Examples for CBR traffic
transmission over EDCF-based wireless networks
# globals and flags
set ns [new Simulator]
#number of nodes
set num_wired_nodes 1
set num_mobile_nodes 1
set num_bs_nodes 1 ;# number of base
stations
set num_nodes [expr
$num_wired_nodes + $num_mobile_nodes + $num_bs_nodes]
set bs_id $num_wired_nodes
# Parameter for wireless nodes
set opt(chan)
Channel/WirelessChannel ;# channel type
set opt(prop)
Propagation/TwoRayGround ;# radio-propagation model
set opt(netif)
Phy/WirelessPhy
;# network interface type
set opt(mac)
Mac/802_11e
;# MAC type
set opt(ifq)
Queue/DTail/PriQ ;# interface queue type
set opt(ifqlen)
50
set opt(ll)
LL
;# link layer type
set opt(ant)
Antenna/OmniAntenna ;#
antenna model
set opt(ifqlen)
50
;# max packet in ifq
set opt(adhocRouting) NOAH
;# routing protocol
set opt(x) 670 ;# X dimension of the topography
set opt(y) 670 ;#
Y dimension of the topography
#smallko add the following two lines
Mac/802_11e set dataRate_ 1Mb
Mac/802_11e set basicRate_ 1Mb
Mac/802_11e set backoff_mode_ 1
#set up for hierarchical routing
#(needed for routing over a basestation)
$ns node-config -addressType
hierarchical
AddrParams set domain_num_ 2
;# domain number
lappend cluster_num 1 1
;# cluster number for each domain
AddrParams set cluster_num_ $cluster_num
lappend eilastlevel $num_wired_nodes [expr $num_mobile_nodes + $num_bs_nodes] ;# number of nodes for each cluster
AddrParams set nodes_num_ $eilastlevel
#Open the nam trace file
set nf [open out.nam
w]
$ns namtrace-all-wireless $nf $opt(x) $opt(y)
set ntr [open out.tr
w]
$ns trace-all $ntr
set chan [new
$opt(chan)]
set topo [new
Topography]
$topo load_flatgrid
$opt(x) $opt(y)
# Create God
create-god [expr $num_mobile_nodes
+ $num_bs_nodes]
# creating wired nodes
for {set i 0} {$i
< $num_wired_nodes} {incr
i} {
set
W($i) [$ns node 0.0.$i]
puts
"wired node $i created"
}
# creating base station
$ns node-config -adhocRouting
$opt(adhocRouting) \
-llType $opt(ll) \
-macType $opt(mac)
\
-ifqType $opt(ifq)
\
-ifqLen $opt(ifqlen)
\
-antType $opt(ant) \
-propType $opt(prop) \
-phyType $opt(netif)
\
-channel
$chan \
-topoInstance $topo
\
-wiredRouting ON \
-agentTrace OFF \
-routerTrace OFF \
-macTrace OFF \
-movementTrace OFF
set BS(0) [$ns node 1.0.0]
$BS(0) random-motion 0
puts "Base-Station node $bs_id
created"
#provide some co-ord (fixed) to base
station node
$BS(0) set X_ 1.0
$BS(0) set Y_ 2.0
$BS(0) set Z_ 0.0
# creating mobile nodes
$ns node-config -wiredRouting
OFF
for {set i 0} {$i
< $num_mobile_nodes} {incr
i} {
set wl_node_($i)
[$ns node 1.0.[expr $i +
1]]
$wl_node_($i) random-motion 0 ;#
disable random motion
puts
"wireless node $i created ..."
$wl_node_($i) base-station [AddrParams addr2id [$BS(0) node-addr]]
$wl_node_($i) set X_ [expr $i * 10]
$wl_node_($i) set Y_ [expr $i * 10]
$wl_node_($i) set Z_ 0.0
}
# linking of root to base-station node
$ns duplex-link $W(0) $BS(0) 10Mb 2ms DropTail
# linking of wired nodes to root node
#for {set i 1} {$i
< $num_wired_nodes} {incr
i} {
# $ns
duplex-link $W($i) $W(0) 10Mb 2ms DropTail
#}
set src_udp0 [new Agent/UDP]
$src_udp0 set class_ 0
# highest priority
$src_udp0 set prio_ 0
set dst_udp0 [new Agent/Null]
$ns attach-agent $wl_node_(0) $src_udp0
$ns attach-agent $W(0) $dst_udp0
set app0 [new Application/Traffic/CBR]
$app0 attach-agent $src_udp0
$ns connect $src_udp0 $dst_udp0
$ns at 0.0 "$app0 start"
set src_udp1 [new Agent/UDP]
$src_udp1 set class_ 1
$src_udp1 set prio_ 1
set dst_udp1 [new Agent/Null]
$ns attach-agent $wl_node_(0) $src_udp1
$ns attach-agent $W(0) $dst_udp1
set app1 [new Application/Traffic/CBR]
$app1 attach-agent $src_udp1
$ns connect $src_udp1 $dst_udp1
$ns at 0.3 "$app1 start"
set src_udp2 [new Agent/UDP]
$src_udp2 set class_ 2
$src_udp2 set prio_ 2
set dst_udp2 [new Agent/Null]
$ns attach-agent $wl_node_(0) $src_udp2
$ns attach-agent $W(0) $dst_udp2
set app2 [new Application/Traffic/CBR]
$app2 attach-agent $src_udp2
$ns connect $src_udp2 $dst_udp2
$ns at 0.1 "$app2 start"
set src_udp3 [new Agent/UDP]
#lowest priority
$src_udp3 set class_ 3
$src_udp3 set prio_ 3
set dst_udp3 [new Agent/Null]
$ns attach-agent $wl_node_(0) $src_udp3
$ns attach-agent $W(0) $dst_udp3
set app3 [new Application/Traffic/CBR]
$app3 attach-agent $src_udp3
$ns connect $src_udp3 $dst_udp3
$ns at 0.2 "$app3 start"
# Define node initial position in nam
for {set i 0} {$i
< $num_mobile_nodes} {incr
i} {
$ns initial_node_pos $wl_node_($i) 20
}
# Tell nodes when the simulation ends
for {set i 0} {$i
< $num_mobile_nodes } {incr
i} {
$ns at
10.0 "$wl_node_($i)
reset";
}
$ns at 100.0 "$BS(0) reset";
$ns at 100.0 "$app0 stop"
$ns at 100.0 "$app1 stop"
$ns at 100.0 "$app2 stop"
$ns at 100.0 "$app3 stop"
$ns at 110.0 "puts \"NS EXITING...\" ; $ns
halt"
proc stop {} {
global ns
ntr nf
close $ntr
close $nf
}
# run the simulation
$ns run
