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How to Calculate Network Load and Hop Count in omnet++

To calculate the network load and hop count in OMNeT++, we need to build a simulated network to record the metric when the simulation run. We offered the implementation process to calculate the Network Load and Hop count:

Step-by-Step Implementation:

  1. Network Load Calculation:

Network load indicates to the amount of data being communicated via the network over a given period. To calculate it in OMNeT++, we usually record the number of data (in bytes) transmitted over the network.

Steps:

  • Define Variables:
    • To store the total number of data transmitted, we have to create a variable in the .ned file or inside the network node modules.

long totalBytesSent;

  • Track Data Sent:
    • Within the node modules (like routers, hosts), track the size of every packet sent and aggregate this in the totalBytesSent variable.

totalBytesSent += packet->getByteLength();

  • Calculate Network Load:
    • The network load can be estimated by means of the total bytes sent divided by the simulation time.

double networkLoad = totalBytesSent / simTime().dbl();

  • Record the Result:
    • Log the network load at the end of the simulation by using OMNeT++’s statistics recording feature to log the network load.

recordScalar(“Network Load”, networkLoad);

  1. Hop Count Calculation:

Hop count means the number of intermediate devices (like routers or switches) a packet crosses to reach its destination.

Steps:

  • Add Hop Count Field to Packets:
    • Alter the packet definition to contain a hop count field, which raises each time when the packet is forwarded.

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

  • Track Hop Count at Destination:
    • For analysis, we have to log the hop count during the packet arrive its destination.

int hopCount = packet->getHopCount();

recordScalar(“Hop Count”, hopCount);

  • Aggregate Hop Counts:
    • If we need an average hop count over multiple packets, sum the hop counts of all received packets and divide by the number of packets.

totalHopCount += hopCount;

numPacketsReceived++;

double averageHopCount = totalHopCount / numPacketsReceived;

    • Record this value at the end of the simulation.

recordScalar(“Average Hop Count”, averageHopCount);

  1. Simulation Setup:

To record these metric by make sure the simulation is properly configured:

  • .ned file:
    • State the network topology to make sure that the structure permits for realistic data flow and routing.
  • omnetpp.ini:
    • Build the parameters like simulation time, network traffic patterns, and other configurations that might impact network load and hop count.
  1. Run the Simulation:
  • Run the simulation after setting up the network and the metrics you want to track.
  • Analyze the network load and hop count by using in-built tools of OMNeT++ or export the results.
  1. Post-Processing:
  • Use tools like MATLAB, Python or R for deeper insights to analyze the aggregated data for further processing.

At the end of this demonstration, we provided the useful information of how to calculate Network Load and Hop Count in OMNeT++ with step-by-step approach. For further needs, we can also provide them through another simulation.

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