Brian Carey IEEE 802.11r

《Brian Carey IEEE 802.11r》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、IEEE802.11rIntroIEEE802.11risalsoknownasFastBasicServiceSetTransitionorFastBSSTransition.The802.11risaproposedprotocoldesignedtospeedhandoffsofmobileclientssuchaswirelessphonesbetweenaccesspoints.802.11rspeedstransitionsbetweenaccesspointsbyredefiningthes

2、ecuritykeynegotiationprotocol,allowingboththenegotiationandrequestsforwirelessresourcesIfyouaredrivingtoanotheronthehighwayat50mphyourmobiledevicemayhavetocontactandconnecttoanewaccesspointonceevery10secondsorevenfaster.Originallythiswasnotalargeproblembec

3、ausenotmuchinformationneededtobeexchangedtoconnecttoaaccesspoint.Asmore802.11standardswereintroducedforsecuritytheamountofcontactinformationthemobileclientneededtosendbecameimmenselylarger.Themoreinformationtheclientneededtosendthelongerittooktoconnectandth

4、elongerthepauseinconnectionwasmaintained.802.11rproposeschangesthatwillbringthehandoffpauseinservicedowntoorbelow50millisecondswhichisnotperceivablebythehumanear,andthereforetoyouundetectable.How802.11rworksThemobiledevicewillfirstscantheareaforavailableac

5、cesspoints.Thenthedevicewillexchangethe802.11authenticationmessagewiththeaccesspointandwaitforitsresponse.Thenthedevicesendsareassociationmessageandestablishesaconnectionwiththeaccesspoint.Atthispointinan802.1XBSS,theaccesspointandclienthaveaconnection,bu

6、tarenotallowedtoexchangedata,astheyhavenotestablishedakey.A802.11rtransitionperformsthesameoperationsexceptforthe802.1Xnegotiation,butpiggybacksthePTKandQoSadmissioncontrolexchangeswiththe802.11AuthenticationandReassociationmessages.IEEE-802.11rApplications

7、KeymarketsforVoiceoverWi-Fiwillmostlikelyincludehospitals,manufacturingindustries,educationalinstitutions,andgovernmentbuildings.Sinceinthesemarketsyouoftenhaveemployeessuchassupervisors,superintendants,anddoctorswhomaymovebetweenmanybuildingsonalargecampus

8、802.11rwillallowthemtobeinconstantcontactwitheachother.StanSchatt,vicepresidentandresearchdirectorforwirelessconnectivityatABIResearchhassaid“Since802.11risabasicmiddlewareunlike802.11n,compani