How to Implement aodv protocol in OMNeT++

To implement the Ad hoc On-demand Distance Vector (AODV) protocol in OMNeT++ required a number of steps which is  setting up the environment, understanding the protocol, creating the AODV module, integrating it with the INET framework, and testing it. Below, we provide a step-by-step implementation:

Step-by-Step Implementation:

Step 1: Set Up OMNeT++ and INET Framework

1. Install OMNeT++: You have to install the latest version of OMNeT++.
2. Install INET Framework: Also, install the INET framework from the INET repository.

Step 2: Understand AODV Protocol

AODV is a reactive routing protocol used in mobile ad hoc networks (MANETs). It includes:

• Route Requests (RREQs): Broadcast to discover routes.
• Route Replies (RREPs): Sent in response to RREQs.
• Route Errors (RERRs): Point out link breakages.
• Hello Messages: Optional messages to detect link status to neighbors.

Step 3: Create AODV Module

1. Define AODV Module: Create new .ned, .h, and .cc files for the AODV module.
2. Handle AODV Packets: Execute handling for RREQ, RREP, RERR, and optionally Hello packets.
3. Route Discovery and Maintenance: Execute the route discovery and maintenance mechanisms.

Step 4: Integrate with INET Framework

1. Extend Routing Functionality: To include AODV, we have to expand the INET routing functionality.
2. Packet Format: In the INET framework, we have to state the packet format for AODV packets.
3. Simulation Model: Amend or create network simulation models to include AODV-enabled nodes.

Step 5: Simulation and Testing

1. Configure Network: Set up a test network configuration using .ned files to describe the network topology.
2. Simulation Parameters: Define parameters for simulation that has timings for RREQs, RREPs, and RERRs.
3. Run Simulations: Examine the behavior ADOV in various network conditions by executing simulations.
4. Analyze Results: Analyze results to check the correct implementation of the AODV protocol.

Step 6: Debug and Optimize

1. Debugging: Use OMNeT++’s debugging tools to troubleshoot issues.
2. Optimization: Enhance the AODV implementation for performance and accuracy.

Example Implementation Outline

AODV.ned

simple AODV

{

parameters:

double rreqTimeout @unit(s) = default(2s);

double helloInterval @unit(s) = default(1s);

gates:

input in[];

output out[];

}

AODV.h

#ifndef __AODV_H_

#define __AODV_H_

#include <omnetpp.h>

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

#include “inet/networklayer/ipv4/IPv4Datagram_m.h”

using namespace omnetpp;

using namespace inet;

class AODV : public cSimpleModule

{

private:

double rreqTimeout;

double helloInterval;

IRoutingTable *routingTable;

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

void handleRREQ(cMessage *msg);

void handleRREP(cMessage *msg);

void handleRERR(cMessage *msg);

void sendRREQ();

void sendHello();

public:

AODV();

virtual ~AODV();

};

#endif

AODV.cc

#include “AODV.h”

Define_Module(AODV);

AODV::AODV()

{

}

AODV::~AODV()

{

}

void AODV::initialize()

{

rreqTimeout = par(“rreqTimeout”);

helloInterval = par(“helloInterval”);

routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);

scheduleAt(simTime() + helloInterval, new cMessage(“sendHello”));

}

void AODV::handleMessage(cMessage *msg)

{

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

{

sendHello();

scheduleAt(simTime() + helloInterval, msg);

}

else if (strcmp(msg->getName(), “RREQ”) == 0)

{

handleRREQ(msg);

}

else if (strcmp(msg->getName(), “RREP”) == 0)

{

handleRREP(msg);

}

else if (strcmp(msg->getName(), “RERR”) == 0)

{

handleRERR(msg);

}

else

{

// Handle other message types

}

}

void AODV::handleRREQ(cMessage *msg)

{

// Implementation of handling a route request packet

}

void AODV::handleRREP(cMessage *msg)

{

// Implementation of handling a route reply packet

}

void AODV::handleRERR(cMessage *msg)

{

// Implementation of handling a route error packet

}

void AODV::sendRREQ()

{

// Implementation of sending a route request packet

}

void AODV::sendHello()

{

// Implementation of sending a hello packet

}

We can guarantee you this approach has everything that needs to know about the implementation of the AODV protocol which is executed in the OMNeT++ environment. According to your needs, we offer anything relevant to this protocol. If you want the best results for implementing and simulating ad hoc protocols in OMNeT++, feel free to reach out to our team. We can help you come up with great project ideas!