V2X Simulation Requirements.docx
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V2X Simulation Requirements.docx
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V2XSimulationRequirements
AEvaluationmethodology
ForPC5-basedV2V,tradeoffbetweensystemandlinklevelperformancecanbestudied.Assumptiononthetargetlinkbudgetinlinklevelisasfollows:
–150minNLOSUrbancase
–320minFreewaycase
A.1Systemlevelsimulationassumptions
ForPC5-basedV2V,thefollowinggeneralassumptionsapply:
-EachvehicleUE’sreceptionissubjecttothehalfduplexconstraint.
A.1.1Evaluationscenarios
TwovehicleUEdroppingcasesaredefined:
UrbancaseandFreewaycase.SeeSectionA.1.2fortheUEdropandmobilitymodelineachcase.SeeSectionA.1.4forthechannelmodelineachcase.
MacroeNBmayormaynotbedeployedintheevaluations.Ifdeployed,theassumptionsinSectionA.1.3shouldbeused.Ifnot,simplewraparoundcanbeusedaslongasitisalignedwiththeevaluationassumptionsinthisTR.
DetailsofevaluationscenariosareinTableA.1.1.-1.
TableA.1.1-1:
Detailsofevaluationscenarios
Parameter
Assumption
CarrierfrequencyforPC5-basedV2V
6GHz,2GHz
Bandwidth
10MHz
Numberofcarriers
Onecarrierisbaseline.Othernumberscanbeevaluatedbasedoninter-carrierinterferencemodelfromtheexistingUE-UElinkACIR[28]dBaccordingto[5]fortheadjacentchannelcase.
Synchronization
Timeandfrequencyerrorshouldbeconsideredinsystemandlinklevelsimulations.Companiesshouldexplaintheassumederrormodelandthemethodtoachievetheerrorrange.UntilRAN4providesananswer,RAN1willassumeatleastthecasewherefrequencyerror(i.e.,errorintheoscillator)isintherangeof+-0.1PPM.
VehicleUEparameters
In-bandemission
In-bandemissionmodelinSectionA.2.1.5in[4]isreusedwith{W,X,Y,Z}={3,6,3,3}forsingleclusterSC-FDMA.
Antennaheight
1.5m
Antennapattern
Omni2D
Antennagain
3dBi
Maximumtransmitpower
23dBm
Numberofantennas
1TXand2RXantennas.Baselineisthat2RXantennasareseparatedbywavelength/2.
Noisefigure
9dB
A.1.2UEdropandmobilitymodel
VehicleUEsaredroppedontheroadsaccordingtospatialPoissonprocess.Thevehicledensityisdeterminedbytheassumptiononthevehiclespeed,andthevehiclelocationshouldbeupdatedevery100msinthesimulation.
InUrbancase,avehiclechangesitsdirectionattheintersectionasfollows:
-Gostraightwithprobability0.5
-Turnleftwithprobability0.25
-Turnrightwithprobability0.25
DetailsofvehicleUEdropandmobilitymodelforeachofUrbanandFreewaycasesareinTableA.1.2-1.FiguresA.1.2-1andA.1.2-2illustratetheroadconfigurationofthetwocases.
TableA.1.2-1:
DetailsofvehicleUEdropandmobilitymodel
Parameter
Urbancase
Freewaycase
Numberoflanes
2ineachdirection(4lanesintotalineachstreet)
3ineachdirection(6lanesintotalinthefreeway)
Lanewidth
3.5m
4m
Roadgridsizebythedistancebetweenintersections
433m*250m.Notethat3misreservedforsidewalkperdirection(i.e.,novehicleorbuildinginthisreservedspace)
N/A
Simulationareasize
Minimum[1299m*750m]
Freewaylength>=2000m.Wraparoundshouldbeappliedtothesimulationarea.
Vehicledensity
Averageinter-vehicledistanceinthesamelaneis2.5sec*absolutevehiclespeed.Baseline:
Thesamedensity/speedinallthelanesinonesimulation.
