RP-193234-WID NR-NTN-for Rel-17 v4.0（通信技術知識）

3GPPTSGRANmeeting#86 RP-193234

Sitges,Spain,December9-13,2019 revisionfromRP-192502,3144

Source: Thales

Title: SolutionsforNRtosupportnon-terrestrialnetworks(NTN)

Type: WIDnew

Documentfor: Approval

AgendaItem: 9.1.2–ProposalsledbyRAN2

Release Rel-17

3GPP?WorkItemDescription

Forguidance,see

3GPPWorkingProcedures

,article39;and

3GPPTR21.900

.

Comprehensiveinstructionscanbefoundat

/Work-Items

Title:SolutionsforNRtosupportnon-terrestrialnetworks(NTN)

Acronym:

Uniqueidentifier:

NOTE: FornewWIs/SIsleavetheUniqueidentifieremptybutyoumaymakeaproposalforanAcronym.

IfthisisaRANWIDincludingCoreandPerf.part,thenTitle,AcronymandUniqueidentifierrefertothefeatureWI.

Pleasetick(X)theapplicablebox(es)inthetablebelow:

Either:

ThisWIDincludesaCorepart

X

ThisWIDincludesaPerformancepart

X

or:

ThisWIDincludesaTestingpart

anditaddressesthefollowing3GPPworkarea:

RadioAccess

CoreNetwork

Services

1 Impacts

Affects:

UICCapps

ME

AN

CN

Others(specify)

Yes

X

X

X

No

X

Don'tknow

X

2 ClassificationoftheWorkItemandlinkedworkitems

2.1 Primaryclassification

Thisworkitemisa…

X

Feature

BuildingBlock

WorkTask

StudyItem

includingsomestudyactivities.

NOTE: Normally,Core/Perf./TestingpartsinRANWIDsareBuildingBlocks.OnlyiftheyareunderanSAorCTumbrella,wedefinethemasworktasks.Ifyouareindoubt,pleasecontactMCC.

2.2 ParentandchildWorkItems

ParentandchildWorkItems

UniqueID

Title

Natureofrelationship

{mandatorytext:"parentWID"or"childWID"}

NOTE: RANagreedsometimeago,thatitdescribesthefeatureWI+Core/Perf.partWIorTestingpartWIinoneWID.ThereforethetableaboveshouldjustincludethefeatureWIUniqueIDandtitleandNatureofrelationshipis"parentWID".

2.3 OtherrelatedWorkItemsanddependencies

OtherrelatedWorkItems(ifany)

UniqueID

Title

Natureofrelationship

PrecedingRel-15&RelWI

TheproposedWIDwillleveragetheNRandNG-RANspecifications

750040

StudyonNRtosupportnon-terrestrialnetworks(FS_NR_nonterr_nw)

TheproposedWIDwillmakeuseofthechannelmodeldefinedbytheFS_NR_nonterr_nwstudy

800099

StudyonsolutionsforNRtosupportnon-terrestrialnetworks(FS_NR_NTN_solutions)

TheproposedWIDwillleveragesolutionsidentifiedinFS_NR_NTN_solutionstoaddressthekeyissuesassociatedtoNTN

800026

Studyonarchitectureaspectsforusingsatelliteaccessin5G(FS_5GSAT_ARCH)

TheproposedWIDcantakeintoaccountforinstancetheQoSmanagementandSatelliteNG-RANglobalidentitiessolutionsidentifiedinFS_5GSAT_ARCH.

NOTE: Classicalexamples:ListaprecedingSIoraprecedingWI(e.g.ifyoufurtherenhanceatopic).AlsorelatedordependentWIsinotherTSGsshouldbeindicated.

