To calculate the network sum rate at each cell in OMNeT++ has determined the total data rate (or throughput) that a base station (or cell) can deliver to every connected users. The sum rate is a significant metric in cellular networks as it reflects the overall capacity and performance of the network. Below are the procedures on how to calculate the network sum rate at each cell in OMNeT++:

**Steps to Calculate Network Sum Rate at Each Cell in OMNeT++:**

**Set Up the Cellular Network Model:**- Describe the cellular network topology in OMNeT++ has contains to base stations (cells), user equipment (UEs), and the connections among them. Use NED files to model the network.

**Configure Transmission Parameters:**- Set up the essential transmission performance metrics like the data rate, bandwidth, and transmission power for each cell. These parameters will directly affect the sum rate.

**Generate Traffic for Each Cell:**- Use traffic generators such as UdpApp, TcpApp, or custom modules to emulate the data traffic among the base stations and the UEs. This traffic should signify the typical data load in a cellular network.

**Measure the Data Rate for Each User:**- Track the data rate for each UE connected to a base station and it includes evaluating the throughput each UE receives from its base station.

**Calculate the Sum Rate for Each Cell:**- The sum rate for a cell is the sum of the data rates of all UEs connected to that cell. This can be calculated using the formula: Sum Rate=∑i=1NData Rate of UEi\text{Sum Rate} = \sum_{i=1}^{N} \text{Data Rate of UE}_iSum Rate=i=1∑NData Rate of UEi
- Here, NNN is the number of UEs connected to the base station.

**Example Implementation: Sum Rate Calculation**

In the below are the sample of how to calculate the sum rate at each cell in OMNeT++:

#include <omnetpp.h>

#include “inet/common/packet/Packet.h”

using namespace omnetpp;

using namespace inet;

class CellSumRateModule : public cSimpleModule {

private:

std::map<int, double> ueDataRates; // Map to store data rates for each UE

simsignal_t sumRateSignal; // Signal to record the sum rate for the cell

protected:

virtual void initialize() override {

sumRateSignal = registerSignal(“sumRateSignal”);

// Schedule the first sum rate calculation

scheduleAt(simTime() + par(“sumRateInterval”).doubleValue(), new cMessage(“calculateSumRate”));

}

virtual void handleMessage(cMessage *msg) override {

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

// Calculate the sum rate for this cell

double sumRate = 0;

for (auto const& ueDataRate : ueDataRates) {

sumRate += ueDataRate.second;

}

// Emit the sum rate signal

emit(sumRateSignal, sumRate);

EV << “Sum Rate for this Cell: ” << sumRate / 1e6 << ” Mbps\n”;

// Schedule the next sum rate calculation

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

} else if (msg->isPacket()) {

// Process incoming data packets to update data rates

Packet *packet = check_and_cast<Packet *>(msg);

int ueId = packet->getTag<inet::UserIdTag>()->getId();

double packetSizeBits = packet->getByteLength() * 8;

double interval = par(“sumRateInterval”).doubleValue();

// Update the data rate for the UE

ueDataRates[ueId] = packetSizeBits / interval;

// Forward the packet or handle it as necessary

send(packet, “out”);

} else {

delete msg;

}

}

virtual void finish() override {

// Final sum rate calculation at the end of the simulation

double sumRate = 0;

for (auto const& ueDataRate : ueDataRates) {

sumRate += ueDataRate.second;

}

EV << “Final Sum Rate for this Cell: ” << sumRate / 1e6 << ” Mbps\n”;

}

};

Define_Module(CellSumRateModule);

**Explanation:**

**CellSumRateModule:****ueDataRates:**A map to store the data rate for each UE connected to the base station. The key is the UE ID, and the value is the data rate in bits per second.**sumRateSignal:**Registers a signal to release the intended sum rate for the cell.

**initialize() Function:**- Initializes the sum rate signal and schedules the first calculation of the sum rate.

**handleMessage() Function:****calculateSumRate:**Computes the sum rate for the cell by total the data rates of all connected UEs and reease this value.**Packet Handling:**When a data packet is received, it updates the data rate for the corresponding UE based on the packet size and the configured interval.

**finish() Function:**- At the end of the simulation, it computes the final sum rate for the cell and logs it.

**Run the Simulation:**

- Compile and run OMNeT++ project. The simulation will occasionally compute and log the sum rate for each cell.

**Analyse and Interpret Results:**

- The computed sum rate delivers a measure of the total capacity of each cell to manage traffic. Higher sum rates designate better performance and capacity utilization.

**Additional Considerations:**

**Interference and Signal Quality:**The data rates of UEs can be exaggerated by factors such as interference, signal quality, and distance from the base station. Consider these factors in simulation for more accurate outcomes.**Dynamic Traffic Loads:**If the traffic load is dynamic, make sure that simulation accounts for variations in data rates over time.**Resource Allocation:**The sum rate may also depend on how resources such as frequency bands or time slots are distributed among UEs. Reflect mimicking diverse resource allocation strategies to enhance the sum rate.

We had successfully calculate the network sum rate at each cell in OMNeT++ that has setup and configure the cellular network model and then measure the data rate and finally compute the sum rate in the traffic. We plan to provide further important information regarding the network sum rate in each cell.

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