LTE: Reg. SINR and RSRP values in simulation

[Vishnu Raj]

Hi,

I'm doing a simulation with a 1-cell scenario. I have 4 static UEs and 4 Mobile UEs. Static UEs are randomly allocated a fixed point. Mobile UEs are moving from the cell center to cell edge (moving outward in random direction).
After running the simulation, when I plot the RSRP and SINR values I'm getting vary high magnitude (Please see the figures below). I'm comparing the values with the ones given in http://usatcorp.com/faqs/understanding-lte-signal-strength-values/

The code is given below:

// Single Cell Test bed for LTE Cellular communications

/*

Run Commands:

1.  ./waf --run scratch/Lte1CellTestbed/Lte1CellTestbed --cwd scratch/Lte1CellTestbed/logs

2. ./waf --command-template="%s --ns3::ConfigStore::Filename=run.cfg --ns3::ConfigStore::Mode=Load --ns3::ConfigStore::FileFormat=RawText" --run "scratch/Lte1CellTestbed/Lte1CellTestbed" --cwd "scratch/Lte1CellTestbed/logs"

*/

#include <ns3/core-module.h>

#include <ns3/network-module.h>

#include <ns3/mobility-module.h>

#include <ns3/lte-module.h>

#include <ns3/config-store.h>

#include "progress-bar.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE( "Lte1CellTestbed" );

int main( int argc, char *argv[] ) {

    // Load experiment configuration

   CommandLine cmd;

   cmd.Parse( argc, argv );

   ConfigStore inputConfig;

   inputConfig.ConfigureDefaults();

   cmd.Parse( argc, argv );    

    // Position for Cell Tower -- aa points in 'm'

   double enbX = 0.00, enbY = 0.00, enbZ = 30.00;

   double cellRadius   = 1000.00;

    uint32_t nMobileUes = 4;

   uint32_t nStaticUes = 4;

    double simDuration    = 75.00;

   Time::SetResolution( Time::NS );

    // Create Nodes

   NodeContainer nodesEnb; nodesEnb.Create( 1 );

   NodeContainer nodesUesMobile;   nodesUesMobile.Create( nMobileUes );

   NodeContainer nodesUesStatic;   nodesUesStatic.Create( nStaticUes );

   NodeContainer nodesUes; nodesUes.Add( nodesUesMobile ); nodesUes.Add( nodesUesStatic );

    // Setup mobility models for eNodeBs and UEs

   // Setup mobility for eNodeB -- ConstantPositionMobilityModel

   Ptr<ListPositionAllocator> posAllocEnb = CreateObject<ListPositionAllocator>();

   posAllocEnb->Add( Vector(enbX,enbY,enbZ) );

   MobilityHelper mobilityHelperEnb;

   mobilityHelperEnb.SetMobilityModel( "ns3::ConstantPositionMobilityModel" );

   mobilityHelperEnb.SetPositionAllocator( posAllocEnb );

   mobilityHelperEnb.Install( nodesEnb );

   // Setup mobility for mobile UE nodes

   Ptr<UniformRandomVariable> wpRadSampler = CreateObject<UniformRandomVariable>();

   wpRadSampler->SetAttribute( "Max", DoubleValue(1.00*cellRadius) );

   wpRadSampler->SetAttribute( "Min", DoubleValue(0.98*cellRadius) );

   Ptr<ListPositionAllocator> posAllocUeMobile = CreateObject<ListPositionAllocator>();

   for( unsigned ueIdx = 0; ueIdx < nMobileUes; ueIdx++ ) {

       posAllocUeMobile->Add( Vector(enbX,enbY,1.5) );

   }

   Ptr<RandomDiscPositionAllocator> wpAllocUeMobile = CreateObject<RandomDiscPositionAllocator>();

   wpAllocUeMobile->SetX(enbX);    wpAllocUeMobile->SetX(enbY);    wpAllocUeMobile->SetRho(wpRadSampler);

   MobilityHelper mobilityHelperUeMobile;

   mobilityHelperUeMobile.SetMobilityModel( "ns3::RandomWaypointMobilityModel",

       "Speed", StringValue("ns3::ConstantRandomVariable[Constant=16.67]"),    // in 'm/s'

       "Pause", StringValue("ns3::ConstantRandomVariable[Constant=0.00]"),

       "PositionAllocator", PointerValue(wpAllocUeMobile) );

   mobilityHelperUeMobile.SetPositionAllocator( posAllocUeMobile );

   mobilityHelperUeMobile.Install( nodesUesMobile );

   // Setup mobility for static UEs

   Ptr<UniformDiscPositionAllocator> posAllocUeStatic  = CreateObject<UniformDiscPositionAllocator>();

   posAllocUeStatic->SetX(enbX);   posAllocUeStatic->SetY(enbY);   posAllocUeStatic->SetRho(cellRadius);

