基于网络演算的改进QoS模型研究

On Improved QoS Model Based on Network Calculus

通过对当前IP网络中常用QoS模型,特别是集成服务和区分服务模型的分析,指出其在下一代互联网应用环境中存在的不足.运用有利于量化计算的网络演算理论,结合IPv6的特性和流标签、优先级域等优势,提出了一种改进的QoS模型——RSM模型,并通过与集成服务和区分服务模型进行对比分析和实例计算,证实了RSM模型在大规模IP网络中也具有较好的端到端延迟边界和较低的丢包率,其分域管理的特点保证了良好的扩展性.

By analyzing the QoS models of current IP network,especially IntServ Model and DiffServ Mod-el,the deficiency in the application environment of the next generation network has been pointed out. Combining with the advantages such as flow label,Priority and TC field in IPv6,an improved QoS model-RSM model has been proposed with the application of the network calculus theory which is beneficial to calculation.In comparison with the IntServ and DiffServ models,and after the analysis and demonstration calculations,the fact that the RSM model can get a better guarantee of End-to-End delay and a lower rate of packets lost is proved even in a large IP network,and the good scalability is obtained by the features of domain split management.