How to Implement Heterogeneous Networks in OMNeT++

To implement the heterogeneous networks (HetNets) in OMNeT++ encompasses sets up a recreation atmosphere with numerous kinds of wireless networks liker WiFi, LTE, 5G, major network models, executing communication protocols, and consecutively simulations. This is the comprehensive step-by-step guide to support you device HetNets in OMNeT++ by the INET framework.

Step-by-Step Implementation:

Step 1: Install OMNeT++ and INET Framework

1. Download OMNeT++:
   • Move the OMNeT++   download the newest form.
2. Install OMNeT++:
   • For the operating system we track the installation instructions delivered on the website.
3. Download and Install INET Framework:
   • To the internet protocols and it is regularly to use among the OMNeT++ provided by The INET framework.
   • From the INET website to download it.

Step 2: Set Up Your Project

1. Create a New OMNeT++ Project:
   • Exposed the OMNeT++ IDE.
   • Try the File -> New -> OMNeT++ Project.
   • Arrive a project name and handpicked the suitable options.
2. Set Up Directory Structure:
   • To make sure the project has the needed folders, like src for source files and reproductions for NED files and formation.

Step 3: Define Network Models Using NED

1. Create NED Files:
   • In the src directory, make a new NED file such as HetNet.ned.
   • Express the network topology in the NED file. Given below the modest example:

package hetnet;

import inet.node.inet.StandardHost;

import inet.node.wireless.AccessPoint;

import inet.node.cellular.LteEnb;

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;

import inet.physicallayer.ieee80211.packetlevel.Ieee80211ScalarRadioMedium;

import inet.mobility.single.RandomWaypointMobility;

network HetNet

{

parameters:

int numWiFiHosts = default(10);

int numLTEHosts = default(5);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

wifiAp: AccessPoint {

@display(“p=300,200”);

}

lteEnb: LteEnb {

@display(“p=500,200”);

}

wifiHost[numWiFiHosts]: StandardHost {

@display(“p=200+100*i,400”);

mobility.typename = “RandomWaypointMobility”;

}

lteHost[numLTEHosts]: StandardHost {

@display(“p=200+100*i,600”);

mobility.typename = “RandomWaypointMobility”;

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numWiFiHosts-1 {

wifiHost[i].wlan[0] <–> radioMedium <–> wifiAp.wlan[0];

}

for i=0..numLTEHosts-1 {

lteHost[i].wlan[0] <–> radioMedium <–> lteEnb.wlan[0];

}

}

Step 4: Implement Communication Logic in C++

1. Create C++ Modules:
   • In the src directory, generate a new C++ class like HetNetHost.cc.
   • Include necessary OMNeT++ headers and outline your module:

#include <omnetpp.h>

#include “inet/applications/base/ApplicationBase.h”

#include “inet/applications/udpapp/UdpBasicApp.h”

#include “inet/networklayer/common/L3AddressResolver.h”

#include “inet/networklayer/contract/ipv4/Ipv4Address.h”

#include “inet/networklayer/contract/IL3AddressType.h”

using namespace omnetpp;

using namespace inet;

class HetNetHost : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void sendPacket();

void handlePacket(cPacket *pkt);

};

Define_Module(HetNetHost);

void HetNetHost::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_LOCAL) {

// Initialization code

if (par(“sendPackets”).boolValue()) {

scheduleAt(simTime() + par(“startDelay”), new cMessage(“sendPacket”));

}

}

}

void HetNetHost::handleMessageWhenUp(cMessage *msg)

{

if (msg->isSelfMessage()) {

if (strcmp(msg->getName(), “sendPacket”) == 0) {

sendPacket();

scheduleAt(simTime() + par(“sendInterval”), msg);

}

} else {

cPacket *pkt = check_and_cast<cPacket *>(msg);

handlePacket(pkt);

}

}

void HetNetHost::sendPacket()

{

// Create and send a packet

EV << “Sending packet” << endl;

cPacket *pkt = new cPacket(“HetNetPacket”);

pkt->setByteLength(par(“packetSize”));

send(pkt, “lowerLayerOut”);

}

void HetNetHost::handlePacket(cPacket *pkt)

{

// Handle received packet

EV << “Received packet: ” << pkt->getName() << endl;

delete pkt;

}

1. Modify NED to Use C++ Modules:
   • Update your NED file to use your custom heterogeneous network host module:

network HetNet

{

parameters:

int numWiFiHosts = default(10);

int numLTEHosts = default(5);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

wifiAp: AccessPoint {

@display(“p=300,200”);

}

lteEnb: LteEnb {

@display(“p=500,200”);

}

wifiHost[numWiFiHosts]: HetNetHost {

@display(“p=200+100*i,400”);

mobility.typename = “RandomWaypointMobility”;

}

lteHost[numLTEHosts]: HetNetHost {

@display(“p=200+100*i,600”);

mobility.typename = “RandomWaypointMobility”;

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numWiFiHosts-1 {

wifiHost[i].wlan[0] <–> radioMedium <–> wifiAp.wlan[0];

}

for i=0..numLTEHosts-1 {

lteHost[i].wlan[0] <–> radioMedium <–> lteEnb.wlan[0];

}

}

 

Step 5: Configure Simulation Parameters

1. Create omnetpp.ini:
   • In the simulations directory, create an omnetpp.ini file.
   • Define simulation parameters, such as the duration and network parameters:

[General]

network = HetNet

sim-time-limit = 100s

**.sendPackets = true

**.startDelay = 1s

**.sendInterval = 2s

**.packetSize = 1024B

**.wifiHost[*].mobility.typename = “inet.mobility.single.RandomWaypointMobility”

**.lteHost[*].mobility.typename = “inet.mobility.single.RandomWaypointMobility”

Step 6: Build and Run the Simulation

1. Build the Project:
   • In the OMNeT++ IDE, right-click on your project and select Build Project.
2. Run the Simulation:
   • Go to Run -> Run Configurations.
   • Set up a new run configuration for your project and run the simulation.

Step 7: Analyze Results

1. View Simulation Results:
   • After the simulation completes, use OMNeT++’s tools to evaluate the results.
   • Exposed the ANF (Analysis Framework) to visualize and interpret the data.

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