无线移动互联网：原理、技术与应用 教学课件 作者 崔勇 CH6 MIP1.ppt

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1、CS80240333CUIYong1MobileIP-MobilitySupportinInternetCS80240333Instructor:CUIYongCS80240333CUIYong2OutlineIntroductionConceptsandglossaryinmobileipv4OverviewofMIPv4MobileIPFunctionsAgentDiscoveryRegistrationTunnelingChallengesinMIPv4RouteOptimizationinMobileIPSupportingFastHandoffsinMobileI

2、PConclusionsCS80240333CUIYong3HowtocontactamobilefriendTurntoherparents?ParentsarestableShehasanewcontactShewilltellherparentswheresheisSupposeyouhaveafriendwholikestravelingandfrequentlychangesaddress.Howtocontacther?Whereisshe?CS80240333CUIYong4Scenario1Computersgetwirelessaccesstotheinte

3、rnetNomobilityactually166.111.81.xWirednetworkCS80240333CUIYong5InternetADSLISDN802.11Scenario2BringnotebookbackhomeWiredenvironmentOfflinewhilemovingCS80240333CUIYong6Scenario3AccesstointernetintrainWirelessenvironmentOnlinewhilemovingCS80240333CUIYong7Mobilityfromnetworkviewstablemobil

4、ewirelessusersbyfixedAPOnlinemobileusers(handoff)Offlinemobileusers(roaming)CS80240333CUIYong8InternetandIPBSCompanynetworkLocalISPRegionISPphysicallinknetworktransportapplicationphysicallinknetworkphysicallinknetworktransportapplicationphysicallinknetworkphysicallinknetworkIPHub,Switch,R

5、outer?CS80240333CUIYong9Problemsinmovement166.111.80.11166.111.203.0166.111.129.0Oneortwothings?Disconnectionwhilemoving（handoff）MNcan’tbecalled（roam）166.111.203.99166.111.129.88166.111.80.0IPprotocolandIPaddressisveryimportant!!CS80240333CUIYong10Twokindsofmobility1)SeamlessmobilityMobilit

6、yistotallytransparenttoapplications2)PortabilityMobilityisnottransparenttoapplicationswhenwemove,butwecanstillaccessthenetworkatanewplaceSomeprotocolssupporteitheroneofthemDHCPcansupportportabilityMobileIPcansupportseamlessmobilityCS80240333CUIYong11RequirementTothepointofattachmentWehavese

7、enthatmobileuserscanchangepointofattachmentInacellularnetwork,amobilechangesbasestation.InaWLAN,amobilechangesaccesspoint.Amobileusercanworkatofficeandathomeatdifferentinaday:mobilechangesEthernetsubnets.TotheapplicationsWewantapplicationstobenotdisturbe