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How to Implement Grid Topology in OMNeT++

To implement the grid topology in OMNeT++ needs to includes making network where the nodes are organized in a grid-like structure, with each node connected to its neighbouring nodes in two-dimensional lattice. It is frequently used in wireless sensor networks, robotics, or mesh networks.

Please contact us for further assistance regarding performance analysis and project topics in this field. Additionally, you can receive implementation and simulation support for Grid Topology in the OMNeT++ tool from the developers at omnet-manual.com.

Given below is a procedure helps how to implement a grid topology in OMNeT++ using the INET framework:

Step-by-Step Implementations:

  1. Set up OMNeT++ and INET Framework
  • Make sure that OMNeT++ and the INET framework are installed and correctly configured. The INET framework offers the required modules for simulating many network topologies, involves grid networks.
  1. Define the Grid Topology in a NED File
  • Make a .ned file to describe the network topology. Each node is connected to its immediate neighbours, creating a grid in a grid topology.

Example:

package gridTopologyExample;

import inet.node.inet.StandardHost;

import inet.linklayer.ppp.Ppp;

network GridTopology

{

parameters:

int rows = default(3);  // Number of rows in the grid

int cols = default(3);  // Number of columns in the grid

submodules:

node[rows][cols]: StandardHost {

parameters:

@display(“p=100+200*j,100+200*i”);

}

connections allowunconnected:

// Connect each node to its neighbors in a grid pattern

for i=0..rows-1 {

for j=0..cols-1 {

if (i < rows-1) node[i][j].pppg++ <–> Ppp <–> node[i+1][j].pppg++;  // Vertical connection

if (j < cols-1) node[i][j].pppg++ <–> Ppp <–> node[i][j+1].pppg++;  // Horizontal connection

}

}

}

  • In this example:
    • StandardHost denotes each node in the grid.
    • Ppp (Point-to-Point Protocol) connections are used to link neighbouring nodes both parallel and perpendicularly.
    • The nodes are arranged in a grid pattern using a nested loop to manage both rows and columns.
  1. Configure the Nodes in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the nodes, like IP addresses and the applications they will run.

Example:

[General]

network = gridTopologyExample.GridTopology

# Configure IP addresses

*.node[*][*].ipv4.arp.typename = “GlobalArp”

*.node[*][*].ppp[0].ipv4.address = “10.0.0.x”

*.node[*][*].ppp[0].ipv4.netmask = “255.255.255.0”

# Example application setup: a node in the top-left corner sends data to a node in the bottom-right corner

*.node[0][0].numApps = 1

*.node[0][0].app[0].typename = “UdpBasicApp”

*.node[0][0].app[0].destAddresses = “10.0.0.9”  # IP address of node[2][2]

*.node[0][0].app[0].destPort = 5000

*.node[0][0].app[0].messageLength = 1024B

*.node[0][0].app[0].sendInterval = 1s

*.node[2][2].numApps = 1

*.node[2][2].app[0].typename = “UdpSink”

*.node[2][2].app[0].localPort = 5000

  • In this example:
    • node[0][0] in the top-left corner of the grid is configured to send UDP packets to node[2][2] in the bottom-right corner.
    • node[2][2] is configured to receive and process the packets.
  1. Run the Simulation
  • Compile and run the simulation in OMNeT++ after setting up the network topology and configuration. We should see nodes arranged in a grid pattern, with data being transmitted across the grid.
  1. Analyze the Results
  • Use OMNeT++’s built-in tools to visualize and analyse the network traffic. Observe how data is transmitted across the grid, the latency included in reaching various nodes, and how the network manages traffic.
  1. Enhancements and Variations
  • Bidirectional Communication: Set up bidirectional communication where nodes can receive and send data from all their neighbours.
  • Performance Analysis: Calculate the performance of the network in terms of throughput, latency, and packet loss under various traffic conditions.
  • Fault Tolerance: Mimic a scenario where one of the nodes or links fails and watch how the network reroutes traffic and maintains connectivity.

Example Files

  1. GridTopology.ned: Describes the grid topology.
  2. omnetpp.ini: Encompasses configuration settings for the simulation.

In conclusion, we had perform how to execute Grid Topology in OMNeT++ using INET framework. We will offer further details as per your needs.