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How to Implement Wireless Mesh Topology in OMNeT++

To implement a wireless mesh topology in OMNeT++ using the INET framework has encompasses to make a network where nodes are interconnected wirelessly that permits the information to hop from node to node and the Wireless mesh networks are usually used in scenarios where nodes can interact directly with each other, without depend on a central organization such as a router or access point. Below is the approach to implement a wireless mesh topology in OMNeT++:

Step-by-Step Implementation:

  1. Set up OMNeT++ and INET Framework
  • Make sure that OMNeT++ and the INET framework are installed and configured properly. The INET framework offers the essential modules for emulating the wireless communication and mesh networking.
  1. Define the Wireless Mesh Topology in a NED File
  • Generate a .ned file to describe the network topology. In a wireless mesh topology, each node is equipped with a wireless interface, and nodes communicate with one another directly.

Example:

package wirelessMeshTopologyExample;

import inet.node.inet.StandardHost;

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;

import inet.mobility.static.StationaryMobility;

network WirelessMeshTopology

{

parameters:

int numNodes = default(5);  // Number of nodes in the mesh network

submodules:

configurator: Ipv4NetworkConfigurator {

parameters:

@display(“p=100,100”);

}

node[numNodes]: StandardHost {

parameters:               @display(“p=100+200*cos(pi/2+i*2*pi/numNodes),100+200*sin(pi/2+i*2*pi/numNodes)”);

mobility.typename = “StationaryMobility”;  // Nodes are stationary

wlan[0].typename = “AdhocHost”;  // Use an ad-hoc wireless interface

gates:

wlanIn[0] <–> wlanOut[0];

}

connections allowunconnected:

for i=0..numNodes-2 {

for j=i+1..numNodes-1 {

node[i].wlan[0].connectTo = node[j].wlan[0];

}

}

}

  • In this example:
    • StandardHost represents each node in the network.
    • The StationaryMobility module is used for nodes that do not move.
    • AdhocHost is used for the wireless interface, simulating an ad-hoc (peer-to-peer) network.
    • Nodes are interconnected to form a mesh network, with each node having a direct wireless connection to other nodes.
  1. Configure the Nodes in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the nodes like IP addresses, mobility, and the applications they will run.

Example:

network = wirelessMeshTopologyExample.WirelessMeshTopology

 

# Configure IP addresses

*.configurator.networkConfigurator = “GlobalNetworkConfigurator”

*.configurator.ipv4RoutingTable@module = “*.node[*].ipv4.routingTable”

*.configurator.ipv4AddressRange = “10.0.0.0/16”

*.configurator.ipv4AddressAssignment = “auto”

# Mobility setup: nodes are stationary in this example

*.node[*].mobility.typename = “StationaryMobility”

*.node[*].mobility.initialX = uniform(0, 800)

*.node[*].mobility.initialY = uniform(0, 800)

# Example application setup: node 0 sends data to node 3

*.node[0].numApps = 1

*.node[0].app[0].typename = “UdpBasicApp”

*.node[0].app[0].destAddresses = “10.0.0.4”  # IP address of node[3]

*.node[0].app[0].destPort = 5000

*.node[0].app[0].messageLength = 1024B

*.node[0].app[0].sendInterval = 1s

*.node[3].numApps = 1

*.node[3].app[0].typename = “UdpSink”

*.node[3].app[0].localPort = 5000

  • In this example:
    • node[0] is configured to send UDP packets to node[3].
    • node[3] is configured to receive and process the packets.
    • The Ipv4NetworkConfigurator is used to automatically assign IP addresses to nodes.
  1. Configure Wireless Communication
  • Wireless communication is a key feature of the mesh topology. Make sure that the wireless interfaces (wlan[0]) are correctly configured for ad-hoc communication.

Example wireless configuration:

*.node[*].wlan[0].typename = “IdealWirelessInterface”

*.node[*].wlan[0].mac.address = auto

*.node[*].wlan[0].radio.transmitter.communicationRange = 200m

  • This configuration uses IdealWirelessInterface for the wireless interface, with a communication range set to 200 meters.
  1. Run the Simulation
  • After setting up the network topology and configuration compile and run the simulation in OMNeT++. We need to see nodes interact directly with each other over the wireless mesh network.
  1. Analyze the Results
  • Use OMNeT++’s built-in tools to visualize and evaluate the network traffic. Investigate how data is transferred across the mesh network, how packets are routed among nodes, and how the network handles traffic.
  1. Enhancements and Variations
  • Mobility: Familiarize mobility models where nodes can move around, and monitor how the mesh network adapts to changes in node positions.
  • Routing Protocols: To execute and validate various routing protocols like AODV (Ad hoc On-Demand Distance Vector) to see how they perform in a mesh topology.
  • Network Load: To execute the numerous traffic loads and study how the mesh topology manages the congestion and potential bottlenecks.

Example Files

  1. WirelessMeshTopology.ned: Defines the wireless mesh topology.
  2. omnetpp.ini: Contains configuration settings for the simulation.

The wireless mesh topology is used to communicate the information directly to the end devices it does not need any access point that was implemented using the OMNeT++ tool. Also, we deliver the more data about wireless mesh topology.

Project concepts and themes related to Wireless Mesh Topology in OMNeT++ can be got from omnet-manual.com team of developers. The execution of these Wireless Mesh Topology projects in OMNeT++ is facilitated by us. We offer superior simulation outcomes and support for your initiatives.

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