Dear all,
Does anyone have successful experience in using MAC/Simple for wireless ad
hoc simulation? I wrote the following script to run simulation. When I set
the MAC type as MAC/802_11, the simulation ran just fine. But when I set the
MAC type as MAC/Simple, segmentation fault was reported. And if I change the
number of source nodes to one, the simulation can also success even using
MAC/Simple. Does anyone try MAC/Simple before? Can anyone tell me if there
is something wrong with my script or there is bug in NS2? I am using
NS2.29. Thank you in advance!!
Kai Bai
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/Simple ;# 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) 51 ;# number of mobilenodes
set val(rp) DSR ;# routing protocol
set val(x) 400
set val(y) 420
puts "This is a sensor network simulation by kai."
# Initialize Global Variables
set ns_ [new Simulator]
set tracefd [open relib.tr w]
$ns_ use-newtrace
$ns_ trace-all $tracefd
set namtrace [open relib.nam w]
$ns_ namtrace-all-wireless $namtrace $val(x) $val(y)
# set up topography object
set topo [new Topography]
$topo load_flatgrid $val(x) $val(y)
# Create God
create-god $val(nn)
# New API to config node:
# 1. Create channel (or multiple-channels);
# 2. Specify channel in node-config (instead of channelType);
# 3. Create nodes for simulations.
# Create channel #1 and #2
set chan_1_ [new $val(chan)]
set chan_2_ [new $val(chan)]
# Create node(0) "attached" to channel #1
# configure node, please note the change below.
$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) \
-topoInstance $topo \
-agentTrace OFF \
-routerTrace OFF \
-macTrace ON \
-movementTrace OFF \
-channel $chan_1_
set cols [expr floor(sqrt($val(nn)-1))]
set rows [expr ceil(($val(nn)-1)/$cols)]
set colinterval [expr floor($val(x)/($cols-1)) - 1]
set rowinterval [expr floor(($val(y)-20)/($rows-1)) - 1]
# 8.5872e-4,For 40m transmission range.
# 7.214e-3 for 100m transmission range
Phy/WirelessPhy set Pt_ 7.214e-3
for {set i 0} {$i < $val(nn) } {incr i} {
set node_($i) [$ns_ node]
$node_($i) random-motion 0
}
for {set i 0} {$i < $val(nn) } {incr i} {
$ns_ initial_node_pos $node_($i) 20
}
#
# Provide initial (X,Y, for now Z=0) co-ordinates for mobilenodes
#
#calculate node position
set colnum 1
set rownum 1
set cols [expr int($cols)]
set rows [expr int($rows)]
for {set i 0} {$i < [expr $val(nn)-1]} {incr i} {
if {$colnum > $cols} {
set colnum 1
set rownum [expr $rownum+1]
}
if {$colnum == 1} {
set xpos($i) 1
} else {
set xpos($i) [expr $xpos([expr $i - 1]) + $colinterval]
}
if {$rownum == 1} {
set ypos($i) 1
} else {
set ypos($i) [expr $ypos([expr $i - $cols]) + $rowinterval]
}
set colnum [expr $colnum+1]
}
for {set i 0} {$i < [expr $val(nn)-1]} {incr i} {
$node_($i) set X_ $xpos($i)
$node_($i) set Y_ $ypos($i)
}
#setup the sink position
$node_([expr $val(nn)-1]) set X_ [expr $val(x)/2]
$node_([expr $val(nn)-1]) set Y_ [expr $val(y)-10]
$node_([expr $val(nn)-1]) set Z_ 0.0
$ns_ at 0.01 "$node_([expr $val(nn)-1]) setdest [expr $val(x)/2] [expr
$val(y)-10] 15.0"
# assume stationary networks
for {set i 0} {$i < [expr $val(nn)-1]} {incr i} {
$ns_ at 0.01 "$node_($i) setdest $xpos($i) $ypos($i) 15.0"
}
# Setup traffic flow between nodes
# TCP connections between node_(0) and node_(1)
set sink_0 [new Agent/Null]
$ns_ attach-agent $node_([expr $val(nn)-1]) $sink_0
for {set i 0} {$i < [expr $val(nn)-1]} {incr i} {
set src0_($i) [new Agent/UDP]
$ns_ attach-agent $node_($i) $src0_($i)
$ns_ connect $src0_($i) $sink_0
}
set cbr_0 [new Application/Traffic/CBR]
$cbr_0 set packetSize_ 30
$cbr_0 set interval_ 1.0
$cbr_0 attach-agent $src0_(2)
set cbr_2 [new Application/Traffic/CBR]
$cbr_2 set packetSize_ 30
$cbr_2 set interval_ 1.0
$cbr_2 attach-agent $src0_(4)
$ns_ at 0.5 "$cbr_0 start"
$ns_ at 2.5 "$cbr_2 start"
#
# Tell nodes when the simulation ends
#
for {set i 0} {$i < $val(nn) } {incr i} {
$ns_ at 100.0 "$node_($i) reset";
}
$ns_ at 100.0 "stop"
$ns_ at 100.01 "puts \"NS EXITING...\" ; $ns_ halt"
proc stop {} {
global ns_ tracefd
$ns_ flush-trace
close $tracefd
}
puts "Starting Simulation..."
$ns_ run
