全源NT技术的接入网链路丢包率推断  

Research on access network link loss rate inference of full source network tomography

作　　者：段琪[1] 蔡皖东[1] 田广利[1] 

机构地区：[1]西北工业大学计算机学院,陕西西安710072

出　　处：《哈尔滨工程大学学报》2011年第4期451-457,共7页Journal of Harbin Engineering University

基　　金：国家863计划资助项目(2009AA01Z424);教育部博士点基金资助项目(200806990030)

摘　　要：针对接入网链路丢包率具有非对称性,单源和多源的NT技术只能推断单向链路性能的问题,提出全源NT的测量模式,研究了基于全源NT的链路丢包率估计技术.提出了将全源网络结构转化为可辨识网络结构的方法,并给出采用EM算法和MCMC算法的链路丢包率估计方法.仿真实验表明该推断方法是有效的.The link loss rate of access network has asymmetry.However,single and multiple source network tomography can only infer the link performance of one direction.Therefore,a full source measurement pattern was proposed and link loss rate inference technology based on full source network tomography was researched in this paper.A method of transforming the full source network to the identifiable network was proposed.Furthermore,the EM algorithm and the MCMC algorithm which infer the link loss rate were derived,and their effectiveness was validated by simulation results.

关 键 词：NT 链路丢包率 链路性能推断 EM算法 MCMC算法 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]