[ns] Mobility extension to ns

[Joerg Widmer <widmer@informatik.uni-mannheim.de>]

Since quite a number of people were interested in the extension but the
installation was often problematic, I updated the installation
instructions. There's is now a step-by-step list how to include the
extension in an existing ns installation as well as a tar-ball
containing a complete ns-allinone with the extension.

The updated webpage is at
http://www.informatik.uni-mannheim.de/informatik/pi4/projects/MobileIP/ns-extension/

To whoever is currently in charge of the ns contributed modules page: it
may be helpful to include a pointer to the above page.

Cheers,
  Joerg


original mail:
> Since some of ns' capabilities for wireless simulations were not
> sufficient for a past project, I had to make some modifications and
> extensions. These as well as some additional tools are now available at
> http://www.icsi.berkeley.edu/~widmer/mnav/ns-extension. I believe they
> may be of interest to others who run into the same problems with
> wireless simulations. Comments and bug reports are of course always
> welcome.
> 
> Modifications:
> - NOAH: a wireless routing agent that (in contrast to DSDV, DSR, ...)
> only supports direct communication between base stations and mobile
> nodes. This allows for the simulation of scenarios where multi-hop
> wireless routing is undesired. Furthermore, NOAH does not send any
> routing related packets.
> - Improvements to the ns Mobile IP implementation, support for
> overlapping service areas of base stations, intelligent selection of
> foreign agents, ...
> - Improved handoff mechanism
> - Simple distance propagation model: when parameters for the exact CMU
> radio propagation model are not available (send/receive power, ...) the
> simple distance propagation model allows to specify the reach of base
> stations as a distance (no signal attenuation). When the necessary
> information is available, the exact model should always be used instead.
> 
> - Modifications to ad-hockey (the CMU visualization tool), support for
> Mobile IP scenarios and some optimizations
> - Plotting tool for aggregate node throughput and single flow throughput
> - Scenario-generator with simple scenario generation language
> facilitating the creation of large scenarios with many base stations