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How To Implement Satellite Communication in NS3

To implement satellite communication in ns-3, create a network topology which includes satellite nodes, ground station, and the necessary communication links. For simulating the satellite communication, ns-3 has a specifically module for satellite communication called satellite which provides the necessary components for the process. The following steps will guide to simulate basic satellite communication in ns-3.

Prerequisites

  • ns-3 installed on your system.
  • Basic understanding of ns-3 and C++ programming.

Steps-by-steps to Implement Satellite Communication in ns-3

  1. Install ns-3: Ensure you have ns-3 installed. You can download it from the official website and follow the installation instructions.

wget https://www.nsnam.org/release/ns-allinone-3.xx.tar.bz2

tar -xjf ns-allinone-3.xx.tar.bz2

cd ns-allinone-3.xx

./build.py –enable-examples –enable-tests

Include Necessary Headers: Include the required headers for satellite communication.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/mobility-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/satellite-module.h”

#include “ns3/applications-module.h”

Create Network Topology: Create nodes representing the satellite, ground stations, and any additional network elements.

NodeContainer groundStations;

groundStations.Create(2); // Create 2 ground station nodes

NodeContainer satellites;

satellites.Create(1); // Create 1 satellite node

Set Up Mobility Model: Configure the mobility model to simulate the movement of the satellite and ground stations.

MobilityHelper mobility;

// Set mobility for ground stations (static)

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(groundStations);

// Set mobility for the satellite (moving in a circular orbit)

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

positionAlloc->Add(Vector(0.0, 0.0, 700000.0)); // Example position for satellite

mobility.SetPositionAllocator(positionAlloc);

mobility.SetMobilityModel(“ns3::ConstantVelocityMobilityModel”);

mobility.Install(satellites);

Ptr<ConstantVelocityMobilityModel> cvmm = satellites.Get(0)->GetObject<ConstantVelocityMobilityModel>();

cvmm->SetVelocity(Vector(0.0, 7670.0, 0.0)); // Example velocity for satellite

Install Devices and Set Up Links: Set up the communication links between the ground stations and the satellite using point-to-point links.

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“1Gbps”));

pointToPoint.SetChannelAttribute(“Delay”, StringValue(“240ms”)); // Typical satellite link delay

NetDeviceContainer groundDevices;

NetDeviceContainer satelliteDevices;

for (uint32_t i = 0; i < groundStations.GetN(); ++i) {

    NetDeviceContainer link = pointToPoint.Install(NodeContainer(groundStations.Get(i), satellites.Get(0)));

    groundDevices.Add(link.Get(0));

    satelliteDevices.Add(link.Get(1));

}

Install Internet Stack: Install the internet stack on the nodes.

InternetStackHelper stack;

stack.Install(groundStations);

stack.Install(satellites);

Assign IP Addresses: Assign IP addresses to the devices.

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer groundInterfaces = address.Assign(groundDevices);

Ipv4InterfaceContainer satelliteInterfaces = address.Assign(satelliteDevices);

Create Applications: Create and install applications to simulate data transmission between the ground stations through the satellite.

uint16_t port = 9;

 

OnOffHelper onoff(“ns3::UdpSocketFactory”, Address(InetSocketAddress(groundInterfaces.GetAddress(1), port)));

onoff.SetConstantRate(DataRate(“1Mbps”));

ApplicationContainer app = onoff.Install(groundStations.Get(0));

app.Start(Seconds(1.0));

app.Stop(Seconds(10.0));

PacketSinkHelper sink(“ns3::UdpSocketFactory”, Address(InetSocketAddress(Ipv4Address::GetAny(), port)));

app = sink.Install(groundStations.Get(1));

app.Start(Seconds(0.0));

app.Stop(Seconds(10.0));

Run the Simulation: Finally, run the simulation and clean up.

Simulator::Stop(Seconds(10.0));

Simulator::Run();

Simulator::Destroy();

Example Complete Script

Below is an example complete script for setting up a basic satellite communication simulation in ns-3:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/mobility-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/satellite-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

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

{

    NodeContainer groundStations;

    groundStations.Create(2); // Create 2 ground station nodes

    NodeContainer satellites;

    satellites.Create(1); // Create 1 satellite node

    MobilityHelper mobility;

    // Set mobility for ground stations (static)

    mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

    mobility.Install(groundStations);

    // Set mobility for the satellite (moving in a circular orbit)

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

    positionAlloc->Add(Vector(0.0, 0.0, 700000.0)); // Example position for satellite

    mobility.SetPositionAllocator(positionAlloc);

    mobility.SetMobilityModel(“ns3::ConstantVelocityMobilityModel”);

    mobility.Install(satellites);

    Ptr<ConstantVelocityMobilityModel> cvmm = satellites.Get(0)->GetObject<ConstantVelocityMobilityModel>();

    cvmm->SetVelocity(Vector(0.0, 7670.0, 0.0)); // Example velocity for satellite

 

    PointToPointHelper pointToPoint;

    pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“1Gbps”));

    pointToPoint.SetChannelAttribute(“Delay”, StringValue(“240ms”)); // Typical satellite link delay

    NetDeviceContainer groundDevices;

    NetDeviceContainer satelliteDevices;

    for (uint32_t i = 0; i < groundStations.GetN(); ++i) {

        NetDeviceContainer link = pointToPoint.Install(NodeContainer(groundStations.Get(i), satellites.Get(0)));

        groundDevices.Add(link.Get(0));

        satelliteDevices.Add(link.Get(1));

    }

    InternetStackHelper stack;

    stack.Install(groundStations);

    stack.Install(satellites);

    Ipv4AddressHelper address;

    address.SetBase(“10.1.1.0”, “255.255.255.0”);

    Ipv4InterfaceContainer groundInterfaces = address.Assign(groundDevices);

    Ipv4InterfaceContainer satelliteInterfaces = address.Assign(satelliteDevices);

    uint16_t port = 9;

    OnOffHelper onoff(“ns3::UdpSocketFactory”, Address(InetSocketAddress(groundInterfaces.GetAddress(1), port)));

    onoff.SetConstantRate(DataRate(“1Mbps”));

 

    ApplicationContainer app = onoff.Install(groundStations.Get(0));

    app.Start(Seconds(1.0));

    app.Stop(Seconds(10.0));

    PacketSinkHelper sink(“ns3::UdpSocketFactory”, Address(InetSocketAddress(Ipv4Address::GetAny(), port)));

    app = sink.Install(groundStations.Get(1));

    app.Start(Seconds(0.0));

    app.Stop(Seconds(10.0));

    Simulator::Stop(Seconds(10.0));

    Simulator::Run();

    Simulator::Destroy();

    return 0;

}

Running the Script

We compile and run the script using the following commands:

./waf configure –enable-examples

./waf build

./waf –run <script-name>

Finally, satellite communication is set-up and simulated in ns-3, thus you can follow the above procedures or in case if you face any difficulties contact us.