How to Calculate Network Connection Loss in omnet++
To calculate the network connection loss in OMNeT++ has includes detecting and measuring the sample where a connection among the two nodes is lost or disturbed during the simulation and this parameter is significant in scenarios where network reliability is crucial like in mobile networks, IoT, or any real-time communication systems.
Steps to Calculate Network Connection Loss in OMNeT++
- Define Connection Loss:
- Connection Loss occurs when a previously introduced the connection among the two nodes like client and server, sender and receiver is disturbed or fails. This can be due to numerous reasons like node failure, link failure, or network congestion.
- The parameter is usually quantified by counting the number of connection losses or by evaluating the duration of each loss.
- Detecting Connection Loss:
- Execute logic to identify when a connection is lost. This can be completed by monitoring particular events like:
- Failure to receive expected acknowledgment packets.
- Timeout events signify that a packet or a series of packets were not acknowledged within a particular time frame.
- Explicit disconnection events in your simulation model.
- Execute logic to identify when a connection is lost. This can be completed by monitoring particular events like:
bool connectionActive = true; // Track the state of the connection
simtime_t connectionLostTime; // Time when the connection is lost
simtime_t totalConnectionLostDuration = 0; // Total duration of connection loss
int connectionLossCount = 0; // Track the number of connection losses
- Monitor for Connection Loss:
- Execute the logic to validate for connection loss events. This could be completed using timers that test for missing acknowledgments, or handling particular error events.
void onPacketTimeout() {
if (connectionActive) {
connectionActive = false; // Mark connection as lost
connectionLostTime = simTime(); // Record the time when the connection was lost
connectionLossCount++; // Increment the count of connection losses
EV << “Connection lost at: ” << connectionLostTime << endl;
}
}
- Detecting Connection Restoration:
- Similarly, discover when the connection is restored. When the connection is re-established, compute the duration of the loss and accumulate it.
void onConnectionRestored() {
if (!connectionActive) {
simtime_t connectionRestoredTime = simTime();
simtime_t lossDuration = connectionRestoredTime – connectionLostTime;
totalConnectionLostDuration += lossDuration;
connectionActive = true; // Mark connection as active
EV << “Connection restored at: ” << connectionRestoredTime << ” after ” << lossDuration << ” s” << endl;
}
}
- Calculate and Record Metrics:
- At the end of the simulation, estimate the parameters like the total number of connection losses, the total duration of connection loss, and the average connection loss duration.
simtime_t averageLossDuration = totalConnectionLostDuration / connectionLossCount;
recordScalar(“Total Connection Loss Count”, connectionLossCount);
recordScalar(“Total Connection Lost Duration (s)”, totalConnectionLostDuration.dbl());
recordScalar(“Average Connection Loss Duration (s)”, averageLossDuration.dbl());
Example Implementation in OMNeT++
The below is the sample to implement the calculation of network connection loss in an OMNeT++ module:
class ConnectionMonitor : public cSimpleModule {
private:
bool connectionActive;
simtime_t connectionLostTime;
simtime_t totalConnectionLostDuration;
int connectionLossCount;
protected:
virtual void initialize() override {
connectionActive = true; // Assume connection starts as active
totalConnectionLostDuration = 0;
connectionLossCount = 0;
}
virtual void handleMessage(cMessage *msg) override {
if (msg->isSelfMessage()) {
// Handle self-messages like timeouts
onPacketTimeout();
} else {
// Handle incoming packets
cPacket *pkt = check_and_cast<cPacket*>(msg);
// Example logic to detect connection restoration
if (!connectionActive) {
onConnectionRestored();
}
// Process the packet further if necessary
delete pkt; // Clean up the packet
}
}
void onPacketTimeout() {
if (connectionActive) {
connectionActive = false; // Mark connection as lost
connectionLostTime = simTime(); // Record the time when the connection was lost
connectionLossCount++;
EV << “Connection lost at: ” << connectionLostTime << endl;
}
}
void onConnectionRestored() {
if (!connectionActive) {
simtime_t connectionRestoredTime = simTime();
simtime_t lossDuration = connectionRestoredTime – connectionLostTime;
totalConnectionLostDuration += lossDuration;
connectionActive = true; // Mark connection as active
EV << “Connection restored at: ” << connectionRestoredTime << ” after ” << lossDuration << ” s” << endl;
}
}
virtual void finish() override {
if (connectionLossCount > 0) {
simtime_t averageLossDuration = totalConnectionLostDuration / connectionLossCount;
recordScalar(“Total Connection Loss Count”, connectionLossCount);
recordScalar(“Total Connection Lost Duration (s)”, totalConnectionLostDuration.dbl());
recordScalar(“Average Connection Loss Duration (s)”, averageLossDuration.dbl());
EV << “Total Connection Loss Count: ” << connectionLossCount << endl;
EV << “Total Connection Lost Duration: ” << totalConnectionLostDuration << ” s” << endl;
EV << “Average Connection Loss Duration: ” << averageLossDuration << ” s” << endl;
} else {
EV << “No connection loss detected during the simulation.” << endl;
}
}
};
Explanation:
- Connection State Tracking:
- The module tracks whether the connection is active or lost and records the time when a connection is lost.
- Detection of Loss and Restoration:
- When a connection loss is identified, the module marks the connection as inactive and records the time. When the connection is restored, it estimates the duration of the loss and adds it to the total.
- Metric Calculation:
- At the end of the simulation, the total number of connection losses, the total duration of connection loss, and the average duration are estimated and recorded.
We obviously learned and validate how to calculate and measure the network connection loss using the OMNeT++ tool and we also offer the more additional information concerning the network connection loss.
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