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
- Install OMNeT++: You have to install the latest version of OMNeT++.
- 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
- Define AODV Module: Create new .ned, .h, and .cc files for the AODV module.
- Handle AODV Packets: Execute handling for RREQ, RREP, RERR, and optionally Hello packets.
- Route Discovery and Maintenance: Execute the route discovery and maintenance mechanisms.
Step 4: Integrate with INET Framework
- Extend Routing Functionality: To include AODV, we have to expand the INET routing functionality.
- Packet Format: In the INET framework, we have to state the packet format for AODV packets.
- Simulation Model: Amend or create network simulation models to include AODV-enabled nodes.
Step 5: Simulation and Testing
- Configure Network: Set up a test network configuration using .ned files to describe the network topology.
- Simulation Parameters: Define parameters for simulation that has timings for RREQs, RREPs, and RERRs.
- Run Simulations: Examine the behavior ADOV in various network conditions by executing simulations.
- Analyze Results: Analyze results to check the correct implementation of the AODV protocol.
Step 6: Debug and Optimize
- Debugging: Use OMNeT++’s debugging tools to troubleshoot issues.
- 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!