How to Implement IEEE 802.11 Wi-Fi in ns2

To implement the IEEE 802.11 Wi-Fi using the tool NS2 (Network Simulator 2) that has to encompass setting up a wireless network including the nodes that communicate through the 802.11 MAC and PHY layers. This NS2 tool has built-in support for the 802.11, creating it rather straightforward to mimic a Wi-Fi network. In the below, we offered the entire implementation steps in ns2:

Step-by-Step Implementation:

  1. Set Up Your Environment:
  • Make sure NS2 is installed on the system.
  • We should also have NAM (Network Animator) installed that supports to visualize the network.
  1. Basic TCL Script Structure:
  • The simulation script will contain the making of nodes, setting up the wireless channel, and setup the 802.11 MAC/PHY layers.
  1. Create the Wireless Channel:
  • NS2 uses the set command to make the wireless channel and setup the network parameters.

# Define the simulator

set ns [new Simulator]

# Create a trace file

set tracefile [open out.tr w]

$ns trace-all $tracefile

# Create a NAM file for animation

set namfile [open out.nam w]

$ns namtrace-all-wireless $namfile 10

# Set up the channel and radio propagation model

set val(chan)   Channel/WirelessChannel  ;# Channel type

set val(prop)   Propagation/TwoRayGround ;# Radio-propagation model

set val(ant)    Antenna/OmniAntenna      ;# Antenna type

set val(ll)     LL                       ;# Link layer type

set val(ifq)    Queue/DropTail/PriQueue  ;# Interface queue type

set val(ifqlen) 50                       ;# Max packet in ifq

set val(netif)  Phy/WirelessPhy          ;# Network interface type

set val(mac)    Mac/802_11               ;# MAC type

set val(rp)     DSR                      ;# Routing protocol

# Configure the simulator

$ns node-config -adhocRouting $val(rp) \

-llType $val(ll) \

-macType $val(mac) \

-ifqType $val(ifq) \

-ifqLen $val(ifqlen) \

-antType $val(ant) \

-propType $val(prop) \

-phyType $val(netif) \

-channelType $val(chan) \

-topoInstance $topo \

-agentTrace ON \

-routerTrace ON \

-macTrace OFF \

-movementTrace OFF

  1. Create Wireless Nodes:
  • To make nodes that will performs as Wi-Fi devices.

# Create nodes

set n0 [$ns node]

set n1 [$ns node]

set n2 [$ns node]

# Set node positions

$n0 set X_ 5.0

$n0 set Y_ 5.0

$n0 set Z_ 0.0

$n1 set X_ 10.0

$n1 set Y_ 10.0

$n1 set Z_ 0.0

$n2 set X_ 15.0

$n2 set Y_ 15.0

$n2 set Z_ 0.0

  1. Define Traffic Sources and Sinks:
  • We can use the traffic agents such as UDP or TCP to mimic communication among the nodes.

# Create UDP agent and attach to n0

set udp0 [new Agent/UDP]

$ns attach-agent $n0 $udp0

# Create a CBR traffic source and attach to udp0

set cbr0 [new Application/Traffic/CBR]

$cbr0 set packetSize_ 1000

$cbr0 set interval_ 0.005

$cbr0 attach-agent $udp0

# Create a Null agent (sink) and attach to n2

set null0 [new Agent/Null]

$ns attach-agent $n2 $null0

# Connect the UDP agent to the Null agent

$ns connect $udp0 $null0

# Start the traffic

$ns at 0.5 “$cbr0 start”

  1. Set Up Mobility:
  • We can append the mobility to the nodes to mimic real-world scenarios in which the devices move in the Wi-Fi coverage area.

# Set up node mobility

$n0 setdest 30.0 50.0 10.0

$n1 setdest 40.0 60.0 15.0

$n2 setdest 50.0 70.0 20.0

  1. Run the Simulation:
  • Run the simulation and produce trace and NAM files for the investigation.

# Run the simulation

$ns at 30.0 “finish”

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam out.nam &

exit 0

}

$ns run

  1. Analyse Results:
  • We can use the trace file (out.tr) to evaluate packet delivery, latency, throughput, etc.
  • To visualize the simulation using NAM by opening the out.nam file.
  1. Customize and Extend:
  • We can change and extend the script by modifying performance metrics like packet size, routing protocol, node mobility, and more to mimic various Wi-Fi scenarios.

We detailed IEEE 802.11 Wi-Fi by following the provided process that helps to implement and analyse using the ns2 simulation. Additional insights will be given in line with your preferences. Get customized implementation of IEEE 802.11 Wi-Fi in ns2, ensuring that it meets your specific requirements. Our project guidance is best, designed to support you effectively.