How to Implement Delay Tolerant Networks in OMNeT++
To implement the Delay Tolerant Networks (DTNs) in OMNeT++ encompasses setting up the recreation situation, important network and node models, applying DTN-specific protocols and course-plotting strategies, and running the simulation. This is the comprehensive guide to benefit you grow started with DTN execution in OMNeT++.
Step-by-Step Implementation:
Step 1: Install OMNeT++ and INET Framework
- Download OMNeT++:
- Go to the OMNeT++ download the newest kind.
- Install OMNeT++:
- For the operating system we follow the connection instructions provided on the website.
- Download and Install INET Framework:
- For the internet protocols and is often by using OMNeT++ provided by the INET framework.
- You can download it from the INET website.
Step 2: Set Up Your Project
- Create a New OMNeT++ Project:
- Open the OMNeT++ IDE.
- Go to File -> New -> OMNeT++ Project.
- Enter a project name and select the appropriate options.
- Set Up Directory Structure:
- Ensure your project has the necessary folders, such as src for source files and simulations for NED files and configuration.
Step 3: Define Network Models Using NED
- Create NED Files:
- In the src directory, construct a new NED file like DTNNetwork.ned.
- Explain the network topology in the NED file. At this point this is the simple example:
package dtn;
import inet.node.inet.StandardHost;
import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;
import inet.mobility.single.RandomWaypointMobility;
import inet.physicallayer.ieee80211.packetlevel.Ieee80211ScalarRadioMedium;
network DTNNetwork
{
parameters:
int numNodes = default(10);
types:
channel radioChannel extends Ieee80211ScalarRadioMedium {}
submodules:
configurator: Ipv4NetworkConfigurator {
@display(“p=100,100”);
}
node[numNodes]: StandardHost {
@display(“p=200+100*i,200”);
@labels(“dtn-node”);
}
radioMedium: radioChannel {
@display(“p=400,100”);
}
connections allowunconnected:
for i=0..numNodes-1 {
for j=i+1..numNodes-1 {
node[i].wlan[0] <–> radioMedium <–> node[j].wlan[0];
}
}
}
Step 4: Implement DTN Logic in C++
- Create C++ Modules:
- In the src directory, create a new C++ class such as DTNHost.cc.
- Comprise required OMNeT++ headers and express the 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 DTNHost : public ApplicationBase
{
protected:
virtual void initialize(int stage) override;
virtual void handleMessageWhenUp(cMessage *msg) override;
void startTransmission();
void handleDataPacket(cPacket *pkt);
void forwardPacket(cPacket *pkt);
};
Define_Module(DTNHost);
void DTNHost::initialize(int stage)
{
ApplicationBase::initialize(stage);
if (stage == INITSTAGE_LOCAL) {
// Initialization code
if (par(“startTransmission”).boolValue()) {
scheduleAt(simTime() + par(“startDelay”), new cMessage(“startTransmission”));
}
}
}
void DTNHost::handleMessageWhenUp(cMessage *msg)
{
if (msg->isSelfMessage()) {
if (strcmp(msg->getName(), “startTransmission”) == 0) {
startTransmission();
}
delete msg;
} else {
cPacket *pkt = check_and_cast<cPacket *>(msg);
handleDataPacket(pkt);
}
}
void DTNHost::startTransmission()
{
// Create and send a packet
EV << “Starting data transmission” << endl;
cPacket *pkt = new cPacket(“DTNDataPacket”);
pkt->setByteLength(par(“packetSize”));
forwardPacket(pkt);
}
void DTNHost::handleDataPacket(cPacket *pkt)
{
// Handle received data packet
EV << “Received data packet: ” << pkt->getName() << endl;
forwardPacket(pkt);
}
void DTNHost::forwardPacket(cPacket *pkt)
{
// Forward packet logic (e.g., store-carry-forward)
EV << “Forwarding packet: ” << pkt->getName() << endl;
// Simple logic to send to a random neighbor
int numNeighbors = gateSize(“wlan”);
int neighbor = intuniform(0, numNeighbors – 1);
send(pkt, “wlan$o”, neighbor);
}
- Modify NED to Use C++ Modules:
- Inform the NED file to use your norm DTN host module:
network DTNNetwork
{
parameters:
int numNodes = default(10);
types:
channel radioChannel extends Ieee80211ScalarRadioMedium {}
submodules:
configurator: Ipv4NetworkConfigurator {
@display(“p=100,100”);
}
node[numNodes]: DTNHost {
@display(“p=200+100*i,200”);
@labels(“dtn-node”);
}
radioMedium: radioChannel {
@display(“p=400,100”);
}
connections allowunconnected:
for i=0..numNodes-1 {
for j=i+1..numNodes-1 {
node[i].wlan[0] <–> radioMedium <–> node[j].wlan[0];
}
}
}
Step 5: Configure Simulation Parameters
- Create omnetpp.ini:
- In the simulations directory, produce an omnetpp.ini file.
- State simulation parameters, like duration and network parameters:
[General]
network = DTNNetwork
sim-time-limit = 100s
**.startTransmission = true
**.startDelay = 10s
**.packetSize = 1024B
**.node[*].mobility.typename = “inet.mobility.single.RandomWaypointMobility”
**.node[*].mobility.initialZ = 1m
Step 6: Build and Run the Simulation
- Build the Project:
- In the OMNeT++ IDE, right-click on the project and choice Build Project.
- Run the Simulation:
- Go to Run -> Run Configurations.
- Set up a fresh run configuration for the project and run the simulation.
Step 7: Analyze Results
- View Simulation Results:
- After the simulation completes, by using OMNeT++’s tools to evaluate the consequences.
- Open the ANF (Analysis Framework) to envision and deduce the data.
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