I have to simulate a network with N 802.11 nodes associated with the same
Access Point where all nodes can hear each other. Every node has a CBR
source over UDP, except the node 1 with a CBR source over TCP, towards the
AP, while on the access point there are N sources CBR over UDP for each node
in the network.
I try to do my best, but it's my first script, and it doesn't work.
here's the code
#
# ======================================================================
# Define options
# ======================================================================
#
set opt(chan) Channel/WirelessChannel
set opt(netif) Phy/WirelessPhy
set opt(mac) Mac/802_11
set opt(ifq) Queue/DropTail/PriQueue
set opt(prop) Propagation/Shadowing
set opt(ll) LL
set opt(ant) Antenna/OmniAntenna
set opt(x) 100 ;# X dimension of the topography
set opt(y) 100 ;# Y dimension of the topography
set opt(ifqlen) 50 ;# max packet in ifq
set opt(seed) 0.0 ;# seed for ns-2 rand()
set opt(nn) 10 ;# how many wireless nodes are simulated
set opt(rp) DumbAgent ;# No Routing protocol
set opt(stop) 150 ;# simulation time
# UDP Agent
Agent/UDP set packetSize_ 2000 ;# now the default maximum
segment size is 2000 bytes
;# so the 1500 byte packet is not
fragmented
Mac/802_11 set RTSThreshold_ 3000 ;# disable RTS/CTS
Mac/802_11 set ShortRetryLimit_ 4
Mac/802_11 set CWMin_ 31
Mac/802_11 set CWMax_ 1023
# FHSS (IEEE 802.11)
Mac/802_11 set SlotTime_ 0.000020
Mac/802_11 set SIFS_ 0.000010
Mac/802_11 set PreambleLength_ 64
Mac/802_11 set PLCPHeaderLength_ 128
Mac/802_11 set PLCPDataRate_ 1.0e6
Mac/802_11 set dataRate_ 11.0e6
Mac/802_11 set basicRate_ 2.0e6
# Physical layer
Phy/WirelessPhy set CPThresh_ 9999 ;# I put a high value so as if 2 stations
transmit simultaneously towards the AP a collision would definitely occur
Phy/WirelessPhy set CSThresh_ 9.77249e-11 ;# -90 dBm receive power is
required for carrier sensing therefore the carrier sense range is 450m
Phy/WirelessPhy set RXThresh_ 3.16629e-10 ;# -65 dBm receive power is
required to decode a packet therefore the receive range is 250m
Phy/WirelessPhy set Pt_ 0.2818
Phy/WirelessPhy set freq_ 2.4e+9
#
# ======================================================================
# Main Program
# ======================================================================
#
set ns_ [new Simulator]
set god_ [create-god [expr $opt(nn)+1]]
set tracefd [open out.tr w]
$ns_ trace-all $tracefd
set tracenam [open out.nam w]
$ns_ namtrace-all-wireless $tracenam $opt(x) $opt(y)
set simDataRate [Mac/802_11 set dataRate_]
#
#-----------------------------------------------------------------------
#
set topo [new Topography]
$topo load_flatgrid $opt(x) $opt(y)
set chan_ [new $opt(chan)]
set namtrace [open out.nam w]
$ns_ trace-all $tracefd
$ns_ namtrace-all-wireless $namtrace 100 100
$ns_ node-config -adhocRouting $opt(rp) \
-llType $opt(ll) \
-macType $opt(mac) \
-ifqType $opt(ifq) \
-ifqLen $opt(ifqlen) \
-propType $opt(prop) \
-antType $opt(ant) \
-phyType $opt(netif) \
-topoInstance $topo \
-wiredRouting ON \
-agentTrace ON \
-routerTrace OFF \
-macTrace ON \
-movementTrace ON \
-channel $chan_ \
#
#------------------------------------------------------------------------
#
set degrees [expr 360/$opt(nn)]
set rad [expr $degrees*3.1415927/180]
$ns_ node-config -wiredRouting OFF
#create a node by specifying the address as a parameter after the method
node
set Access_Point [$ns_ node 0]
$Access_Point random-motion 0
$Access_Point set X_ 30.0
$Access_Point set Y_ 30.0
$Access_Point set Z_ 0.0
$ns_ at 0 "$Access_Point setdest 30. 30. 1000"
puts "Access Point coord. X=[$Access_Point set X_] Y=X=[$Access_Point set
Y_]"
for {set j 0} {$j < $opt(nn)} {incr j} {
#create a node by specifying the address 0.0.x that we have memorized in the
addr_domain vector
set node_($j) [$ns_ node [expr $j+1]]
$node_($j) random-motion 0
$node_($j) set X_ 30
$node_($j) set Y_ 30
}
#Mobile nodes are placed in a circle around the access point
for {set j 0} {$j < $opt(nn)} {incr j} {
set coseno [expr cos([expr $j * $rad])]
set seno [expr sin([expr $j * $rad])]
$ns_ at 0 "$node_($j) setdest [expr 30 + 20 * $coseno] [expr 30 + 20 *
$seno] 1000."
