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 <phenix...@hhu.edu.cn> 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)