How to Start Irregular Topology Projects using NS3

Starting an Irregular Topology Project in NS-3

To simulate an Irregular Topology is a network layout deprived of a fixed the design or architecture. It is frequently utilized to replicate the real-world network environment like as urban wireless networks, sensor deployments, or ad hoc networks.

Steps to Start Irregular Topology Projects using NS3

Step 1: Set Up NS-3

  1. Install NS-3:
    • Download NS-3.
    • Build NS-3:

./waf configure

./waf build

  1. Verify Installation: Validate the NS-3 using a basic example:

./waf –run scratch/my_first

Step 2: Understand Irregular Topology

  • Characteristics:
    • The nodes are deployed in random positions.
    • Connections are depending the proximity, connection features, or predefined logic.
    • Beneficial for realistic replications with wireless or mobile networks.

Step 3: Plan the Topology

  1. Define the number of nodes:
    • For instance: 50 nodes.
  2. Decide the deployment area:
    • For sample: A 500×500-meter area.
  3. Choose communication patterns:
    • Peer-to-peer, many-to-one, or broadcast.
  4. Set simulation goals:
    • Estimate the coverage, packet delivery, and network performance.

Step 4: Set Up the Irregular Topology

  1. Create Nodes: Describe the nodes in the network.

NodeContainer nodes;

uint32_t numNodes = 50;

nodes.Create(numNodes);

  1. Set Up Wireless Devices: Utilized the Wi-Fi, LTE, or any other communication technology.

WifiHelper wifi;

wifi.SetStandard(WIFI_PHY_STANDARD_80211b);

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.Set(“RxGain”, DoubleValue(-10));

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

phy.SetChannel(channel.Create());

WifiMacHelper mac;

mac.SetType(“ns3::AdhocWifiMac”);

NetDeviceContainer devices = wifi.Install(phy, mac, nodes);

  1. Configure Node Placement: Deploy nodes randomly in the region.

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::RandomRectanglePositionAllocator”,

“X”, StringValue(“ns3::UniformRandomVariable[Min=0.0|Max=500.0]”),

“Y”, StringValue(“ns3::UniformRandomVariable[Min=0.0|Max=500.0]”));

 

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

mobility.Install(nodes);

  1. Install Internet Stack: Improve the Internet stack to overall nodes.

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

Step 5: Simulate Traffic

  1. Set Up Applications: Replicate the transmission among nodes.
    • UDP Echo Example:

UdpEchoServerHelper echoServer(9); // Port 9

ApplicationContainer serverApp = echoServer.Install(nodes.Get(0)); // Server on Node 0

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(interfaces.GetAddress(0), 9); // Server’s IP

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

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

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

ApplicationContainer clientApp = echoClient.Install(nodes.Get(10)); // Client on Node 10

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

  1. Use Flow Monitor: Calculate the throughput, delay, and packet loss.

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll();

monitor->SerializeToXmlFile(“irregular_topology_flowmon.xml”, true, true);

Step 6: Run and Analyze

  1. Run the Simulation:

Simulator::Run();

Simulator::Destroy();

  1. Enable Packet Capture: Save .pcap files for traffic analysis.

phy.EnablePcapAll(“irregular_topology”);

  1. Analyze Results: Utilized their Flow Monitor and packet traces we estimate the network performance.

Example: Minimal NS-3 Script for Irregular Topology

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/wifi-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

#include “ns3/flow-monitor-module.h”

using namespace ns3;

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

uint32_t numNodes = 50;

// Create nodes

NodeContainer nodes;

nodes.Create(numNodes);

 

// Configure Wi-Fi

WifiHelper wifi;

wifi.SetStandard(WIFI_PHY_STANDARD_80211b);

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.Set(“RxGain”, DoubleValue(-10));

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

phy.SetChannel(channel.Create());

WifiMacHelper mac;

mac.SetType(“ns3::AdhocWifiMac”);

NetDeviceContainer devices = wifi.Install(phy, mac, nodes);

// Configure mobility

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::RandomRectanglePositionAllocator”,

“X”, StringValue(“ns3::UniformRandomVariable[Min=0.0|Max=500.0]”),

“Y”, StringValue(“ns3::UniformRandomVariable[Min=0.0|Max=500.0]”));

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

mobility.Install(nodes);

// Install Internet stack

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

 

// Set up UDP echo server

UdpEchoServerHelper echoServer(9);

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

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

// Set up UDP echo client

UdpEchoClientHelper echoClient(interfaces.GetAddress(0), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

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

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

ApplicationContainer clientApp = echoClient.Install(nodes.Get(10));

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

// Enable Flow Monitor

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll();

monitor->SerializeToXmlFile(“irregular_topology_flowmon.xml”, true, true);

// Enable packet capture

phy.EnablePcapAll(“irregular_topology”);

// Run simulation

Simulator::Run();

Simulator::Destroy();

 

return 0;

}

Step 7: Enhance the Simulation

  • Dynamic Mobility:
    • Utilized the patterns such as RandomWalk2D to simulate node movement.
  • Advanced Routing:
    • Validate the various protocols like as AODV, OLSR, or DSDV.
  • Simulate Failures:
    • Unable the connections or nodes we follow the network resilience.
  • Visualize:
    • Utilized their NetAnim we show the topology and congestion flow.

You can clearly understand this approach and be able to implement the Irregular Topology by referring the given structured procedure and the examples using NS3 tool. We can also expand the simulation according to the requirements.

Our skill encompasses advising on urban wireless networks, sensor installations, and ad hoc networks customized to align with your particular research needs. For research assistance and a succinct overview, please reach out to phdprojects.org. We offer thorough, step-by-step guidance for your research endeavors, ensuring you can rely on us for innovative and pertinent topics. At phdprojects.org, we are dedicated to helping you commence Irregular Topology Projects utilizing NS3, providing tailored support whenever required.