基于RED-marking队列管理策略的TCP/IP网络仿真

A Novel Modeling Method for Analysis of IP Networks

提出一种新的建模方法用以分析现实中的IP网络。该方法将实际的网络系统分解为各个独立的基本单元,通过建立基本单元的状态方程来构造整个网络系统的数学解析模型。借鉴Bohacek等人的研究成果,将路由器输出端口的缓存队列用一个一阶微分方程来进行建模,在不影响仿真模型精确性的前提下,显著降低了仿真系统的复杂性;针对路由器的队列管理,在建模中采用了带标记的随机早期检测(RED-marking)策略。最后,我们构造了一个简单网络的数学模型,同时将该数学模型与NetworkSimulator(NS)的仿真结果进行了对比,验证了该模型的正确性。

A novel modeling method is proposed to analyze actual IP networks. This method decomposes an IP network into several basic units and constructs the mathematical model of the network by setting up the corresponding state equation for every unit. Based on the Bohacek's model, we develop a first-order differential equation to describe queue change in an output port of a router, which reduces system complexity obviously without sacrificing simulation precision. The RED-marking strategy is introduced for the queue management of routers. Finally, we build a mathematical model for a simplified network. The model is well validated by comparing its analytical results with the NS simulation results.