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1、第33卷第6期铁道学报Vol.33No.62011年6月JOURNALOFTHECHINARAILWAYSOCIETYJune2011文章编号:1001-8360(2011)06-0041-07无线Mesh网络路由器节点业务量建模与性能分析李志杰,方旭明(西南交通大学信息科学与技术学院,四川成都610031)摘要:路由器节点承载WMNs(WirelessMeshNetworks)的主要业务,决定网络的整体性能,其业务性能建模与分析是当前研究的热点内容。本文基于802.11OFDM物理层计算的分组平均服务时间,采用排队论分析WMN路由器节点业务性能的理论模型,给出节点业务性能的计算方法,通过理
2、论分析与仿真验证模型的准确性,并给出使用归一化的模型参数的简化计算方法。分析表明,在相对稳定的网络环境中,路由器节点的性能与业务到达模型相关,需要采用不同的模型和方法分析VBR(VariableBitRate)和CBR(ConstantBitRate)业务的性能;在动态的网络中,节点性能与业务到达过程无关,采用泊松到达可以准确地分析不同业务的性能。本文建模的基础是分组平均服务时间,使分析模型与实际的网络形态无关;基于归一化参数的算法也增大了模型的适应性,使其可以应用在网络规划设计、业务接入控制和分组调度等诸多方面。关键词:WMN;路由器节点;排队论;性能分析;泊松到达;归一化中图分类号:TN
3、92文献标志码:Adoi:10.3969/j.issn.1001-8360.2011.06.008TrafficModelingandPerformanceAnalysisofRelayNodesinWirelessMeshNetworksLIZhi-jie,FANGXu-ming(SchoolofInformationScienceandTechnology,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:WMNrouternodesmaintainthemaintrafficservicesofWMNs,whichdete
4、rminestheperformanceoftheentirenetwork.Trafficmodelingandperformanceanalysisarethehotspotsofcurrentresearches.Inthispaper,onthebasisoftheaveragegroupingservicetimecalculatedfromthe802.11OFDMPHYlayer,thetheo-reticalmodelofthetrafficperformanceWMNrouternodesisbuiltwiththesupportofthequeuetheoryandthe
5、calculatingmethodforsuchperformanceisgiven.Alsothesimplifiedcalculatingmethodbyuseofthenormali-zedmodelparametersisgiven.Theresearchresultsindicateasfollow:Intherelativelystablenetworkenviron-ment,theperformanceofrouternodesaredependentonthearrivalprocess,sodifferentmodelsandmethodsneedtobeusedtoan
6、alyzetheperformanceofVBR(VariableBitRate)andCBR(ConstantBitRate)traffic;inthedynamicnetworkenvironment,theperformanceofrouternodesisindependentofthearrivalprocess,thePoissonarrivalcanbeusedtoanalyzetheperformanceofdifferenttypesoftrafficaccurately.Beingestablishedonthebasisoftheaveragegroupingservi
7、cetime,theproposedmodelisindependentoftheactualstateofthenetwork;calculationwithnormalizedparametersenhancestheapplicabilityofthemodel.Themodelmaybeap-pliedinmanyareas,suchasnetworkplanning,accesscontroland