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1、ADelay-TolerantNetworkArchitectureforChallengedInternetsKevinFallIntelResearch,Berkeleykfall@intel-research.netABSTRACT•ExoticMediaNetworks:Exoticcommunicationmediaincludesnear-Earthsatellitecommunications,verylong-Thehighlysuccessfularchitectureandprotocolsoftoday’sdis
2、tanceradiooropticallinks(e.g.deepspaceInternetmayoperatepoorlyinenvironmentscharacterizedbyverycommunicationswithlightpropagationdelaysinthesecondslongdelaypathsandfrequentnetworkpartitions.Theseproblemsorminutes),acousticlinksinairorwater,andsomefree-spaceareexacerbate
3、dbyendnodeswithlimitedpowerormemoryopticalcommunications.Thesesystemsmaybesubjecttoresources.Oftendeployedinmobileandextremeenvironmentshighlatencieswithpredictableinterruption(e.g.duetolackingcontinuousconnectivity,manysuchnetworkshavetheirplanetarydynamicsorthepassing
4、ofascheduledship),mayownspecializedprotocols,anddonotutilizeIP.Toachievesufferoutageduetoenvironmentalconditions(e.g.weather),interoperabilitybetweenthem,weproposeanetworkarchitectureormayprovideapredictably-availablestore-and-forwardandapplicationinterfacestructuredaro
5、undoptionally-reliablenetworkservicethatisonlyoccasionallyavailable(e.g.low-asynchronousmessageforwarding,withlimitedexpectationsofearthorbitingsatellitesthat“pass”byperiodicallyeachday).end-to-endconnectivityandnoderesources.Thearchitectureoperatesasanoverlayabovethetr
6、ansportlayersofthenetworksit•MilitaryAd-HocNetworks:Thesesystemsmayoperateininterconnects,andprovideskeyservicessuchasin-networkdatahostileenvironmentswheremobility,environmentalfactors,orstorageandretransmission,interoperablenaming,authenticatedintentionaljammingmaybec
7、ausefordisconnection.Inforwardingandacoarse-grainedclassofservice.addition,datatrafficonthesenetworksmayhavetocompeteforbandwidthwithotherservicesathigherpriority.Asanexample,datatrafficmayhavetounexpectedlywaitseveralCategoriesandSubjectDescriptorssecondsormorewhilehig
8、h-priorityvoicetrafficiscarriedonthesameunderlyinglinks.SuchsystemsalsomayalsohaveC.2.1[NetworkArchitectureand
