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
routediscoveryprocess.Theaimhereistousealessim-portantframetovalidatealternateroutessothatwhentheprimaryroutefails,acachedalternateroutecanbeusedthathasahighprobabilityofbeingvalid.Fig.[3,4,5,6]
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