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How to Implement Bluetooth Topology in OMNeT++

To implement the Bluetooth topology in OMNeT++ requires to include simulating a network where devices communicate using Bluetooth, usually ordered in a piconet or scatternet configuration. A piconet contains of one master and numerous slave devices, while a scatternet is made by connecting many piconets.

While OMNeT++ and the INET framework do not offer native help for Bluetooth, we can execute a Bluetooth-like topology by modifying modules or using existing wireless communication modules to approximate Bluetooth behaviour. Given below is a simple procedure to implement a simple Bluetooth topology, assuming we want to simulate a piconet.

Step-by-Step Implementations:

  1. Set up OMNeT++ and INET Framework
  • Make sure that OMNeT++ and the INET framework are installed and correctly configured. We may want to make custom modules or adapt existing wireless modules to mimic Bluetooth-specific behaviour like master-slave communication.
  1. Define the Bluetooth Topology in a NED File
  • Make a .ned file to describe the network topology. A simple piconet consists of one master and numerous slave devices.

Example: A Simple Bluetooth Piconet with One Master and Three Slaves

package bluetoothTopologyExample;

import inet.node.inet.StandardHost;

import inet.physicallayer.common.packetlevel.RadioMedium;

network BluetoothPiconet

{

parameters:

int numSlaves = default(3);  // Number of slave devices in the piconet

submodules:

radioMedium: RadioMedium {

@display(“p=100,100”);

}

master: StandardHost {

parameters:

@display(“p=200,200”);

@networkNode;

mobility.typename = “StationaryMobility”;  // Bluetooth devices typically don’t move

wlan[0].typename = “AdhocHost”;  // Simulate Bluetooth with a custom wireless interface

}

slave[numSlaves]: StandardHost {

parameters:

@display(“p=200+100*i,400”);

@networkNode;

mobility.typename = “StationaryMobility”;

wlan[0].typename = “AdhocHost”;

}

connections allowunconnected:

// No wired connections; communication is via the wireless medium

}

  • Master Device: The central controller of the piconet.
  • Slave Devices: Devices that communicate with the master within the piconet.
  • RadioMedium: Denotes the shared wireless medium, mimicking Bluetooth’s frequency hopping spread spectrum (FHSS) and low-power transmission.
  1. Configure the Nodes in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the Bluetooth nodes, like IP addresses, wireless channel parameters, and the applications will run.

Example:

[General]

network = bluetoothTopologyExample.BluetoothPiconet

# Configure IP addresses for the nodes

*.master.wlan[0].ipv4.address = “10.0.0.1”

*.slave[*].wlan[0].ipv4.address = “10.0.0.x”

*.master.wlan[0].ipv4.netmask = “255.255.255.0”

*.slave[*].wlan[0].ipv4.netmask = “255.255.255.0”

# Configure wireless settings to approximate Bluetooth

*.master.wlan[0].radio.transmitter.communicationRange = 10m  # Bluetooth has a short range

*.slave[*].wlan[0].radio.transmitter.communicationRange = 10m

*.master.wlan[0].radio.transmitter.power = 2mW

*.slave[*].wlan[0].radio.transmitter.power = 2mW

*.master.wlan[0].radio.transmitter.bandwidth = 1Mbps  # Bluetooth has a low bandwidth

*.slave[*].wlan[0].radio.transmitter.bandwidth = 1Mbps

# Example application setup: master communicates with each slave

*.master.numApps = 1

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

*.master.app[0].destAddresses = “10.0.0.2 10.0.0.3 10.0.0.4”  # IP addresses of slaves

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

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

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

*.slave[*].numApps = 1

*.slave[*].app[0].typename = “UdpSink”

*.slave[*].app[0].localPort = 5000

  • Wireless Settings: Modify settings like power, range, and bandwidth to inexact Bluetooth’s characteristics.
  • Applications: The master communicates with all slaves, mimicking the Bluetooth piconet communication.
  1. Simulate Bluetooth-Specific Behaviour
  • Master-Slave Communication: Only the master can initiate communication in a Bluetooth piconet. Slaves react to the master’s requests. We can simulate this behaviour using application-level logic or custom protocols.
  • Frequency Hopping: While OMNeT++ does not natively help Bluetooth’s frequency hopping, we can mimic it by occasionally shifting channels or using a simplified model of interference and retransmissions.
  1. Run the Simulation
  • Compile and run the simulation in OMNeT++ after setting up the network topology and configuration. Examine how the master communicates with the slaves, mimicking the behaviour of a Bluetooth piconet.
  1. Analyse the Results
  • To visualize and analyse the network traffic by using OMNeT++’s built-in tools. Observe how data is transmitted among the master and slaves, how the wireless medium is used, and how the network performs under different conditions, like varying node density or mobility (if any).
  1. Enhancements and Variations
  • Scatternet Simulation: Encompass the piconet to a scatternet by inserting more piconets and interconnecting them over bridge devices where the nodes that belong to multiple piconets.
  • Interference and Noise: Mimic interference and noise to learn their impact on Bluetooth communication.
  • Energy Efficiency: Bluetooth is a low-power technology, so consider simulating energy consumption and enhancing communication to conserve energy.

Example Files

  1. BluetoothPiconet.ned: Describes the Bluetooth piconet topology.
  2. omnetpp.ini: Encompasses configuration settings for the simulation.

Overall, we had learn how to define Bluetooth topology in NED file, simulate Bluetooth specific behaviour, visualize the outcomes, and example files to execute Bluetooth Topology in OMNeT++.

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