Dependencyonnon-3GPP(draft)specification:-

3 Justification

Non-terrestrialnetworksrefertonetworks,orsegmentsofnetworks,usinganairborneorspacebornevehiclefortransmission:

Spacebornevehicles:Satellites(includingLowEarthOrbiting(LEO)satellites,MediumEarthOrbiting(MEO)satellites,GeostationaryEarthOrbiting(GEO)satellitesaswellasHighlyEllipticalOrbiting(HEO)satellites)

Airbornevehicles:HighAltitudePlatforms(HAPs)encompassingUnmannedAircraftSystems(UAS)includingLighterthanAirUAS(LTA),HeavierthanAirUAS(HTA),alloperatinginaltitudestypicallybetween8and50km,quasi-stationary.

In3GPPTS22.261approvedatSA#82,usecasesfor5GSatelliteintegrationandthecorrespondingservicerequirementshavebeenidentifiedasresultoftheworkitem“5GSAT”.Thiswilladdressmobilebroadbandneedsinunserved/underservedareasaswellaspublicsafetyneeds,maritime(3GPPTS22.119“Maritimecommunicationservicesover3GPPsystem”),airplaneconnectivityandrailwaycommunicationservicerequirementsapplicabletosatelliteaccess.

SinceRAN#76,twoactivitiesonNRtosupportNon-TerrestrialNetworkshavebeensuccessivelycarriedout

Afirstactivity,FS_NR_nonterr_nw(seeRP-171450)studiedthechannelmodelforthenon-terrestrialnetworks,todefinedeploymentscenarios,parametersandidentifythekeypotentialimpactsonNR.TheworkledbyRANstartedatRAN#76andhasbeencompletedatRAN#80.TheresultsarereflectedinTR38.811.

Asecondactivity,FS_NR_NTN_solutions(seeRP-190710),defineandevaluatesolutionsfortheidentifiedkeyimpactsfromthefirstactivity.TheworkledbyRAN3startedatRAN#80andisplannedtobecompletedatRAN#86.TheresultsarereflectedinTR38.821(RP-193062).

FurthermoreanemaildiscussiontookplacebetweenRAN#85and#86onthescopingofaREl-17WIonnon-terrestrialnetwork.ThereportofthisemaildiscussionisavailableinRP-192500.ItconcludedthattheRel-17NR-NTNNWIshouldincludetwoactivities:

NormativeactivityonNR-NTNtodevelopspecificationstosupportthefollowingscenarios:

TransparentpayloadbasedLEOscenarioaddressingatleast3GPPclass3UEwithandwithoutGNSScapabilityandbothEarthfixed&/ormovingcellscenario(asperSIoutcome).

Note1:AddressingLEOwillprovidetheflexibilitytoalsosupporttransparentpayloadbasedHAPSbasedscenarios.

TransparentpayloadbasedGEOscenarioaddressingUEwithGNSScapability.

Note2:AddressingLEOandGEOscenarioswillenableNRtosupportallNGSOscenarioswithcircularorbitataltitudegreaterthanorequalto600km.

StudyactivityonNTNscenariosaddressing

TransparentpayloadbasedHAPSscenarios:StudyofenablersforSpectrumcoexistencewithcellular(additionalCoresets,PCIconfusionmitigation,..)

IoT-NTNbasedscenarios

NTN-networkbasedlocationofUE(forregulatoryservices):identifypossiblesolutions

Basedontheabovepoints,anewworkitemisproposedtocarrytheconclusionoftheFS_NR_NTN_solutionsstudyitemandspecifythesolutionsenablingNRtosupportnon-terrestrialnetworks.

AddressingLEOandGEOscenarioswillenabletosupportallNGSOscenarioswithcircularorbitataltitudegreaterthanorequalto600km.

4 Objective

4.1 ObjectiveofSIorCorepartWIorTestingpartWI

TheworkitemaimstospecifytheenhancementsidentifiedforNRNTN(non-terrestrialnetworks)especiallyLEOandGEOwithimplicitcompatibilitytosupportHAPS(highaltitudeplatformstation)andATG(airtoground)scenariosaccordingtothefollowingprinciples:

FDDisassumedforcorespecificationworkforNR-NTN.

