How to Calculate Network Traveling path length in omnet++
To calculate the network traveling path length in OMNeT++, has need to monitor the path taken by packets or messages as they traverse via the network. The path length is measured either one in terms of the number of hops (nodes traversed) or the total distance covered. The below are the procedures on how to implement this in OMNeT++:
Step-by-Step Implementation:
- Define the Path Tracking Mechanism
We need to adjust message class to keep monitor the path and this can be completed by adding a custom field to the message to store the number of hops or by keeping monitor the node IDs that the message passes through.
Example: Using Message Fields
We need to generate a custom message class that contains a counter for the number of hops:
class MyMessage : public cMessage {
private:
int hopCount;
std::vector<int> path; // Optional: Store the path as node IDs
public:
MyMessage(const char *name = nullptr) : cMessage(name) {
hopCount = 0;
}
void incrementHopCount() {
hopCount++;
}
int getHopCount() const {
return hopCount;
}
void addToPath(int nodeId) {
path.push_back(nodeId);
}
const std::vector<int>& getPath() const {
return path;
}
};
- Update the Path as the Message Travels
As the message is forwarded from one node to the next, we should increment the hop count and, optionally, add the node ID to the path.
void MyNode::handleMessage(cMessage *msg) {
MyMessage *mymessage = check_and_cast<MyMessage *>(msg);
// Increment hop count and update path
mymessage->incrementHopCount();
mymessage->addToPath(getId());
// Forward the message to the next node
send(mymessage, “out”);
}
- Calculate the Path Length
After the message reaches its destination, we need to retrieve the hop count to regulate the path length. If you are monitoring the actual path (node IDs), we need to compute the total physical distance if necessary.
void MyNode::handleMessage(cMessage *msg) {
MyMessage *mymessage = check_and_cast<MyMessage *>(msg);
if (isDestinationNode()) {
int pathLength = mymessage->getHopCount();
EV << “Message traveled ” << pathLength << ” hops” << endl;
// Optionally, calculate the physical distance based on the path
double totalDistance = calculatePhysicalDistance(mymessage->getPath());
EV << “Total physical distance: ” << totalDistance << ” units” << endl;
// Record or emit the path length for analysis
emit(pathLengthSignal, pathLength);
} else {
mymessage->incrementHopCount();
mymessage->addToPath(getId());
// Forward the message to the next node
send(mymessage, “out”);
}
}
- Calculate Physical Distance (Optional)
If we need to compute the physical distance travelled, we can do so by iterating over the path and summing the distances among the consecutive nodes. This needs knowing the coordinates of each node.
double MyNode::calculatePhysicalDistance(const std::vector<int>& path) {
double totalDistance = 0.0;
for (size_t i = 1; i < path.size(); i++) {
cModule *prevNode = getSimulation()->getModule(path[i – 1]);
cModule *currentNode = getSimulation()->getModule(path[i]);
double dx = currentNode->par(“x”).doubleValue() – prevNode->par(“x”).doubleValue();
double dy = currentNode->par(“y”).doubleValue() – prevNode->par(“y”).doubleValue();
double distance = sqrt(dx * dx + dy * dy);
totalDistance += distance;
}
return totalDistance;
}
- Emit or Record the Path Length
We need to release the path length as a signal or record it as a scalar for later analysis:
simsignal_t pathLengthSignal;
void initialize() override {
pathLengthSignal = registerSignal(“pathLength”);
}
void finish() override {
// Optionally, aggregate or analyze path lengths here
}
- Run the Simulation and Analyse the Results
After implementing the above code, execute the simulation. We need to use OMNeT++’s built-in analysis tools to plot or evaluate the path lengths. For instance we can visualize the distribution of path lengths across diverse messages or scenarios.
Example Scenario
The given below is the sample of how the code might look in a simple OMNeT++ module:
class MyNode : public cSimpleModule {
private:
simsignal_t pathLengthSignal;
protected:
virtual void initialize() override {
pathLengthSignal = registerSignal(“pathLength”);
}
virtual void handleMessage(cMessage *msg) override {
MyMessage *mymessage = check_and_cast<MyMessage *>(msg);
if (isDestinationNode()) {
int pathLength = mymessage->getHopCount();
EV << “Message traveled ” << pathLength << ” hops” << endl;
emit(pathLengthSignal, pathLength);
} else {
mymessage->incrementHopCount();
mymessage->addToPath(getId());
// Forward the message to the next node
send(mymessage, “out”);
}
}
bool isDestinationNode() {
// Define logic to check if this node is the destination
return false; // Placeholder
}
};
- Post-Simulation Analysis
After the simulation, use OMNeT++’s tools or export the outcomes to measure the path lengths. This information can offer the insights into the effectiveness of routing protocols, network congestion, or other factors influencing path lengths.
As we discussed earlier about how the network traveling path length will perform in OMNeT++ simulation and we help to provide further information about how the network traveling path length will adapt in different environments.
To determine the network traveling path length using the OMNeT++ tool for your research endeavors, it is essential to provide our developers with the specific parameter details. We will ensure you receive the most optimal guidance for exceptional results.