Re: AL-HUSSEIN ABOU-ZEID : A Correct Implementation of a Two StateError Model

[Haobo Yu <haoboy@isi.edu>]

Hi, Hussein and Jianping, 

Sorry for the late reply. I've added links to your two state model
and multi-state error model into ns contributed module list. It would be
ideal to integrate these codes, into ns release, but unfortunately we have
run out of people. :( 

Thanks a lot for the contribution. 

- Haobo

> Subject: A Correct Implementation of a Two State Error Model
> To: ns-users@mash.cs.berkeley.edu
> 
> In reference to quite a large number of questions and bug reports on the
> two state error model implementation, I have modified the 2-state error
> model to work in a manner expected by most of us (people trying to
> simulate a fading situation where the channel transitions between a good
> and a  bad state, spending exponentially distributed times in each of the
> states, and the channel transitions are independent of packet
> transmissions).
> 
> For now, the packet is dropped with probability 1 in the bad state and
> with probability 0 in the good state, but you can easily modify this.
> 
> Please refer to the URL
> http://students.washington.edu/~abouzeid/research.htm
> to download the changed files, read more about how the 2 state model is
> different from the original ns implementation, and download a tcl script
> file using such a model.
> 
> Hoping this contribution will be added to the list of contributed modules,
> and hopefully, be part of the next ns version.
> 
> Best regards,
> 
> Alhussein A. Abouzeid
> Fundamentals of Networking Laboratory (FuNLab),
> Department of Electrical Engineering,
> University of Washington, Seattle.