sim.tcl

The goal of this simple exercise is to look closely at some RF propagation models, and their impleme

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#      Engineering Group at Lawrence Berkeley Laboratory.
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# Script to Study ns2 Propagation Models
# V.B., March 2005  

# ======================================================================
# Define options
# ======================================================================
set val(chan)           Channel/WirelessChannel    ;# channel type
set val(prop)           Propagation/Shadowing   ;# 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)             AODV                       ;# routing protocol
set val(sc)		"./scenario"		   ;# scenario file
set val(x)		3000.0			   ;
set val(y)		400.0			   ;
set val(simtime)	10.0			   ; #sim time
set val(drate)		2.0e6			   ; #default datarate
set val(dist)		100			   ;
# ======================================================================
# Main Program
# ======================================================================

if { $argc != 2} {
        puts "Wrong no. of cmdline args."
        puts "Usage: ns sim.tcl -dist <x>"
        exit 0
}


proc getopt {argc argv} {
        global val
        lappend optlist dist 
 
        for {set i 0} {$i < $argc} {incr i} {
                set arg [lindex $argv $i]
                if {[string range $arg 0 0] != "-"} continue
 
                set name [string range $arg 1 end]
                set val($name) [lindex $argv [expr $i+1]]
        }

}



getopt $argc $argv

#
# Initialize Global Variables
#
set ns_		[new Simulator]
set tracefd     [open sim.tr w]
$ns_ trace-all $tracefd

$ns_ use-newtrace

# set up topography object
set topo       [new Topography]

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

#
# Create God
#

set god_ [ create-god $val(nn) ]

$val(netif) set Pt_ 0.100
$val(netif) set RXThresh_ 7.94328e-13
$val(netif) set CSThresh_ 6.30957e-14



$val(mac) set dataRate_ $val(drate)


#Shadowing Model Parameters
$val(prop) set std_db_ 4.0
$val(prop) set pathlossExp_ 3.5 


#
#  Create the specified number of mobilenodes [$val(nn)] and "attach" them
#  to the channel. 

# configure node


        $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 OFF



	for {set i 0} {$i < $val(nn) } {incr i} {
		set node_($i) [$ns_ node]	
		$node_($i) random-motion 0		;# disable random motion
	}




#
# Provide initial (X,Y, Z=0) co-ordinates for mobilenodes
#

#Node 0 is the source, Node 1 is the dst

	$node_(0) set X_ 100.0
	$node_(0) set Y_ 200.0
	$node_(0) set Z_ 0.0
	

	$node_(1) set X_ [expr 100.0 + $val(dist)]
	$node_(1) set Y_ 200.0
	$node_(1) set Z_ 0.0



# Define node initial position in nam

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

    # 20 defines the node size in nam, must adjust it according to your scenario
    # The function must be called after mobility model is defined
    
    $ns_ initial_node_pos $node_($i) 20
}



#Attach a data-sink to destination

	set null_(0) [new Agent/Null]
	$ns_ attach-agent $node_(1) $null_(0)


		
	
	
#traffic...make src talk to dst
		set udp_(0) [new Agent/UDP]
		$ns_ attach-agent $node_(0) $udp_(0)
				
		set cbr_(0) [new Application/Traffic/CBR]
		$cbr_(0) set packetSize_ 512 
		$udp_(0) set packetSize_ 512 
		$cbr_(0) set interval_ 0.0008 
		$cbr_(0) set random_ 0.96749 
		$cbr_(0) set maxpkts_ 1000000
		$cbr_(0) attach-agent $udp_(0)
		$ns_ connect $udp_(0) $null_(0)
		$ns_ at 0.0 "$cbr_(0) start"



	
#
# Tell nodes when the simulation ends
#
for {set i 0} {$i < $val(nn) } {incr i} {
    $ns_ at $val(simtime) "$node_($i) reset";
}
$ns_ at $val(simtime) "stop"
$ns_ at $val(simtime).01 "puts \"NS EXITING...\" ; $ns_ halt"
proc stop {} {
    global ns_ tracefd
    $ns_ flush-trace
    close $tracefd
}

puts "Starting Simulation..."
$ns_ run