gateway adaptive pacing for tcp across multihop wireless networks and the internetnew

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1、GatewayAdaptivePacingforTCPacrossMultihopWirelessNetworksandtheInternet*SherifM.ElRakabawy,AlexanderKlemm,andChristophLindemannUniversityofLeipzigDepartmentofComputerScienceAugustusplatz10-1104109LeipzigGermanyhttp://rvs.informatik.uni-leipzig.de/ABSTRACTofmultihopwirelessnetworksandthewire

2、dInternet:inmultihopInthispaper,weintroduceaneffectivecongestioncontrolschemewirelessnetworksmostlossesexperiencedbyTCPareduetoforTCPoverhybridwireless/wirednetworkscomprisingapacketdropsattheIEEE802.11linklayerofintermediatenodes.multihopwirelessIEEE802.11networkandthewiredInternet.WeHidde

3、nterminalandexposedterminaleffectsarethereasonforproposeanadaptivepacingschemeattheInternetgatewayforthesepacketdropsinmultihopnetworks[11].Incontrast,inthewired-to-wirelessTCPflows.Furthermore,weanalyzethecausesInternetalmostallpacketlossesareduetobufferoverflowsatfortheunfairnessofoncomin

4、gTCPflowsandproposeaschemetorouters.throttleaggressivewired-to-wirelessTCPflowsattheInternetOnesolutionforthisproblemliesinsplittingtheTCPgatewaytoachievenearlyoptimalfairness.Thus,wedenotetheconnectionatthenodeinterfacingthewiredandwirelesspartoftheintroducedcongestioncontrolschemeTCPwithG

5、atewayAdaptivenetwork,denotedastheInternetgateway.Insuchasplit-connectionPacing(TCP-GAP).Forwireless-to-wiredflows,weproposeanapproach,aspecializedtransportprotocollikeATP[15]mayruninadaptivepacingschemeattheTCPsender.IncontrasttopreviousthewirelesspartwhereasthewiredpartusesstandardTCP,e.g

6、.work,TCP-GAPdoesnotimposeanycontroltrafficoverheadforTCPNewReno.However,astraightforwardsplit-connectionachievingfairnessamongactiveTCPflows.Moreover,TCP-GAPapproachdoesnotpreservetheend-to-endsemanticsofTCPandcanbeincrementallydeployedbecauseitdoesnotrequireanyrequirescomplicatedhandoverp

7、roceduresincaseofmobility[4].modificationsofTCPinthewiredpartofthenetworkandisfullyAnothersolutionliesinemployingTCPNewRenoinhybridTCP-compatible.Extensivesimulationsusingns-2showthatTCP-wireless/wirednetworksandperformingmodificationsinallmobileGAPishig