Re: ANNOUNCE: Release of the NAB simulator

Hi Mark, 

> In the EPFL scenario simulations, how do you compute connectivity? Do you
> have a radio range model or something more sophisticated (e.g., shadowing)?

The connectivity model is a simple unit disk radio range model (node pairs
within distance < radio range are connected, node pairs with greater 
distance than radiorange are not).

There is no modeling of shadowing with buildings, etc. 

BTW on this topic the next release of NAB will contain radio propagation 
model.


> How do you define the buildings (i.e., how do you define the restricted
> mobility model?)?

The campus is modeled as a set of 'points of interest' (ie buildings, 
outdoor areas, points along a road). Each point of interest is connected 
to other nearby points, in such a way that the direct path between each 
point respects the campus toplogy. There are currently ~ 120 points in the 
epfl topology, see gui/epflcoords.ml.

The mobility model can be seen as a 'random waypoint on a graph':
A node is initially dropped down at random on one of these points of 
interest. It picks at random any other point of interest. Then, the 
shortest path route is computed to reach the point of interest *via the 
graph of available points*. The node then moves along this path until the 
desired point of interest is reached. This is intended to model the fact 
that in a real (campus or urban) environment, nodes do not move in a 
straight line toward their target, but of course move along paths and 
around obstacles. 

Hope this helps.
I've added the above description to sim/mob/mobs.mli


Henri