基于无标度网络的应用层组播仿真

Simulation of Application Layer Multicast Based on Scale-free Network

最新的研究表明,Internet网络中节点的连接度服从幂律分布,且具有无标度(scale-free)特性。基于无标度网络模型建立的网络仿真能够更真实的反映在互联网中应用的演化特征。基于对无标度网络的研究,提出了一种基于对数关系的改进的非平稳增长模型,在此模型基础上建立了基于gossip协议的应用层组播(ALM)的模拟仿真。仿真结果表明,与常用的随机网络模型比较,提出的基于无标度网络的模型与互联网的实际情况更吻合;与Planetlab实验床试验和实际测量数据分析比较,基于无标度网络的仿真可以有效模拟大规模网络上的应用。

The latest research shows that the conjunction degree of nodes in the Internet obeys power-law distribution and has some characteristics of scale-free. The simulation based on scale-free network can reflect the evolvement of applications in the Internet more really. According to the research of scale-free network, an improved model of nonstationary growth was proposed based on logarithm relationship. On this model a simulation of ALM （application layer multicast） was built up based on the gossip protocol. The simulation result shows that comparing with the common random network model, the model put forward is more suitable with the actual circumstance of the Internet. Contrasting with the Planetlab experiment and the actual survey data, the simulation based on scale-free network can really reproduce the application of large-scale network effectively.