puts "placing node $j: X=[format %.2f [expr 30+20*$coseno]] Y=[format
%.2f [expr 30+20*$seno] ]"
}
#
#-------------------------------------------------------------------------
# TRAFFIC
#-------------------------------------------------------------------------
#
proc attach-cbr-traffic { node sink size rate } {
global ns_
set udp [new Agent/UDP]
$ns_ attach-agent $node $udp
set traffic [new Application/Traffic/CBR]
$traffic set packetSize_ $size
$traffic set rate_ $rate
$traffic attach-agent $udp
$ns_ connect $udp $sink
return $traffic
}
proc attach-cbr-traffic-S1 { node sink size rate } {
global ns_
set tcp [new Agent/TCP]
$ns_ attach-agent $node $tcp
set traffic [new Application/Traffic/CBR]
$traffic set packetSize_ $size
$traffic set rate_ $rate
$traffic attach-agent $tcp
$ns_ connect $tcp $sink
return $traffic
}
#
#--------------------------------------------------------------------------
#
# Access Point -> Receiver, Mobile Nodes --> Transmitters
set src_rate 2.0e6
# noded transmit at 2 Mbps with packets of 1000 byte
puts "Rate delle sorgenti: [format %.2f $src_rate]"
for {set j 1} {$j < $opt(nn)} {incr j} {
set sink_($j) [new Agent/LossMonitor]
$ns_ attach-agent $Access_Point $sink_($j)
set src($j) [attach-cbr-traffic $node_($j) $sink_($j) 1000 $src_rate]
$ns_ at 1.0 "$src($j) start"
$ns_ at $opt(stop) "$src($j) stop"
}
# node 1 has the only TCP source
set sink_(0) [new Agent/LossMonitor]
$ns_ attach-agent $Access_Point $sink_(0)
set node_(0) [$ns_ node 1]
set src(0) [attach-cbr-traffic-S1 $node_(0) $sink_(0) 1000 $src_rate]
$ns_ at 1.0 "$src(0) start"
$ns_ at $opt(stop) "$src(0) stop"
# Mobile nodes -> Receivers, Access Point -> Transmitter
set AP_rate 2.0e6
puts "Rate dell'Access Point: [format %.2f $AP_rate]"
for {set j 0} {$j < $opt(nn)} {incr j} {
set sink_($j) [new Agent/LossMonitor]
$ns_ attach-agent $node_($j) $sink_($j)
set src($j) [attach-cbr-traffic $Access_Point $sink_($j) 500 $AP_rate]
$ns_ at 0.5 "$src($j) start"
$ns_ at $opt(stop) "$src($j) stop"
}
#
#Tracing...
for {set j 0} {$j < $opt(nn)} {incr j} {
set trace_file_($j) [open bw_node_$j.tr w]
set bytes_file_($j) [open bytes_rx_$j.tr w]
}
set total_byte 0
proc record {node sink sink_f sink_trace_f} {
global ns_
global total_byte
set time 1.
set bw_($node) [$sink set bytes_]
set now [$ns_ now]
puts $sink_trace_f "[format %.2f $now ] [expr
double($bw_($node)*8.)/$time/1000] Kbps"
incr total_byte $bw_($node)
$sink set bytes_ 0
$ns_ at [expr $now+$time] "record {$node} {$sink} {$sink_f}
{$sink_trace_f}"
}
#
#Finishing...
proc finish {trace_file bytes_file} {
global ns_ tracefd total_byte opt
$ns_ flush-trace
close $trace_file
close $bytes_file
close $tracefd
puts "Total throughput [format %.2f [expr
$total_byte*8./($opt(stop)-1)/1000000.]] Mbps"
exit 0
}
for {set j 0} {$j < $opt(nn)} {incr j} {
$ns_ at 0.100 "record {$j} {$sink_($j)} {$bytes_file_($j)}
{$trace_file_($j)}"
$ns_ at $opt(stop) " finish {$trace_file_($j)} {$bytes_file_($j)}"
}
#
#------------------------------------------------------------------------------
# Tell nodes when the simulation ends
#------------------------------------------------------------------------------
#
for {set i 0} {$i < $opt(nn) } {incr i} {
$ns_ at $opt(stop).001 "$node_($i) reset";
}
$ns_ at $opt(stop).0002 "puts \"NS EXITING!\" ; $ns_ halt"
$ns_ run
Please help me
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