NOTE:ThisdoesnotimplythatTDDcannotbeusedforrelevantscenariose.g.HAPS,ATG

EarthfixedTrackingareaisassumedwithEarthfixedandmovingcells

UEswithGNSScapabilitiesareassumed.

ThedetailedobjectivesaretospecifyenhancingfeaturestoRel-15&Rel-16’sNRradiointerface&NG-RANasfollows:

4.1.1 RAN1

Enhancingfeaturestoaddresstheidentifiedissuesduetolongpropagationdelays,largeDopplereffects,andmovingcellsinNTN,thefollowingshouldbespecified(seeTR38.821):

Timingrelationshipenhancements[RAN1,RAN2]

EnhancementsonULtimeandfrequencysynchronization[RAN1,RAN2]

HARQ

NumberofHARQprocess[RAN1]

Enabling/disablingofHARQfeedbackasdescribedintheTR38.821[RAN1&2]

Inaddition,thefollowingtopicsshouldbespecifiedifbeneficialandneeded

EnhancementonthePRACHsequenceand/orformatandextensionofthera-ResponseWindowduration(inthecaseofUEwithGNSScapabilitybutwithoutpre-compensationoftimingandfrequencyoffsetcapabilities)[RAN1/2].

Feederlinkswitch[RAN2,RAN1]

BeammanagementandBandwidthParts(BWP)operationforNTNwithfrequencyreuse[RAN1/2]

Includingsignallingofpolarizationmode

4.1.2 RAN2

NOTE:offsetbasedsolutionsfortimeradaptationsareassumed.

Thefollowinguserplaneproceduresenhancementsshouldbespecified(seeTR38.821)

MAC

Randomaccess:

Definitionofanoffsetforthestartofthera-ResponseWindowforNTN.

Introductionofanoffsetforthestartofthera-ContentionResolutionTimertoresolveRandomaccesscontention

SolutionsforresolvingpreambleambiguityandextensionofRARwindow.

AdaptationforMsg-3scheduling

Onlyforthecasewithpre-compensationoftimingandfrequencyoffsetatUEside)

EnhancementonULschedulingtoreduceschedulinglatency.

DRX:

IfHARQfeedbackisenabled,introductionofoffsetfordrx-HARQ-RTT-TimerDLanddrx-HARQ-RTT-TimerUL.

IfHARQisturnedoffperHARQprocess,adaptionsinHARQprocedure

SchedulingRequest:Extensionofthevaluerangeofsr-ProhibitTimer

RLC

Statusreporting:Extensionofthevaluerangeoft-Reassembly

SequenceNumbers:extensionoftheSNspaceonlyforGEOscenarios

PDCP

SDUdiscard:ExtensionofthevaluerangeofdiscardTimer.

SequenceNumbers:extensionoftheSNspaceforGEOscenarios.

Thefollowingcontrolplaneproceduresenhancementsshouldbespecified(seeTR38.821)

Idlemode:

Definitionofadditionalassistanceinformationforcellselection/reselection(e.g.usingUElocationinformation,satelliteEphemerisinformation)

DefinitionofNTN(satellite/HAPS)cellspecificinformationinSIB

Connectedmode

Enhancementnecessarytotakeintoaccountlocationinformation(UE&Satellite/HAPS)and/orephemerisindeterminingwhentoperformhand-over,inordertohaveahighdegreeofhand-overcontrolforhand-overrobustnessandcoveragemanagement.

Enhancementtoexistingmeasurementconfigurationstoaddressabsolutepropagationdelaydifferencebetweensatellites(e.g.SMTCmeasurementgapadaptationtotheSSB/CSI-RSmeasurementwindow)[RAN2/4].

