How to Calculate Network Intermediate Delay in omnet++

To calculate the network Intermediate delay in OMNeT++, intermediate delay is nothing but a delay experienced by a packet so that it traverses via intermediate nodes (like routers or switches) from the source to the destination, it contains processing delays, queuing delays, and transmission delays at each intermediate node. Follow the steps to calculate the network intermediate delay in OMNeT++:

Steps to Calculate Network Intermediate Delay in OMNeT++:

1. Set Up the Network Model:
   • In OMNeT++, state the network topology using NED files. This includes creating nodes and connecting them with suitable links.
   • Contain intermediate nodes (e.g., routers or switches) that will forward packets from the source to the destination.
2. Implement Traffic Generation:
   • Generate traffic that will traverse over the intermediate nodes by using or creating modules. This can be accomplished using applications like UdpApp, TcpApp, or custom traffic generators.
   • Make sure that packets are sent from the source node, pass over intermediate nodes, and finally reach the destination node.
3. Record Arrival and Departure Times at Intermediate Nodes:
   • At each intermediate node, trace the time when a packet arrives and the time when it departs after processing. This will permit you to compute the delay experienced at each node.
4. Calculate Intermediate Delay:
   • For each packet, the intermediate delay at a node can be calculated using the formula: Intermediate Delay=Departure Time−Arrival Time\text{Intermediate Delay} = \text{Departure Time} – \text{Arrival Time}Intermediate Delay=Departure Time−Arrival Time
   • Sum the delays at all intermediate nodes to acquire the total intermediate delay for every packet.

Example Implementation:

Here’s an example of how to calculate intermediate delay in OMNeT++:

#include <omnetpp.h>

using namespace omnetpp;

class IntermediateDelayModule : public cSimpleModule {

private:

simsignal_t intermediateDelaySignal;  // Signal for recording intermediate delay

simtime_t arrivalTime;                // Time when the packet arrived at this node

protected:

virtual void initialize() override {

// Register signal for intermediate delay

intermediateDelaySignal = registerSignal(“intermediateDelay”);

}

virtual void handleMessage(cMessage *msg) override {

if (msg->isSelfMessage()) {

// Simulate the processing and queuing delay at this node

arrivalTime = simTime();

scheduleAt(simTime() + par(“processingDelay”).doubleValue(), msg);

} else {

// Simulate the packet departure

simtime_t departureTime = simTime();

simtime_t delay = departureTime – arrivalTime;

// Emit the intermediate delay signal

emit(intermediateDelaySignal, delay);

// Forward the packet to the next node

send(msg, “out”);

}

}

};

Define_Module(IntermediateDelayModule);

Explanation:

• initialize() Function:
  • Record the intermediate delay at this node by registering a signal.
• handleMessage() Function:
  • Manages both self-messages (used to simulate processing delay) and incoming packets.
  • When a packet arrives at the node, the current time is noted as arrivalTime.
  • The node then processes the packet, and after the simulated processing delay, the packet is sent out. The time difference amongst when the packet arrived and when it was forwarded is the intermediate delay.
  • The delay is emitted as a signal, which can be logged and assessed.

5. Run the Simulation:

• Compile the OMNeT++ project and run the simulation. After the simulation completes, we can evaluate the intermediate delays at each node by analyzing the recorded signals.

6. Analyze and Interpret Results:

• Use the recorded intermediate delay signals to know how much delay packets experience at each intermediate node.
• This analysis can help classify potential bottlenecks or delays in the network that might impact overall performance.

Additional Considerations:

• Multiple Intermediate Nodes: We can extend the method to each node to measure the delay at every loop only if the network has multiple intermediate nodes.
• Traffic Patterns and Network Load: Changing traffic patterns and network load conditions can affect the intermediate delay. Experiment with various situations to see how the delay changes.

In Conclusion, we successfully concentrated on how to calculate the Intermediate Delay and when is this delay occurs in the network and what methods are need to compute this delay in OMNeT++. If you want any information about this calculation, we will offer it.

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