How to Calculate Network Time Delay in omnet++

To calculate the network time delay in OMNeT++ has needs to include from its source to its destination across the network to determining the time it takes for a packet to travel. Time delay is a critical performance metric in network simulations, as it directly influences the quality of service, especially in real-time applications like voice over IP (VoIP), video streaming, and online gaming. This metric is frequently mentioned to as end-to-end delay or latency.

Steps to Calculate Network Time Delay in OMNeT++

1. Define Time Delay:
   • Time Delay (Latency): The time taken by a packet to travel from the source node to the end node.
   • It is usually measured as the variance among the time the packet is sent and the time it is received.
2. Track Packet Send and Receive Times:
   • In the OMNeT++ simulation, we want to record the time when a packet is sent from the source and the time when the packet is got at the end.
3. Calculate the Delay for Each Packet:
   • The delay for a packet is simply the variance among the receive time and the send time.

simtime_t sendTime;

simtime_t receiveTime;

simtime_t delay;

1. Implement Delay Calculation in OMNeT++:

Given is example of how we might execute this in an OMNeT++ module:

class MyApplication : public cSimpleModule {

private:

simsignal_t delaySignal;

protected:

virtual void initialize() override {

delaySignal = registerSignal(“packetDelay”);

}

virtual void handleMessage(cMessage *msg) override {

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

// Record the time the packet was sent (usually stored in the packet)

simtime_t sendTime = pkt->getCreationTime();

// Record the time the packet is received

simtime_t receiveTime = simTime();

// Calculate the delay

simtime_t delay = receiveTime – sendTime;

// Record the delay for statistical analysis

emit(delaySignal, delay);

EV << “Packet delay: ” << delay << ” s” << endl;

// Further processing of the packet

delete pkt;  // Clean up the packet

}

};

1. Record and Analyse the Delays:
   • Use the emit function to record the delay for each packet. It permits OMNeT++ to gather statistics on the delays, which we can analyse later.
   • OMNeT++ will spontaneously manage the gathering of these statistics, which can be watched in the simulation results.
2. Analyse Delays Across Multiple Packets:
   • We can evaluate the gathered delays using OMNeT++’s built-in tools or external tools like Python, R, or MATLAB after running the simulation to know the distribution of delays, average delay, maximum delay, etc.

Example Scenario

Suppose we are mimicking a network where packets are sent from one node to another, and we need to compute the time delay for each packet:

class SimpleApp : public cSimpleModule {

private:

simsignal_t delaySignal;

protected:

virtual void initialize() override {

delaySignal = registerSignal(“packetDelay”);

}

virtual void handleMessage(cMessage *msg) override {

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

// Calculate delay

simtime_t sendTime = pkt->getCreationTime(); // or another relevant time field

simtime_t receiveTime = simTime();

simtime_t delay = receiveTime – sendTime;

// Record the delay

emit(delaySignal, delay);

EV << “Packet delay: ” << delay << ” s” << endl;

// Further packet handling logic (e.g., forward to another module)

delete pkt;

}

};

Steps to Access and Analyse the Results

1. Run the Simulation: After executing the above code, run the OMNeT++ simulation.
2. View Results: When the simulation completes, move to the “Result Analysis” section in OMNeT++.
3. Analyse Delay Statistics: We can analyse several statistics like the mean, median, minimum, maximum, and standard deviation of the packet delays.
4. Plot Delay Distribution: We can plot the distribution of delays to visually inspect how delays change across several packets.

In conclusion, we had exposed valuable informations and procedure to compute the Network Time Delay using in OMNeT++. We will present complete details as per your requirements.

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