How to Implement AOMDV Protocol in NS2

 

To implement the AOMDV (Ad hoc On-Demand Multipath Distance Vector) protocol within NS2 has needs to include configuring the network simulation environment to use this multipath routing protocol. This protocol is an enlargement of the AODV (Ad hoc On-Demand Distance Vector) protocol that giving several loop-free and link-disjoint paths among the source and destination. It supports in enhancing the reliability and load balancing within mobile ad hoc networks (MANETs).

Step-by-Step Implementation:

Step 1: Install NS2 and Verify Installation

Make sure NS2 is installed on the system. We can download it from the NS2 webpage and pursue the installation instructions. Check the installation by running a simple simulation.

Step 2: Implement or Obtain AOMDV

AOMDV is not natively obtainable in standard NS2 installations. But, we can:

  1. Download an existing AOMDV patch: Search for accessible AOMDV executions or patches that we can apply to NS2.
  2. Manually Implement AOMDV: It includes writing the C++ code that expands the AODV execution in NS2 to assist multipath routing.

Step 3: Applying an AOMDV Patch

If we discovery an AOMDV patch, follow the below steps:

  1. Download the Patch: Discover the suitable AOMDV patch compatible with the NS2 version.
  2. Apply the Patch:

patch -p1 < aomdv.patch

  1. Recompile NS2:

make clean

make

Step 4: Create a Simulation Script for AOMDV

When AOMDV is executed or patched into NS2, we can make a Tcl script to replicate the network using AOMDV.

Example Tcl Script:

# Create a simulator object

set ns [new Simulator]

# Define the topology

set val(chan)   Channel/WirelessChannel

set val(prop)   Propagation/TwoRayGround

set val(netif)  Phy/WirelessPhy

set val(mac)    Mac/802_11

set val(ifq)    Queue/DropTail/PriQueue

set val(ll)     LL

set val(ant)    Antenna/OmniAntenna

set val(ifqlen) 50

set val(nn)     10

set val(x)      1000

set val(y)      1000

set val(stop)   50.0

set val(rp)     AOMDV   ;# Routing protocol

# Initialize the topology object

set topo [new Topography]

$topo load_flatgrid $val(x) $val(y)

# Create the God object

create-god $val(nn)

# Configure the nodes

$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 ON \

-movementTrace ON

# Create nodes

for {set i 0} {$i < $val(nn)} {incr i} {

set node_($i) [$ns node]

}

# Define node positions and movement model

$node_(0) set X_ 100.0; $node_(0) set Y_ 200.0

$node_(1) set X_ 200.0; $node_(1) set Y_ 300.0

$node_(2) set X_ 300.0; $node_(2) set Y_ 400.0

$node_(3) set X_ 400.0; $node_(3) set Y_ 500.0

$node_(4) set X_ 500.0; $node_(4) set Y_ 600.0

# Set up traffic sources

set udp [new Agent/UDP]

$ns attach-agent $node_(0) $udp

set null [new Agent/Null]

$ns attach-agent $node_(4) $null

$ns connect $udp $null

set cbr [new Application/Traffic/CBR]

$cbr attach-agent $udp

$cbr set packetSize_ 512

$cbr set interval_ 0.1

$cbr start

# Simulation end

$ns at $val(stop) “stop”

$ns at $val(stop) “$ns nam-end-wireless $val(stop)”

$ns at $val(stop) “exit 0”

proc stop {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

}

# Run the simulation

$ns run

Step 5: Run the Simulation

  1. We can save the Tcl script like aomdv_example.tcl.
  2. Open a terminal and navigate to the directory in which we saved the Tcl script.
  3. Run the simulation using the below command:

ns aomdv_example.tcl

Step 6: Analyse the Results

  • We can use trace files and the network animator (NAM) to estimate the performance of the AOMDV protocol, concentrating on the parameters like packet delivery ratio, end-to-end delay, and routing overhead.
  • Look at how effectively AOMDV manages route failures and maintains several paths.

Additional Considerations

  • Testing in Various Scenarios: Examine AOMDV under various mobility models, node densities, and traffic patterns to estimate its performance.
  • Performance Comparison: Compare AOMDV’s performance with single-path protocols such as AODV to know the benefits of multipath routing.

In this procedure, completely know how to install ns2 and implement the AOMDV protocol in the simulation ns2. For more necessities, we will guide you over another simulation process. Get customized assistance from our team for the implementation of the AOMDV Protocol in NS2. We will provide guidance at every stage of the process. Explore top project topics available at ns2project.com. Our services also include performance analysis for your project.