I want to simulate a wired-cum wireless scenario adding FEC, ARQ functionality to the wireless environment. Please help me in any of these topics :
1. I added uniform error model to my mobile nodes configuration, I can not get any dropped packets. I am using *cat mixed.tr<http://pastebin.com/f1cf95ae0>| grep d * to search for dropped packets in the trace file. I can not get any dropped packets 2. I tried to attach flow monitor to tcp flow because I want to measure the dropped packets, but it seems that attach-fmon wants a link which is not available in the wireless based flows, how can I use that flow monitor for wireless flows??? The flow monitor section is commented to make the script working. The attach-fmon is not working :( 3. I want to add sequential decoding algorithm [FEC algorithm] to the link layer, I want also to implement ARQ in the Link layer [MAC 802.11]. I am not sure what is possible to do and what is not ? Any idea how can I start ? and where to find resources ? *Please reply, Your reply will help me a lot.* My current code. ### This simulation is an example of combination of wired and wireless ### topologies. #------------------------------------------------------------------------------- #defining a new hashtable to store values global opt set adhocRouting DSDV set stop 350 set num_wired_nodes 1 set num_bs_nodes 1 set num_wireless_nodes 2 set x 300 set y 300 #------------------------------------------------------------------------------- proc plotWindow { tcpSource file } { global ns_ set time 0.1 set now [$ns_ now] set cwnd [$tcpSource set cwnd_] set wnd [$tcpSource set window_] puts $file "$now $cwnd" $ns_ at [expr $now+$time] "plotWindow $tcpSource $file" } proc wireless_node_config { ns topo em } { $ns node-config -adhocRouting DSDV \ -llType LL \ -macType Mac/802_11 \ -ifqType Queue/DropTail/PriQueue \ -ifqLen 50 \ -antType Antenna/OmniAntenna \ -propInstance [new Propagation/TwoRayGround] \ -phyType Phy/WirelessPhy \ -channel [new Channel/WirelessChannel] \ -topoInstance $topo \ -wiredRouting ON \ -agentTrace ON \ -routerTrace OFF \ -macTrace OFF \ -outgoingErrProc $em \ -incomingErrProc $em } proc nam {ns namFile trFile namOutFile} { $ns flush-trace close $namFile close $trFile puts "running nam..." # exec nam $namOutFile & puts "I am in nam" } proc finish { } { exit 0 } #------------------------------------------------------------------------------- # The global simulator instance set ns_ [new Simulator] #------------------------------------------------------------------------------- #Hierarchical routing is needed to in mixed environments #each of wireless and wired environment must be in seperated domains #so at least we want 2 domains # set up for hierarchical routing $ns_ node-config -addressType hierarchical AddrParams set domain_num_ 2 lappend cluster_num 1 2 AddrParams set cluster_num_ $cluster_num lappend eilastlevel 1 1 2 AddrParams set nodes_num_ $eilastlevel #------------------------------------------------------------------------------- #set the Topology set topo [new Topography] $topo load_flatgrid x y # god needs to know the number of all wireless interfaces create-god [expr $num_wireless_nodes+$num_wired_nodes] #------------------------------------------------------------------------------- #trace output file set trFile [open mixed.tr w] $ns_ trace-all $trFile # nam output files set namFile [open mixed.nam w] $ns_ namtrace-all $namFile $ns_ namtrace-all-wireless $namFile x y #xgraph output files set x0 [open xgraph0.tr w] #flow monitor trace set flowFile [open flowfile w] #extra files set cwndFile [open cwndFile.wtc w] #------------------------------------------------------------------------------- #Define different colors for data flows (for NAM) $ns_ color 1 Blue $ns_ color 2 Red $ns_ color 3 Green #------------------------------------------------------------------------------- #creating the error model set m1_ubstate 27.0 set m1_bstate 12.0 set m2_ubstate 0.4 set m2_bstate 0.4 set durlist "$m1_ubstate $m1_bstate $m2_ubstate $m2_bstate" #set em [new ErrorModel/ComplexTwoStateMarkov $durlist time] set em [new ErrorModel] $em unit bit $em ranvar [new RandomVariable/Uniform] $em set rate_ 0.1 $em drop-target [new Agent/Null] #$em drop-target [new Agent/Null] #the option below is for wired links, there is no links in wireless environment #$ns_ link-lossmodel $loss_module $BS(0) $node_(0) #------------------------------------------------------------------------------- #Creating the nodes # The wired nodes set addresses {0.0.0 1.0.0 1.1.0 1.1.1} set W(0) [$ns_ node [lindex $addresses 0]] #The wireless nodes wireless_node_config $ns_ $topo $em #------------------------------------------------------------------------------- set BS(0) [$ns_ node [lindex $addresses 1]] $ns_ node-config -wiredRouting OFF #base stations nodes $BS(0) random-motion 0 #mobile nodes for {set j 0} {$j < [expr $num_wired_nodes + $num_bs_nodes]} {incr j} { set node_($j) [ $ns_ node [lindex $addresses [expr $j+2]] ] #attach nodes to base station $node_($j) base-station [AddrParams addr2id [$BS(0) node-addr]] } # End Creating the Nodes #------------------------------------------------------------------------------- # Positioning the nodes $BS(0) set X_ 50.0 $BS(0) set Y_ 50.0 $BS(0) set Z_ 0.0 $node_(0) set X_ 0.0 $node_(0) set Y_ 0.0 $node_(0) set Z_ 0.0 $node_(1) set X_ 100.0 $node_(1) set Y_ 0.0 $node_(1) set Z_ 0.0 #------------------------------------------------------------------------------- #create links between wired and BS nodes $ns_ duplex-link $W(0) $BS(0) 2Mb 2ms DropTail down $ns_ duplex-link-op $W(0) $BS(0) orient down $ns_ queue-limit $W(0) $BS(0) 2020Mb #$ns_ duplex-link-op $W(0) $BS(0) queuePos 0.5 #------------------------------------------------------------------------------- #Sizing the mobile nodes this will make them appear in NAM for {set i 0} {$i < $num_wireless_nodes} {incr i} { $ns_ initial_node_pos $node_($i) 10 } #------------------------------------------------------------------------------- # setup TCP connections set tcp1 [new Agent/TCP/Newreno] $tcp1 set class_ 2 $tcp1 set fid_ 1 set sink1 [new Agent/TCPSink/DelAck] $ns_ attach-agent $W(0) $tcp1 $ns_ attach-agent $node_(0) $sink1 $ns_ connect $tcp1 $sink1 set ftp1 [new Application/FTP] $ftp1 attach-agent $tcp1 #------------------------------------------------------------------------------- # The flow monitor #set fmon [$ns_ makeflowmon Fid] #set wllink [$ns_ link $node_(0) $BS(0)] #$ns_ attach-fmon $wllink $fmon #$fmon attach $flowFile #------------------------------------------------------------------------------- #time line scenario. $ns_ at 1.5 "$ftp1 start" $ns_ at [expr $stop-10] "$ftp1 stop" #reset nodes after finishing for {set i 0} {$i < $num_wireless_nodes } {incr i} { $ns_ at $stop.000000 "$node_($i) reset"; } $ns_ at $stop.000000 "$BS(0) reset"; puts "Starting Simulation..." $ns_ at 0.1 "plotWindow $tcp1 $cwndFile" $ns_ at $stop.1 "nam $ns_ $namFile $trFile mixed.nam" $ns_ at $stop.2 "finish" #------------------------------------------------------------------------------- $ns_ run -- Ramy Eid
