[Ns-developers] a new 802.11 PHY and MAC

[Mathieu Lacage]

On Sat, 2005-03-26 at 23:28 -0800, Gavin Holland wrote:
> > I also was very interested by the idea of using lazy event evaluation
> > to minimize the number of simulation events generated by the MAC and
> > the PHY. Implementing these ideas requires, alas, an architecture very
> > different from the one you used. A paper was presented at mswim 2004
> > which gives a few leads on these lazy evaluation ideas implemented in
> > opnet I think. If I remember correctly, it is 
> > "Scalable Simulation of Large-Scale Wireless Networks with Bounded
> > Inaccuracies" by Zhengrong Ji (UCLA, USA), Junlan Zhou (UCLA, USA),
> > Mineo Takai (University of California, Los Angeles, USA),
> > Rajive Bagrodia (University of California at Los Angeles, USA). 
> 
> Thanks for the link.  Actually, I browsed the paper and their "lazy
> evaluation" appears to be almost identical to my implementation.  Only

I did not understand you did that. Although this was almost one year
ago, I remember being unable to understand how your code really worked
and why it was done that way. Maybe the "architectural" problems I saw
there at that time were merely related to my inability to figure out how
the code worked.

> the handling of BO seems different.  Would be interested in hearing 
> more about the architecture problems (offline).

I am trying to lazily evaluate the end of transmission events and
defer/backoff events.

> > In case you are interested, I modified your code to implement some new
> > rate control algorithms and hossein did work on modulation/error rate
> > calculation. I plan to use this codebase as a reference to perform
> > initial validation tests on the new PHY/MAC.
> 
> Sure, I'd like to see that.  Thanks.

I'll talk to hossein and will try to figure out how to best send you
this code on tuesday

Mathieu