基于策略的ip网络的qos研究本科生毕业（设计）论文.docVIP

本科生毕业论文 题 目：基于策略的IP网络的QoS研究 摘 要 网络服务质量技术为多媒体的应用提供了可靠的保证，近年来已成为网络技术研究领域的一个热点问题。Diffserv 模型和MPLS模型为解决IPQoS 问题提供了有效途径，本文研究了基于Diffserv over MPLS 模型的流量控制技术。 首先，简要讨论了IP QoS 体系结构的发展，分别阐述了支持不同QoS 要求的三种网络体系结构：Intserv 模型、Diffserv 模型和MPLS模型，比较了三种网络体系结构在扩展性、鲁棒性、服务质量等方面的差异。为了提高IP QoS，在三种模型的基础之上，研究了Diffserv over MPLS 体系结构模型，对该模型的框架及实现进行了讨论，并与其它的体系结构进行了对比，分析了Diffserv over MPLS模型的技术优势。 其次，本文重点研究了流量控制技术的两个重要组成部分：列队管理和队列调度，从提高网络的扩展性和鲁棒性出发，在详细分析现有算法的基础上，提出了一种动态的列队管理算法，并对DRR 调度算法进行了改进，分别比较了改进后的算法在延迟性、抖动性和公平性等方面的优势。然后，对动态队列管理算法和改进的DRR 调度算法进行了实验仿真，实验结果表明，改进后的算法具有良好的鲁棒性，能够提高网络资源的利用率。 最后，对网络服务质量技术进行了总结，并对未来工作的几个方面作出展望，指出虽然目前已经提出了多种解决方案，但基于Diffserv over MPLS模型的流量控制还只是处于研究阶段，其相应的扩展性和鲁棒性仍需不断的改进。 关键字:网络服务质量 集成服务 区分服务 多协议标签交换 Abstract Quality of Service provides a reliable guarantee for the application of multimedia, and becomes a hot spot in the research of networks recently. Two models about Differentiated Service and Multi-protocol Label Switching supply an available route to sesolve the question of IPQoS, the technique of traffic control based on Diffserv over MPLS is studied in this paper. Firstly ,the development of IP QoS architecture is briefly discussed, and three kinds of architectures: Intserv, Diffserv and MPLS are demonstrated respectively, then the difference of them is compared in expandability, robustness and QoS. In order to improve IP QoS, the architecture of Diffserv over MPLS is researched on the basis of three models, in addition, framework and implementation about it are discussed, and in contrast to the others, the advantages of Diffserv over MPLS are analyzed. Secondly, after deeply analyzing current algorithms, the paper concentrates on technique of traffic control which includes queue management and scheduling, a dynamic queue management algorithm is proposed to enhance their expansibility and robustness, and the DRR scheduling algorithm is also improved. Comparing with other existing algorithms, their benefit in latency, jitter and fairnes