ServicecontinuityformobilityfromTNtoNTNandfromNTNtoTNsystems(tobeaddressedwhenconnectedmodemobilityhassufficientlyprogressed)

IdentifypotentialissuesassociatedtotheuseoftheexistingLocationServices(LCS)applicationprotocolstolocateUEinthecontextofNTNandspecifyadaptationsifany[RAN2/3]

Furthermorethefollowingcanbeconsideredwith2ndpriority

VerifytheapplicabilityofexistingRel-16ANRtechniquestosolvePCIconfusioninordertosupportco-channeloperationbetweenHAPS&terrestrialnetworksanddevelopenhancementsifneeded[RAN2/3]

4.1.3 RAN3

ThefollowingNG-RANarchitectureenhancementsshouldbespecified(seeTR38.821)

tosupportfeederlinkswitchoverinTransparentpayloadarchitecturebasedLEOscenarios

networkidentitieshandling

registrationupdateandpaginghandling

cellrelationhandlingandrelatedfeaturese.g.neighbours,ANR,RANpaging…

4.1.4 RAN4

StudytheframeworkhowNTNcorerequirementsaredefined.

Specifythefollowingrequirements[RAN4](Note1)

UERRMcorerequirements

StudyandidentifywhichbandsmaybepotentiallyrelevanttoNTNincluding:

Analysisofregulationsinthespectrumconsidered

Adjacentchannelco-existence

ConsideringthepotentialbandstobeusedasexamplefortheWID:

SpecifyneededgenericRFcorerequirementsforthenetworkandtheUEsuchthatadjacentchannelco-existencescenariosaremetandperformanceofotherRFparameters(RXperformance,TXsignalqualityetc.)aresubjecttoacceptableminimumrequirements

InvestigateandspecifyUEtiming&frequencyprecompensationaccuracyrequirementsasneeded[RAN4].

Note1:ItisassumedthatthisworkitemwillbefrequencyagnosticandthereforewecanconsiderthatNTNcanoperateinFR1orFR2ranges.DefiningNRbandsforNTNshouldbeincludedaspartofdedicatedRel-17RAN4ledworkitemsincludingananalysisofregulationsinspectrumconsidered,whichbands3GPPshouldspecify,aswellaspotentialco-existencebetweenNRterrestrialandsatellite

4.2 ObjectiveofPerformancepartWI

NOTE: LeaveemptyiftheWIproposaldoesnotcontainaRANperformancepart.

SpecifynecessaryUEandnetworkperformancerequirementsforthespecifiedenhancements[RAN4].

SpecifyRRMtestandnetworkconformancetests[RAN4].

4.3 RANtimebudgetrequest(notapplicabletoRAN5WIs/SIs)

NOTE: ForallRANrelatedWIs/SIswhicharenotledbyRANWG5theWI/SIrapporteurhastofillouttheattachedExceltabletorequesttimebudgetsforcorrespondingRANWGmeetings.

TheExceltablehastobefilledoutforallaffectedRANWGsanduptothetargetdateoftheWI/SI.

Onetimeunit(TU)correspondsto~2hoursinthemeeting.

IfnoTUisneededleavethefieldemptyotherwiseenteranumberinthefield.

ForrevisionsofalreadyapprovedWI/SIdescriptions:PleaseremovetheExceltablefromtheWID/SID'szipfile.Thetimebudgetsarealreadyrecorded.Ifyouwanttomodifythem,thenthishastobedoneviathestatusreportandnotviaarevisedWID/SID.

IfthisWIDiscoveringCoreandPerformancepart,thenpleasefilloutonelineforeachofthemintheattachedExceltable.

SeeattachedExceltable.

5 ExpectedOutputandTimescale

Newspecifications{Onelineperspecification.Create/deletelinesasneeded}

ProposedSpecno.orseries

Type(seenote1)

Title

Forinfo

atTSG#

ForapprovalatTSG#

Remarks

Note1: OnlyTSsmaycontainnormativeprovisions.StudyItemsshallcreateorimpactonlyTRs.

"InternalTR"isintendedfor3GPPinternaluseonlywhereas"ExternalTR"maybetransposedbyOPs.

NOTE: IfthisisaRANWIDincludingCoreandPerf.part,thenallnewCorepartspecshavetobelistedfirstandthenallnewPerf.partspecs.Indicate"Corepart"or"Perf.part"underRemarksforeachspec.

