CN 4- SIMPLE ESS IN WIRE-LESS LAN

4. Implement simple ESS and with transmitting nodes in wire-less LAN by simulation and determine the performance with respect to transmission of packets.

cn4.tcl - PROGRAM

# Simulation parameters setup

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

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

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

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

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

set val(ll) LL ;# link layer type

set val(ant) Antenna/OmniAntenna ;# antenna model

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

set val(nn) 2 ;# number of mobilenodes

set val(rp) DSDV ;# routing protocol

set val(x) 700 ;# X dimension of topography

set val(y) 444 ;# Y dimension of topography

set val(stop) 10.0 ;# time of simulation end

# Initialization

#Create a ns simulator

set ns [new Simulator]

#Setup topography object

set topo [new Topography]

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

create-god $val(nn)

#Open the NS trace file

set tracefile [open out.tr w]

$ns trace-all $tracefile

#Open the NAM trace file

set namfile [open out.nam w]

$ns namtrace-all $namfile

$ns namtrace-all-wireless $namfile $val(x) $val(y)

set chan [new $val(chan)];#Create wireless channel

# Mobile node parameter setup

$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) \

-channel $chan \

-topoInstance $topo \

-agentTrace ON \

-routerTrace ON \

-macTrace ON \

-movementTrace ON

# Nodes Definition

#Create 2 nodes

set n0 [$ns node]

$n0 set X_ 268

$n0 set Y_ 339

$n0 set Z_ 0.0

$ns initial_node_pos $n0 20

set n1 [$ns node]

$n1 set X_ 428

$n1 set Y_ 344

$n1 set Z_ 0.0

$ns initial_node_pos $n1 20

# Generate movement

$ns at .1 " $n0 setdest 600 344 100 "

$ns at .1 " $n1 setdest 300 339 100 "

# Agents Definition

#Setup a TCP connection

set tcp0 [new Agent/TCP]

$ns attach-agent $n0 $tcp0

set sink1 [new Agent/TCPSink]

$ns attach-agent $n1 $sink1

$ns connect $tcp0 $sink1

$tcp0 set packetSize_ 1500

# Applications Definition

#Setup a FTP Application over TCP connection

set ftp0 [new Application/FTP]

$ftp0 attach-agent $tcp0

$ns at 1.0 "$ftp0 start"

$ns at 5.0 "$ftp0 stop"

#Define a 'finish' procedure

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam out.nam &

exit 0

}

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

$ns at $val(stop) "\$n$i reset"

}

$ns at $val(stop) "$ns nam-end-wireless $val(stop)"

$ns at $val(stop) "finish"

$ns at $val(stop) "puts \"done\" ; $ns halt"

$ns run

cn4.awk - PROGRAM

BEGIN{

count=0;

total=0;

}

{

event =$1;

if(event=="D") {

count++;

}

}

END{

printf("No of packets dropped : %d\n",count);

}

STEPS :

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OUTPUT :

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