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# How to Calculate Network Size in Ns3

To calculate the network size in ns3, we need to determine the number of nodes in a network and understand the geographical or logical extent of the network. The network size can be defined in terms of the number of nodes and the area they cover or the topology they form. Here are the steps to calculate and visualize the network size in ns3.

Steps for calculation

1. Set up your ns3 :
• Make sure that ns3 is installed in the computer. If not, install it.

1. Create a new ns3 script :
• In the scratch directory of ns3, create a new script.

1. Include necessary libraries :
• In your script, include the necessary libraries.

1. Define network topology :
• For your network topology, create multiple nodes.
1. Implement Network Size Calculation Logic :
• Keep track of the number of nodes and their geographical positions.

1. Running the Simulation :
• Define the simulation time and run the simulation.

Example for calculating network size in ns3

Here is the example for the calculation of network size :

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/wifi-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkSizeExample”);

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

{

uint32_t nNodes = 10; // Number of nodes

double simulationTime = 10.0; // Simulation time in seconds

CommandLine cmd;

cmd.AddValue(“nNodes”, “Number of nodes”, nNodes);

cmd.AddValue(“simulationTime”, “Total simulation time”, simulationTime);

cmd.Parse(argc, argv);

NodeContainer nodes;

nodes.Create(nNodes);

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.SetChannel(channel.Create());

WifiHelper wifi = WifiHelper::Default();

wifi.SetRemoteStationManager(“ns3::AarfWifiManager”);

WifiMacHelper mac;

Ssid ssid = Ssid(“ns-3-ssid”);

mac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid), “ActiveProbing”, BooleanValue(false));

NetDeviceContainer devices = wifi.Install(phy, mac, nodes);

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,

“MinX”, DoubleValue(0.0),

“MinY”, DoubleValue(0.0),

“DeltaX”, DoubleValue(5.0),

“DeltaY”, DoubleValue(5.0),

“GridWidth”, UintegerValue(5),

“LayoutType”, StringValue(“RowFirst”));

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

mobility.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(0));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(simulationTime));

echoClient.SetAttribute(“MaxPackets”, UintegerValue(1));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(nodes.Get(nNodes – 1));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(simulationTime));

Simulator::Stop(Seconds(simulationTime));

Simulator::Run();

// Calculate and print network size

Ptr<MobilityModel> mobilityModel;

Vector position;

double minX = std::numeric_limits<double>::max();

double minY = std::numeric_limits<double>::max();

double maxX = std::numeric_limits<double>::lowest();

double maxY = std::numeric_limits<double>::lowest();

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

{

mobilityModel = nodes.Get(i)->GetObject<MobilityModel>();

position = mobilityModel->GetPosition();

if (position.x < minX) minX = position.x;

if (position.y < minY) minY = position.y;

if (position.x > maxX) maxX = position.x;

if (position.y > maxY) maxY = position.y;

}

double networkWidth = maxX – minX;

double networkHeight = maxY – minY;

std::cout << “Number of nodes: ” << nNodes << std::endl;

std::cout << “Network width: ” << networkWidth << ” meters” << std::endl;

std::cout << “Network height: ” << networkHeight << ” meters” << std::endl;

Simulator::Destroy();

return 0;

}

Explanation

1. Nodes and links :

Nodes are created. Wi-Fi network is configured for communication.

1. Mobility :

To place the nodes in a grid layout, a grid position allocator is configured. To keep the nodes stationary, ConstantPositionMobilityModel is used.

1. Applications :

On one node, a UDP echo server is installed. and On another node, a UDP echo server is installed to generate traffic.

1. Network size calculation logic :

To find their positions, iterated through all the nodes. To determine the network width and height, calculated the minimum and maximum x and y.

1. Running the Simulation :

The simulation runs. Network size is calculated and printed, after the simulation.

Overall, we had successfully learned on calculating network size in ns3 by simulating the transmission of multimedia data, collecting relevant Quality of Service (QoS) metrics such as delay, jitter, and packet loss, and then mapping these metrics to MOS values using a suitable model. Share with us your parameters to calculate the network size in ns3 we guarantee best results and provide proper comparative analysis.