Bydefaultanewspecscanonlybenewforoneofbothparts.

ImpactedexistingTS/TR

TS/TRNo.

Descriptionofchange

Targetcompletionplenary#

Remarks

TS38.211

NR;Physicalchannelsandmodulation

EnhancementonthePRACHsequenceand/orformat(inthecasepre-compensationoftimingandfrequencyoffsetisnotdoneatUEside)

TSG#90

Corepart

TS38.213

NR;Physicallayerproceduresforcontrol

EnhancementstoTimingAdvance,controlproceduressignalling

TSG#90

Corepart

TS38.214

NR;Physicallayerproceduresfordata

Timingrelationshipenhancements,EnhancementsonULtimeandfrequencysynchronization,

TSG#90

Corepart

TS38.300

NR;Overalldescription;Stage-2:

NTNstage2description

TSG#92

Corepart

TS38.304

NR;UserEquipment(UE)proceduresinidlemodeandinRRCInactivestate

Enhancetheidlemobilitytriggerconditions

TSG#92

Corepart

TS38.305

NGRadioAccessNetwork(NG-RAN);Stage2functionalspecificationofUserEquipment(UE)positioninginNG-RAN

NTNUEswithGNSScapabilities

TSG#92

Corepart

TS38.306

NR;UserEquipment(UE)radioaccesscapabilities

SupportofNTNUEcapabilities

TSG#92

Corepart

TS38.307

NR;RequirementsonUserEquipments(UEs)supportingarelease-independentfrequencyband

NTNrelease-independentfrequencybands

TSG#92

Corepart

TS38.321

NR;MediumAccessControl(MAC)protocolspecification:EnhanceRandomaccess,timingadvance,DRX,SchedulingRequest,HARQ

TSG#92

Corepart

TS38.322

NR;RadioLinkControl(RLC)protocolspecification

EnhanceStatusreportingandSequenceNumberandWindowSize

TSG#92

Corepart

TS38.323

NR;PacketDataConvergenceProtocol(PDCP)specification

EnhanceStatusreportingandSequenceNumberandSDUdiscard

TSG#92

Corepart

TS38.331

NR;RadioResourceControl(RRC);Protocolspecification

Enhanceidleandconnectedmodemobility,NTNspecificsysteminformationandRRCsignalling

TSG#92

Corepart

TS38.401

NG-RAN;Architecturedescription

NTNspecificfeatures

TSG#91

Corepart

TS38.410

NG-RAN;NGgeneralaspectsandprinciples

NTNspecificfeatures

TSG#91

Corepart

TS38.413

NG-RAN;NGApplicationProtocol(NGAP)

NTNspecificfeatures

TSG#91

Corepart

TS38.423

NG-RAN;NG-RAN;XnApplicationProtocol(XnAP)

NTNspecificfeatures

TSG#91

Corepart

TS38.133

NR;Requirementsforsupportofradioresourcemanagement

NTNspecificRRMfeatures

TSG#92

Corepart

TS38.104

NR;BaseStation(BS)radiotransmissionandreception

NTNspecificcharacteristics

TSG#92

Corepart

TS38.101-1

NR;UserEquipment(UE)radiotransmissionandreception,part1:Range1standalone

NTNspecificcharacteristics

TSG#92

Corepart

TS38.101-2

NR;UserEquipment(UE)radiotransmissionandreception,part2:Range2standalone

NTNspecificcharacteristics

TSG#92

Corepart

TS38.133

NR;Requirementsforsupportofradioresourcemanagement

NTNspecificRRMfeatures

TSG#94

Perfpart

TS38.101-4

NR;UserEquipment(UE)radiotransmissionandreception,part4:performancerequirements

NTNspecificcharacteristics

TSG#94

Perfpart

TS38.104

NR;BaseStation(BS)radiotransmissionandreception

NTNspecificcharacteristics

TSG#94

Perfpart

TS38.141-1

NR;BaseStation(BS)conformancetestingpart1

NTNspecific