Re: [ns] BandWidth of Wireless Network in ns2

["Robert Yin" <gis88536@cis.nctu.edu.tw>]

Hi,
   I use the LossMonitor just like Marc Greis' tutorial to calculate
   the bandwidth for 5 CBR flows.  And I use the wireless.tcl in the
   tcl/ex directory. In these 2 simulations, the tcl file for each flow is 
   as following:

<< First Simulation >>
set udp_(0) [new Agent/UDP]
$ns_ attach-agent $node_(0) $udp_(0)
set sink0 [new Agent/LossMonitor]
$ns_ attach-agent $node_(1) $sink0
set cbr_(0) [new Application/Traffic/CBR]
$udp_(0) set fid_ 0
$cbr_(0) set packetSize_ 300
$cbr_(0) set rate_   220000.0
$cbr_(0) attach-agent $udp_(0)
$ns_ connect $udp_(0) $sink0
$ns_ at 0.0 "$cbr_(0) start"

<< Second Simulation >>
set udp_(0) [new Agent/UDP]
$ns_ attach-agent $node_(0) $udp_(0)
set sink0 [new Agent/LossMonitor]
$ns_ attach-agent $node_(1) $sink0
set cbr_(0) [new Application/Traffic/CBR]
$udp_(0) set fid_ 0
$cbr_(0) set packetSize_ 300
$cbr_(0) set interval_ 0.008
$cbr_(0) attach-agent $udp_(0)
$ns_ connect $udp_(0) $sink0
$ns_ at 0.0 "$cbr_(0) start"

 The  transmission rate of these 2 simulations is different. The total
 bandwidth of first one is about 1.1 MByte, and second one is 
 about 1.3 MByte. Why the total bandwidth of these 2 wireless 
 simulations are different ?
 
 Thx.
 
 Robert

> can yu give out more details how you can calculate the
> bandwidth in your simulation?
> 
> 
> Kun-chan Lan
> 
> 
> On Sun, 4 Mar 2001, Robert Yin wrote:
> 
> > Hi,
> > 
> >   I use 5 CBR traffic sources in wireless networks.
> >   All nodes do not move. When I use different CBR transmission 
> >   rate in 2 simulations, the total bandwidth of these 2 simulations 
> >   is not equal.
> >   Could anyone tell me why ?
> > 
> >   Thx.
> > 
> >   Robert