基于延迟容忍网络拥塞控制的转发算法和副本管理策略分析

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1、山东师范大学硕士学位论文ResearchofforwardingalgorithmandreplicamanagementstrategybasedoncongestioncontrolinDTNABSTRACTWiththerapiddevelopmentofwirelessnetworktechnologyandfrequentupgradesofthehand-heldelectronicequipment,theend-to-endcommunicationpatternbasedonthefullpathinsomeenvironmentapparentlyhasnowayt

2、omeetsomespecialrequirements.Inthiscase,anewnetworksystemarisesatthehistoricmoment.Thedelaytolerantnetwork(DTN)hasthepropertieswhichareapplicabletomobilenodesandnetworkconnectiongap.SincetheDTNarchitectureswerebornin2003,DTNroutinghasbecomeanindependentresearchfieldafter10yearsofdevelopment.Late

3、r,peoplefindthatthesocialcharacteristicofdelaytolerantnetworkhasimportantpracticalvalue.Sociologists,professorofpsychologyatHarvardfirstproposedthetheoryofsixdegreesofseparation:everysocialmemberintheworldonlyneedsafewintermediariestoestablishcontactwiththeothersindailylife.Accordingly,mostofthe

4、informationsentbytheuseronlyneedslesshopstobedeliveredinDTNwithsocialcharacteristic.Besides,communicationamongmobileintelligentphoneusersfollowsrules.Becauseusersfrequentlytravelbetweentheworkandlivingplaces,informationismostlypropagatedamongacertainrelationshipsuchascolleagues,friendsandfamilym

5、embers.Throughthestudyofsocialcharacteristicofdelaytolerantnetwork,weputforwardanewalgorithmbasedoncongestionawarenessandinterestreplicamanagementstrategy.Thealgorithmisbasedonsocialityandconsidersbufferanddelaycharacteristicsofthenodeandegonetwork.Theutilitiesbasedonthesecharacteristicscoverawi

6、derange,considerthoroughly,andareverysuitablefordelaytolerantnetwork.Inaddition,thealgorithmalsoadoptsthereplicamanagementstrategybasedoninteresttags.Interesttagshavegreatpertinence,avoidcopyingirrelevantinformationandonlyreceiveinterestedinformation.Sothismethodcannotonlysaveresources,butalsoca

7、ncontrolthenumberofcopiesinthenetworkandrelieveeffectivelycongestioncondition.ThispaperusestheONEsimulatortosimulateexperimentandcompareswiththreeclassicalalgorithmsoverbufferavailability,delayanddeliveryrate.Experimentalres