How to Calculate Network Mobility Rate in omnet++

To calculate the network mobility rate in OMNeT++ has needs to encompass following the movement of nodes in the network over time. The mobility rate usually mentions to how fast or often nodes modify their position in the simulation environment.

Steps to Calculate Network Mobility Rate in OMNeT++:

1. Implement Node Mobility:
   • Make sure that the nodes in the network are mobile. OMNeT++ helps mobility through modules like MobilityBase, LinearMobility, CircleMobility, etc.
   • For example, to define mobility in a node, we might use:

@class(LinearMobility);

@display(“i=block/arrow”);

1. • Define parameters like speed, direction, and movement patterns in the .ned file or omnetpp.ini.
2. Track Node Position Changes:
   • We want to track the positions of nodes at various time intervals. During the simulation it can be done by accessing the position coordinates of the nodes Within the mobility module of each node, we can override the handleSelfMessage or handleMessage functions to track changes in position:

Coord currentPosition = getCurrentPosition(); // Get current position

1. • Store the first position and track any changes over time.
2. Calculate Mobility Rate:
   • The mobility rate can be described as the distance moved over a period of time or the rate of position changes.
   • For distance-based mobility rate:

double distanceMoved = currentPosition.distance(lastPosition);

double timeElapsed = simTime().dbl() – lastUpdateTime;

double mobilityRate = distanceMoved / timeElapsed; // in units per second

1. • Update lastPosition and lastUpdateTime after each calculation:

lastPosition = currentPosition;

lastUpdateTime = simTime().dbl();

1. Aggregate Mobility Rate:
   • If we are estimating the mobility rate for multiple nodes, we can aggregate the values to get an overall network mobility rate. This might be the average mobility rate across all nodes:

totalMobilityRate += mobilityRate;

nodeCount++;

double averageMobilityRate = totalMobilityRate / nodeCount;

1. • Otherwise, we might sum the distances moved by all nodes and divide by the total simulation time for a cumulative network mobility rate.
2. Record the Results:
   • Use OMNeT++’s statistics recording mechanisms to log the mobility rate.

recordScalar(“Node Mobility Rate”, mobilityRate);

1. • For network-wide metrics:

recordScalar(“Average Network Mobility Rate”, averageMobilityRate);

1. Simulation Setup and Execution:
   • Make sure that simulation environment in OMNeT++ is set up to contain the mobility model for nodes.
   • Configure the required parameters for mobility, like speed, direction, and patterns, in the omnetpp.ini file.
2. Post-Processing:
   • We can analyse the recorded mobility rates using OMNeT++’s built-in tools or export the data for more analysis using tools like Python, MATLAB, or R after running the simulation,.

Example Configuration in omnetpp.ini:

*.node[*].mobilityType = “LinearMobility”

*.node[*].mobility.speed = uniform(5mps, 10mps)

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

Overall, we are provided essential information, step-by-step procedure and some examples to calculate the Network Mobility Rate in OMNeT++. We will provide further details to implement this topic in various tool.

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