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Tworesearchteams,oneledbyProfessorJeonghoKwakoftheDepartmentofElectricalEngineeringandComputerScienceatDGIST(PresidentKukYang)andtheotherbyProfessorJihwanChoioftheDepartmentofAerospaceEngineeringatKAIST(PresidentKwangHyungLee),havedevelopednewedge-computingoffloadingandnetwork-slicingtechniquesthatcanbeutilizedinnext-generationlowEarthorbit(LEO)satellitenetworksystems.

LEOsatellitenetworkreferstoacommunicationnetworkthatprovidesstableInternetservicesusingsatellitesthatorbit3001500kmfromEarth.Unlikebasestationsbuiltontheground,toandfromwhichradiowavesareoccasionallyobstructedbymountainsorbuildings,LEOsatellitescanbeusedtobuildcommunicationnetworksinlocationswherebasestationsaredifficulttodeployowingtolowpopulationdensitybylaunchingthesatellitesintoorbit.Therefore,LEOsatellitenetworkshavereceivedattentionasnext-generationsatellite-communicationsystemsthatcanrapidlyprovidecommunicationservicestomorediverseregions.

Edgecomputingdiffersfromcloudcomputinginthatdataisprocessedineachdeviceinadistributedmanner.Sincedataisprocessedandthecomputationalresultsareappliedtotheedgewherethedataiscollected,congestioninthedatacentercanbemitigated.

Althoughstudiesonedgecomputinginexistingterrestrialnetworkshavebeenactivelyconducted,adifferentapproachisneededtoapplyedgecomputingtoLEOsatellites.Thisisbecauseallsatellitecomponentsofthecorenetworks,includingLEOsatellitenetworks,areconnectedwirelessly,andthesatellitesorbitaroundtheEarthataveryhighspeed.Furthermore,thesatelliteshavealowerpowersupplyandcomputingpowerthanterrestrialnetworks.Therefore,customizedsolutionsareneededfornewareasthathavenotbeencoveredbyterrestrialnetworks.

Therefore,ProfessorJeonghoKwakandProfessorJihwanChoisresearchteamsproposedanetworkslicingtechnique[1]thatharnessesthedistributionandmovementcharacteristicsofLEOsatellitesandthecharacteristicsofwireless-channelenvironmentsinascenariowithseveralvirtualizedservices.Atthesametime,theyalsoproposedacodeanddata-offloadingtechnique[2]forsatellite-edgecomputing.

Theedge-computingandslicingtechniquesdevelopedforLEOsatellitesinthisresearcharesignificantbecausetheyadvancethedomesticsatellitenetworktechnologyonestepfurther.However,inSouthKorea,thistechnologyisstillintheearlystagescomparedwithoverseascountries,whereLEOsatelliteInternetservicessuchasElonMusk'sStarlinkarebeingcommercialized.

ProfessorJeonghoKwakoftheDepartmentofElectricalEngineeringandComputerScienceatDGISTstated,Thisresearchanalyzedtheeffectofnetworkslicingandcode/dataoffloadingratioaccordingtothechangingLEOsatelliteenvironment."Headded,"OurgoalistoprovideablueprintfornovelapplicationsforLEOsatellitesinthe6Gerainthefuture."

Meanwhile,theresearchresultswerepublishedintheIEEEInternetofThingsJournalonAugust1,2022,withTaeyeonKim,aPh.D.studentoftheDepartmentofElectricalEngineeringandComputerScienceatDGIST,asthefirstauthor.

Correspondent author's e-mail address :jeongho.kwak@dgist.ac.kr

[1]Networkslicing:Atechnologythatcanprovidepersonalizedservicesbydividingonephysicalcorenetworkintomultiplevirtualnetworks.

[2]Offloadingtechnique:Distributesrapidlyincreasingdatatraffictoothernetworks

IEEE Internet of Things Journal

Satellite Edge Computing Architecture and Network Slice Scheduling for IoT Support

1-Aug-2022

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Edge computing has given wings to low Earth orbit (LEO) satellite communication, a 6G core technology! - EurekAlert