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# How to Calculate Network Capacity in ns3

To calculate network capacity in ns3, we need to determine the maximum data transfer rate that the network can support. This can be done by measuring the throughput of the network under various conditions. For the best results in your project about network capacity, contact ns3simulation.com.Here are the steps to calculate network capacity in ns3.

Steps for calculating network capacity

1. Set up the simulation :
• To simulate the network, create a network topology with nodes, protocols and links configured.
1. Install applications :
• On the nodes, setup applications to generate and receive traffic.
1. Trace the packets and network metrics :
• To record relevant metrics such as throughput, use ns3 tracing capabilities.
1. Analyze network capacity :
• To determine the network capacity, calculate the throughput.

Example of a simple network capacity calculation

Create a basic network topology with two nodes connected by a point-to-point link and measure the throughput to determine the network capacity.

set up the simulation

#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/flow-monitor-helper.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkCapacityExample”);

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

{

// Create two nodes

NodeContainer nodes;

nodes.Create (2);

// Set up the point-to-point link

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“100Mbps”));

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

// Install link devices on nodes

NetDeviceContainer devices;

devices = pointToPoint.Install (nodes);

// Install the internet stack

InternetStackHelper stack;

stack.Install (nodes);

// Set up a UDP server on Node 1

uint16_t port = 9;

UdpServerHelper server (port);

ApplicationContainer serverApp = server.Install (nodes.Get (1));

serverApp.Start (Seconds (1.0));

serverApp.Stop (Seconds (10.0));

// Set up a UDP client on Node 0 to send data to Node 1

client.SetAttribute (“MaxPackets”, UintegerValue (1000000));

client.SetAttribute (“Interval”, TimeValue (Seconds (0.00001))); // 10 microseconds interval

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

ApplicationContainer clientApp = client.Install (nodes.Get (0));

clientApp.Start (Seconds (2.0));

clientApp.Stop (Seconds (10.0));

// Set up flow monitor

FlowMonitorHelper flowmon;

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

// Run the simulation

Simulator::Run ();

// Calculate network capacity

monitor->CheckForLostPackets ();

Ptr<Ipv4FlowClassifier> classifier = DynamicCast<Ipv4FlowClassifier> (flowmon.GetClassifier ());

std::map<FlowId, FlowMonitor::FlowStats> stats = monitor->GetFlowStats ();

double totalTime = 0;

for (std::map<FlowId, FlowMonitor::FlowStats>::const_iterator i = stats.begin (); i != stats.end (); ++i)

{

Ipv4FlowClassifier::FiveTuple t = classifier->FindFlow (i->first);

if (t.destinationPort == port)

{

totalTime += i->second.timeLastRxPacket.GetSeconds () – i->second.timeFirstTxPacket.GetSeconds ();

}

}

double throughput = (totalBytesReceived * 8) / totalTime; // Convert bytes to bits

std::cout << “Total Bytes Received: ” << totalBytesReceived << ” bytes” << std::endl;

std::cout << “Total Time: ” << totalTime << ” seconds” << std::endl;

std::cout << “Throughput: ” << throughput << ” bps” << std::endl;

Simulator::Destroy ();

return 0;

}

1. Install applications

In the above example, on Node 1 a UDP echo server is installed. and on Node 0, a UDP echo client is installed. The client sends a large number of packets to the server.

1. Trace the packets and Network Metrics

To collect statistics such as the number of bytes received and the time of the first and last packets, The FlowMonitor module is used.

1. Analyze Network Capacity

By measuring the throughput, which is the total amount of data received over the total time of the transmission, network capacity is calculated.

Explanation

1. Simulation setup :

Two nodes are created. Those nodes are connected using a point-to-point link with a data rate of 100Mbps and a delay of 2ms.

1. Application setup :

On Node 1, a UDP echo server is installed. and On Node 0, a UDP echo client is installed. Configure the client to send a large number of packets at a very short interval.

1. Packet tracing and Network Metrics :

To collect statistics such as the number of bytes received and the time of the first and last packets, use a FlowMonitor module.

1. Analyze network capacity :

Calculate the throughput by dividing the total number of bits received by the total time of the transmission. This throughput represents the network capacity.

On the whole, we had an analysis on calculating network capacity in ns3 by determining the maximum data transfer rate that the network can support. Also, we provide an overview on Network capacity.

The team at ns3simulation is thrilled to provide network performance advice for your project. We perform a detailed performance analysis. Additionally, we are offering comprehensive guidance on figuring out network capacity in ns3 simulation.