To implement the energy harvesting for evolved Node B (eNB) using in OMNeT++ has comprises mimicking a base station that harvests energy from renewable sources and uses this energy to handle communication with User Equipment (UE) in a cellular network. This simulation can be helpful for learning the performance of green cellular networks, where base stations depend on renewable energy sources.
Steps to Implement Energy Harvesting for eNB in OMNeT++
- Install OMNeT++ and INET Framework:
- Make sure that OMNeT++ and the INET framework are installed. INET delivers numerous modules that can be extended to contain energy harvesting features.
- Define Network Topology and Node Models:
- Make a network topology that comprises an eNB that is evolved Node B and various UEs (User Equipment) in a .ned file.
- Expand the eNB model to contain an energy harvesting module.
- Model Energy Harvesting for eNB:
- Execute an energy harvesting module that mimics the energy collection from sources such as solar or wind. This module will keep the harvested energy in a battery or capacitor.
- Modify the eNB Module:
- Change the eNB module to account for the energy harvested. It can include testing energy levels previously transmitting data to UEs or powering down the eNB when energy is less.
- Simulation Configuration:
- Configure the simulation parameters in the .ini file, with the energy harvesting rate, battery capacity, energy consumption, and communication settings.
- Run the Simulation:
- Perform the simulation and evaluate the outcomes to measure how the energy harvesting affects the performance of the eNB in terms of communication with UEs.
Example: Basic Energy Harvesting for eNB Scenario
The following is an example setup to get we began with energy harvesting for eNB in OMNeT++.
- Network Definition in .ned file
network EnergyHarvestingENBNetwork
{
submodules:
eNB: ENB {
@display(“p=100,100”);
}
UE1: UserEquipment {
@display(“p=200,200”);
}
UE2: UserEquipment {
@display(“p=300,200”);
}
connections:
UE1.radioModule <–> eNB.radioModule;
UE2.radioModule <–> eNB.radioModule;
}
- Implement Energy Harvesting Module for eNB
Make a custom energy harvesting module for the eNB.
class ENBEnergyHarvester : public cSimpleModule
{
protected:
double energyStored;
double maxEnergyCapacity;
double harvestingRate;
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void harvestEnergy();
public:
double getEnergyStored() { return energyStored; }
};
Define_Module(ENBEnergyHarvester);
void ENBEnergyHarvester::initialize()
{
energyStored = par(“initialEnergy”);
maxEnergyCapacity = par(“maxEnergyCapacity”);
harvestingRate = par(“harvestingRate”);
scheduleAt(simTime() + 1, new cMessage(“harvestEnergy”));
}
void ENBEnergyHarvester::handleMessage(cMessage *msg)
{
if (strcmp(msg->getName(), “harvestEnergy”) == 0) {
harvestEnergy();
scheduleAt(simTime() + 1, msg);
}
}
void ENBEnergyHarvester::harvestEnergy()
{
energyStored += harvestingRate;
if (energyStored > maxEnergyCapacity) {
energyStored = maxEnergyCapacity;
}
}
- Modify eNB Module to Use Harvested Energy
Expand the eNB module to use the harvested energy for communication.
class EnergyAwareENB : public cSimpleModule
{
private:
ENBEnergyHarvester *energyHarvester;
double energyConsumptionPerTx;
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void handleCommunication();
public:
void setEnergyHarvester(ENBEnergyHarvester *harvester) { energyHarvester = harvester; }
};
Define_Module(EnergyAwareENB);
void EnergyAwareENB::initialize()
{
energyHarvester = check_and_cast<ENBEnergyHarvester*>(getSubmodule(“energyHarvester”));
energyConsumptionPerTx = par(“energyConsumptionPerTx”);
scheduleAt(simTime() + 0.1, new cMessage(“handleCommunication”));
}
void EnergyAwareENB::handleMessage(cMessage *msg)
{
if (strcmp(msg->getName(), “handleCommunication”) == 0) {
handleCommunication();
scheduleAt(simTime() + 0.1, msg);
}
}
void EnergyAwareENB::handleCommunication()
{
if (energyHarvester->getEnergyStored() >= energyConsumptionPerTx) {
// Perform communication with UEs
energyHarvester->energyStored -= energyConsumptionPerTx;
} else {
EV << “Not enough energy to communicate.\n”;
}
}
- Configure the Simulation in .ini file
[General]
network = EnergyHarvestingENBNetwork
sim-time-limit = 100s
**.energyHarvester.initialEnergy = 0.5 # Initial energy in Joules
**.energyHarvester.maxEnergyCapacity = 10.0 # Max energy capacity in Joules
**.energyHarvester.harvestingRate = 0.1 # Energy harvesting rate in Joules per second
**.EnergyAwareENB.energyConsumptionPerTx = 0.2 # Energy consumption per transmission in Joules
Running the Simulation
- Compile the modules and run the simulation using OMNeT++.
- Evaluate the results, aiming on the eNB’s ability to keep up communication with UEs given the energy harvested.
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