Hi Sidney,
After times of trials, I've succeeded in letting different nodes own different
Tx Range by configuring different value of Pt_ for each node. I get different
values of Pt_ from a script:
# The transimssion radio range
Pt_ 6.9872e-4 ;# ?m
Pt_ 8.5872e-4 ;# 40m
Pt_ 1.33826e-3 ;# 50m
Pt_ 7.214e-3 ;# 100m
Pt_ 0.2818 ;# 250m
And in my script, I have test range of 250m and 40m. It really works well.
But It's a pity that I don't know how to obtain these values. The tool threshold
(~ns/lidep-utils/propagation/threshold.cc) only generate RXThresh_ other than
Pt_.
Is there somebody knowing how to get value of Pt_?
[Here is my test script]
# ======================================================================
# Define options
# ======================================================================
set val(ifqlen) 50 ;# max packet in ifq
set val(nn) 2 ;# number of mobilenodes
set val(rp) MFlood ;# routing protocol,DumbAgent
set val(chan) Channel/WirelessChannel
set val(prop) Propagation/TwoRayGround
set val(netif) Phy/WirelessPhy
set val(mac) Mac/802_11
set val(ifq) Queue/DropTail/PriQueue
set val(ll) LL
set val(ant) Antenna/OmniAntenna
set val(stop) 150
# Initialize the SharedMedia interface with parameters to make
# it work like the 914MHz Lucent WaveLAN DSSS radio interface
Phy/WirelessPhy set CPThresh_ 10.0
Phy/WirelessPhy set CSThresh_ 1.559e-11
Phy/WirelessPhy set RXThresh_ 3.652e-10
Phy/WirelessPhy set Rb_ 2*1e6
Phy/WirelessPhy set freq_ 914e+6
Phy/WirelessPhy set L_ 1.0
# Pt_
set txpower_(0) 0.2818 ;# 250m
set txpower_(1) 8.5872e-4 ;# 40m
set txpower_(2) 7.214e-3 ;# 100m
# ======================================================================
# Main Program
# ======================================================================
#ns-random 0
# Initialize Global Variables
set ns_ [new Simulator]
set tracefd [open mflood_txRange.tr w]
$ns_ trace-all $tracefd
set namtrace [open mflood_txRange.nam w]
$ns_ namtrace-all-wireless $namtrace 1000 500
# set up topography
set topo [new Topography]
$topo load_flatgrid 1000 500
# Create God
create-god $val(nn)
# Create the specified number of mobilenodes [$val(nn)] and "attach" them
# to the channel.
# configure node
set channel [new Channel/WirelessChannel]
$channel set errorProbability_ 0.0
$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 $channel \
-topoInstance $topo \
-agentTrace ON \
-routerTrace OFF\
-macTrace OFF \
-movementTrace OFF
for {set i 0} {$i < $val(nn) } {incr i} {
Phy/WirelessPhy set Pt_ $txpower_($i)
set node_($i) [$ns_ node]
$node_($i) random-motion 0;
}
# Provide initial (X,Y, for now Z=0) co-ordinates for mobilenodes
#
# N_0 <-- d ---> N_2
# src dst
$node_(0) set X_ 0.0
$node_(0) set Y_ 200.0
$node_(0) set Z_ 0.0
$node_(1) set X_ 1.0
$node_(1) set Y_ 200.0
$node_(1) set Z_ 0.0
$ns_ at 1.5 "$node_(1) setdest 255.0 200.0 2.0"
# Define node initial position in nam
for {set i 0} {$i < $val(nn)} {incr i} {
$ns_ initial_node_pos $node_($i) 20
}
set udp_(0) [new Agent/UDP]
set udp_(1) [new Agent/UDP]
$ns_ attach-agent $node_(0) $udp_(0)
$ns_ attach-agent $node_(1) $udp_(1)
set null_(0) [new Agent/Null]
set null_(1) [new Agent/Null]
$ns_ attach-agent $node_(1) $null_(0)
$ns_ attach-agent $node_(0) $null_(1)
$ns_ connect $udp_(0) $null_(0)
$ns_ connect $udp_(1) $null_(1)
for {set i 0} {$i < $val(nn)} {incr i} {
set cbr_($i) [new Application/Traffic/CBR]
$cbr_($i) set packetSize_ 512
$cbr_($i) set interval_ 2
$cbr_($i) set random_ 1
$cbr_($i) attach-agent $udp_($i)
}
$ns_ at 1.0 "$cbr_(0) start"
$ns_ at 1.1 "$cbr_(1) start"
# Tell nodes when the simulation ends
for {set i 0} {$i < $val(nn) } {incr i} {
$ns_ at $val(stop).0 "$node_($i) reset";
}
$ns_ at $val(stop).0 "stop"
$ns_ at $val(stop).01 "puts \"NS EXITING...\" ; $ns_ halt"
proc stop {} {
global ns_ tracefd namtrace
$ns_ flush-trace
close $tracefd
close $namtrace
}
puts "Starting Simulation..."
$ns_ run
Regards,
Phenix
From: Sidney Doria
Sent: Saturday, January 03, 2009 12:01 AM
To: Phenix
Subject: Re: [ns] how to set different transmit range for different node
Hi Phenix,
In the TCL file, there's a loop for node creation. So, you can break this node
in a manual creation, each node with specific characteristics.
Sidney Doria
UFCG / BRAZIL
2009/1/2 Phenix <[email protected]>
Hi all,
I'd like how to set different transmit range for different node in MANET.
eg.
Three nodes,N0,N1 and N2 are in a line:
(N0) (N1) (N2)
|--- 200m -----| ---120m---|
The transmit range of N0,N1 and N2 is respectively 250m,150m,200m.
So packets can be passed:
N0 --> N1 <---> N2
Let me know how to set different transmit range please.
Thank you in advance!
Regards,
Phenix
--
Sidney Doria
Redes ad hoc móveis
Doutorado em Computação
UFCG
Brasil
"Nessa jornada, o conhecimento será o seu escudo..."
(Mestre dos Magos no episódio do grimoire de ouro)
