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How to Calculate Network Service Rate in omnet++

To calculate the network service rate in OMNeT++ has needs to evaluate how rapidly a node or network can process and serve requests or packets. The term service rate is usually expressed in packets per second (pps) or bits per second (bps) that liable on the level of granularity requirements. The given below are the detailed procedures on how to implement the network service rate in OMNeT++:

Steps to Calculate Network Service Rate in OMNeT++:

  1. Set Up the Network Model:
    • Describe the network topology in OMNeT++ using NED files that contains to setting up nodes, traffic generators, and the communication protocols we want to mimic.
  2. Generate Network Traffic:
    • Use traffic generators such as UdpApp, TcpApp, or custom applications to generate a steady stream of packets or requests that essential to be processed by the node or network.
  3. Track Packet Processing:
    • Track the number of packets that are processed or served by a node or network over a particular period and we need to monitor the time it takes to process these packets to compute the service rate.
  4. Calculate Service Rate:
    • The service rate can be calculated using the formula: Service Rate (pps)=Total Packets ProcessedTotal Time (seconds)\text{Service Rate (pps)} = \frac{\text{Total Packets Processed}}{\text{Total Time (seconds)}}Service Rate (pps)=Total Time (seconds)Total Packets Processed​
    • If you’re measuring the rate in terms of bits, use: Service Rate (bps)=Total Bits ProcessedTotal Time (seconds)\text{Service Rate (bps)} = \frac{\text{Total Bits Processed}}{\text{Total Time (seconds)}}Service Rate (bps)=Total Time (seconds)Total Bits Processed​

Example Implementation: Packet Service Rate Calculation

The given below is the detailed sample of how to calculate the service rate in OMNeT++:

#include <omnetpp.h>

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

using namespace omnetpp;

using namespace inet;

class ServiceRateModule : public cSimpleModule {

private:

int64_t totalPacketsProcessed;  // Total number of packets processed

int64_t totalBitsProcessed;     // Total number of bits processed

simtime_t startTime;            // Start time of the measurement period

simsignal_t serviceRatePpsSignal;  // Signal to record service rate in packets per second

simsignal_t serviceRateBpsSignal;  // Signal to record service rate in bits per second

protected:

virtual void initialize() override {

totalPacketsProcessed = 0;

totalBitsProcessed = 0;

startTime = simTime();

serviceRatePpsSignal = registerSignal(“serviceRatePpsSignal”);

serviceRateBpsSignal = registerSignal(“serviceRateBpsSignal”);

// Schedule the first packet processing

scheduleAt(simTime() + par(“processInterval”).doubleValue(), new cMessage(“processPacket”));

}

virtual void handleMessage(cMessage *msg) override {

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

// Simulate processing a packet

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

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

totalPacketsProcessed++;

totalBitsProcessed += bitsProcessed;

// Schedule the next packet processing

scheduleAt(simTime() + par(“processInterval”).doubleValue(), new cMessage(“processPacket”));

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 service rate in packets per second (pps)

double serviceRatePps = (totalTime > 0) ? (double)totalPacketsProcessed / totalTime.dbl() : 0.0;

emit(serviceRatePpsSignal, serviceRatePps);

// Calculate and emit service rate in bits per second (bps)

double serviceRateBps = (totalTime > 0) ? (double)totalBitsProcessed / totalTime.dbl() : 0.0;

emit(serviceRateBpsSignal, serviceRateBps);

EV << “Total Packets Processed: ” << totalPacketsProcessed << ” packets\n”;

EV << “Total Bits Processed: ” << totalBitsProcessed << ” bits\n”;

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

EV << “Service Rate: ” << serviceRatePps << ” pps (” << serviceRateBps / 1e6 << ” Mbps)\n”;

}

};

Define_Module(ServiceRateModule);

Explanation:

  • ServiceRateModule:
    • totalPacketsProcessed: Tracks the total number of packets processed during the simulation.
    • totalBitsProcessed: Tracks the total number of bits processed during the simulation.
    • startTime: Records the start time of the measurement period.
    • serviceRatePpsSignal and serviceRateBpsSignal: Register signals to emit the calculated service rate in packets per second and bits per second.
  • initialize() Function:
    • Initializes the counters and start time, and then schedules the first packet processing event.
  • handleMessage() Function:
    • To emulate the processing of packets and updates the counters for processed packets and bits. The processInterval parameter controls the time among processing events.
  • finish() Function:
    • At the end of the simulation, estimate the service rate in both packets per second and bits per second and the outcomes are emitted as signals and logged.
  1. Run the Simulation:
  • Compile and run OMNeT++ project. The simulation will monitor the number of packets and bits processed over time and compute the service rate.
  1. Analyse and Interpret Results:
  • The calculated service rate stretches to evaluate how efficiently the network or node can process the incoming traffic. Higher service rates designate the better performance and capacity to manage the traffic.

Additional Considerations:

  • Processing Delays: Make sure that the processInterval parameter reflects realistic processing delays that node or network might encounter.
  • Traffic Patterns: The traffic pattern like constant bit rate, bursty traffic can suggestively affect the service rate. Use traffic generators that fit the real-world scenarios.
  • Scalability: If simulating a large network, consider the scalability of service rate calculations to evade performance bottlenecks.

We demonstrate how the network service rate is calculated on the OMNeT++ tool that has generate the traffic then monitor the packet and calculate the service rate. We will also detail the approach taken to conduct the network service rate in various simulations.

We present the simulation performance outcomes regarding Network Service Rate utilizing the OMNeT++ tool. Should you desire a tailored research experience, we encourage you to contact us. Our team of experts, equipped with advanced tools, is prepared to support you in your research endeavors.

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