TCP批量业务的自相似特性  

The Self-similarity of the TCP's Bulk Traffic

作　　者：刘向东[1] 张俊星[1] 张金海[2] 刘勇奎[1] 

机构地区：[1]大连民族学院非线性信息技术研究所,辽宁大连116600 [2]辽宁科技大学理学院,辽宁鞍山114004

出　　处：《微电子学与计算机》2008年第5期30-34,共5页Microelectronics & Computer

基　　金：国家自然科学基金项目(60573124);辽宁省自然科学基金项目(20040948)

摘　　要：通过对简单网络拓扑结构下不同参数TCP批量传输实测流量数据的统计分析,研究了TCP批量稳定流量的自相似特性.分析结果表明,在10BaseT环境下,TCP批量传输的流量比较稳定,没有明显的突发性与自相似特性.而在100BaseTx环境下,TCP批量传输的流量表现出明显的突发性与自相似性,其自相似性强弱程度与通信方式、网卡缓存大小密切相关.同样条件,全双工TCP流自相似强度大于半双工流;而网卡缓存越少,TCP流突发性与自相似性越强.This paper analyzed the actual TCP＇s bulk traffic in simple topological network with different parameters statistically, studied the self-similarity of their stable flow. The analysis results indicated that, in the 10BaseT networks, the TCP＇s bulk traffic is quite stable, does not present the burst character and the self-similarity obviously. But in the 100BaseTx networks, the TCP＇s bulk traffic presents the burst character and the similarity obviously, its ,self-similarity degree closely correlates to the communication patterns and the buffer size of the network interface cards. Under the similar condition, the self-slmilarity of the full-duplex TCP＇ s bulk flows is stronger than its of the half-duplex TCP＇ s bulk flows, meanwhile, the less buffer the network interface card has, the stronger self-similarity and burst the TCP＇s bulk traffic presents.

关 键 词：TCP流 自相似性 方差-时间图 HURST参数 

分 类 号：TP393.07[自动化与计算机技术—计算机应用技术]