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How To Implement Lifi In Ns3

To implement a Light Fidelity (LiFi) network in ns-3, we have to create a custom model or we can use an existing custom model if available. LiFi is a wireless communication technology. This technology uses light for transmitting data. Here is the complete guide on setting up a basic LiFi simulation in ns-3. This example needs a basic understanding of ns-3 and this example illustrates a simple setup using a hypothetical LiFi module. If you do not have LiFi module, then we have to develop one by extending existing ns-3 modules. We work on all types of LiFi module for your projects.

Steps to implement LiFi in ns-3

  1. Set up your development environment
  • Install ns-3 : Ensure that you have ns-3 installed in your computer. To install, follow the official ns-3 installation guide.
  • LiFi module : Make sure that you have LiFi module available in your system. If not, you have to develop a custom LiFi model.
  1. Create a basic Wi-Fi simulation script

Here is a basic LiFi scenario setup example script using ns-3 features. This script ensures that you have a LiFi module or you have a Wi-Fi as a placeholder for the concept demonstration.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/wifi-module.h” // Placeholder for LiFi module

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“LiFiNetwork”);

 

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

{

  // Set simulation parameters

  uint32_t numNodes = 5;

  double simTime = 20.0; // Simulation time in seconds

  CommandLine cmd;

  cmd.AddValue(“numNodes”, “Number of nodes”, numNodes);

  cmd.AddValue(“simTime”, “Simulation time”, simTime);

  cmd.Parse(argc, argv);

  // Create nodes

  NodeContainer nodes;

  nodes.Create(numNodes);

  // Set up mobility

  MobilityHelper mobility;

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

  mobility.Install(nodes);

  // Configure WiFi as placeholder for LiFi communication

  WifiHelper wifi;

  wifi.SetStandard(WIFI_PHY_STANDARD_80211n_5GHZ);

  YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default();

  YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default();

  wifiPhy.SetChannel(wifiChannel.Create());

  WifiMacHelper wifiMac;

  wifiMac.SetType(“ns3::AdhocWifiMac”);

 

  NetDeviceContainer devices = wifi.Install(wifiPhy, wifiMac, nodes);

  // Install the Internet stack on nodes

  InternetStackHelper internet;

  internet.Install(nodes);

  // Assign IP addresses to devices

  Ipv4AddressHelper ipv4;

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

  Ipv4InterfaceContainer interfaces = ipv4.Assign(devices);

  // Install applications (e.g., UDP echo)

  uint16_t port = 9;

  UdpEchoServerHelper echoServer(port);

  ApplicationContainer serverApps = echoServer.Install(nodes.Get(0));

  serverApps.Start(Seconds(1.0));

  serverApps.Stop(Seconds(simTime));

  UdpEchoClientHelper echoClient(interfaces.GetAddress(0), port);

  echoClient.SetAttribute(“MaxPackets”, UintegerValue(320));

  echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

  echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

  ApplicationContainer clientApps;

  for (uint32_t i = 1; i < numNodes; ++i) {

    clientApps.Add(echoClient.Install(nodes.Get(i)));

  }

  clientApps.Start(Seconds(2.0));

  clientApps.Stop(Seconds(simTime));

  // Enable tracing

  wifiPhy.EnablePcap(“lifi-network”, devices);

  // Run the simulation

  Simulator::Stop(Seconds(simTime));

  Simulator::Run();

  Simulator::Destroy();

  return 0;

}

Explanation of the script

In this set up, we had created a custom model and set up a basic LiFi simulation using ns-3 features. Let’s have a detailed explanation on the script below:

  1. Include necessary headers : Include all the required headers for ns-3 core, network, internet, application, mobility and Wi-Fi modules (used as a placeholder).
  2. Set simulation Parameters : Define the number of nodes and also define the simulation time.
  3. Create nodes : Using NodeContainer, create container for the nodes.
  4. Set up Wi-Fi (placeholder for LiFi) : Using YansWifiChannelHelper and YansWifiPhyHelper Configure the Wi-Fi channel and physical layer and WifiMacHelper for ad-hoc communication. You should replace with a actual LiFi module if available.
  5. Set Up Mobility : Using MobilityHelper, define the positions and mobility models.
  6. Install internet stack : Using InternetStackHelper, install the internet stack on all the nodes.
  7. Assign IP addresses : Using Ipv4AddressHelper, assign IP addresses to the devices.
  8. Install applications : On the first node, install the UDP echo server and on the remaining nodes, install the UDP echo clients to simulate communications.
  9. Enable tracking : Capture packet traces using pcap tracing for analysis.
  10. Run the simulator : Define the simulation stopping time and run the simulator and cleanup using Simulator::Stop, Simulator::Run, and Simulator::Destroy.

Further enhancements

                                 In future, we would enhance the LiFi module by providing advanced mobility, implementing QoS, analyzing network performance etc.

  1. Develop a Custom LiFi Module:
    • If you do not have a LiFi module then develop a new custom LiFi model by extending existing ns-3 modules.
  2. Advanced Mobility Models:
    • Create more realistic mobility models for LiFi nodes, that includes models which is based on real-world movement patterns.
  3. Data Rate and Range:
    • According to the LiFi specifications, configure the data rate and range.
  4. Quality of Service (QoS):
    • To prioritize critical data and ensure timely delivery, implement QoS mechanisms.
  5. Network Performance Metrics:
    • Collect and analyze performance metrics such as throughput, latency, packet delivery ratio, and energy consumption.
  6. Interference Modeling:
    • Model interference and evaluate it create great impact on network performance.
  7. Fault Tolerance and Resilience:
    • Implement and evaluate fault tolerance mechanisms and resilience strategies for LiFi communication.

Overall, we have learned on implementing a Light Fidelity (LiFi) network in ns-3 by creating a custom model and by setting up a basic LiFi simulation which uses hypothetical LiFi module. Also, we provide enormous information on Light Fidelity (LiFi) network.