How to implement wireless routing protocol in OMNeT++
To implement a wireless routing protocol in OMNeT++ has numerous steps that includes setup the scenarios then familiarizing the particular wireless routing protocol. We need to implement, generating the protocol module and incorporate it with the INET framework, and validating it. The given below is the procedure to help you through this process using the Ad hoc On-Demand Distance Vector (AODV) protocol as an example.
Step-by-Step Implementation:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: Download and install the latest version of OMNeT++ from the OMNeT++
- Install INET Framework: Download and 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). Key concepts include:
- Route Requests (RREQs): Broadcast to discover routes.
- Route Replies (RREPs): Sent in response to RREQs.
- Route Errors (RERRs): Indicate link breakages.
- Hello Messages: Optional messages to identify link status to neighbours.
Step 3: Create the AODV Protocol Module
Define the Module in .ned File
Create a .ned file for the AODV protocol module.
simple AODV
{
parameters:
double helloInterval @unit(s) = default(1s);
double rreqRetryTimeout @unit(s) = default(2s);
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Implement the Module in C++
Create the corresponding .cc and .h files.
AODV.h
#ifndef __AODV_H_
#define __AODV_H_
#include <omnetpp.h>
#include “inet/networklayer/contract/IRoutingTable.h”
#include “inet/networklayer/common/L3AddressResolver.h”
#include “inet/networklayer/ipv4/IPv4Datagram.h”
#include “inet/routing/extras/base/ManetRoutingBase.h”
#include <map>
using namespace omnetpp;
using namespace inet;
class AODV : public ManetRoutingBase
{
private:
double helloInterval;
double rreqRetryTimeout;
IRoutingTable *routingTable;
cMessage *helloMsg;
cMessage *rreqRetryMsg;
std::map<int, L3Address> rreqCache; // Cache for RREQs to prevent flooding
protected:
virtual void initialize(int stage) override;
virtual void handleMessage(cMessage *msg) override;
void sendHello();
void processHello(cMessage *msg);
void sendRREQ();
void processRREQ(cMessage *msg);
void sendRREP();
void processRREP(cMessage *msg);
void processRERR(cMessage *msg);
public:
AODV();
virtual ~AODV();
};
#endif
AODV.cc
#include “AODV.h”
Define_Module(AODV);
AODV::AODV()
{
helloMsg = nullptr;
rreqRetryMsg = nullptr;
}
AODV::~AODV()
{
cancelAndDelete(helloMsg);
cancelAndDelete(rreqRetryMsg);
}
void AODV::initialize(int stage)
{
if (stage == INITSTAGE_ROUTING_PROTOCOLS) {
helloInterval = par(“helloInterval”);
rreqRetryTimeout = par(“rreqRetryTimeout”);
routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);
helloMsg = new cMessage(“sendHello”);
rreqRetryMsg = new cMessage(“sendRREQRetry”);
scheduleAt(simTime() + helloInterval, helloMsg);
}
}
void AODV::handleMessage(cMessage *msg)
{
if (msg == helloMsg)
{
sendHello();
scheduleAt(simTime() + helloInterval, helloMsg);
}
else if (msg == rreqRetryMsg)
{
sendRREQ();
scheduleAt(simTime() + rreqRetryTimeout, rreqRetryMsg);
}
else if (strcmp(msg->getName(), “RREQ”) == 0)
{
processRREQ(msg);
}
else if (strcmp(msg->getName(), “RREP”) == 0)
{
processRREP(msg);
}
else if (strcmp(msg->getName(), “RERR”) == 0)
{
processRERR(msg);
}
else if (strcmp(msg->getName(), “Hello”) == 0)
{
processHello(msg);
}
else
{
// Handle other messages
}
}
void AODV::sendHello()
{
cMessage *hello = new cMessage(“Hello”);
send(hello, “toNetworkLayer”);
}
void AODV::processHello(cMessage *msg)
{
// Implement processing of Hello message
delete msg;
}
void AODV::sendRREQ()
{
cMessage *rreq = new cMessage(“RREQ”);
// Implement RREQ details and send
send(rreq, “toNetworkLayer”);
}
void AODV::processRREQ(cMessage *msg)
{
// Implement processing of RREQ message
delete msg;
}
void AODV::sendRREP()
{
cMessage *rrep = new cMessage(“RREP”);
// Implement RREP details and send
send(rrep, “toNetworkLayer”);
}
void AODV::processRREP(cMessage *msg)
{
// Implement processing of RREP message
delete msg;
}
void AODV::processRERR(cMessage *msg)
{
// Implement processing of RERR message
delete msg;
}
Step 4: Integrate with Simulation Model
Incorporate your AODV module into a network simulation model.
Network Configuration .ned File
network AODVNetwork
{
submodules:
host1: StandardHost {
parameters:
@display(“p=100,100”);
}
host2: StandardHost {
parameters:
@display(“p=300,100”);
}
// Add more hosts as needed
connections:
host1.pppg++ <–> { @display(“m=100,100”); } <–> host2.pppg++;
}
omnetpp.ini Configuration
network = AODVNetwork
*.host*.pppg[*].queue.typename = “DropTailQueue”
*.host*.ipv4.routingTable = “inet.networklayer.routing.manet.Router”
*.host*.networkLayer.networkProtocol.typename = “IPv4NetworkLayer”
*.host*.transportLayer.tcp.typename = “Tcp”
*.host*.transportLayer.udp.typename = “Udp”
*.host*.application[*].typename = “UdpBasicApp”
*.host*.application[*].destAddresses = “host1” // Set destination as needed
*.host*.application[*].destPort = 2000
*.host*.application[*].startTime = uniform(0s, 10s)
*.host*.application[*].sendInterval = uniform(1s, 2s)
*.host*.application[*].packetLength = 512B
*.host*.app[0].typename = “AODV”
Step 5: Test and Debug
- Run Simulations: Execute simulations to validate the behaviour of AODV module under numerous network conditions.
- Analyse Results: Verify the correctness and performance of implementation.
- Debugging: Use OMNeT++’s debugging tools to troubleshoot any issues.
We had understand how to deploy the wireless routing protocol in OMNet++ simulator that has generate the AODV module then implement the AODV protocol then deploy in the network.
So finally we hope that you have learned how to set up and run simulations for wireless routing protocols, such as the AODV protocol in OMNeT++. We analyze all simulation results, so reach out to us for the best outcomes.