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CbandspectrumSTAextensionatEricssonPlano,Texas

Report

2020-10-29 UenRevA

FCCExperimentalApplicationFileNumber:0928-EX-CN-2020

FCCFILE#:0928-EX-CN-2020

2020-10-29 UenRevA ©EricssonAB2020 2(6)

CommercialinConfidence

Contents

1 Introduction..................................................................................................3

2 Setupoverview.............................................................................................32.1 Interferencetestingandmitigationsetup...........................................32.2 AdvancedMassiveMIMOfunctionalitytesting...................................5

3 Accomplishmentsandplanahead.................................................................6

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2020-10-29 UenRevA ©EricssonAB2020 3(6)

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1 Introduction

WiththeupcomingCbandspectrumauctionsplannedbyFCC,thereislotofinterestintheindustrytostudythespectrumforeffectiveutilization.SuccesswithCbandspectrumutilizationfor5GiscriticalforUSleadershipinthecritical5Gcommunicationsegment.

CbandspectrumauctionisexpectedtobemadeavailableintwophasesfortheCellularServiceProviders(CSPs)asshowninthefigurebelow:

Figure1:CbandspectrumauctionphasesandexampleofPh-1deployment

Thechallengewithphase1isthatFSSproviderswouldstillbeoperatingbetween3820MHz–4000MHzanditisimportanttoprotecttheFSSoperationfrominterferencefromCSPs

EricssonhassetupatestingandverificationfacilityinthePlano,TexascampusprimarilyfocusingonthePhase1coexistenceofCSPandFSSoperation.

Inadditiontotheinterferencemitigationsolutiontestingandverification,itisalsocriticalforCSPstobeabletoefficientlyusethevaluablespectrumandprovideexcellent5Gservicestoconsumerandenterprise.Ericsson,Plano–TXsetupisalsobeingusedforverificationofinnovativefeaturesandfunctionalitiesthatwouldprovidehighcapacityandperformancefortheendusersofCSPs.

2 Setupoverview

2.1 Interferencetestingandmitigationsetup

EricssonhassetupaCbandtestingzoneinthePlanocampuswithtwositesasshowninthepicturebelow:

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Figure2:CbandcoverageoverviewatEricssonPlanocampus

ForevaluatingtheFSSinterferencemeasurementperFCCguidelines,EricssonhassetupatestingsolutioncomprisingofaCbanddishantennaalongwithrelevantfeedhorn,waveguidefilter,LowNoiseAmplifier(LNA)etc.Thedishantennaismountedonatrailerwhichcanbepulledtodifferentlocationsformeasurements

Figure3:Cbanddishantennasetupforinterferencemeasurement

Thevanisequippedwithsignalgenerator,spectrumanalyzertocapturethemeasurementsreceivedsignalandinterference:

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Figure4:Interferencemeasurementsetupinsidethevan

2.2 AdvancedMassiveMIMOfunctionalitytesting

The2ndCbandradioinstalledinPlanocampusisusedfortesting,developmentanddemonstrationofadvancedmassiveMIMOfunctionalityforCband.SomeoftheadvancedfunctionalitiesalreadytestedanddemonstratedasSRSbasedMulti-UserMIMO(MU-MIMO).Thisfeatureallowsextremesystemcapacityandveryefficientutilizationofpreciousmid-bandTDDspectrum.Weareabletoreachthespectralefficiencyofnearly54bits/Hz.

Figure5:MU-MIMOtestinginPlanowith8devices

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Figure6:MU-MIMOtestingresultsinPlano

3 Accomplishmentsandplanahead

EricssonhasalreadymadesignificantprogresstowardscharacterizingaCbandnetworkanditscoexistencechallengeswithCbandsatelliteoperation.TheresultsandlearningfromthemeasurementsdoneinPlanoisbeingusedfornetworksimulationandplanningactivities.Thelearningsarealsobeingfedbacktothedevelopmentunitforfurtherimprovementandoptimizationofthesolution.

Ericssonplanstousethesetupin2021tocontinuetestingnewandinnovativefeaturesforCbandsatelliteinterferencemitigationsolutionswhichwouldbeessentialforthesuccessof5GinUS.

Inadditiontotheabove-mentionedinterferencetesting,thetestspectrumwouldalsobeusedfordevelopmentandtestingofnewusecasesin5G,suchaslowlatencyusecases.