How to Implement gpsr protocol in OMNeT++
To implement the GPSR (Greedy Perimeter Stateless Routing) protocol in OMNeT++ contains several steps, including considerate GPSR, set up the OMNeT++ and INET outline situation, creating GPSR modules, joining them into the INET framework, and testing. The below process is to implement GPSR in OMNeT++ by using the INET framework.
Step-by-Step Implementations:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++: We need to download and install the newest version of it from the OMNeT++
- Install INET Framework: From the INET repository to download and install.
Step 2: Understand GPSR Protocol
GPSR is a geographical moving practice for wireless networks. This is the uses of the positions of routers and a packet’s end point to create packet forwarding conclusions. The protocol needs two main modes:
- Greedy Mode: Forward the packet to the neighbour nearby to the destination.
- Perimeter Mode: Recycled when greedy furthering is not possible like local minimum; packets are forwarded everywhere the border of the vacuum.
Step 3: Create the GPSR Protocol Module
Define the Module in .ned File
To generate a .ned file for the GPSR protocol module.
simple GPSR
{
parameters:
@display(“i=block/cogwheel”);
double beaconInterval @unit(s) = default(1s); // Interval for sending beacons
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Implement the Module in C++
Make the corresponding .cc and .h files.
GPSR.h
#ifndef __GPSR_H_
#define __GPSR_H_
#include <omnetpp.h>
#include “inet/networklayer/contract/IRoutingTable.h”
#include “inet/common/geometry/common/Coord.h”
#include “inet/common/geometry/common/GeographicCoordinateSystem.h”
#include <map>
using namespace omnetpp;
using namespace inet;
class GPSR : public cSimpleModule
{
private:
double beaconInterval;
IRoutingTable *routingTable;
cMessage *beaconMsg;
std::map<L3Address, Coord> neighborTable; // Stores the positions of neighbors
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void sendBeacon();
void processBeacon(cMessage *msg);
void handleDataPacket(cPacket *pkt);
void forwardGreedy(cPacket *pkt);
void forwardPerimeter(cPacket *pkt);
double calculateDistance(const Coord& pos1, const Coord& pos2);
public:
GPSR();
virtual ~GPSR();
};
#endif
GPSR.cc
#include “GPSR.h”
#include “inet/networklayer/common/L3AddressResolver.h”
Define_Module(GPSR);
GPSR::GPSR()
{
beaconMsg = nullptr;
}
GPSR::~GPSR()
{
cancelAndDelete(beaconMsg);
}
void GPSR::initialize()
{
beaconInterval = par(“beaconInterval”);
routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);
beaconMsg = new cMessage(“sendBeacon”);
scheduleAt(simTime() + beaconInterval, beaconMsg);
}
void GPSR::handleMessage(cMessage *msg)
{
if (msg == beaconMsg)
{
sendBeacon();
scheduleAt(simTime() + beaconInterval, beaconMsg);
}
else if (strcmp(msg->getName(), “Beacon”) == 0)
{
processBeacon(msg);
}
else if (dynamic_cast<cPacket *>(msg))
{
handleDataPacket(check_and_cast<cPacket *>(msg));
}
else
{
// Handle other messages
}
}
void GPSR::sendBeacon()
{
cMessage *beacon = new cMessage(“Beacon”);
// Add position information to the beacon message
Coord myPos = getParentModule()->getSubmodule(“mobility”)->par(“coord”);
beacon->addPar(“x”) = myPos.x;
beacon->addPar(“y”) = myPos.y;
send(beacon, “toMacLayer”);
}
void GPSR::processBeacon(cMessage *msg)
{
// Process received beacon message
L3Address sender = L3AddressResolver().resolve(msg->getSenderModule()->getFullPath().c_str());
Coord senderPos(msg->par(“x”).doubleValue(), msg->par(“y”).doubleValue());
neighborTable[sender] = senderPos;
delete msg;
}
void GPSR::handleDataPacket(cPacket *pkt)
{
// Handle incoming data packets
// Decide whether to forward using greedy or perimeter mode
// Placeholder logic for choosing mode
forwardGreedy(pkt);
}
void GPSR::forwardGreedy(cPacket *pkt)
{
// Implement greedy forwarding logic
// Find the neighbor closest to the destination
L3Address dest = L3AddressResolver().resolve(pkt->getPar(“destAddr”).stringValue());
Coord destPos(pkt->par(“destX”).doubleValue(), pkt->par(“destY”).doubleValue());
Coord myPos = getParentModule()->getSubmodule(“mobility”)->par(“coord”);
L3Address bestNeighbor;
double minDist = calculateDistance(myPos, destPos);
for (auto &entry : neighborTable)
{
double dist = calculateDistance(entry.second, destPos);
if (dist < minDist)
{
bestNeighbor = entry.first;
minDist = dist;
}
}
if (bestNeighbor.isUnspecified())
{
forwardPerimeter(pkt);
}
else
{
send(pkt, “toMacLayer”);
}
}
void GPSR::forwardPerimeter(cPacket *pkt)
{
// Implement perimeter forwarding logic
// Placeholder for perimeter mode logic
}
double GPSR::calculateDistance(const Coord &pos1, const Coord &pos2)
{
return pos1.distance(pos2);
}
Step 4: Integrate with Simulation Model
Integrate the GPSR module into a network simulation model.
Network Configuration .ned File
network GPSRNetwork
{
submodules:
node1: StandardHost {
parameters:
@display(“p=100,100”);
}
node2: StandardHost {
parameters:
@display(“p=300,100”);
}
// Add more nodes as needed
connections:
node1.pppg++ <–> { @display(“m=100,100”); } <–> node2.pppg++;
}
omnetpp.ini Configuration
[General]
network = GPSRNetwork
*.node*.pppg[*].queue.typename = “DropTailQueue”
*.node*.ipv4.routingTable = “inet.networklayer.routing.manet.Router”
*.node*.networkLayer.networkProtocol.typename = “IPv4NetworkLayer”
*.node*.transportLayer.tcp.typename = “Tcp”
*.node*.transportLayer.udp.typename = “Udp”
*.node*.application[*].typename = “UdpBasicApp”
*.node*.application[*].destAddresses = “node1” // Set destination as needed
*.node*.application[*].destPort = 2000
*.node*.application[*].startTime = uniform(0s, 10s)
*.node*.application[*].sendInterval = uniform(1s, 2s)
*.node*.application[*].packetLength = 512B
*.node*.app[0].typename = “GPSR”
Step 5: Test and Debug
- Run Simulations: Complete simulations to test the events of the GPSR module in many network settings.
- Analyse Results: Validate the correctness and performance of the implementation.
- Debugging: By using the OMNeT++’s debugging tools to troubleshoot any problems.
Finally, we are complete that, how to execute the GPSR Protocol in OMNeT++. Here, we see the step-by-step procedure for implement the GPSR protocol and some coding in OMNeT++. For further simulation an implementation references, we can help you by providing materials.