光突发交换边缘结点汇聚机制对业务流自相似特性的影响  

Impact of convergence mechanism on self-similarity of traffic in edge nodes of optical burst switching

作　　者：刘建平[1] 刘增基[1] 文爱军[1] 

机构地区：[1]西安电子科技大学综合业务网与关键技术国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2005年第6期852-855,共4页Journal of Xidian University

基　　金：国家自然科学基金重大研究计划面上项目资助(90104012)

摘　　要：在分析光突发交换(OBS)边缘结点汇聚机制的基础上,提出了一种基于方差时间图的分析方法,利用“时间离散”和“尺度聚集”的思想,通过构造不同聚集级别m的聚集序列,分析得出业务流时间聚集序列的方差渐近性,从理论上证明了在组装器队长具有有限二阶矩的条件下,汇聚机制的分解、组装和合并过程不会改变业务流的Hurst参数.同时利用Opnet建立了OBS网络边缘结点的仿真模型,并通过仿真试验验证了理论分析的正确性.理论分析和仿真结果表明边缘结点汇聚输出的突发流与输入分组流具有相同的自相似特性,与所采用的组装算法无关.Optical burst switching （OBS） is a promising paradigm of the next-generation internet infrastructure. In this paper a variance-time-based analysis method is proposed, based on the analysis of the convergence mechanism in the OBS edge node. By sampling from the traffic flow and averaging non-overlapping blocks of size m from the original series, the variance asymptotic characteristic of the averaged series is obtained, from which this method shows that the splitting, assembling and merging process of the convergence mechanism will not change the Hurst parmeter of the traffic if the queue length of assemble buffer has a finite second-order moment. A simulation model of the OBS edge node is established, on which the correctness of analysis is testified. From both theoretical and simulation results, it is demonstrated that the self-similarity of the traffic after convergence is the same as that of the input traffic and has nothing to do with the assemble algorithm.

关 键 词：光突发交换 突发汇聚 自相似业务 

分 类 号：TN929.11[电子电信—通信与信息系统]