capture-scenario.tcl

对IEEE 802.11e里的分布式信道接入算法EDCA进行改进

#
# A wireless lan scenario to study the capture effect
#
#

# defaults
set num_nodes 7					;# number of mobilenodes in the scenario
set pktsize 512					;# pktsize for background traffic
set endtime 120
# Queue set limit_ 200

proc create_scenario { } {
	global ns_ node_ num_nodes
	global pktsize

	##########################################################
	# Setup FTP flows

	for {set i 1} {$i < $num_nodes} {incr i} {
		set B		[new Application/FTP]
		set B_src	[new Agent/TCP]
		set B_sink	[new Agent/TCPSink/DelAck]

		$B_src		set packetSize_ $pktsize
		$B_src		set class_ [expr $i + 1]

		$ns_ attach-agent $node_(0) $B_src
		$ns_ attach-agent $node_($i) $B_sink
		$ns_ connect $B_src $B_sink
		$B attach-agent $B_src
		puts "FTP B$i with pktsize $pktsize flows from Node0 to Node$i"

		$ns_ at 3.0 "$B start"
	}
}