   MobilityHelper mobilityHelperUeStatic;

   mobilityHelperUeStatic.SetMobilityModel( "ns3::ConstantPositionMobilityModel" );

   mobilityHelperUeStatic.SetPositionAllocator( posAllocUeStatic );

   mobilityHelperUeStatic.Install( nodesUesStatic );

    // Setup LTE network

   Ptr<LteHelper> lteHelper    = CreateObject<LteHelper>();

   NetDeviceContainer devsEnb; devsEnb = lteHelper->InstallEnbDevice( nodesEnb );

   NetDeviceContainer devsUes; devsUes = lteHelper->InstallUeDevice( nodesUes );

   lteHelper->Attach( devsUes, devsEnb.Get(0) );

    // Activate saturation traffic

   enum EpsBearer::Qci q = EpsBearer::GBR_CONV_VOICE;

   EpsBearer bearer( q );

   lteHelper->ActivateDataRadioBearer( devsUes, bearer );

    // Enable Logging

   lteHelper->EnableTraces();

    // Setup simulation durtation

   Simulator::Stop( Seconds(simDuration) );

    // Setup Progress bar

   sim::ProgressBar progressBar( simDuration );

   progressBar.Enable();

    Simulator::Run();

    Simulator::Destroy();

    return 0;

}

I'm also attaching the full code folder with logs and plot script.

Where am I doing wrong??

With regards,
vish

[Tommaso Pecorella]

Hi,

how did you plot the values ?

I mean, practically all the reports use linear values. What are you using to plot them ?

T.

On Sunday, February 25, 2018 at 12:13:02 PM UTC-6, Vishnu Raj wrote:

Hi,

I'm doing a simulation with a 1-cell scenario. I have 4 static UEs and 4 Mobile UEs. Static UEs are randomly allocated a fixed point. Mobile UEs are moving from the cell center to cell edge (moving outward in random direction).
After running the simulation, when I plot the RSRP and SINR values I'm getting vary high magnitude (Please see the figures below). I'm comparing the values with the ones given in http://usatcorp.com/faqs/understanding-lte-signal-strength-values/

The code is given below:

[Vishnu Raj]

Hi,
I'm using 10 log(reported_snr) and 10 log( 1000 reported_rsrp)  plot.
The code for plotting is https://github.com/v-i-s-h/ns3-sketchbook/blob/master/Lte1CellTestbed/plot_DlStats.jl

Regards,
vish

[alyb...@gmail.com]

Hi Vishnu,

I am implementing a simular scenario but i have issue executing a .jl file in ubuntu to plot the SINR. Could you please help me ?

here is my email address alyb...@gmail.com.

Kind regards,

[Vishnu Raj]

Can you tell me what exactly is the problem?

Any error log/specific failure case will be useful.

[Aly Ba]

i cannot run the .jl file in ubuntu. i attached the error in terminal when i try to run your file.

Thank you so much for your response.

Regards,

Le lun. 7 janv. 2019 à 05:20, Vishnu Raj <ee14...@ee.iitm.ac.in> a écrit :

Can you tell me what exactly is the problem?

Any error log/specific failure case will be useful.

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[Vishnu Raj]

I wrote the code with Julia 0.6 and I think you may be using Julia 1.0

If you are in Julia 1.0, you can add 'using DelimitedFiles' at the top of the jl file and it should work (not tested).

More info at : https://docs.julialang.org/en/v1/stdlib/DelimitedFiles/

[Aly Ba]

Thank you, 

I will try 'using DelimitedFiles' if it doesn't work i will install julia 0.6

Is it correct to run the script like this:  $ julia <path of the jl file>    

[Aly Ba]

Hi Vishnu,

Now another error  with julia 0.6 , please check in the attached picture.

Thank you for the help

[Vishnu Raj]

I can't see any picture. Seem like you forgot to attach.

And to run, you should first go to 'Lte1CellTestbsd' folder (where the julia file is) and then run. This is because in line#11 of the jl file, I have given relative path from that specific folder (which will also have a logs folder where the outputs must be written to)

[Aly Ba]

Thank you for the response.

I executed the script without error nut a not seing any output in the log file, please see the attached figure.

regards,

Le lun. 7 janv. 2019 à 11:24, Vishnu Raj <ee14...@ee.iitm.ac.in> a écrit :

I can't see any picture. Seem like you forgot to attach.

And to run, you should first go to 'Lte1CellTestbsd' folder (where the julia file is) and then run. This is because in line#11 of the jl file, I have given relative path from that specific folder (which will also have a logs folder where the outputs must be written to)

--

[Vishnu Raj]

Oops..You can first start julia (just enter 'julia' in terminal, it should give 'julia>' prompt)

and then from Julia REPL, do 'include("plot_DlStats.jl")'

[Aly Ba]

Great !!

It works, thank you so much !

regards,

[abdul manan]

Hi Vishnu,

I am facing the same problem with very SINR values reported in dBm.

If you solved that issue, can you please guide me what is the cause for it?

Thanks