Content and context aware networking using semantic tagging(7)

show

Figure5.PFrame

Losses

Figure3.HFrame

Losses

Figure6.BFrameLosses

testalternateroutesandremovethemfromcacheifbro-keninaproactivemanner.Fig.[7]showstheimpactofourenhancementasthetransmissionrangeof802.11isin-creasedkeepingthenumberofnodes xedat100andspeedat15m/s.Atlowranges,ourenhancementbehavessimilartoregularDSRmainlyduetothelackofalternateroutes.Astherangeincreases,ourenhancementstartstoshowim-provementsovertheregularscheme.Fig.[8]showstheim-pactofspeedofthemobilenodes.Atlowspeeds,bothschemesarecomparablesinceroutebreakagesarenottoofrequent.Withincreasingspeeds,routesbreakmorefre-quentlywithneighborsgoingoutofrangewhereouren-hancementshowsmarkedimprovementoverregularDSR.

Figure4.IFrameLosses

theimprovementsinthelossesobservedforH,I,PandBFrameswhenregularDSRiscomparedagainstouren-hancedversion.Inthisexperiment,wemodi edthenumberofnodesinthenetworkwhilekeepingthespeedofnodes xedat15m/sand802.11rangeto250m.Foreachnodecount,thesimulationwasrun5timeswithdifferentrandommobilityscenariosandtheresultsaveraged.Inallcases,ourenhancedversionout-performsregularDSRwithverylittleoverhead(salvagingifthealternateroutechosenforvalidationisbroken).Whenaroutebreakoccursinregu-larDSR,acachedalternaterouteischosen.Inmanycases,thisroutealsoendsupbeingbrokenbutthesourcedoesnotknowthisuntilitreceivesaroutebreakerror.Ifavalu-ableframesuchasaIFramehadbeentransmittedoverthisbrokenroute,ingcontentinformation,ourenhancementisabletoidentifylowimpactcandidateframestouse

to

8

5Conclusion

Inthispaper,wepresentanarchitecturetoenableintel-ligentprocessingofdatastreamswithinthenetwork.Ourarchitecturereliesonsemantictagsprovidingcontentmeta-datathatcanbereasonedoverontheroutingelementstoenablespecializedhandlingfor ows.Ouraimistofacili-tateapplicationsanduserstocommunicatetheirpreferences

Today’s model of networking primarily concentrates intelligence at the end hosts with the network itself offering a simple“best-effort”,“data agnostic ” communication medium. However, this paradigm has proven to be insufficient to meet todays needs co

Figure7.FrameLossesvs.

Range

Figure8.FrameLossesvs.Speed

tothenetworkandletthenetworktrytoprovidetheneededlevelofservice.Policiesareusedtodriveadaptationsbothlocallyatanodeandcoordinatedacrossanetwork.Con-trolledcrosslayerinteractionsareusedtoprovidemoreef- cientprocessingwhilestillretainingtractability.Wehavealsopresentedtheresultsofoursimulationstudiesshowingthatcontentawarenessattheroutinglayeroffersbene tsovertraditionalcontentagnosticapproachestodatadistrib-utionoverawirelessnetwork.

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