How to Calculate Network Link success rate in omnet++
To calculate the network link success rate in OMNeT++ requires defining the ratio of magnificently transmitted packets through the total number of transmission tries on a given link. This metric is necessary for evaluating the reliability and performance of a wireless communication link.
Steps to Calculate Network Link Success Rate in OMNeT++:
- Set Up the Wireless Network Model:
- Use NED files to state the wireless network topology in OMNeT++. Contain nodes like access points, base stations, or mobile devices, and configure the wireless channel model.
- Implement Packet Transmission and Reception Logic:
- Manage the packet transmission and reception by using the built-in modules or custom modules. In the INET framework, simulating wireless communication by using modules like Ieee80211Mac or Ieee80211Radio.
- Track Transmission Attempts and Successes:
- We need to record both the total number of packet transmission attempts and the number of successfully received packets. Use counter in the simulation to achieve this.
- Calculate Link Success Rate:
- The link success rate can be estimated using the formula: Link Success Rate=Number of Successfully Received PacketsTotal Number of Transmission Attempts\text{Link Success Rate} = \frac{\text{Number of Successfully Received Packets}}{\text{Total Number of Transmission Attempts}}Link Success Rate=Total Number of Transmission AttemptsNumber of Successfully Received Packets
- Log or Analyze Link Success Rate:
- During the simulation, to analyse the reliability of the link by logging the link success rate. This rate can be calculated occasionally or at the end of the simulation.
Example Implementation: Link Success Rate Calculation
Following below we offered the sample to calculate it:
#include <omnetpp.h>
#include “inet/common/packet/Packet.h”
#include “inet/physicallayer/contract/packetlevel/IRadio.h”
#include “inet/linklayer/common/MacAddressTag_m.h”
using namespace omnetpp;
using namespace inet;
class LinkSuccessRateModule : public cSimpleModule {
private:
int numTransmissionAttempts; // Total number of transmission attempts
int numSuccessfulTransmissions; // Number of successfully received packets
simsignal_t successRateSignal; // Signal to record link success rate
protected:
virtual void initialize() override {
numTransmissionAttempts = 0;
numSuccessfulTransmissions = 0;
successRateSignal = registerSignal(“successRateSignal”);
// Subscribe to the signal that indicates packet reception (success)
getParentModule()->subscribe(IRadio::receptionEndedSignal, this);
}
virtual void receiveSignal(cComponent *source, simsignal_t signalID, cObject *obj, cObject *details) override {
if (signalID == IRadio::receptionEndedSignal) {
auto packet = check_and_cast<Packet *>(obj);
// Assume the packet reception is successful if it reaches this point
numSuccessfulTransmissions++;
}
}
virtual void handleMessage(cMessage *msg) override {
if (msg->isPacket()) {
Packet *packet = check_and_cast<Packet *>(msg);
// Increment the transmission attempt counter
numTransmissionAttempts++;
// Forward the packet to the next module
send(packet, “out”);
// Calculate and emit the link success rate
double successRate = (numTransmissionAttempts > 0) ? (double)numSuccessfulTransmissions / numTransmissionAttempts : 0.0;
emit(successRateSignal, successRate);
EV << “Link Success Rate: ” << successRate * 100 << ” %\n”;
} else {
delete msg;
}
}
virtual void finish() override {
// Calculate the final link success rate
double successRate = (numTransmissionAttempts > 0) ? (double)numSuccessfulTransmissions / numTransmissionAttempts : 0.0;
EV << “Final Link Success Rate: ” << successRate * 100 << ” %\n”;
}
};
Define_Module(LinkSuccessRateModule);
Explanation:
- LinkSuccessRateModule:
- numTransmissionAttempts: A counter that records the total number of transmission efforts on the link.
- numSuccessfulTransmissions: A counter that tracks the number of successfully received packets.
- successRateSignal: Registers a signal to emit the calculated link success rate for logging or analysis.
- initialize() Function:
- Initializes the counters and subscribes to the receptionEndedSignal, which is emitted by the radio when a packet is well received.
- receiveSignal() Function:
- This function is accelerated when a packet is successfully received, incrementing the numSuccessfulTransmissions counter.
- handleMessage() Function:
- Monitors incoming packets, increments the transmission attempt counter, and forwards the packet. It also estimates and radiates the link success rate.
- finish() Function:
- At the end of the simulation, calculates and logs the final link success rate.
- Run the Simulation:
- Compile and run the OMNeT++ project. The simulation will calculate and log the link success rate, offering insights into the reliability of the wireless link.
- Analyze and Interpret Results:
- The link success rate offers perceptions into the reliability of the communication link. A high success rate specifies that most transmission attempts are successful, while a low success rate suggests that the link is experiencing problems like interference, collisions, or weak signal strength.
Additional Considerations:
- Dynamic Conditions: The success rate can change over time because of the factors like mobility, interference, and varying network load. Make certain the simulation captures these dynamics.
- Packet Loss Reasons: Consider analyzing the reasons for packet loss like collisions, noise, or signal fading, to better know the factors impacting the success rate.
- Different Protocols: The success rate might differ based on the MAC and PHY layer protocols in use. We may need to compare success rates through various protocols to assess their performance.
In the above, we provided the comprehensive demonstration on how to calculate the link success rate in OMNeT++ using the INET framework with the example. For further references, we will provide details as per your requests.
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