How to Implement Protocol Optimization in OMNeT++
To implement protocol optimization in OMNeT++ has needs to refining or optimizing an existing network protocol to enhance its performance, efficiency, or scalability and this could encompasses to modifying techniques, adjusting parameters, or executing the novel features that improve the protocol’s behaviour under particular conditions. The below are the procedures to implementing protocol optimization in OMNeT++ using the INET framework that contains an example scenario where we optimize a simple routing protocol.
Step-by-Step Implementation:
- Set up OMNeT++ and INET Framework
- Install OMNeT++: Make certain that OMNeT++ is installed and configured on system.
- Install INET Framework: Download and install the INET framework that offers models for numerous network protocols that contains the routing, transport, and application layers.
- Identify the Protocol to Optimize
Initially, decide which protocol we need to optimize. For this example, let’s enhance a basic routing protocol, like the Distance Vector Routing Protocol (DVRP). We will enhance its performance by executing the route caching to minimize the frequency of route broadcasts.
- Create the Network Topology
Generate a network topology where nodes use the routing protocol and this network will be the environment in which we verify the protocol optimization.
Example NED File (RoutingNetwork.ned):
package mynetwork;
import inet.node.inet.Router;
import inet.node.inet.StandardHost;
network RoutingNetwork
{
parameters:
int numNodes = default(5); // Number of nodes in the network
submodules:
node[numNodes]: StandardHost {
@display(“p=100,100;is=square,red”);
}
router: Router {
@display(“p=300,200”);
}
connections allowunconnected:
for i = 0..numNodes-1 {
node[i].ethg++ <–> ethernetLine <–> router.ethg++;
}
}
In this example:
- node[]: It denotes the network hosts that will use the optimized routing protocol.
- router: Acts as the central routing node facilitating interaction among the nodes.
- Implement the Protocol Optimization
In this sample, we will adapt a basic Distance Vector Routing Protocol (DVRP) by introducing route caching, which stores recently used routes to minimize the number of route broadcasts needed.
Example: Optimized Routing Protocol (OptimizedRoutingProtocol.ned)
package mynetwork;
import inet.applications.base.ApplicationBase;
simple OptimizedRoutingProtocol extends ApplicationBase
{
gates:
input upperLayerIn;
output upperLayerOut;
input lowerLayerIn;
output lowerLayerOut;
}
OptimizedRoutingProtocol.cc (Basic Implementation)
#include “inet/common/INETDefs.h”
#include “inet/applications/base/ApplicationBase.h”
#include <map>
Define_Module(OptimizedRoutingProtocol);
void OptimizedRoutingProtocol::initialize(int stage) {
ApplicationBase::initialize(stage);
if (stage == INITSTAGE_LOCAL) {
routeCacheTimeout = par(“routeCacheTimeout”).doubleValue();
routeCache.clear();
routingTimer = new cMessage(“routingTimer”);
scheduleAt(simTime() + par(“routingInterval”).doubleValue(), routingTimer);
}
}
void OptimizedRoutingProtocol::handleMessageWhenUp(cMessage *msg) {
if (msg == routingTimer) {
broadcastRouteUpdates();
scheduleAt(simTime() + par(“routingInterval”).doubleValue(), routingTimer);
} else if (msg->getArrivalGate() == lowerLayerIn) {
handleRoutingMessage(msg);
}
}
void OptimizedRoutingProtocol::broadcastRouteUpdates() {
EV << “Broadcasting route updates from node ” << getParentModule()->getIndex() << “\n”;
// Simulate broadcasting route updates
for (int i = 0; i < gateSize(“lowerLayerOut”); i++) {
cMessage *routeMsg = new cMessage(“RouteUpdate”);
routeMsg->addPar(“source”) = getParentModule()->getIndex();
send(routeMsg, “lowerLayerOut”, i);
}
}
void OptimizedRoutingProtocol::handleRoutingMessage(cMessage *msg) {
int sourceNode = msg->par(“source”);
// Check route cache before broadcasting
if (routeCache.find(sourceNode) != routeCache.end()) {
EV << “Using cached route for node ” << sourceNode << “\n”;
} else {
EV << “No cached route for node ” << sourceNode << “, updating cache\n”;
routeCache[sourceNode] = simTime();
broadcastRouteUpdates();
}
delete msg;
}
void OptimizedRoutingProtocol::finish() {
// Clean up and print final cache contents
cancelAndDelete(routingTimer);
EV << “Final route cache contents:\n”;
for (const auto &entry : routeCache) {
EV << “Node ” << entry.first << ” cached at time ” << entry.second << “\n”;
}
}
In this example:
- routeCache: A map that stores routes and the time they were cached.
- broadcastRouteUpdates(): Broadcasts route updates to other nodes, but only if the route is not already cached.
- handleRoutingMessage(): Validates if the route is in the cache; if not, it caches the route and broadcasts updates.
- Configure the Simulation
Configure the simulation in the omnetpp.ini file to use the optimized routing protocol.
Example Configuration in omnetpp.ini:
network = RoutingNetwork
**.node[*].applications[0].typename = “OptimizedRoutingProtocol”
**.node[*].applications[0].routingInterval = 10s # Time between routing updates
**.node[*].applications[0].routeCacheTimeout = 30s # Time before cache expires
- Run the Simulation
Run the simulation and monitor how the optimized routing protocol performs. Track the logs to see how frequently route updates are broadcast and how efficiently the route cache is utilized.
- Analyse the Optimization Results
After running the simulation, evaluate the performance enhancements brought by the optimization:
- Broadcast Frequency: Compare the frequency of route broadcasts before and after optimization.
- Latency: Extent the latency in route discovery and data transmission.
- Network Load: Monitor the reduction in network load because of fewer broadcasts.
- Extend the Optimization
We can expand the optimization by adding more advanced features, such as:
- Adaptive Cache Expiry: Dynamically regulate the cache expiry time based on network conditions.
- Selective Broadcasting: Execute selective broadcasting where only the most essntial updates are broadcast.
- Route Validation: Periodically test the cached routes to make sure they are still valid.
Example: Adaptive Cache Expiry
void OptimizedRoutingProtocol::handleRoutingMessage(cMessage *msg) {
int sourceNode = msg->par(“source”);
// Adaptive cache expiration based on network traffic
simtime_t now = simTime();
if (routeCache.find(sourceNode) != routeCache.end()) {
if (now – routeCache[sourceNode] > routeCacheTimeout) {
EV << “Route cache expired for node ” << sourceNode << “\n”;
routeCache[sourceNode] = now; // Refresh cache
broadcastRouteUpdates();
} else {
EV << “Using cached route for node ” << sourceNode << “\n”;
}
} else {
EV << “No cached route for node ” << sourceNode << “, updating cache\n”;
routeCache[sourceNode] = now;
broadcastRouteUpdates();
}
delete msg;
}
From the setting, we had successfully implemented the protocol optimization in OMNeT++ too that is used to enhance the performance of the network under the specific conditions. We also offer the information about protocol optimization. For top-notch research ideas and timely delivery, we’re your go-to partner. We specialize in all aspects of Protocol Optimization using the OMNeT++ tool, so you can count on us for customized services