How to Calculate Network Packet delivery ratio in omnet++

To calculate the network packet delivery ratio in OMNeT++ has several steps that the packet delivery ratio (PDR) is the critical parameters that evaluate the success rate of packet transmission in a network and it is defined as the ratio of the number of packets successfully received by the destination to the number of packets sent by the source. The PDR is usually expressed as a percentage.

The below are the procedures on how to calculate the packet delivery ration in OMNeT++:

Steps to Calculate Packet Delivery Ratio (PDR) in OMNeT++:

1. Set Up the Network Model:
   • Describe network topology using NED files in OMNeT++ and that includes to generating the nodes like a sender and a receiver and connecting them with suitable links.
2. Implement Traffic Generation:
   • Use modules alike UdpApp, TcpApp, or custom traffic generators to mimic the data traffic in network and make sure those packets are sent from the source node to the destination node.
3. Track Sent and Received Packets:
   • To compute the PDR, we need to monitor the total number of packets sent by the source and the total number of packets received by the destination.
4. Calculate PDR:
   • The PDR can be calculated using the formula: PDR=Total Packets ReceivedTotal Packets Sent×100%\text{PDR} = \frac{\text{Total Packets Received}}{\text{Total Packets Sent}} \times 100\%PDR=Total Packets SentTotal Packets Received​×100%

Example Implementation:

The below is the sample of how to calculate the Packet Delivery Ratio in OMNeT++:

#include <omnetpp.h>

using namespace omnetpp;

class PDRModule : public cSimpleModule {

private:

int packetsSent;       // Total number of packets sent

int packetsReceived;   // Total number of packets received

protected:

virtual void initialize() override {

packetsSent = 0;

packetsReceived = 0;

// Schedule first packet send

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

}

virtual void handleMessage(cMessage *msg) override {

if (msg->isSelfMessage()) {

// Simulate sending a packet

packetsSent++;

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

send(packet, “out”);

// Schedule next packet send

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

delete msg;

} else {

// Packet received at the destination

packetsReceived++;

delete msg;

}

}

virtual void finish() override {

// Calculate and print Packet Delivery Ratio (PDR)

double pdr = 0;

if (packetsSent > 0) {

pdr = (static_cast<double>(packetsReceived) / packetsSent) * 100.0;

}

EV << “Packets Sent: ” << packetsSent << “\n”;

EV << “Packets Received: ” << packetsReceived << “\n”;

EV << “Packet Delivery Ratio (PDR): ” << pdr << ” %\n”;

}

};

Define_Module(PDRModule);

Explanation:

• initialize() Function:
  • Initializes the counters for packetsSent and packetsReceived and schedules the first packet to be sent.
• handleMessage() Function:
  • Manage both self-messages (used to send new packets) and incoming packets.
  • For each self-message, a packet is “sent,” and the packetsSent counter is incremented.
  • For each received packet, the packetsReceived counter is incremented.
• finish() Function:
  • At the end of the simulation, the function computes the PDR using the formula offered and logs the outcomes.

5. Run the Simulation:

• Compile and run OMNeT++ project. After the simulation completes, test the console output or logs to see the computed PDR.

6. Analyze and Interpret Results:

• The PDR gives the insight into the reliability of the network. A high PDR signifies that most packets are successfully delivered, while a low PDR recommends potential difficulties like network congestion, packet loss, or interference.

Additional Considerations:

• Network Conditions: Numerous factors like interference, congestion, and routing protocols can impact the PDR. Modify the network model to discover how these factors influence PDR.
• Packet Size and Traffic Type: The packet size and the type of traffic like = constant bit rate vs. variable bit rate can affect the PDR.

From the above steps are used to calculate and evaluate how much number of packets successfully received and transmitted over the network using the OMNeT++ tool. We plan to elaborate the detailed information regarding the packet delivery ratio.

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