How to Implement network Relocation in OMNeT++
To implement the network relocation in OMNeT++, we have to simulate a situation contains nodes in a network varying their positions, impacting the topology of the network and possibly its performance. It is natural in mobile networks, dynamic sensor networks and other situations where nodes travel are relocated. We offered the demonstration process to implement it in the following below with samples:
Step-by-Step Implementation:
- Understand Network Relocation
Network relocation typically contains:
- Node Movement: Nodes varying their positions based on the predefined patterns or random movements.
- Impact on Network: Changes in topology can influence routing, communication, and entire network performance.
- Set Up OMNeT++ Environment
Make certain that OMNeT++ and the INET framework are installed. OMNeT++ offers the simulation environment, and INET offered network models that you can extend for relocation scenarios.
- Create a New OMNeT++ Project
Open OMNeT++ and develop a new project for network relocation simulation.
- Define Network Topology
Build the network components and their connectivity in .ned files. Contain nodes that will travel or be relocated.
Example:
network NetworkRelocation
{
submodules:
node1: RelocatingNode {
@display(“i=node”);
}
node2: RelocatingNode {
@display(“i=node”);
}
node3: RelocatingNode {
@display(“i=node”);
}
connections:
node1.out –> node2.in;
node2.out –> node3.in;
node1.out –> node3.in;
}
- Define Relocating Node
State a module for the relocating nodes that has functionality for movement and location updates.
Example:
simple RelocatingNode
{
parameters:
double moveInterval = 10s; // Interval for relocating the node
double xStart = 0; // Initial x position
double yStart = 0; // Initial y position
double speed = 5m/s; // Speed of movement
gates:
inout in;
inout out;
}
- Implement Relocation Logic
For node relocation, execute the logic in the node’s C++ code. It encompasses updating the node’s position based on its speed and trajectory, and capably notifying other nodes or fine-tuning connections.
Example:
class RelocatingNode : public cSimpleModule
{
private:
double moveInterval;
double xPosition;
double yPosition;
double speed;
cMessage *moveMsg;
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void relocateNode();
public:
// Method to get current position
std::tuple<double, double> getPosition() const;
};
void RelocatingNode::initialize()
{
moveInterval = par(“moveInterval”);
xPosition = par(“xStart”);
yPosition = par(“yStart”);
speed = par(“speed”);
moveMsg = new cMessage(“move”);
scheduleAt(simTime() + moveInterval, moveMsg); // Schedule initial movement
}
void RelocatingNode::handleMessage(cMessage *msg)
{
if (msg == moveMsg) {
relocateNode();
scheduleAt(simTime() + moveInterval, moveMsg); // Schedule next move
} else {
// Handle other messages
}
}
void RelocatingNode::relocateNode()
{
// Update position based on speed and direction
// For simplicity, move in a straight line (adjust as needed)
xPosition += speed;
yPosition += speed;
// Optionally update position in network topology
// Notify other nodes or adjust connections if needed
}
std::tuple<double, double> RelocatingNode::getPosition() const
{
return std::make_tuple(xPosition, yPosition);
}
- Configure Simulation Parameters
Modify the omnetpp.ini file to fix parameters related to node relocation like movement intervals, speeds, and initial positions.
Example:
[Config NetworkRelocation]
network = NetworkRelocation
**.node1.moveInterval = 15s
**.node2.moveInterval = 20s
**.node3.moveInterval = 10s
**.node1.speed = 5m/s
**.node2.speed = 6m/s
**.node3.speed = 4m/s
- Run the Simulation
Compile and run the simulation. Monitor how node relocations affect network performance like connectivity, data routing, and network throughput.
- Analyze Results
Compute performance metrics like:
- Connectivity: Influence of node movement on network connectivity.
- Routing Efficiency: Varying in routing paths because of node relocations.
- Network Performance: Effects on data transfer rates, latency, and overall network performance.
Interpret the simulation results by using analysis tools and visualization features in OMNeT++.
We successfully provide the step-by-step procedure on how to set up, simulate the network which is required to implement the Network Relocation in OMNeT++ and we covered the evaluation process to enhance the network’s performance