基于802.11的无线MESH网络智能接入点MAC协议研究

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1、西南交通大学硕士学位论文基于802.11的无线Mesh网络智能接入点MAC协议研究姓名：傲丹申请学位级别：硕士专业：通信与信息系统指导教师：方旭明20060301西南交通大学硕士研究生学位论文第1I页AbstractWifelessMeshNetworkfWMN)isanewtypeofbroadbandwiTelessaccessnetworkthatcombinestheadvaⅡtagesofWLANandlheAdhocNetworks．Ithashighfeliabililyandflexibilit

2、y．InrecentyearS，multifhediaapplicationsaIemoreandmorepopular，andwirelessmeshnetworksarewidelyusedincommercialenvironments．Therefore，jtiscrucialforwirelessmeshnetworkstosupportQuality-00Service(Qos)．However，somedistjnctcharacteristicsofwirelessmeshnetworks，su

3、chasthemulti-hop，distribution，self-organizationandmobjlity，significall”yimpacttheperformanceoftheMACprotoc01，andmakeitbeVerydifficulttopmVideeffectiVeQoS．MACprotoc01isthemainfactortodeterminetheefficiencyofthesh酊edwir吼essehannel．AnenhancedmechanjsmEDcA(Enhan

4、cedDistrjbutedChannelAccess)hadbeenputforwardintheIEEE802。11e，whichisanimpfovedalgorithmtosupportQoS。TllisthesismainlvfocusesonhowtoprovideIheQoSinwirelessmeshnetwofks，wherethetopologyisdynamicandthebandwidthisconstrained．’I’0wardstoprOvidingmultimediatraf6c

5、aswe玎asdifFcrentiating10caIandforwardtraffic，theworkinvesti足ateslhemulli_channeIMACforwirelessmeshnetworksbasedonIEEE802．11e，andsomeOriginalschemesareproposed．Firstlv’thearchitecturc_thedifferencesbetweenWMNalldothernetworks，applicationsasweⅡasso趣eadvanta寥so

6、fwir￡lessmeshne嘶oIksareintroduced．T1leMACprotocoljⅡWMNandinVestigatesthemulti—channelMACmechanismsareaⅡaIyzedandsummarized．Secondl)’thispaperbrienyintroduceshow802．11eEDCAworksandprOposesanimproVedalgorithmnamedD-EDCA．D—EDCAisamodifiedschemesbasBdonEDcA．D—ED

7、CAprovidesanewdefinitioninwhichuserIeVeltrafncmappstOthenewpriority，meanwhiIeithasa“differentiatinglocalandforward打af珏c’1fuⅡctjon．Thirdly，wesjmulatedthethroughputofD—EDCAbychan百ngtheimpactfactorssuchasAIFS，CWPFandthenumberofs￡alions．Thepara珏letersofD-EDCAnee

8、dtobemodifjedtoachieVebestperformance．IncreasingtheAIFS，CWminandPFofIowprioritytrafficcanimproveIhethroughputofhighpriority西南交通大学硕士研究生学位论文第1II页trafEc．Finally，theperformanceofD—EDCAinwirelessmesh