面向m2m业务的3glte移动通信网络中关键技术分析

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1、摘要IIABSTRACTM2M，whichiSshortfor‘'Machine-to-Machine”，meansthecommunicationdirectlybetweenmachines．Oneofthefamousstandardizationinstitutes3GPPdefinesM2M嬲onecommunicationmethodthatdoesn’tneedhumanaction．A1lthatdifferencesbetweenM2MandHuman-to．Humanaredifferentnetworksenses、lowcost、hugenetworkdev

2、icesandsmalldatatransferring．Sofartherehavebeenseveralinstitutessuch嬲3GPP,ETSI，CCSAstartedfull-scaleresearchandstandardizationofM2M．So陆cellularsystemsaredesignedaccordingtothetrafficrequirementsofH2Hcommunications．neysupplyintegratedsignalingproceduresinordertoensurethesecurityofdatatransferri

3、ngandtheflexibilityofcontrollingduringtheH2Hcommunication．InmanysensesofM2Mapplication，usuallyonlyafewdata(tenstohundredsbits)needstobesent,buttheprocedureofsignalingwilltakethousandsbitsofcost．ConsideringthehugenumberofM2Mdevices，extrasignalingwillnotonlydecreaSingthetransferringrate，butalsoc

4、ausesignalingcongestion,thusinfluentthesystemperformanceinbomH2HandM2Mcommunications．Inaconsequence，theoptimizationofsignalingandbearercontrolincellular,especially3G汀胍，systemsisnecessaryandmeaningfulforthesupportofM2Mapplications．Asfortheaboveissues，thispaperfirstanalyzesandsummarizesthetechno

5、logiesofM2MnetworkoptimizationfromthefollowingareaS：signaling，trafficmodeling，schedulingandrandomaccessalgorithms．Then，thispaperintroducesthedatatransferringandsignalingproceduresinL1msystemandM2Mtl'afhCcharacteristics，andpointsoutthelackofexistingsystems．BaSedontheanalysis，aSendMultipleCopies

6、ofDataScheme(SMCDS)isproposed．SMCDSmakescopiesoftheMACPDUwhenthedatascheduledismuchlargerthanthedatatobetransferred．AftersimulatingtheschemeandtheoriginalsystemschemeondifferentM2Mtrafnctypesanddifferentschedulingalgorithms，thesystemimprovementshowsthesystembenefitsofSMCDS．AtlaSt,thepaperintro

7、ducessometraditionalbackoffalgorithmsandthealgorithmapplyingin3G／ITEsystems．Simulationresultsshowabadperformanceoftheexistingalgorithmwhentheaccessdevicesbecomemore．Inthissituation，thepaperimportsthepseudo—BayesianbroadcaStandproposesDA