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1、華東師范大學(xué)博士學(xué)位論文以無(wú)線接入點(diǎn)為中心的WLAN主動(dòng)控制策略研究姓名:楊早申請(qǐng)學(xué)位級(jí)別:博士專業(yè):系統(tǒng)分析與集成指導(dǎo)教師:王能20040501華東師范大學(xué)研究生院博士學(xué)位論文AbstractRecentlythewirelessLANhasbeenwidelydeployedandstudied,especiallyfortheonesundertheIEEE80211standardThroughtheexperimentsand
2、theanalysisofthepreviousstudies,threemajorfactorsarethoughttoinhibittheWLANtobemoreefficient,廿leyaretransmissioncollision,transmissionerrorandhandoverbetweendifferentwirelessaccesspointsAccompanyingthemtheshortcomingofco
3、ngestioncontrolinupperprotocolalsodamagestheperformanceofWLANInthispaper,theactivecontrolstrategythatisdrivenbythewirelessaccesspointisproposedtesolvetheseproblemsTheactivecontrolstrategyintroducesamechanismtoexchangeinf
4、ormationandinstructionsbetweenthewirelessaccesspointandthewirelessterminals,bythismechanismwirelessaccesspointCallmakeanintegralviewoftransmissionsonthewirelesslinkAftert11atthewirelessaccesspointadjuststhecontentwindows
5、ofthewirelessterminalsaccordingtothecompetitionintensityonthewirelesslinktesolvethecollisionsandavoidbeingidleforalongtimeBythismeans,theutilizationofthewirelessbandwidthispreservedTheactivecontrolstrategyconstructsamath
6、ematicalmodelforthetransmissionerrortogettheircharacteristicsBasedontheanalysisoftheburstofthetransmissionerrorthewirelessaccesspointcanchooseasuitableflamelengthforthewirelessterminalstakingaccountoftheexistenceoftransm
7、issionerrorOntheotherhand,thewirelessaccesspointkeepsdetectingtheinterferencearound,iftheexistenceofsomeinterferenceisverified,thewirelessaccesspointwillchangethechanneldynamicallytokeepagoodworkingconditionTheactivecont
8、rolstrategyputeyesonthemotiontrendofthewirelessterminals,SOitCandeducethemovingdirectionofthewirelessterminalandwirelessaccesspointthatmayaccepttheassociationwithhandoveringwirelessterminalAfterknowingSOmewirelesstermina
9、lwillhandoverthewirelessaccesspointCaninformtheupstreamroutertoadjusttheforwardingspeedforthatwirelessterminalandinformtllatwircleSSterminaltheavailablechannelsaroundtoshortentheprobetimeWhilethewirelessterminalissearchi
10、ngthenewwirelessaccesspointthepacketrelaybetweenthewirelessaccesspointsandtheparallelforwardingofthepacketsfromtheupstreamroutertomorethanonewirelessaccesspointCanreducethepacketlossduringthehandoverandprotecttheperforma
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