Absolutevehiclespeed
15km/h,60km/h
140km/h,70km/h
FigureA.1.2-1:
RoadconfigurationforUrbancase
FigureA.1.2-2:
RoadconfigurationforFreewaycase
A.1.3eNBandRSUdeployment
IfmacroeNBsaredeployedforUrbancase,ISDofmacroeNBis500mandthewraparoundmodelinFigureA.1.3-1isused.
IfmacroeNBsaredeployedforFreewaycase,
-Option1(baseline):
eNBsarelocatedalongthefreeway35mawaywith1732mISDinFigureA.1.3-2.
-Option2(optional):
Wraparoundmethodof19*3hexagonalcellswith500mISDinFigureA.1.3-3.
FigureA.1.3-1:
WraparoundmodelforUrbancase
FigureA.1.3-2:
Wraparoundmodeloption1(baseline)forFreewaycase
FigureA.1.3-3:
Wraparoundmodeloption2(optional)forFreewaycase
[Editor’snote:
AssumptionsonotherRSUdeployments(ifany)willbecapturedhere.]
FFSonhowtohandlemobilityandhandoverrelatedissue
A.1.4Channelmodel
AssumptionsforchannelbetweentwovehicleUEsareinTableA.1.4-1.
TableA.1.4-1:
Assumptionsforvehicle-to-vehiclechannel
Parameter
Urbancase
Freewaycase
Pathlossmodel
WINNER+B1Manhattangridlayout(notethattheantennaheightshouldbesetto1.5m.).Pathlossat3misusedifthedistanceislessthan3m.
LOSinWINNER+B1(notethattheantennaheightshouldbesetto1.5m.).Pathlossat3misusedifthedistanceislessthan3m.
Shadowingdistribution
Log-normal
Log-normal
Shadowingstandarddeviation
3dBforLOSand4dBforNLOS
3dB
Decorrelationdistance
10m
25m
Fastfading
NLOSinSectionA.2.1.2.1.1orA.2.1.2.1.2in[4]withfixedlargescaleparametersduringthesimulation.
Vehicle-to-vehiclechannelsareupdatedduringthesimulationasfollows:
•LetNbethenumberofvehicleUEinsystemsimulation
•Initialization(attime0)
•Nvehiclelocationsaregeneratedperagreeddropmodel
•PL(0)–NxNmatrixgeneratedaspervehiclelocationsandagreedchannelmodels
•Shadowing(inlogdomain):
S(0)–NxNi.i.d.(withtheexceptionthatshadowingbetweentwovehiclesshouldbethesameinthetwodirections)normalmatrixgeneratedasperagreedshadowingmodel
•Fading(0)–NxNi.i.d.processeswithacommondistribution
•Update(attime100*nms)
•Vehiclelocationsareupdatedasperagreedupdaterules
•PL(n)–NxNmatrixgeneratedasperupdatedvehiclelocations
•S(n)=exp(-D/D_corr).*S(n-1)+sqrt{(1-exp(-2*D/D_corr))}.*N_S(n)
•whereN_S(n)isanNxNi.i.d.(withtheexceptionthatshadowingbetweentwovehiclesshouldbethesameinthetwodirections)normalmatrixgeneratedaspertheagreedshadowingmodel
•DistheupdatedistancematrixwhereD(i,j)ischangeindistanceoflinkitojfromtimen-1totimen
•Fadingprocessisnotimpactedduetovehiclelocationupdates–fadingisonlyupdatedduetotime
•UEperformanceshouldreflectfastfadingvariationwithinthesubframe
AssumptionsforchannelbetweenaUEandamacroeNBinthecelllayoutinFiguresA.1.3-1,A.1.3-2,andA.1.3-3areinTableA.1.4-2.ForUrbancaseandoption2ofFreewaycase,assumptionsnotinTableA.1.4-2arethesameastheassumptionsof3GPPcase1inA.2.1.1.1in[7].Foroption1ofFreewaycase,assumptionsnotinTableA.1.4-2arethesameastheassumptionsof3GPPcase3inA.2.1.1.1in[7].
