How to Start Mesh Topology Projects using NS3

To create a Mesh Topology project in NS-3 and follow this step. Mesh topology is demonstrating through the nodes are connected in a decentralized manner in which every node can connect the different other nodes and ensuring their robust communication paths.

Steps to Start Mesh Topology Projects using NS3

Step 1: Set Up NS-3

  1. Install NS-3: Download NS-3. Follow the steps to install it along with the needed dependencies.
  2. Verify Installation: Run a test script:

./waf –run scratch/my_first

Step 2: Understand Mesh Topology

  • Mesh Topology:
    • Every node connects the different nodes.
    • Nodes can be rerouting traffic if a link fails are providing redundancy.
    • General in wireless networks nevertheless could be applied in wired scenarios.

Step 3: Plan Your Simulation

  • Decide on:
    • Number of Nodes: Describe on how many nodes will form the mesh.
    • Connections: Determine the connection model such as fully connected or partially connected mesh.
    • Traffic Patterns: State the traffic flows between nodes.
    • Protocols: Select the protocols like as OLSR or AODV for routing.

Step 4: Create the Mesh Topology

  1. Create Nodes: Utilized their NodeContainer we build the nodes.

NodeContainer nodes;

uint32_t numNodes = 9; // For a 3×3 mesh

nodes.Create(numNodes);

  1. Connect Nodes: Utilized their PointToPointHelper for wired mesh or WifiMeshHelper for wireless. For wired mesh:

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“100Mbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

for (uint32_t i = 0; i < numNodes; ++i) {

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

if (/* Condition for connecting nodes, e.g., adjacent in a grid */) {

p2p.Install(nodes.Get(i), nodes.Get(j));

}

}

}

For wireless mesh: Utilized their WifiMeshHelper:

MeshHelper mesh;

mesh.SetStandard(WIFI_PHY_STANDARD_80211a);

mesh.SetRemoteStationManager(“ns3::AarfWifiManager”);

mesh.SetStackInstaller(“ns3::Dot11sStack”, “Root”, Mac48AddressValue(Mac48Address::Allocate()));

mesh.Install(nodes);

  1. Install Internet Stack: Install the IP stack on the nodes.

InternetStackHelper stack;

stack.Install(nodes);

  1. Assign IP Addresses: Utilized their Ipv4AddressHelper we allocate the IPs.

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

Step 5: Set Up Applications

  1. Install Traffic Generators: Utilized their UdpEchoServer and UdpEchoClient to replicate the congestion.

Server:

UdpEchoServerHelper echoServer(9);

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

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

Clients: Install client applications on other nodes.

for (uint32_t i = 1; i < nodes.GetN(); ++i) {

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(i));

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

}

Step 6: Simulate and Analyze

  1. Run the Simulation:

Simulator::Run();

Simulator::Destroy();

  1. Capture Packets: Save traffic for analysis using .pcap files.

p2p.EnablePcap(“mesh_topology”, devices.Get(1), true);

  1. Trace Logs: Ensure the NS-3 logging for debugging:

export NS_LOG=”UdpEchoClientApplication=level_all|prefix_func”

./waf –run scratch/mesh_topology

Step 7: Enhance the Simulation

  • Establish the mobility for wireless nodes utilized MobilityHelper.
  • Replicate the failures and calculate the recovery.
  • Evaluate the parameter metrics such as delay, jitter, and throughput.

Example: Minimal NS-3 Script for Mesh Topology

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

#include “ns3/applications-module.h”

using namespace ns3;

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

uint32_t numNodes = 9;

NodeContainer nodes;

nodes.Create(numNodes);

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“100Mbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

NetDeviceContainer devices;

for (uint32_t i = 0; i < numNodes; ++i) {

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

if (/* Condition for connecting nodes */) {

NetDeviceContainer link = p2p.Install(nodes.Get(i), nodes.Get(j));

devices.Add(link);

}

}

}

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

UdpEchoServerHelper echoServer(9);

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

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

for (uint32_t i = 1; i < nodes.GetN(); ++i) {

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(i));

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

}

Simulator::Run();

Simulator::Destroy();

return 0;

}

Save the script as mesh_topology.cc, compile, and run:

./waf –run mesh_topology

Next Steps

  • Envision the topology utilized NetAnim.
  • Execute the routing protocols such as AODV or OLSR for dynamic pathfinding.
  • Validate the topology under different congestion loads and node/connection failures.

In this setup we had clearly gather information on how to setup the simulation and how to replicate the Mesh Topology using NS3 tool. We will offer insights into the implementation of the Mesh Topology in diverse simulation situations.

At phdprojects.org, we’re dedicated to helping you with Mesh Topology Projects using NS3. We offer tailored support whenever you require it. Feel free to reach out to us for research advice and a clear overview. Our developers give detailed, step-by-step guidance for your research, so you can count on us for fresh and relevant ideas.