Re: [ns] Error model in wireless simulation

["Lewie Donckers" <donckers@cs.utwente.nl>]

Hi,

thanks for your help but unfortunately, your code does not work. The problem
(still) lies in connecting the error model to the (wireless) lan model. This
is exactly the problem I already had. I also tried the

$ns lossmodel $em $node0 $node1

command but it gives an error message. When I run ns with your code it gives
me this error:

ns: _o3 lossmodel _o61 _o15 _o37: invalid command name ""
    while executing
"$link errormodule $lossobj"
    (procedure "_o3" line 3)
    (Simulator lossmodel line 3)
    invoked from within
"_o3 lossmodel _o61 _o15 _o37"

Have you got any ideas how to work around this?

Greetings,
Lewie

-- Lewie Donckers
--
-- Computer Science student at the University of Twente, the Netherlands
-- donckers@cs.utwente.nl
-- http://www.cs.utwente.nl/~donckers/


> here is a sample which might help. say i have two nodes
> s1 and rout and i want to insert a multistate error model
> between there two nodes.
>
> set s1 [$ns node]
> set rout [$ns node]
>
> set tmp [new ErrorModel/Uniform 0.0 pkt]
> set tmp1 [new ErrorModel/Uniform 1.0 pkt]
>
> set m_states [list $tmp $tmp1 ]
>
> set m_periods [list 0.3 0.5 ]
> set m_transmx { {0.45 0.55} {0.55 0.45} }
> set m_trunit pkt
> set m_sttype time
> set m_nstates 2
> set m_nstart [lindex $m_states 0]
>
> set em [new ErrorModel/MultiState $m_states $m_periods $m_transmx
> $m_trunit $m_sttype $m_nstates $m_nstart]
> $em drop-target [new Agent/Null]
>
> $ns at 0.1 "$ns lossmodel $em $s1 $rout"
>
>
> at time 0.1 it will insert the lossmodel between nodes s1 and
> rout.