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How to Calculate Network Transmission Speed in omnet++

To calculate the network transmission speed in OMNeT++ has encompasses to determine the rate at which data is routed across a network link that commonly evaluate in bits per second (bps). Transmission speed usually refer as to throughput, is a necessary metric for measure the network performance.

Steps to Calculate Network Transmission Speed in OMNeT++:

  1. Set Up the Network Model:
    • Describe network topology using NED files in OMNeT++ that contain nodes like routers, switches, or wireless access points, and configure the communication links among them.
  2. Implement Packet Transmission Logic:
    • Make sure that network model manage packet transmission using modules such as EthernetInterface, Ieee80211Interface, or custom modules. The data packets being routed will be the simple for calculating transmission speed.
  3. Track Data Transmission:
    • Observe the number of bits or packets routed over a particular link or interface during the simulation. This can be completed by counting the number of bits in the packets that are successfully transmitted.
  4. Measure Time Interval:
    • Track the time interval over which the data transmission occurs. This is usually completed by noting the initial and end point of the transmission or by occasionally validate the transmission speed.
  5. Calculate Transmission Speed:
    • Transmission speed (throughput) can be estimated using the formula: Transmission Speed=Total Bits TransmittedTime Interval (seconds)\text{Transmission Speed} = \frac{\text{Total Bits Transmitted}}{\text{Time Interval (seconds)}}Transmission Speed=Time Interval (seconds)Total Bits Transmitted​
    • The outcome is commonly expressed in bits per second (bps), kilobits per second (kbps), or megabits per second (Mbps).
  6. Log or Analyse Transmission Speed:
    • During the simulation, log the transmission speed occasionally or compute it at the end of the simulation to study the performance of the network link.

Example Implementation: Transmission Speed Calculation

The given below is the sample on how to calculate the transmission speed in OMNeT++ using the INET framework:

#include <omnetpp.h>

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

using namespace omnetpp;

using namespace inet;

class TransmissionSpeedModule : public cSimpleModule {

private:

int64_t totalBitsTransmitted;        // Total bits transmitted

simtime_t startTime;                 // Start time of the measurement period

simsignal_t transmissionSpeedSignal; // Signal to record transmission speed

protected:

virtual void initialize() override {

totalBitsTransmitted = 0;

startTime = simTime();

transmissionSpeedSignal = registerSignal(“transmissionSpeedSignal”);

// Schedule the first transmission speed calculation

scheduleAt(simTime() + par(“checkInterval”).doubleValue(), new cMessage(“calculateTransmissionSpeed”));

}

virtual void handleMessage(cMessage *msg) override {

if (msg->isPacket()) {

Packet *packet = check_and_cast<Packet *>(msg);

int packetSizeBits = packet->getBitLength();  // Get the size of the packet in bits

// Update the total bits transmitted

totalBitsTransmitted += packetSizeBits;

// Forward the packet to the next module

send(packet, “out”);

} else if (strcmp(msg->getName(), “calculateTransmissionSpeed”) == 0) {

// Calculate the elapsed time

simtime_t endTime = simTime();

simtime_t totalTime = endTime – startTime;

// Calculate transmission speed (bps)

double transmissionSpeed = (totalTime > 0) ? totalBitsTransmitted / totalTime.dbl() : 0.0;

// Emit the transmission speed signal

emit(transmissionSpeedSignal, transmissionSpeed);

EV << “Transmission Speed: ” << transmissionSpeed / 1e6 << ” Mbps\n”;

// Schedule the next transmission speed calculation

scheduleAt(simTime() + par(“checkInterval”).doubleValue(), msg);

} else {

delete msg;

}

}

virtual void finish() override {

// Calculate the final transmission speed at the end of the simulation

simtime_t totalTime = simTime() – startTime;

double transmissionSpeed = (totalTime > 0) ? totalBitsTransmitted / totalTime.dbl() : 0.0;

EV << “Final Transmission Speed: ” << transmissionSpeed / 1e6 << ” Mbps\n”;

}

};

Define_Module(TransmissionSpeedModule);

Explanation:

  • TransmissionSpeedModule:
    • totalBitsTransmitted: A counter that tracks the total number of bits transmitted during the simulation.
    • startTime: Records the start time of the measurement period.
    • transmissionSpeedSignal: Registers a signal to emit the calculated transmission speed for logging or analysis.
  • initialize() Function:
    • Initializes the counters and schedules the first calculation of transmission speed.
  • handleMessage() Function:
    • Packet Handling: When a packet is received, the module updates the total bits transmitted and forwards the packet.
    • calculateTransmissionSpeed: To compute the transmission speed based on the total bits transmitted and the elapsed time. The speed is then produced as a signal and logged.
  • finish() Function:
    • Logs the final transmission speed at the end of the simulation.
  1. Run the Simulation:
  • Compile and run OMNeT++ project. The simulation will monitor and log the transmission speed that deliver the insights into the performance of the network link.
  1. Analyse and Interpret Results:
  • The transmission speed metric gives you insights into how quickly the information is being transmitted over the network link. Higher transmission speeds designate better link performance, while lower speeds might recommended the congestion or other difficulties.

Additional Considerations:

  • Dynamic Traffic: If the network traffic is dynamic, consider to measure how the transmission speed changes over time and under diverse network conditions.
  • Multiple Links: If network has multiple links, we want to monitor and compare the transmission speed across various links to measure their relative performance.
  • Protocol Overhead: Be aware that protocol overhead like headers, control messages can impact the efficiency of transmission speed. Consider this when measuring the outcome.

We demonstrate how to calculate the network transmission speed in OMNeT++ tool that has setup and configure the network model then apply the packet transmission logic then analyse the results. We plan to provide more details about network transmission speed.

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