Ok, thanks for your help.
I will try to do all your advices. Regards, Víctor. El mar, 24-10-2006 a las 15:33 +0200, Miguel Sepulcre Ribes escribió: > Hi, > > Have you tried to plot the received power of node1 against the > distance to > node0? I think that an exponent equal to 2.5 for the log-distance > pathloss > model could allow the signal to reach long distances. If despite of > the > Ricean fading your average received power is always very high, you > will > receive all packets correctly, since you are using a quite high value > of K. Try also to compare the simulation with the theoretical > propagation model equations . > > Regards > > Miguel > > > Víctor González <[EMAIL PROTECTED]> escribió: > > > Hi all, > > we are simulating a wireless scenario with NS2.29 in an Ubuntu > 6.06LTS > (i686 arch). Our scenario consists in two mobile nodes moving > at high > speeds in a highway scenario. Each node moves towards the > other and we > achieve relative speeds up to 300Kmph (186mph) and uses a > 802.11b > wireless interface. One of them sends CBR packets at 11Mbps to > the > other. > > We are using the Ricean Propagation Model Extension (made by > Ratish J. > Punnoose) in order to have a more realistic propagation model > than > TwoRayground or Shadowing. > > When we analyzed the trace file we haven't any errors (in MAC > level). > All the packets sent bye node 0 were received by node 1. We > expected to > have some losses in our system, so after seeing this we have > installed > an error model (Ralistic Channel Propagation, made by Wu > Xiuchao), which > introduces errors due BER. Despite adding that error model we > still > haven't lost packets in our tracefile. We also tried to > simulate without > the extensions we mentioned previously with the same result. > > We think this is a very strange situation, may be, produced by > some > mistake in our NS2 script. You can see it below. > > Thanks to all and kind regards, > > Víctor González Pacheco > > > # =========================================== > # Arguments passed to the Simulation Script > # =========================================== > set HI [lindex $argv 0] > set SPEED [lindex $argv 1] > set TRACE_NAME [lindex $argv 2] > set NAMTRACE_NAME [lindex $argv 3] > set STOP [lindex $argv 4] > set SPEED [expr $SPEED/3.6] ;# Changing speed from Km/h to > m/s > set RATE [lindex $argv 5] > set SIZE [lindex $argv 6] > # ============================================ > > set ns_ [new Simulator] > > # ====================== > # Import Node Options > # ====================== > # Options for NS2 simulations in COM2REACT project. > # For more information please contact with [EMAIL PROTECTED] > # ============================================== > # first set values of shadowing model > # ============================================== > Propagation/Shadowing set pathlossExp_ 2.5 ;# path loss > exponent > Propagation/Shadowing set std_db_ 4.0 ;# shadowing > deviation (dB) > Propagation/Shadowing set dist0_ 1.0 ;# reference > distance (m) > Propagation/Shadowing set seed_ raw ;# seed for RNG > # ============================================== > > > # =============================================== > # Define Options > # =============================================== > set opt(chan) Channel/WirelessChannel ;# channel type > #set opt(prop) Propagation/TwoRayGround ;# > radio-propagation model > #set opt(prop) Propagation/Shadowing ;# > radio-propagation model > set opt(prop) Propagation/Ricean ;# > radio-propagation model > set opt(netif) Phy/WirelessPhy ;# network > interface type > set opt(mac) Mac/802_11 ;# MAC type > set opt(ifq) Queue/DropTail/PriQueue ;# interface > queue type > set opt(ll) LL ;# link layer > type > set opt(ant) Antenna/OmniAntenna ;# antenna > model > set opt(ifqlen) 100 ;# max packet > in ifq > set opt(nn) 2 ;# number of > mobilenodes > set opt(adhocRouting) OLSR ;# routing > protocol > > set opt(cp) "traffic_pattern.tcl" ;# connection > pattern file > set opt(sc) "node_movements.tcl" ;# node > movement file. > > set opt(x) 4000.0 ;# x coordinate > of topology > set opt(y) 100.0 ;# y coordinate > of