##in this program i want to build a topology, in that condition,cbr1 start before cbr0, and cbr1's #bw add to cbr0's is bigger than the wireless channel's bandw. so ,the cbr0 should recover another #path when it start for a time.#set tcpthroughputxg0 [open tcpthroughput0.xg w]set tcpthroughputxg1 [open tcpthroughput1.xg w]set tcpthroughputxg2 [open tcpthroughput2.xg w]set tcpbdeparturespre0 0set tcpbdeparturespre1 0set tcpbdeparturespre2 0set interval 1.5# ======================================================================# Define options# ======================================================================set val(chan)       Channel/WirelessChannelset val(prop)       Propagation/TwoRayGroundset val(netif)      Phy/WirelessPhyset val(mac)        Mac/802_11set val(ifq)        Queue/DropTail/PriQueueset val(ll)         LLset val(ant)        Antenna/OmniAntennaset val(x)              1000   ;#it is 800 beforeset val(y)              1000  ;# Y dimension of the topography  it is 670 beforeset val(ifqlen)         50            ;# max packet in ifqset val(seed)           0.0set val(adhocRouting)   DSRset val(nn)             11          ;# how many nodes are simulated(it is 8 before)set val(cp)             "./cbr-3-test-6"set val(sc)             "./scen-3-test-6.tcl"set record 		"./record-cbr-20.tcl"set val(stop)           50      ;# simulation time(it is 40 before)#puts [Phy/WirelessPhy set bandwidth_ 600000000]  ;#( it is 2e6 before)# =====================================================================# Main Program# ======================================================================## Initialize Global Variables## create simulator instanceset ns_ [new Simulator]# setup topography objectset topo [new Topography]# create trace object for ns and nam#$ns_ use-newtraceset tracefd [open exp-out.tr w]set namtrace    [open exp-out.nam w]$ns_ trace-all $tracefd$ns_ namtrace-all-wireless $namtrace $val(x) $val(y)tracefd# define topology$topo load_flatgrid $val(x) $val(y)## Create God#set god_ [create-god $val(nn)]## define how node should be created##global node settingset chan_ [new $val(chan)]$ns_ node-config -adhocRouting $val(adhocRouting) \                 -llType $val(ll) \                 -macType $val(mac) \                 -ifqType $val(ifq) \                 -ifqLen $val(ifqlen) \                 -antType $val(ant) \                 -propType $val(prop) \                 -phyType $val(netif) \                 -channel $chan_ \		 -topoInstance $topo \                -agentTrance ON \                -routerTrace ON \                -macTrace ON                 ##  Create the specified number of nodes [$val(nn)] and "attach" them#  to the channel.for {set i 0} {$i < $val(nn) } {incr i} {set node_($i) [$ns_ node]$node_($i) random-motion 1;# disable random motion it is 0 before}# # Define node movement model#puts "Loading connection pattern..."source $val(cp)# # Define traffic model#puts "Loading scenario file..."source $val(sc)source $record# Define node initial position in namfor {set i 0} {$i < $val(nn)} {incr i} {    # 20 defines the node size in nam, must adjust it according to your scenario    # The function must be called after mobility model is defined        $ns_ initial_node_pos $node_($i) 20#    $node_($i) radius 700}## 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 0.1 "record0"$ns_ at 0.1 "record1"$ns_ at 0.1 "record2"$ns_ at $val(stop) "put_throughput"$ns_ at  $val(stop).0002 "puts \"NS EXITING...\" ; $ns_ halt"#$ns_ at  $val(stop).0001 "exec nam wireless1-out.nam ; exit 1"puts $tracefd "M 0.0 nn $val(nn) x $val(x) y $val(y) rp $val(adhocRouting)"puts $tracefd "M 0.0 sc $val(sc) cp $val(cp) seed $val(seed)"puts $tracefd "M 0.0 prop $val(prop) ant $val(ant)"#exec xgraph out0.tr out1.tr out2.tr -geometry 800*400 &#exit 0#debug 1puts "Starting Simulation..."$ns_ run