How to Calculate Maximum Deadline in omnet++

To calculate the maximum deadline in OMNeT++ has usually defined to determine the extreme permissible time by which a particular event, like the delivery of a packet, must happen. This is commonly used in real-time systems, where meeting deadlines is crucial to system performance and the “maximum deadline” would be the drawn out of these deadlines to simulation deliberates. Below are the procedures to calculate the maximum deadline in OMNeT++:

Steps to Calculate Maximum Deadline in OMNeT++

1. Define the Deadline:
   • A deadline is the maximum time permits for a task like packet delivery that accomplished after it starts.
   • In OMNeT++, deadlines can be set as a timestamp that comparative to the packet creation time or as a fixed time interval after an event starts.
2. Track Deadlines:
   • In OMNeT++ simulation, we should observe the deadlines for the events of interest and we can store these deadlines in packets or events.

simtime_t deadline;  // This will hold the deadline for a packet

1. Assign Deadlines to Packets or Events:
   • When a packet is generated or an event is started, allocate a deadline. This can be a fixed time after the packet is created or could be enthusiastically intended based on network conditions.

simtime_t currentTime = simTime();

simtime_t deadline = currentTime + par(“deadlineInterval”);  // Example of a deadline after a fixed interval

1. Monitor and Compare Deadlines:
   • As packets or events progress via the network, monitor their deadlines. The maximum deadline is the largest of all these deadlines.

simtime_t maxDeadline = 0;  // Initialize to zero or a very small value

void checkDeadline(cPacket *pkt) {

simtime_t packetDeadline = pkt->getDeadline();  // Assuming your packet class has a getDeadline() method

if (packetDeadline > maxDeadline) {

maxDeadline = packetDeadline;  // Update max deadline if this packet’s deadline is greater

}

}

1. Calculate and Record the Maximum Deadline:
   • After processing all pertinent packets or events, record the maximum deadline observed.

recordScalar(“Maximum Deadline (s)”, maxDeadline.dbl());

EV << “Maximum Deadline: ” << maxDeadline << ” s” << endl;

Example Implementation in OMNeT++

The below are the sample of how we want to implement this in an OMNeT++ module:

class MyNetworkNode : public cSimpleModule {

private:

simtime_t maxDeadline;

protected:

virtual void initialize() override {

maxDeadline = 0;  // Initialize maximum deadline

}

virtual void handleMessage(cMessage *msg) override {

cPacket *pkt = check_and_cast<cPacket*>(msg);

// Assign a deadline to the packet if it doesn’t have one

if (!pkt->hasPar(“deadline”)) {

simtime_t deadlineInterval = par(“deadlineInterval”);  // Get deadline interval from parameters

simtime_t deadline = simTime() + deadlineInterval;

pkt->addPar(“deadline”) = deadline;

}

// Check and update the maximum deadline

checkDeadline(pkt);

// Continue processing the packet (forward, process, etc.)

send(pkt, “out”);

}

void checkDeadline(cPacket *pkt) {

simtime_t packetDeadline = pkt->par(“deadline”);

if (packetDeadline > maxDeadline) {

maxDeadline = packetDeadline;  // Update max deadline if this packet’s deadline is greater

}

}

virtual void finish() override {

// Record the maximum deadline at the end of the simulation

recordScalar(“Maximum Deadline (s)”, maxDeadline.dbl());

EV << “Maximum Deadline: ” << maxDeadline << ” s” << endl;

}

};

Explanation:

1. Packet Deadline Assignment:
   • Each packet is allotted a deadline based on the current simulation time and an interval parameter and this interval could denote the maximum time permits for packet delivery or processing.
2. Tracking the Maximum Deadline:
   • As each packet is processed, the module validates its deadline and modernizes the maxDeadline variable if the packet’s deadline surpasses the current maximum.
3. Recording the Maximum Deadline:
   • At the end of the simulation, the maximum deadline is recorded that permits to evaluate how close the system was to missing any deadlines.

In this page, we had successfully implemented and measure the maximum deadline using the OMNeT++ tool and also we deliver the additional insights regarding the maximum deadline.

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