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How to Calculate Network Transmission power in omnet++

To calculate network transmission power in OMNeT++ has need to determine the power level at which nodes like wireless transmitters that transfer the signals to other nodes and the term transmission power is a critical parameter in wireless networks that impacts the signal strength, coverage area, interference, and energy consumption

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The below is the brief structure to calculate the network transmission power in OMNeT++:

Steps to Calculate Network Transmission Power in OMNeT++:

  1. Set Up the Network Model:
    • Describe the wireless network topology using NED files in OMNeT++. This contains to setting up nodes such as wireless access points, base stations, or mobile devices.
  2. Configure the Transmission Power:
    • Use the proper module metrics to set the transmission power for each node. In OMNeT++ with the INET framework usually needs to set this in the transmitter module that relates with the wireless interface like Ieee80211Nic, Antenna, or other relevant modules.
  3. Measure or Access Transmission Power:
    • The transmission power can be directly retrieved from the module’s parameters or compute during the simulation if it is dynamically modified based on channel conditions or power control techniques.
  4. Log or Analyse Transmission Power:
    • During the simulation, we want to log or evaluate the transmission power to measure how it changes over time or in response to network conditions.

Example Implementation: Accessing and Logging Transmission Power

The below is an sample on how to access and log the transmission power in OMNeT++:

#include <omnetpp.h>

#include “inet/physicallayer/contract/packetlevel/IRadio.h”

#include “inet/physicallayer/contract/packetlevel/IRadioMedium.h”

using namespace omnetpp;

using namespace inet;

using namespace inet::physicallayer;

class TransmissionPowerModule : public cSimpleModule {

private:

IRadio *radio;                      // Pointer to the radio module

simsignal_t transmissionPowerSignal;  // Signal to record transmission power

protected:

virtual void initialize() override {

// Find the radio module within the network node

radio = check_and_cast<IRadio *>(getParentModule()->getSubmodule(“radio”));

transmissionPowerSignal = registerSignal(“transmissionPowerSignal”);

// Schedule the first transmission power check

scheduleAt(simTime() + par(“checkInterval”).doubleValue(), new cMessage(“checkPower”));

}

virtual void handleMessage(cMessage *msg) override {

if (strcmp(msg->getName(), “checkPower”) == 0) {

// Access the transmission power from the radio module

W transmissionPower = radio->getTransmissionPower();

double transmissionPowerDBm = transmissionPower.get() * 1e3; // Convert to dBm

// Emit the transmission power signal

emit(transmissionPowerSignal, transmissionPowerDBm);

EV << “Current Transmission Power: ” << transmissionPowerDBm << ” dBm\n”;

// Schedule the next transmission power check

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

} else {

delete msg;

}

}

};

Define_Module(TransmissionPowerModule);

Explanation:

  • TransmissionPowerModule:
    • radio: A pointer to the radio module (e.g., Ieee80211Radio) that manages the transmission and reception of signals.
    • transmissionPowerSignal: Registers a signal to release the current transmission power for logging or analysis.
  • initialize() Function:
    • Locates the radio module within the network node and schedules the first transmission power check.
  • handleMessage() Function:
    • checkPower: Retrieves the current transmission power from the radio module. The power is usually evaluated in watts (W), which can be converted to dBm for easier interpretation.
    • The power is then emitted as a signal and logged for analysis.
  1. Run the Simulation:
  • Compile and run OMNeT++ project. The simulation will occasionally check and log the transmission power of the node.
  1. Analyse and Interpret Results:
  • The transmission power values deliver the insights into how much power the node uses to transfer the signals. If the power is dynamically adjusted, the logs will reflect how the node adapts to changing network conditions.

Additional Considerations:

  • Dynamic Power Control: If network uses dynamic power control techniques, the transmission power will vary over time based on factors like link quality, interference, and distance to the receiver.
  • Impact on Network Performance: Transmission power directly impacts coverage, interference, and energy consumption. Lower power levels may save energy but reduce coverage, while higher power levels can increase interference.
  • Environment and Path Loss: Consider the impact of the environment that has obstacles, distance, and path loss when measuring the transmission power, as these factors will impact how much power is essential to maintain reliable communication.

As we discussed earlier about how to calculate the network transmission power using the OMNeT++ tool and also deliver additional information how the network transmission power will perform in other simulation tool.

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