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How to Calculate Network Routing hop count in omnet++

To calculate the network routing hop count in OMNeT++ has needs to determine the number of intermediate nodes (hops) a packet traverses from the source to the destination and these parameters is critical for measuring the effectiveness of routing protocols and network topology. Here, we provide how to calculate the routing hop count in OMNeT++:

Step-by-Step Implementation:

  1. Modify the Packet Definition:
  • Initially, make sure that the packets being transferred across the network that can carry the data about the hop count. If using a custom packet type, we need to add a hop count field to the packet structure.

Example:

  • If we are using INET or a similar framework, we need to extend an existing packet type.

packet MyPacket {

int hopCount = 0; // Field to track hop count

}

  1. Increment Hop Count:
  • In the node’s routing logic, increment the hop count each time the packet is forwarded by a node.

Example in C++:

  • The particular routing function to increase the hop count before forwarding the packet or adjust the handleMessage function.

virtual void forwardPacket(cPacket *pkt) {

// Assuming pkt is of type MyPacket or derived

MyPacket *myPkt = check_and_cast<MyPacket *>(pkt);

// Increment the hop count

myPkt->setHopCount(myPkt->getHopCount() + 1);

// Forward the packet to the next node

send(myPkt, “out”);

}

  1. Track and Record Hop Count:
  • When the packet extents its destination, we need to record the hop count using OMNeT++’s statistics features.

Example in C++:

  • At the destination node like a sink node in a sensor network, we need to manage the packet as follows:

virtual void handleMessage(cMessage *msg) override {

MyPacket *myPkt = check_and_cast<MyPacket *>(msg);

// Record the hop count

recordScalar(“Hop Count”, myPkt->getHopCount());

// Process the packet (e.g., extract data, generate response, etc.)

}

  1. Aggregate Hop Counts:
  • If we want to compute the average hop count for multiple packets or across the whole network, we need to aggregate the hop counts at the destination.

int totalHopCount = 0;

int numPacketsReceived = 0;

virtual void handleMessage(cMessage *msg) override {

MyPacket *myPkt = check_and_cast<MyPacket *>(msg);

// Aggregate hop counts

totalHopCount += myPkt->getHopCount();

numPacketsReceived++;

// Calculate average hop count

double averageHopCount = (double)totalHopCount / numPacketsReceived;

// Record the average hop count

recordScalar(“Average Hop Count”, averageHopCount);

// Process the packet

}

  1. Configure Simulation:
  • Make sure that omnetpp.ini is configured to observe these statistics. We need to set up scenarios with varying network sizes, traffic patterns, and mobility to see how these factors influence hop count.

Example Configuration in omnetpp.ini:

*.node[*].**.recordScalar(“Hop Count”);

*.node[*].**.recordScalar(“Average Hop Count”);

  1. Analyse Results:
  • After running the simulation, use OMNeT++’s analysis tools to investigate the recorded hop counts. We need to visualize the distribution of hop counts, measure the average hop count, or compare hop counts across various network scenarios.
  1. Optional: Advanced Tracking:
  • If we want to evaluate hop count in diverse scenarios like diverse routes taken by packets, different protocols that consider logging the hop count along with added metadata such as source-destination pairs, timestamps.

Example in omnetpp.ini:

*.node[*].**.recordHistogram(“Hop Count Histogram”);

These techniques will permits to calculate and measure the routing hop count in OMNeT++ simulations and it delivers the valuable insights about how it effectively performs the routing protocols and the network topology. If you need additional information regarding the routing hops count we will provide that too.

We present the results of simulation performance concerning Network Routing hop count utilizing the OMNeT++ tool. Get our tailored research experience, we encourage you to contact us. Our team of experts, equipped with advanced tools, is prepared to support your research endeavors.

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