Research on QoS and traffic congestion control schemes in IP network

在IP网络中，实时交互式语音通信业务的实用性日益提高。然而，针对这类端到端服务的通信行为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进行了以下两项研究。基于用户行为的流量模型提出了考虑用户满意度的服务模型及其评价能够在不降低语音质量的情况下完成所接受业务的流量控制方案，即保持“质量满意的完成呼叫”。本文以以下两个问题为研究对象。(1)以有效提高用户个人满意度为目标，采用混合型线路预留法的优先信道分配方案。提出了适用于CDMA和TDMA两种移动蜂窝网络系统的优先连接业务控制方案。此服务是基于用户强烈希望在通话期间避免断开连接的声明。该服务仅为需要高质量连接的用户提供。使用东京一个真实城镇的交通模型来评估基本性能。(2) VoIP网络的呼叫级QoS改进技术及其系统配置。提出了一种以基于生成流量强度的公平性为规则的控制方案，称为“基于呼叫发起率的公平性”，并对主要性能进行了评价。下一步讨论一个有效的电路资源管理系统已经发展成一个新的优先连接控制方案的建议，称为“质量资源预留方案”。结果表明，采用该方案可以达到保持和稳定交替路由网络吞吐量的效果，并提出了一种用于控制职业规模VoIP网络的系统配置。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