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QoSProvisioninginIP-basedBroadbandWirelessMobileNetworksWorkshoponBroadbandWirelessAd-HocNetworksandServices,12th-13thSeptember2002,
ETSI,SophiaAntipolis,France
A.H.AghvamiandBongkyoMoon
CentreforTelecommunicationsResearchKing’sCollegeLondonE-mail:{hamid.aghvami,bongkyo.moon}@kcl.ac.ukOutlineRSVPunderIPMicroMobilityProtocolProposedRSVP-basedQoSMechanismRSVPBranchPathReroutingDeterminationofCrossoverRouterunderIPmicromobilityRSVPBranchPathReroutingatCrossoverRouter(CR)SeamlessSwitchingofRSVPBranchPathRSVPBranchPathReservationinadvanceforSoftHandoff
SwitchingofRSVPBranchPathforSoftHandoff
ResultsConclusionsWirelessBandwidthRestrictions
-RSVPallowsInternetreal-timeapplicationstoreserveresourcesbeforetheystarttransmittingdata.-ManyRSVPflowscausealotofcontrolinformationoverwirelesslink-RSVPreservationrefreshmessagesneednotbesentasoftenonthewirelesslink-EfficientwirelessbandwidthmanagementschemeisrequiredRSVPIssuesunderIPmicro-mobility(1)
Mobility-WheneveraMNperformsahandoff,RSVPsignalingprocessmustbeinvokedimmediatelytodiscoverthenewpathtotheMNfromtheCNHowever,longresourcereservationdelaymayoccurduringre-establishmentofaflowafterhandoffunderRSVPServicedisruptionscouldoccurinprovidingreal-timeservicesunderRSVPandmobility.needtomakeresourcereservationsinadvancealongthepathstotheneighboringBSsRSVPIssuesunderIPmicro-mobility(2)RSVP-enabledrouterinIPmicromobilityMobilenode(MN)movesintosofthandoffzonePilotsignalstrengthfromanewBS≥TRSVPMobilenodekeepson-goingflowwithoutspecialactionMNisasender?SendRSVPPATHmessagealongthenewBStowardGWDeterminethelocationofacrossoverrouter(CR)inIPmobilitynetworksCRisareceiver?SendarouteupdatemessagealongthenewBStowardGWRSVPdaemonontheCRimmediatelysendsanRESVmessagetowardtheMNBSreceivesanRESVmessage,andthenexecutesresourceallocationalgorithmoverwirelesslinktoreserveresourceRSVPdaemonontheCRimmediatelytriggersaPATHmessagetowardtheMNMNsendsRESVmessagetowardtheintendedreceiverYesNoYesYesNoNoRSVPreservationiscompletedwithinthresholdtime?QoSdisruptionQoSguaranteedSofthandoffinitiateswithRSVPreservationalongthenewpathbyswitchingRSVPbranchpathsuccessfullyYesNoProposedRSVP-basedQoSMechanism
RSVPBranchPathReroutingunderIPMicroMobilityProtocol
InthecaseanMNisasender,anRSVPPATHmessageissentbyanMNaftertherouteupdateiscompleted.WhentheRSVPdaemonontheCRreceivesanRSVPPATHmessageafteramobilityevent,itimmediatelysendsanRSVPRESVmessagetoanMNwithoutdeliveringtotheoriginalreceiver.InthecaseanMNisareceiver,theRSVPdaemonontheCRcantriggeranRSVPPATHmessageimmediatelywhen
detectinganychangestothestoredPATHstateorreceivingaPCNmessagefromtheunderlyingroutingdaemon.DeterminationofCrossoverRouter-HavingmultiplehopsforaRSVPconnection=>morelinksareutilizedandthisincreasesthenetworkcongestionandresourcereservationfailureshorterhopsandcircuitreuseshouldbeconsideredduringRSVPpathreroutingRSVPpathre-establishmenttimedependsonthenumberofhopsrequiredinreroutingtheRSVPpartialbranchpath,acrossoverrouter(CR)dependent.branchpathreroutingatCRintreetopologyguaranteestheminimumpathchangeandtheshortestpathReroutingofBranchPathatCRRSVPBranchPathReroutinginaTree
InternetGateway(GW)CrossoverRouter(CR)MNCRRSVPPathReroutingSignalingatCRMNAR(BS)CRGWrouteupdaterouteupdaterouteupdatePATHPATHRESVRESVMNAR(BS)CRGWrouteupdate&PATHrouteupdate&PATHrouteupdateRESVRESV-MNisasender-MNisareceiverSeamlessSwitchingofRSVPBranchPathunderIPMicroMobilityProtocolAccessRouterAPilotStrengthTADDTRSVPTDROPDistanceRSVPReservationRequestalongthenewPathviaBS‘B’SofthandoffInitiationwithRSVPReservationalongthenewPathRSVPPathPreparationZone(S)AccessRouterBSoftHandoffZoneHandoffDropTimerRSVPPathReservationforSoftHandoffCNGWMNCRInternetBS‘A’BS‘B’OriginalRSVPreservationpathoftheflowBranchpathaddednewlyduringsofthandoffSwitchingofRSVPBranchPath(1)IPMicroMobilityNetworksOriginalRSVPreservationpathoftheflowBranchpathaddednewlyduringsofthandoffCrossoverRouterGatewayRouterAccessRouterCNSwitchingofRSVPBranchPath(2)VariousTRSVPunderV=9.0m/sandhighload.ProbabilityofServiceDisruption(1)MN’svariousvelocityunderTRSVP=-13.4dBandhighloadProbabilityofServiceDisruption(2)VariousloadconditionunderV=10.0m/sandTRSVP=-13.3dBProbabilityofServiceDisruption(3)VariousTRSVPunderV=9.0m/s,highloadand1MbpsdatarateMeanNumberofLostPacketsConclusionsThereroutingoftheRSVPbranchpathatacrossoverrouterisconsideredinordertominimizetheresourcereservationdelayandthe
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