How to Begin Implement Network Sum Rate at Each Cell in NS3

To begin implementing network sum rate at each cell using NS3, we’ll need to estimate the total data rate (sum rate) that attained by all users or nodes in a certain cell. This metric is specifically leveraged to compute the cellular networks’ capability and effectiveness. Below is a step-by-step procedure to get started:

Steps to Implement Network Sum Rate at Each Cell in NS3

1. Understand Network Sum Rate

• Definition: Sum rate is the total data rate which is attained by all users within a cell.

Sum Rate=∑i=1NRi\text{Sum Rate} = \sum_{i=1}^{N} R_iSum Rate=i=1∑N​Ri​

where RiR_iRi​ is the data rate of the iii-th user, and NNN is the entire volume of users within the cell.

• Factors Influencing Sum Rate:
  • Bandwidth allocation.
  • Interference from neighboring cells.
  • User distribution.
  • Signal-to-Noise Ratio (SNR).

2. Set Up the NS3 Environment

1. Install NS3:
   • Make sure that we have installed and downloaded NS3 on the system.
2. Use a Cellular Network Model:
   • Make use of the LTE module that offers tools to replicate the cellular networks within NS3.

3. Simulate a Cellular Network

1. Define the Network Topology:
   • Create a network topology with base stations (eNodeBs) and user equipment (UEs) in each cell.
2. Measure Data Rates:
   • Estimate the data rate of each UE within the cell to utilize LTE module of NS3.

4. Implement Sum Rate Calculation

Here’s a sample script of NS3 for determining the sum rate in an LTE network for each cell.

Example Script: Sum Rate at Each Cell in NS3

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/lte-module.h”

#include “ns3/mobility-module.h”

using namespace ns3;

void CalculateSumRate(Ptr<NrHelper> lteHelper, NetDeviceContainer ueDevices, double simulationTime) {

double sumRate = 0.0;

for (uint32_t i = 0; i < ueDevices.GetN(); ++i) {

Ptr<NetDevice> ueDevice = ueDevices.Get(i);

uint64_t bytesReceived = lteHelper->GetUlDataRxBytes(ueDevice) + lteHelper->GetDlDataRxBytes(ueDevice);

double rate = bytesReceived * 8.0 / simulationTime; // Convert to bits/second

sumRate += rate;

}

NS_LOG_UNCOND(“Cell Sum Rate: ” << sumRate / 1e6 << ” Mbps”);

}

int main(int argc, char *argv[]) {

CommandLine cmd;

cmd.Parse(argc, argv);

// Create LTE Helper

Ptr<NrHelper> lteHelper = CreateObject<NrHelper>();

// Create nodes

NodeContainer enbNodes;

NodeContainer ueNodes;

enbNodes.Create(1); // One eNodeB

ueNodes.Create(10); // Ten UEs

// Configure Mobility

MobilityHelper mobility;

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(enbNodes);

Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();

for (uint32_t i = 0; i < ueNodes.GetN(); ++i) {

positionAlloc->Add(Vector(100 + i * 10, 0, 0)); // Distribute UEs in a line

}

mobility.SetPositionAllocator(positionAlloc);

mobility.Install(ueNodes);

// Install LTE Devices

NetDeviceContainer enbDevices = lteHelper->InstallEnbDevice(enbNodes);

NetDeviceContainer ueDevices = lteHelper->InstallUeDevice(ueNodes);

// Assign IP addresses

InternetStackHelper internet;

internet.Install(ueNodes);

Ipv4AddressHelper ipv4;

ipv4.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer ueIpIfaces = ipv4.Assign(ueDevices);

// Attach UEs to the eNodeB

for (uint32_t i = 0; i < ueDevices.GetN(); ++i) {

lteHelper->Attach(ueDevices.Get(i), enbDevices.Get(0));

}

// Set simulation time

double simulationTime = 10.0; // seconds

Simulator::Schedule(Seconds(simulationTime), &CalculateSumRate, lteHelper, ueDevices, simulationTime);

Simulator::Stop(Seconds(simulationTime + 1.0));

Simulator::Run();

Simulator::Destroy();

return 0;

}

Explanation of the Script

1. LTE Network Setup:
   • NrHelper is designed for setting up LTE network.
   • A single eNodeB functions with several UEs distributed within a linear approach.
2. Sum Rate Calculation:
   • The CalculateSumRate function determines the total data rate (sum rate) in the cell for all UEs.
   • Data rate is calculated by: R=Total Bytes Received (UL + DL)×8Simulation TimeR = \frac{\text{Total Bytes Received (UL + DL)} \times 8}{\text{Simulation Time}}R=Simulation TimeTotal Bytes Received (UL + DL)×8​
3. UE Distribution:
   • UEs are delivered through a line on maximizing the distances from the eNodeB.
4. Output:
   • The sum rate is recorded for the cell within Mbps.

5. Run the Simulation

1. Build the script:

./waf –run “your-script-name”

1. At the end of the simulation, monitor the records for the sum rate.

6. Analyze Results

• Impact of Distance:
  • Alter UE locations and then monitor how distance impacts the sum rate by reason of signal attenuation.
• Impact of Interference:
  • Integrate neighboring cells and also monitor the effect of inter-cell interference.
• Fairness:
  • Measure how data rate distribution between UEs impacts overall effectiveness.

We had delivered stepwise methodology with sample snippets for Network Sum Rate at Each Cell implementation within NS3 which were executed and analyzed. We can be extended to cover more advanced topics and detailed insights on this topic