How to Calculate Network the velocity of the node in omnet++

To calculate the velocity of a node in OMNeT++ has needs to monitor the position of the node over time and calculating the speed that based on the distance travelled among the successive position updates. The given below are the detailed procedures on how to implement the velocity of a node in OMNeT++:

Step-by-Step Implementation:

1. Node Mobility Configuration:

• Make sure that nodes are configured with a mobility model, like LinearMobility, RandomWaypointMobility, etc., which permits the node to move inside the simulation.

Example in .ned file:

import inet.mobility.single.RandomWaypointMobility;

module MobileNode {

submodules:

mobility: RandomWaypointMobility {

parameters:

initialX = uniform(0m, 100m);

initialY = uniform(0m, 100m);

speed = uniform(1mps, 10mps); // Speed in meters per second

}

connections:

// Define other connections if necessary

}

2. Tracking Node Position:

• To compute the velocity, we need to occasionally test the node’s position and we can do this by accessing the node’s mobility module during the simulation.

Example in C++:

Coord previousPosition;

simtime_t previousTime;

virtual void initialize() override {

previousPosition = mobility->getCurrentPosition();

previousTime = simTime();

}

virtual void handleMessage(cMessage *msg) override {

// Obtain the current position

Coord currentPosition = mobility->getCurrentPosition();

simtime_t currentTime = simTime();

// Calculate the distance moved

double distanceMoved = previousPosition.distance(currentPosition);

// Calculate the time interval

double timeInterval = (currentTime – previousTime).dbl();

// Calculate the velocity

double velocity = distanceMoved / timeInterval;

// Record the velocity

recordScalar(“Node Velocity”, velocity);

// Update previous position and time for the next calculation

previousPosition = currentPosition;

previousTime = currentTime;

// Handle other message processing

}

3. Calculate Velocity:

• Velocity is computed as the distance travelled divided by the time taken. In the example above, the distanceMoved variable is intended using the distance() function, and the time interval is deliberate using the difference among the current and previous simulation times.
• Formula used:

Velocity=Distance MovedTime Interval\text{Velocity} = \frac{\text{Distance Moved}}{\text{Time Interval}}Velocity=Time IntervalDistance Moved​

4. Recording and Analysing Velocity:

• Record the calculated velocity using OMNeT++’s built-in statistics recording feature, as shown in the handleMessage function.
• We need to calculate the average velocity of a node over the simulation or measure the velocity at particular intervals.

Example Configuration in omnetpp.ini:

*.node[*].mobility.recordScalar(“velocity”);

*.node[*].mobility.updateInterval = 1s; // How often the position is updated

5. Simulation and Post-Processing:

• After running the simulation, we need to review the recorded velocity data to measure the movement patterns of nodes.
• Use OMNeT++’s analysis tools to visualize the velocity data, or export it for further processing in external tools such as Python, R, or MATLAB.

Example of .ned File Configuration:

simple MobileNode {

parameters:

@display(“i=block/circle”);

submodules:

mobility: RandomWaypointMobility {

parameters:

speed = uniform(1mps, 10mps); // Node speed between 1 and 10 meters per second

updateInterval = 1s;

}

}

Example of Configuration in omnetpp.ini:

*.node[*].mobility.updateInterval = 1s;

*.node[*].mobility.speed = uniform(1mps, 10mps);

*.node[*].mobility.recordScalar(“velocity”);

In this setup we will permit to compute and evaluate the velocity of nodes in OMNeT++ simulation that delivers insights into their movement characteristics within the network and Adjustments can be made depending on the particular mobility model and network scenario you’re working with. We will also provide the additional information regarding how the velocity of nodes will calculate in diverse simulation tool.

The developers at omnet-manual.com provide guidance on assessing the simulation performance of your project. For further assistance regarding network parameters, please share your specific details about the node velocity in the OMNeT++ tool