topology > set opt(seed) 0.0 ;# seed for > random number gen. > set opt(stop) $STOP ;# time to stop > simulation > > set opt(v0) $SPEED ;# Node v0 > speed in m/s > set opt(v1) 0.0 ;# Node v1 > speed in m/s > # ================================================ > > > > # ================================================ > # Energy options > # ================================================ > #set opt(engmodel) EnergyModel > #set opt(txPower) 1.4 ;# transmitting > power in mW 1.4 > #set opt(rxPower) 0.9 ;# recving > power in mW > #set opt(sensePower) 0.00000175 ;# sensing power > in mW > #set opt(idlePower) 0.0 ;# idle power > in mW > #set opt(initeng) 75 ;# Initial > energy in Joules > # ================================================= > > > > # ====================== > # Turn off RTS/CTS > # ====================== > > Mac/802_11 set RTSThreshold_ 3000 > # ====================== > > > > # =================================================== > # Initialize the SharedMedia interface with parameters to make > # it work like the 5004 MP Atheros 4G miniPCI card > # =================================================== > > Phy/WirelessPhy set CPThresh_ 10.0 ;# > Collision Threshold > > Phy/WirelessPhy set CSThresh_ 2.0e-14 ;# > (-107dBm) > Phy/WirelessPhy set RXThresh_ 1.77827941e-13 ;#-97.5 dBm > > > Phy/WirelessPhy set Pt_ 0.4 ;# > 0.031622777 Transmition Power (watts) > > Phy/WirelessPhy set freq_ 2.472e9 ;# Frequency of > work > Phy/WirelessPhy set L_ 1 ;# System > Loss Factor > # =================================================== > > > # ========================= > # control OLSR behaviour from this script - > # ========================= > > Agent/OLSR set use_mac_ true > Agent/OLSR set debug_ true > #Agent/OLSR set willingness 3 > Agent/OLSR set hello_ival_ $HI > #Agent/OLSR set tc_ival_ 5 > # ============================================ > > > > #=============================================== > # UPDATE OPTIONS > #================================================ > > ErrorModel80211 noise1 > -107 ;# 1Mbps datarate thermal > noise > ErrorModel80211 noise2 > -106 ;# 2Mbps datarate thermal > noise > ErrorModel80211 noise55 -105 ;# > 5.5Mbps datarate thermal noise > ErrorModel80211 noise11 -102 ;# > 11Mbps datarate thermal noise > ErrorModel80211 shortpreamble 0 ;# > toggle 802.11 short preamble on/off > ErrorModel80211 LoadBerSnrFile ber_snr_intersil.txt ;# use > Intersil BER/SNR empirical curves > #ErrorModel80211 LoadBerSnrFile ber_snr_choi.txt ;# use > theoretical curves from del Prado > ;# Pavon > and Choi, "Link Adaptation Strategy > ;# for > IEEE 802.11 WLAN via Received Signal > ;# > Strength Measurement" > Mac/802_11 set CWMin_ 31 > Mac/802_11 set CWMax_ 1023 > Mac/802_11 set SlotTime_ 0.000020 ;# 20us > Mac/802_11 set SIFS_ esto 0.000010 ;# 10us > Mac/802_11 set PreambleLength_ 144 ;# 144 bit > Mac/802_11 set ShortPreambleLength_ 72 ;# 72 bit > Mac/802_11 set PreambleDataRate_ 1.0e6 ;# 1Mbps > Mac/802_11 set PLCPHeaderLength_ 48 ;# 48 bits > Mac/802_11 set PLCPDataRate_ 1.0e6 ;# 1Mbps > Mac/802_11 set ShortPLCPDataRate_ 2.0e6 ;# 2Mbps > Mac/802_11 set RTSThreshold_ 3000 ;# bytes > Mac/802_11 set ShortRetryLimit_ 7 ;# > retransmissions > Mac/802_11 set LongRetryLimit_ 4 ;# > retransmissions > > Mac/802_11 set newchipset_ false ;# use new > chipset, allowing a more recent > ;# packet to be correctly received in place > ;# of the first sensed packet > Mac/802_11 set dataRate_ 11Mb ;# 802.11 data > transmission rateMac/802_11 set basicRate_ > 1Mb ;# 802.11 basic transmission rate > Mac/802_11 set aarf_ true ;# 802.11 > Auto Rate Fallback > # =================================================== > > > > # ======================== > # only for Ricean propagation > # ======================== > > set prop_inst [$ns_ set propInstance_] > $prop_inst MaxVelocity 80.0; > $prop_inst RiceanK 6; > $prop_inst LoadRiceFile "rice_table.txt"; > # ======================== > > > > > > ______________________________________________________________________ > > LLama Gratis a cualquier PC del Mundo. > Llamadas a fijos y móviles desde 1 céntimo por minuto. > http://es.voice.yahoo.com
