How to Calculate Network Lifetime in omnet++

To calculate the network lifetime in OMNeT++, we need it for specific situations like wireless sensor networks (WSNs), in which the nodes usually operate on limited power battery. Network lifetime usually means duration until a significant portion of the network (or a critical node) depletes its energy, rendering the network non-functional for its anticipated reason. For best implementation guidance feel free to contact omnet-manual.com we will provide you with best outcome.

Follow the steps provided below to calculate the network lifetime:

Steps to Calculate Network Lifetime in OMNeT++:

1. Set Up the Network Model:
   • Use NED files to state the network topology as well as build the sensor nodes, base stations, and the communication links amongst them in OMNeT++.
2. Implement Energy Consumption Model:
   • In the network, we need to simulate the energy consumption of every node. OMNeT++ offers modules like INET framework that has energy modules like SimpleEnergyStorage or IdealEnergyStorage to simulate battery usage.
   • Each node’s energy consumption will hinge on its activities like transmitting, receiving, processing, and idle states.
3. Track Energy Levels:
   • Track the remaining energy of each node over time. The node’s energy will decrease according to its activity (e.g., transmitting packets consumes more energy than idling).
   • The network lifetime can be described in multiple ways:
     • Time until the first node dies (runs out of energy)
     • Time until a precise percentage of nodes die
     • Time until the network becomes divided or non-functional
4. Calculate Network Lifetime:
   • Observe the energy levels of the nodes and record the time when the stated network lifetime criterion is met.

Example Implementation:

Below is an example of how to calculate network lifetime in OMNeT++ using a simple energy consumption model:

#include <omnetpp.h>

#include “inet/power/storage/SimpleEpEnergyStorage.h”

using namespace omnetpp;

using namespace inet;

class SensorNode : public cSimpleModule {

private:

SimpleEpEnergyStorage *energyStorage;  // Energy storage module

cMessage *activityMsg;                 // Message to simulate node activity

protected:

virtual void initialize() override {

energyStorage = check_and_cast<SimpleEpEnergyStorage *>(getParentModule()->getSubmodule(“energyStorage”));

activityMsg = new cMessage(“activity”);

// Schedule the first activity event

scheduleAt(simTime() + par(“activityInterval”).doubleValue(), activityMsg);

}

virtual void handleMessage(cMessage *msg) override {

if (msg == activityMsg) {

// Simulate energy consumption due to activity (e.g., transmitting, receiving)

double energyConsumption = par(“energyConsumptionPerActivity”).doubleValue();

energyStorage->draw(energyConsumption);

// Check if the node has run out of energy

if (energyStorage->getResidualEnergyCapacity() <= 0) {

EV << “Node ” << getId() << ” has died due to energy depletion.\n”;

cancelAndDelete(activityMsg);  // Stop further activity

} else {

// Schedule the next activity event

scheduleAt(simTime() + par(“activityInterval”).doubleValue(), activityMsg);

}

}

}

virtual void finish() override {

EV << “Final residual energy of node ” << getId() << “: ” << energyStorage->getResidualEnergyCapacity() << ” J\n”;

}

};

Define_Module(SensorNode);

Explanation:

• SensorNode Module:
  • Energy Storage: Model the energy storage in every sensor nodes by using SimpleEpEnergyStorage. It permits us to simulate the energy consumption.
  • Activity Simulation: Each sensor node performs periodic activities that consume energy as well as transmitting or receiving data.
  • Energy Depletion Check: After each activity, the node checks its remaining energy. If the energy is depleted, the node stops further activities, simulating the node’s death.
• Network Lifetime Calculation:
  • The network lifetime can be monitored by verifying when the first node runs out of energy or when a significant portion of nodes have depleted their energy.

5. Run the Simulation:

• Compile and run the OMNeT++ project. The simulation will track the energy levels of each node and determine when the network is no longer functional.

6. Analyze and Interpret Results:

• Use the simulation results to define the network’s lifetime as per the predefined criteria. Analyze the energy consumption patterns and consider enhancing the network configuration to expand the lifetime.

Additional Considerations:

• Energy Models: If needed, we can use more sophisticated energy models. The INET framework offers different energy models that can replicate more difficult energy consumption patterns.
• Network Lifetime Definitions: Depends on the needs of the customer, we can customize the description of network lifetime like time until network partition, time until a critical node dies, or time until a certain percentage of nodes die.
• Optimization: Explore strategies like duty cycling, energy-efficient routing, or data accumulation to extend the network’s lifetime.

With the help of this approach, we successfully offered the complete information on how to calculate the network lifetime in OMNeT++ with an example which helps you to understand it. If needed, we will offer any other details of network lifetime and how to work it using another simulation method.