On the influence of signal attenuation factors on

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1、OntheinfluenceofsignalattenuationfactorsonpacketdisseminationinadhocwirelessnetworksEugenePerevalovRickBlumLehighUniversityLehighUniversityBethlehem,PA18015Bethlehem,PA18015eup2@lehigh.edurblum@eecs.lehigh.eduAbstract—SimulationsshowthatsignalattenuationfactorslikeIthasbe

2、enshownin[4]thatthecaptureprobabilityinthefadingandshadowingimprovetheefficiencyandspeedofroutelimitofinfinitenumberifsimultaneoustransmitters(underdiscoveryprocessesinadhocwirelessnetworksthatrelyontheRayleghfadingandlognormalshadowingmodel)doestheuseofslottedALOHAchannel

3、.Ontheotherhand,thenotdependontheshadowingstandarddeviation¾andiscaptureprobabilityhasbeenshowntobeindependentofthedeterminedbythethethresholdparameter1bonly.Ontheshadowing.Whilethedetailedmodelingoftheroutediscoverypacketdisseminationinanetworkisrathercomplicated,itisot

4、herhand,simulations2clearlyindicatethatmoreseverepossibletoprovidethe“physical”reasonforthepositiveinfluenceshadowingisbeneficialfortheperformanceofaroutedis-ofrandomsignalattenuationfactors.Itturnsoutthat,inacoveryprocesswheretherouterequest(RREQ)packetsarepresenceofnsimu

5、ltaneoustransmitters,theprobabilityofabroadcastandtheperformancedependsonhowmanyothersuccessfulpacketreceptionfromagivennodeconditionedonareceptionfromthesamenodeintheprevioustimeslothasnodesaRREQpacketisabletoreachinafixednumberofafinitelimitforn!1(asopposedtotheunconditi

6、onaltimeslots,or,equivalently,howmanynodesinthenetworkreceptionprobabilitywhichscalesas1=n)andislowerforreceivenewRREQpacketsinagiventimeslot(seee.g.strongershadowingenvironments.Thelatterpropertymakes[5]foradiscission).Whileadetailedmodelingofaroutereceptionofdifferentp

7、acketsinsuccessiveslotsmorelikelyandrequestpacketdisseminationinanadhocnetworkisratherimprovesroutediscoveryperformance.complicated,webelieveitwouldbeaninterestingandusefulKeywords:Wirelessnetworks,adhocnetworks,routestartingpointtoexplainthe“physicallayer”reasonforthedi

8、scovery,flooding.improvementinroutediscoveryperformancewiththeincreaseinshadowingseverity.I.INTRODUCTION