[ns] Error Model in ns-2.29

[Svilen Ivanov]

Hello,

the attached example script is for network emulation, but you should be 
able to use the error modeling for a simulation as well.

The lines 55 - 62 create an object in each node for error modeling. It 
drops 1 percent of the packets.

proc UniformErr {} {
    set err [new ErrorModel]
    $err unit packet
    $err set rate_ 0.01
    $err ranvar [new RandomVariable/Uniform]
    $err drop-target [new Agent/Null]
    return $err
}


Line 89

-IncomingErrProc UniformErr

is also important. It is more realistic to use IncommingErrProc, because 
in this case each node determines whether it receives a packet or not on 
its own. Therefore a subset of all nodes around receive a packet. In the 
case of OutgoingErrProc all the nodes around either receive a packet or not.

Regards,
Svilen

qadous at ccse.kfupm.edu.sa wrote:

>Dear ns users,
>
>Would you please send me examples for Error modeling in ns-22.9.
>
>how to model that with wireless nodes.
>
>The ns tutorial is not good enough.
>
>thank you in advance.
>Regards
>
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-- 
+------------------------------------------+
| M.Sc. Svilen Ivanov                      |
| Institute for Distributed Systems (IVS)  |
| Otto-von-Guericke University - Magdeburg |
| http://ivs.cs.uni-magdeburg.de/~svilen/  |
+------------------------------------------+