TableA.1.4-2:
AssumptionsforchannelbetweenUEandmacroeNB
Parameter
Assumption
Pathlossmodel
128.1+37.6log10(R),Rinkilometers
Penetrationloss
0dB
Shadowingdistribution
Log-normal
Shadowingstandarddeviation
8dB
Decorrelationdistance
50m
Fastfading
3GPPSpatialChannelModel(SCM)NLOSin[7]withfixedlargescaleparametersduringthesimulation.
Shadowingisupdatedasfollows:
•LetMbethenumberofeNBsites
•Initialization(attime0)
•Shadowing:
SeNB2UE,i(0)=R*Ni(0)
•RisaMxMmatrixtogenerateshadowingcorrelationbetweeneNBsites.
•AShadowingcorrelationfactorof0.5fortheshadowingbetweeneNBsitesandof1.0betweensectorsofthesameeNBsiteareused
•SeNB2UE,i(0):
Mx1shadowingvaluesbetweentheithUEandeNBsites
•Ni(0):
Mx1i.i.d.normalvectorgeneratedfortheithUE.
•Update(attime100*nms)
•UElocationsareupdatedasperA.1.2.
•SeNB2UE,i(n)=exp(-Di/D_corr).*SeNB2UE,i(n-1)+sqrt{(1-exp(-2*Di/D_corr))}.*(R*Ni(n))
•whereNi(n)isanMx1i.i.d.normalvectorfortheithUE.
•DidenotestheupdatedistancematrixfortheithUEwhereDi(k,k)ischangeindistanceoftheithUEtothektheNBsitefromtimen-1totimen.NotethatDiisadiagonalmatrix.
•D_corr=50m
A.1.5Trafficmodel
●TrafficmodelforV2V
Therearetwotrafficmodelsusedinevaluation:
PeriodictrafficcaseandEvent-triggeredtrafficcase.Periodictrafficcaseismandatory.Event-triggeredtrafficcasecanbeevaluatedoptionallywithorwithoutPeriodictraffic.
Everyvehicleinthesimulationgeneratesmessagesaccordingtothetrafficmodel.
ForPeriodictraffic,messagegenerationperiodsaredefinedinthefollowing5distinctivescenariosinTableA.1.5-1.
TableA.1.5-1:
MessagegenerationperiodforPeriodictraffic
Index
Vehicledroppingscenarios
Absolutevehiclespeed(km/h)
Messagegenerationperiod(ms)
1
Freeway
140
100
2
Freeway
70
100
3
Urban
60
100
4
Urban
15
100
5
Urban
15
500
ForPeriodictraffic,workingassumptionofmessagesizeisthatone300-bytemessagefollowedbyfour190-bytemessages,andthetimeinstanceof300-bytesizemessagegenerationisrandomizedamongvehicles.Notethatitisallowednottoconsidermessagesizeincalculatingtheperformancemetric.
ForEvent-triggeredtraffic,eventarrivalfollowsPoissonprocesswiththearrivalrateX(uptocompanychoice)persecondforeachvehicle.Onceeventtriggered,6messagesaregeneratedwithspaceof100ms.WorkingassumptionofmessagesizeforEvent-triggertrafficatL1is800bytes.
●Trafficmodelforxxx[Editornotes:
placeholderoftrafficmodelforV2I/N,V2PincasetheyaredifferentfromthatforV2V]
A.1.6Performancemetric
ForevaluationofproposedschemesforV2V,thefollowingmetric(s)shallbeconsidered.
•PacketReceptionRatio(PRR):
•ForoneTxpacket,thePRRiscalculatedbyX/Y,whereYisthenumberofUE/vehiclesthatlocatedintherange(a,b)fromtheTX,andXisthenumberofUE/vehicleswithsuccessfulreceptionamongY.CDFofPRRandthefollowingaveragePRRareusedinevaluation
•CDF
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