How to Start Wireless Routing Protocol Projects Using OMNeT++

To start a wireless routing protocol project in OMNeT++, we follow series of steps, containing from installing OMNeT++ to setting up and replicating the wireless networks with the help of framework. Below is a sequential approach to get started:

Steps to Start Wireless Routing Protocol Projects in OMNeT++

  1. Install OMNeT++

OMNeT++ is an open-source separate event simulation framework designed to create the network simulators. We adhere to these steps to install OMNeT++:

  • Visit OMNeT++ website and download the new version of OMNeT++ on the system.
  • We follow the installation guidance based on the OS like Linux, macOS, or Windows.
  • Make sure that install the INET Framework that offers supports to models and protocols for replicating diverse network scenarios with wireless interaction and routing protocols.

After setting up, we can execute the OMNeT++ IDE.

  1. Set Up Your OMNeT++ Environment
  • Go to OMNeT++ IDE after installation.
  • Configure workspace that is where project files will be saved.
  • Make a new OMNeT++ project for routing protocol by navigating File > New > OMNeT++ Project.
  1. Install INET Framework (Optional but recommended for wireless projects)
  • INET framework is an extension of OMNeT++, which offers modules for wireless communication, IP-based networks, routing protocols, and so on.
  • We can be installed the INET framework through OMNeT++ IDE using Help > Install New Software, then inserting the INET repository URL.
  • On the other hand, we can be replicated the INET repository from GitHub:

git clone https://github.com/inet-framework/inet.git

  • We adhere to the INET documentation to execute and set it up.
  1. Create a Wireless Network Simulation

After set up OMNeT++ and the INET framework then we can make wireless network simulations.

  • Create a new simulation model:
    • Choose New > Other and select the OMNeT++ > OMNeT++ Model by right-clicking on the src folder within the project.
    • Make a new .ned file that is OMNeT++’s Network Description file for wireless network.
  • Define nodes and wireless interfaces: Describe the nodes of network using .ned file. Mimic wireless interaction among the nodes to utilise modules such as WirelessHost or RadioMedium (available in the INET framework) for wireless networks. Instance:

network WirelessNetwork

{

submodules:

node1: WirelessHost;

node2: WirelessHost;

node3: WirelessHost;

connections:

node1.wlan[0] <–> radio[0] <–> node2.wlan[0];

node2.wlan[0] <–> radio[0] <–> node3.wlan[0];

}

  1. Implement or Select a Routing Protocol

We can execute a custom wireless routing protocol or we utilise one protocol, which is previously offered by OMNeT++/INET. OMNeT++ and INET with numerous routing protocols for wireless networks like:

  • OLSR (Optimized Link State Routing)
  • RIPng (Routing Information Protocol next generation)
  • DSR (Dynamic Source Routing)
  • AODV (Ad-hoc On-demand Distance Vector)

To utilise an existing routing protocol:

  • It contains the protocol modules within .ned file and set up them depends on the simulation configuration.
  • For instance, make use of AODV, we would integrate something like:

*.node1.routingTableClass = “AODV”

For Custom Protocol Implementation:

  • We should make a new routing protocol using subclassing existing modules or executing a new one from scratch.
  • We can execute it within C++ by making new classes in the src folder. We will be executed the routing protocol logic within respective .cc files.
  • Execute the essential approaches for managing packet routing with sending, receiving, and forwarding routing messages such as route discovery and maintenance.
  1. Configure the Simulation Environment

In .ini files, OMNeT++ simulations are normally set up in which indicate the metrics like node configurations, network topology, and simulation runtime.

Example configuration file (omnetpp.ini):

network = WirelessNetwork

sim-time-limit = 100s

 

**.node1.mobility.initialX = 100

**.node1.mobility.initialY = 100

**.node2.mobility.initialX = 200

**.node2.mobility.initialY = 100

  • Configure mobility metrics like initialX, initialY, velocity, and so on, to replicate the realistic wireless environments.
  • Describe the routing metrics for wireless routing protocol such as AODV metrics like timeouts or buffer sizes.
  1. Run the Simulation

After setting up the project and also describing the metrics then we can execute the simulation:

  • Select the Run button within the OMNeT++ IDE.
  • Observe the result and confirm for routing performance parameters such as packet delivery ratio, latency, and throughput.
  1. Visualize Results

OMNeT++ environment offers built-in tools to envision simulation outcomes:

  • Canvas: Envision node mobility, wireless communication, and routing protocol activity using graphical canvas.
  • Simulation Results: Examine the simulation performance metrics such as throughput, delay, and so on, to utilise the Result Analysis Tool.
  1. Iterate and Improve

We can fine-tune the routing protocol according to the outcomes, modify network configurations, or improve the simulation model. OMNeT++ permits specifically for in-depth performance analysis and it also supports us to iteratively enhance the protocol.

  1. Extend Your Project
  • If we require testing with further aspects such as energy consumption, network scalability, or cross-layer optimizations then we can prolong the simulation including custom modules or features.
  • It provides valuable resources like OMNeT++ and INET documentation and examples to understand more.

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