StochasticChannelModel preset with the propagation formulas of 3GPP TR 38.901, "Study on channel model for frequencies from 0.5 to 100 GHz", v16.1.0, December 2019. It differs from its base type only in the pathLossType default; there is no C++ class of its own behind the name. Note that the study supplies the path loss, LOS probability, shadowing and angular attenuation only; the rest of the link model is the same for every propagation study.

This is the default channel model of the gNodeB NIC and of the NR side of the NR UE NIC.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends

Name	Type	Description
StochasticChannelModel	simple module	The full PHY link model: everything between a transmitted air frame and the decision on whether it was received. The channel impairments are modeled statistically -- drawn from the distributions of a 3GPP propagation study, rather than computed from the geometry of an actual environment -- which is what sets this model apart from IdealChannelModel, where there are no impairments at all, only a configured packet error rate.

Parameters

Name	Type	Default value	Description
binderModule	string	"binder"
cellInfoModule	string	"^.^.cellInfo"	Optional
componentCarrierModule	string	"carrierAggregation.componentCarrier[0]"	Component carrier for this channel model
pathLossType	string	"Tr38901"	Which 3GPP propagation study supplies the path loss formulas
shadowing	bool	true	Enable/disable shadowing
scenario	string	"URBAN_MACROCELL"	Path loss scenario, in ITU terminology
nodebHeight	double	25m	eNodeB height
buildingHeight	double	20m	Building height
insideBuilding	bool	false	Determines if the UE is inside a building
useBuildingPenetrationHighLossModel	bool	false	Enable the high-loss building penetration model (table 7.4.3-2 in TR 38.901); only used with pathLossType="Tr38901"
streetWidth	double	20m
ueHeight	double	1.5m
tolerateMaxDistViolation	bool	false
useTorus	bool	false
correlationDistance	double	50m
targetBler	double	0.01	Target BLER used to compute feedback
harqReduction	double	0.2	Factor the error probability is multiplied by for each HARQ retransmission
antennaGainUe	double	0dBi	Antenna gain of the UE
antennGainEnB	double	18dBi	Antenna gain of the eNodeB
antennGainMicro	double	5dBi	Antenna gain of the micro node
thermalNoise	double	-104.5dBm	Thermal noise for 10 MHz of bandwidth
ueNoiseFigure	double	7dBm	UE noise figure
bsNoiseFigure	double	5dBm	eNodeB noise figure
cableLoss	double	2dB	Cable loss
dynamicLos	bool	false	Whether LOS/NLOS is drawn per link from the scenario's LOS probability; when false, it is fixed to fixedLos
fixedLos	bool	false	LOS state of every link when dynamicLos is false: true = LOS, false = NLOS
fading	bool	true	Enable/disable fading
fadingType	string	"JAKES"	Fading type (JAKES or RAYLEIGH)
numFadingPaths	int	6	If Jakes fading, this parameter specifies the number of paths (tap channel)
delayRms	double	363ns
bgCellInterference	bool	true	Whether interference from background cells is included in the SINR, in both UL and DL
extCellInterference	bool	true	Whether interference from external cells is included in the DL SINR (TODO possibly obsolete)
downlinkInterference	bool	false	Whether interference from other base stations is included in the DL SINR
uplinkInterference	bool	false	Whether interference from the UEs of other cells is included in the UL SINR
enableExtCellLos	bool	true
collectSinrStatistics	bool	true	Collection of SINR statistics can be disabled because it might be quite time-consuming

Properties

Name	Value	Description
display	i=block/classifier2
class	StochasticChannelModel

Signals

Name	Type	Unit	Description
rcvdSinrDl			Statistics
rcvdSinrUl
measuredSinrDl
measuredSinrUl

Statistics

Name	Title	Source	Record	Unit	Interpolation Mode	Description
rcvdSinrDl	SINR measured at packet reception, DL	rcvdSinrDl	mean, vector	dB
rcvdSinrUl	SINR measured at packet reception, UL	rcvdSinrUl	mean, vector	dB
measuredSinrDl	SINR measured at feedback computation, DL	measuredSinrDl	mean, vector	dB
measuredSinrUl	SINR measured at feedback computation, UL	measuredSinrUl	mean, vector	dB

Source code

//
// ~StochasticChannelModel preset with the propagation formulas of
// 3GPP TR 38.901, "Study on channel model for frequencies from 0.5 to 100 GHz",
// v16.1.0, December 2019. It differs from its base type only in the
// pathLossType default; there is no C++ class of its own behind the name. Note
// that the study supplies the path loss, LOS probability, shadowing and angular
// attenuation only; the rest of the link model is the same for every
// propagation study.
//
// This is the default channel model of the gNodeB NIC and of the NR side of the
// NR UE NIC.
//
simple Tr38901ChannelModel extends StochasticChannelModel
{
    parameters:
        pathLossType = default("Tr38901");
}

File: src/simu5g/stack/phy/channelmodel/Tr38901ChannelModel.ned

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