How to Start DTN Protocols Projects Using OMNeT++

To start Delay Tolerant Network (DTN) Protocols projects using OMNeT++, we need to replicate the networks in which connectivity is intermittent or where there is a requirement for managing high delays and disruptions. DTN protocols like Epidemic Routing, Spray and Wait, and Prophet Routing, are generally utilised within challenging environments such as disaster recovery, space interactions, and vehicular ad hoc networks (VANETs).

Below is a sequential approach to get started:

Steps to Start DTN Protocols Projects in OMNeT++

  1. Understand DTN Protocols
  • Key Concepts:
    • Store-carry-forward interaction.
    • Opportunistic routing depends on the node mets.
    • Data persistence and retransmission lest of disruptions.
  • Common DTN Protocols:
    • Epidemic Routing: Nodes simulate and send messages to every node met.
    • Spray and Wait: Restrictions the volume of copies, saving resources.
    • Prophet Routing: According to the encounter history it utilises the delivery probabilities.
  1. Set Up OMNeT++
  • Install OMNeT++:
    • We should download and install the new version of OMNeT++ environment on the system.
    • Experiment the configuration by executing the sample simulations.
  • Install INET Framework:
    • INET framework offers support for wireless and mobile networking.
    • Copy GitHub repository to download the INET framework.
    • Execute and incorporate the INET framework including OMNeT++.
  1. Create a New OMNeT++ Project
  • Go to OMNeT++ IDE.
  • Create a New Project:
    • Choose File > New > OMNeT++ Project.
    • Name it to the project as DTNProtocolProject.
  • Connect the project to the INET framework:
    • Right-click the project then choose Properties > Project References, and confirm the INET framework.
  1. Design the DTN Network Topology
  • Make a DTN network topology to utilsie .ned file:

network DTNNetwork {

submodules:

node1: WirelessHost {

@display(“p=100,100”);

}

node2: WirelessHost {

@display(“p=300,100”);

}

node3: WirelessHost {

@display(“p=200,300”);

}

connections allowunconnected:

node1.wlanRadio++ <–> node2.wlanRadio++;

node2.wlanRadio++ <–> node3.wlanRadio++;

node3.wlanRadio++ <–> node1.wlanRadio++;

}

  1. Implement DTN Protocol Logic
  • Extend Existing Modules:
    • Make a custom DTN routing protocol module within C++ classes by prolonging the NetworkProtocol or Application modules of INET.
    • For message buffering and forwarding, we need to execute the store-carry-forward logic.
  • Example: Epidemic Routing:
    • In a buffer, save messages.
    • Opportunistically transmit messages to every encountered node.
    • Sustain a record of delivered messages preventing the redundant transmissions.
  1. Configure Mobility
  • Enable Mobility Models:
    • Integrate the mobility models to nodes to replicate the dynamic connectivity:

*.node*.mobility.mobilityType = “RandomWaypointMobility”

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

  1. Simulate Traffic
  • Insert traffic sources and destinations, making messages:

*.node1.applications[*].typename = “UdpBasicApp”

*.node1.applications[0].destAddress = “node3”

*.node1.applications[0].startTime = 10s

  1. Run and Debug the Simulation
  • Run the Simulation:
    • We need to monitor how messages are opportunistically sent.
  • Debugging:
    • Allow logging to observe the message exchanges and protocol operations using below command line:

*.node*.verbose = true

  1. Analyze Performance
  • Metrics to Measure:
    • Delivery ratio: We estimate the percentage of messages that are effectively distributed.
    • Latency: We need to calculate the duration to distribute the messages.
    • Overhead: Measure the volume of redundant transmissions.
  • Transfer outcomes into external OMNeT++’s analysis tools like Python or MATLAB for advanced processing.
  1. Extend the Project
  • Advanced Features:
    • Execute the resource constraints such as buffer size, energy.
    • We want to insert priority-based forwarding for critical messages.
    • Mimic hybrid protocols to integrate the DTN and traditional networking.
  • Scalability:
    • Experiment the protocol including diverse densities and mobility patterns in large-scale networks.
  • Security:
    • Integrate the aspects such as message encryption or verification for network security.

Example Project: Epidemic Routing in a Disaster Network

  1. To replicate rescue teams, we describe the mobile nodes.
  2. Execute the epidemic routing for message dissemination.
  3. We want to estimate the performance parameters such as delivery ratio, delay, and redundancy.

We have delivered an outlined structure, featuring OMNeT++-specific content such as simulation configuration and code snippets for replicating DTN Protocols projects. Feel free to ask for more insights on this project.

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