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Re: [ns] BandWidth of Wireless Network in ns2



Maybe I didn't understand your question clearly. But if
you pump the packets at different rate at the senders, why
do you expect the receivers will receive the same amount
of packets?


Kun-chan Lan


On Mon, 5 Mar 2001, Robert Yin wrote:

> 
> 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
> 
>