How to Implement network Mobility Control in ns3

To implement the network mobility control in the ns3, we have to create a network simulation in which the nodes can be able to move based on the certain mobility models. We can control the node movements, modernize their positions and also simulate situations where the mobility is a key feature like vehicular networks, mobile ad hoc networks or any other environment. Here, we offer the detailed process of the network mobility in ns3:

Step-by-Step Implementation:

Step 1: Setup ns3 Environment

Make certain, ns3 is installed and properly configured in the system.

Step 2: Include Necessary Modules

In the script, we have to take account of  the necessary ns3 modules:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

#include “ns3/applications-module.h”

#include “ns3/mobility-module.h”

#include “ns3/flow-monitor-module.h”

Step 3: Create the Simulation Script

  1. Setup Nodes and Network:

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“MobilityControlExample”);

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (4);

// Create point-to-point links

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“10Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

NetDeviceContainer devices;

devices = pointToPoint.Install (nodes.Get (0), nodes.Get (1));

devices = pointToPoint.Install (nodes.Get (1), nodes.Get (2));

devices = pointToPoint.Install (nodes.Get (2), nodes.Get (3));

// Install Internet stack

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Set up mobility

MobilityHelper mobility;

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

mobility.Install (nodes);

Ptr<ConstantPositionMobilityModel> mob = nodes.Get(0)->GetObject<ConstantPositionMobilityModel>();

mob->SetPosition(Vector(0.0, 0.0, 0.0));

mob = nodes.Get(1)->GetObject<ConstantPositionMobilityModel>();

mob->SetPosition(Vector(10.0, 0.0, 0.0));

mob = nodes.Get(2)->GetObject<ConstantPositionMobilityModel>();

mob->SetPosition(Vector(20.0, 0.0, 0.0));

mob = nodes.Get(3)->GetObject<ConstantPositionMobilityModel>();

mob->SetPosition(Vector(30.0, 0.0, 0.0));

// Set up applications

uint16_t port = 9;  // Discard port (RFC 863)

// Server application on node 3

Address serverAddress (InetSocketAddress (Ipv4Address::GetAny (), port));

PacketSinkHelper packetSinkHelper (“ns3::UdpSocketFactory”, serverAddress);

ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (3));

sinkApps.Start (Seconds (1.0));

sinkApps.Stop (Seconds (20.0));

// Client application on node 0

OnOffHelper onoff (“ns3::UdpSocketFactory”, Address (InetSocketAddress (interfaces.GetAddress (3), port)));

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

ApplicationContainer apps = onoff.Install (nodes.Get (0));

apps.Start (Seconds (2.0));

apps.Stop (Seconds (20.0));

// Flow monitor

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll ();

Simulator::Stop (Seconds (20.0));

Simulator::Run ();

monitor->SerializeToXmlFile(“flowmon-results.xml”, true, true);

Simulator::Destroy ();

return 0;

}

Step 4: Run the Simulation

Compile and run your simulation script:

./waf configure

./waf build

./waf –run MobilityControlExample

Explanation

  • Node Creation: Create nodes representing different devices in the network.
  • Point-to-Point Links: Configure point-to-point links between nodes.
  • Internet Stack: Install the Internet stack on all nodes.
  • IP Configuration: Allocate IP addresses to the nodes.
  • Mobility: On the nodes, we have to install the mobility model with the help of MobilityHelper. For instance, to set the static positions we can use  ConstantPositionMobilityModel and if needed, we can alter their positions.
  • Applications: Simulate the traffic amongst the nodes using OnOffApplication and PacketSink.
  • Flow Monitor: Use the flow monitor to accumulate traffic data and save them as an XML file for analysis.

Advanced Mobility Control Techniques

  1. Random Walk Mobility:

Use the RandomWalk2dMobilityModel to simulate random movement of nodes.

MobilityHelper mobility;

mobility.SetMobilityModel (“ns3::RandomWalk2dMobilityModel”,

“Bounds”, RectangleValue (Rectangle (0, 50, 0, 50)));

mobility.Install (nodes);

  1. Constant Velocity Mobility:

We have to pretend that the nodes are moving at a continuous speed by using  ConstantVelocityMobilityModel.

MobilityHelper mobility;

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

mobility.Install (nodes);

Ptr<ConstantVelocityMobilityModel> mob = nodes.Get(0)->GetObject<ConstantVelocityMobilityModel>();

mob->SetVelocity(Vector(1.0, 0.0, 0.0));

  1. Gauss-Markov Mobility:

Use the GaussMarkovMobilityModel for more realistic mobility patterns.

MobilityHelper mobility;

mobility.SetMobilityModel (“ns3::GaussMarkovMobilityModel”,

“Bounds”, BoxValue (Box (0, 50, 0, 50, 0, 50)),

“TimeStep”, TimeValue (Seconds (0.5)),

“Alpha”, DoubleValue (0.85),

“MeanVelocity”, StringValue (“ns3::UniformRandomVariable[Min=20|Max=30]”),

“MeanDirection”, StringValue (“ns3::UniformRandomVariable[Min=0|Max=6.28318]”),

“MeanPitch”, StringValue (“ns3::UniformRandomVariable[Min=0|Max=1.570796]”));

mobility.Install (nodes);

  1. Waypoint Mobility:

We should make the nodes to follow by defining the certain waypoints using WaypointMobilityModel.

MobilityHelper mobility;

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

mobility.Install (nodes);

Waypoint waypoint1 (Seconds (1.0), Vector (10.0, 0.0, 0.0));

Waypoint waypoint2 (Seconds (2.0), Vector (20.0, 0.0, 0.0));

Ptr<WaypointMobilityModel> waypointMob = nodes.Get(0)->GetObject<WaypointMobilityModel>();

waypointMob->AddWaypoint (waypoint1);

waypointMob->AddWaypoint (waypoint2);

In this script, we thoroughly go through the provided materials about how to implement the network mobility control in the ns3 tool. if you need any details about mobility control or anything, we will offer them through another script.

We have effectively implemented network Mobility Control in the ns3 program, managing node movements, updating their positions, and simulating scenarios related to your projects. Reach out to us for your success!