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# How to Calculate Data Rate in ns3

To calculate the data rate in ns3, we need to measure the amount of data transferred through the network in a given time. The data rate is typically expressed in bits per second (bps). Here is a interesting guide to calculate the data rate in ns3.

Steps for calculating data rate

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 traffic.
1. Trace the packets and collect metrics :
• To record the number of bytes transferred over a period of time, use ns3 tracing capabilities.
1. Calculate data rate :
• Based on the collected metrics, calculate the data rate.

Example of a simple data rate calculation

Create a basic network topology and measure the data rate by collecting the number of bytes transmitted over a fixed time interval.

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 (“DataRateExample”);

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 (“5Mbps”));

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

// Install link devices on nodes

NetDeviceContainer devices = pointToPoint.Install (nodes);

// Install the internet stack

InternetStackHelper stack;

stack.Install (nodes);

// Set up the UDP echo server on Node 1

uint16_t port = 9; // well-known echo port number

UdpEchoServerHelper echoServer (port);

ApplicationContainer serverApps = echoServer.Install (nodes.Get (1));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

// Set up the UDP echo client on Node 0

echoClient.SetAttribute (“MaxPackets”, UintegerValue (1000));

echoClient.SetAttribute (“Interval”, TimeValue (Seconds (0.01))); // 10 packets per second

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

ApplicationContainer clientApps = echoClient.Install (nodes.Get (0));

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

// Enable tracing

AsciiTraceHelper ascii;

pointToPoint.EnableAsciiAll (ascii.CreateFileStream (“data-rate-example.tr”));

// Set up flow monitor

FlowMonitorHelper flowmon;

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

// Run the simulation

Simulator::Run ();

// Calculate data rate

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 dataRate = (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 << “Data Rate: ” << dataRate << ” bps” << std::endl;

Simulator::Destroy ();

return 0;

}

Explanation

1. Simulation setup :

Two nodes are created. Those nodes are connected using a point-to-point link.

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 specified number of packets at a specified interval.

1. Packet tracing and Collect Metrics :

To count the total number of bytes received and the time of the first and last packets, use a FlowMonitor module.

1. Calculating data rate :

Calculate the data rate by dividing the total number of bits received by the total time of the transmission.

Step-by-step breakdown

1. Create Nodes and Links :

Two nodes are created. Those nodes are connected using a point-to-point link with a specified data rate and delay.

1. Install Internet Stack and Applications :

On the nodes, the Internet stack is installed and a UDP echo server and client are set up to generate and receive traffic.

1. Trace Packet Transmission and Reception :

To count the total number of bytes received and the time of the first and last packets, used a FlowMonitor module.

1. Calculate data rate :

The total number of bits received is calculated by multiplying the total number of bytes by 8. The data rate is calculated by dividing the total number of bits by the total time of the transmission.

In above summary, we conducted a performance review on determining the data rate in ns3 by quantifying the volume of data transferred across the network within a specified timeframe. Additionally, we provided complete details on the data rate.

For hassle-free services, reach out to ns3simulation.com’s developers with your specific requirements. We will proceed with a performance analysis by determining the Data Rate in ns3simulation. We will deliver the best results.