资源描述：
《无线局域网edca机制mac接入延时分析》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、ISSN1000-9825,CODENRUXUEWE-mail:jos@iscas.ac.cnJournalofSoftware,Vol.19,No.8,August2008,pp.2127−2139http://www.jos.org.cnDOI:10.3724/SP.J.1001.2008.02127Tel/Fax:+86-10-62562563©2008byJournalofSoftware.Allrightsreserved.∗无线局域网EDCA机制MAC接入延时分析1,2+1,21,222周新运,皇甫伟,孙利民,王显雷,李凯慧1(中国科学院软件研究所信息安
2、全国家重点实验室,北京100190)2(中国科学院研究生院,北京100049)MACAccessDelayAnalysisofEDCAMechanismofWirelessLANs1,2+1,21,222ZHOUXin-Yun,HUANGFUWei,SUNLi-Min,WANGXian-Lei,LIKai-Hui1(StateKeyLaboratoryofInformationSecurity,InstituteofSoftware,TheChineseAcademyofSciences,Beijing100190,China)2(GraduateUniversit
3、y,TheChineseAcademyofSciences,Beijing100049,China)+Correspondingauthor:E-mail:xinyun01@ios.cn,http://www.ios.ac.cnZhouXY,HuangfuW,SunLM,WangXL,LiKH.MACaccessdelayanalysisofEDCAmechanismofwirelessLANs.JournalofSoftware,2008,19(8):2127−2139.http://www.jos.org.cn/1000-9825/19/2127.htmAbst
4、ract:AmodelisproposedtoanalyzetheMAC(mediumaccesscontrol)accessdelayofEDCA(enhanceddistributionchannelaccess)mechanismofwirelessLANs(localareanetworks),whichisbasedonthemomentgeneratingfunctionandsignalflowgraph.Themodelgivestheprobabilitydistributionfunction(PDF)ofMACaccessdelayandsev
5、eralrelativecharacteristicnumbers,includingthemeanvalue,variance,standarddeviationanddeviationcoefficientofMACaccessdelay.Theresultsoftheanalyticalmodelcoincidewithsimulations,whichvalidatesthemodelproposed.Alotofanalysesarepresented.Firstly,themodelpresentstherelationshipamongnumberof
6、nodesandsendingprobability,collisionprobability,freezingprobabilityandmeandelayofallACs(accesscategories).Secondly,themodeldisclosesthecompositionofMACaccessdelay.Thirdly,themodelpresentstheeffectofdifferentvaluesofAIFS(arbitrationinterframespacing)onMACaccessdelay.Lastly,themodelprese
7、ntsthatthedeviationcoefficientofMACaccessdelayislargerthan1,sowhentheexponentialdistributionisadoptedasthedistributionofMACaccessdelay,thecapacityofthequeuesystemwillbeevaluatedwrongly.Keywords:IEEE802.11e;EDCA(enhanceddistributionchannelaccess);MAC(mediumaccesscontrol)accessdelay;pe
