user who strongly desire to avoid disconnection in his call duration. The service is adequately provided only for the user requiring high quality connection. Basic performances are evaluated using traffic model of a real town in Tokyo.(2)Call level QoS improvement technology and its system configuration for VoIP networks.A control scheme of which the rule was the fairness based on generated traffic intensity, called "Call originate Rate Oriented Fairness" was proposed and the principal performances are evaluated. Next discussion for an efficient circuit resource management system has developed into a proposal of a new priority connection control schemes called "Quality resource reservation scheme". It was shown to achieve the effect of keeping and stabilizing the throughput of the alternating routing network by using this scheme, and a system configuration for controlling career scale VoIP networks was proposed. Less