ns-ber.tcl

CBRP协议（移动adhoc中基于分簇的路由协议）ns2下的源码

#
# Copyright (c) 1996 Regents of the University of California.
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#       This product includes software developed by the Daedalus Research
#       Group at the University of California Berkeley.
# 4. Neither the name of the University nor of the Research Group may be
#    used to endorse or promote products derived from this software without
#    specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Contributed by the Daedalus Research Group, UC Berkeley 
# (http://daedalus.cs.berkeley.edu)
# Support code for error generation based on packet-, byte- or time-based models.

# Note: Multi-state Markov models not supported yet (coming soon!).

proc newErrorU {rate unit} {
        set em [new ErrorModel]
        set rv [new RandomVariable/Uniform]
	$rv set min_ 0
	$rv set max_ [expr 2*$rate]
	$em ranvar $rv
	$em unit $unit
        $em set rate_ $rate
	return $em
}

proc newErrorE {rate unit} {
        set em [new ErrorModel]
	set rv [new RandomVariable/Exponential]
	$rv set avg_ $rate
	$em ranvar $rv
        $em set avg_ $rate
	$em unit $unit
	return $em
}	

proc newErrorM {unit} {
        set em [new ErrorModel/Markov time]
        set rvGood [new RandomVariable/Exponential]
        $rvGood set avg_ 1
        set rvBad [new RandomVariable/Exponential]
        $rvBad set avg_ 0.005
        $em ranvar $rvBad 1 0.5
        $em ranvar $rvGood 0 0.001
	$em unit $unit
        return $em
}

proc create-error {num rate errmodel unit} {
        global ns opt
        global lan node source

	# default is exponential errmodel
	if { $errmodel == "uniform"} {
		set em newErrorU
	} elseif { $errmodel == "markov" } {
		set em newErrorM
	} else {
		set em newErrorE
	}
	

        set src $node(0)
        set sifq [$lan get-ifq $src]
        set slabel [[$lan get-mac $src] set label_]
        for {set i 1} {$i <= $num} {incr i} {
                set dst $node($i)
		# Cdls is the Channel State Dependent Link Scheduler
                if ![string compare $opt(ifq) Cdls] {
                        [$lan get-ifq $dst] error $label0 [newErrorM]
                        $sifq error [[$lan get-mac $dst] set label_] \
					[newErrorM $unit]
                } else {
                        $lan install-error $src $dst [$em $rate $unit]
                        $lan install-error $dst $src [$em $rate $unit]
                }
        }
}