How to Implement Wireless LANs in OMNeT++

To implement the wireless LAN (WLANs) in OMNeT++ has needs to embrace designing and emulating a network that customs the wireless communication protocols, like IEEE 802.11, to connect devices and then OMNeT++ with the INET framework offers the complete support for mimic the WLANs. The given below are the procedures on implementing Wireless LANs in OMNeT++ using the INET framework:

Step-by-Step Implementation

1. Install OMNeT++ and INET Framework

Make sure that OMNeT++ and the INET Framework installed.

2. Create a New OMNeT++ Project

1. Open OMNeT++ IDE: Start the OMNeT++ IDE.
2. Create a New Project: Go to File -> New -> OMNeT++ Project. Name the project such as  WLANSimulation.

3. Define the Network Topology

Generate a novel NED file to describe the network topology that contains access points and wireless hosts.

Example: WLAN Network Topology (WLANNetwork.ned)

package wlan;

import inet.node.inet.AccessPoint;

import inet.node.inet.WirelessHost;

network WLANNetwork

{

parameters:

@display(“bgb=800,400”);

submodules:

accessPoint: AccessPoint {

@display(“p=400,200”);

}

host1: WirelessHost {

@display(“p=200,200”);

}

host2: WirelessHost {

@display(“p=600,200”);

}

connections allowunconnected:

}

4. Configure the Simulation

Create an OMNeT++ initialization file to configure the parameters of the simulation.

Example: Configuration File (omnetpp.ini)

network = wlan.WLANNetwork

sim-time-limit = 100s

# Visualization

*.visualizer.canvasVisualizer.displayBackground = true

*.visualizer.canvasVisualizer.displayGrid = true

# Access Point Configuration

*.accessPoint.wlan[0].typename = “Ieee80211Interface”

*.accessPoint.wlan[0].mac.typename = “Ieee80211MgmtAp”

*.accessPoint.wlan[0].mac.ssid = “MyNetwork”

*.accessPoint.wlan[0].radio.typename = “Ieee80211Radio”

*.accessPoint.wlan[0].radio.bandName = “2.4 GHz”

# Host Configuration

*.host*.wlan[0].typename = “Ieee80211Interface”

*.host*.wlan[0].mac.typename = “Ieee80211MgmtSta”

*.host*.wlan[0].mac.ssid = “MyNetwork”

*.host*.wlan[0].radio.typename = “Ieee80211Radio”

*.host*.wlan[0].radio.bandName = “2.4 GHz”

# IP Address Configuration

*.accessPoint.ipv4.config = xmldoc(“accessPoint.xml”)

*.host1.ipv4.config = xmldoc(“host1.xml”)

*.host2.ipv4.config = xmldoc(“host2.xml”)

# Application Configuration

*.host*.numApps = 1

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

*.host*.app[0].destAddresses = “accessPoint”

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

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

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

5. Create IP Address Configuration Files

Create XML files to define the IP address configuration for each node.

Example: IP Configuration File for accessPoint (accessPoint.xml)

<config>

<interface>

<name>wlan0</name>

<address>192.168.0.1</address>

<netmask>255.255.255.0</netmask>

</interface>

</config>

Example: IP Configuration File for host1 (host1.xml)

<config>

<interface>

<name>wlan0</name>

<address>192.168.0.2</address>

<netmask>255.255.255.0</netmask>

</interface>

</config>

Example: IP Configuration File for host2 (host2.xml)

<config>

<interface>

<name>wlan0</name>

<address>192.168.0.3</address>

<netmask>255.255.255.0</netmask>

</interface>

</config>

6. Implement Application Logic

To simulate the features of applications running on the hosts and we need to use pre-defined application modules in the INET framework or execute its own.

Example: UDP Basic Application (Pseudo-Code)

#include <omnetpp.h>

#include <inet/applications/udpapp/UdpBasicApp.h>

using namespace omnetpp;

using namespace inet;

class CustomUdpApp : public UdpBasicApp

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

};

Define_Module(CustomUdpApp);

void CustomUdpApp::initialize(int stage) {

UdpBasicApp::initialize(stage);

if (stage == INITSTAGE_APPLICATION_LAYER) {

// Custom initialization code

}

}

void CustomUdpApp::handleMessageWhenUp(cMessage *msg) {

UdpBasicApp::handleMessageWhenUp(msg);

// Custom message handling code

}

7. Run the Simulation

1. Build the Project: Right-click on your project and select Build Project.
2. Run the Simulation: Click on the green play button in the OMNeT++ IDE to start the simulation.

In the end, we provide the comprehensive procedure to complete the implementation process for wireless LAN that can used to communicate wirelessly that were implemented in OMNet++ using INET framework. Further details regarding the implementation of the wireless LAN in different simulations will be provided.

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