How to Calculate Network Data Rate in omnet++

To calculate the network data rate in OMNeT++ has requires to involve calculating the amount of data transmitted over the network per unit of time. The data rate is usually stated in bits per second in bps and can be evaluated for a particular link, node, or the total network. This is repeatedly denoted to as throughput or bandwidth utilization.

Steps to Calculate Network Data Rate in OMNeT++:

1. Set Up the Network Model:
   • Define the network topology in OMNeT++ using NED files. It encompasses setting up nodes, links with particular data rates, and configuring any related traffic generation applications.
2. Generate Network Traffic:
   • Use traffic generators, like UdpApp, TcpApp, or custom modules, to make network traffic that will be communicated across the network.
3. Track Data Transmission:
   • Track the amount of data sent over the network or through particular links. We require to calculate the number of bits or bytes transmitted during a specific period.
4. Calculate Data Rate:
   • The data rate can be calculated using the formula is Data Rate=Total Data Transmitted (in bits)Total Time (in seconds)\text{Data Rate} = \frac{\text{Total Data Transmitted (in bits)}}{\text{Total Time (in seconds)}}Data Rate=Total Time (in seconds)Total Data Transmitted (in bits)​
   • This will provide the average data rate over the measurement period.

Example Implementation: Measuring Data Rate

Given below is an example to calculate the data rate in OMNeT++:

#include <omnetpp.h>

#include “inet/common/packet/Packet.h”

using namespace omnetpp;

using namespace inet;

class DataRateModule : public cSimpleModule {

private:

int64_t totalBitsSent;  // Total number of bits sent across the network

simtime_t startTime;    // Start time of the measurement period

simsignal_t dataRateSignal;  // Signal to record data rate

protected:

virtual void initialize() override {

totalBitsSent = 0;

startTime = simTime();

dataRateSignal = registerSignal(“dataRateSignal”);

// Schedule the first packet transmission

scheduleAt(simTime() + par(“sendInterval”).doubleValue(), new cMessage(“sendPacket”));

}

virtual void handleMessage(cMessage *msg) override {

if (strcmp(msg->getName(), “sendPacket”) == 0) {

// Create and send a packet

Packet *packet = new Packet(“dataPacket”);

int packetSize = par(“packetSize”).intValue();  // in bytes

int64_t bitsSent = packetSize * 8;  // Convert to bits

totalBitsSent += bitsSent;

send(packet, “out”);

// Schedule the next packet transmission

scheduleAt(simTime() + par(“sendInterval”).doubleValue(), new cMessage(“sendPacket”));

delete msg;

} else {

delete msg;

}

}

virtual void finish() override {

// Calculate the total time elapsed

simtime_t endTime = simTime();

simtime_t totalTime = endTime – startTime;

// Calculate and emit data rate (bits per second)

double dataRate = (totalTime > 0) ? (double)totalBitsSent / totalTime.dbl() : 0.0;

emit(dataRateSignal, dataRate);

EV << “Total Bits Sent: ” << totalBitsSent << ” bits\n”;

EV << “Total Simulation Time: ” << totalTime << ” seconds\n”;

EV << “Calculated Data Rate: ” << dataRate / 1e6 << ” Mbps\n”;

}

};

Define_Module(DataRateModule);

Explanation:

• DataRateModule:
  • totalBitsSent: During the simulation, tracks the total number of bits sent
  • startTime: Notes the start time of the measurement period.
  • dataRateSignal: Registers a signal to emit the measured data rate at the end of the simulation.
• initialize() Function:
  • Initializes the total bits sent and start time, then lists the first packet transmission.
• handleMessage() Function:
  • Handles sending packets and updates the totalBitsSent counter based on the size of each packet sent.
• finish() Function:
  • Calculates the total data rate by dividing the total bits sent by the entire simulation time at the end of the simulation,. The result is emitted as a signal and logged.

5. Run the Simulation:

• Compile and run the OMNeT++ project. The simulation will follow the total bits sent and the time taken, permitting to determine the average data rate.

6. Analyse and Interpret Results:

• The calculated data rate delivers a measure of the network’s performance, representing how much data the network can manage over time. Higher data rates indicate more effective utilization of network resources.

Additional Considerations:

• Link-Specific Data Rate: If we are interested in the data rate of a specific link, we can change the module to monitor packets only on that link.
• Traffic Patterns: The data rate can different depending on the traffic pattern. Make sure the traffic generator is set up to reflect the expected network conditions.
• Congestion and Overhead: Realize that network congestion and protocol overhead can reduce the efficient data rate.

Overall, we had shown network model, data transmission, network traffic, and example. We had execute how to calculate the Network Data Rate in the tool OMNeT++. We will provide further details as per your needs.

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