[Olsr-users] Channel Selection for Multi Radio OLSR

[David Murray]

Hi,

With the recent discussion about multiple radios and OLSR I would like 
to put my recent university project out there. TDCS: Table Driven 
Channel Selection is a Channel selection mechanism for multi radio OLSR.

It works by using the drivers scan cache to make initial decisions 
about channel selection and then uses the OLSR routing table to 
stabilize these assignments. I am over simplifying but if an interface 
is currently being used for routing by OLSR, the channel assignment is 
considered stable. If the route is removed and the interface is no 
longer providing a usable route then the interface is reassigned to a 
different channel.

There are also mechanisms to prevent too many nodes from converging on 
the same channel and ways to prevent co located radios from using close 
frequencies (inter radio interference). The other major problem that a 
lot of these schemes encounter is how to ensure that the backbone does 
not form radio islands that are disconnected. TDCS deals with this by 
ensuing that all nodes have connectivity to a single gateway node.

TDCS is written in Ruby and can be found at [1]. If anyone wants to try 
it out I would be very interested in hearing some feedback. The draft 
chapter of my PhD thesis can be found here [2]. Apologies about the 
length. I have a much more concise paper but it has not been published 
yet so email me if you would like an advanced copy.

I have tested TDCS using 8 dual radio ALIX nodes with Atheros CM9's. 
the results I was able to get are reasonably promising (see the 
chapter). Constructive criticism is always welcome. Also, if anyone 
thinks TDCS is a good idea and wants to help, they are more than 
welcome.

Thanks Dave

[1] http://www.it.murdoch.edu.au/~30179198/code/tdcs-0.1.tar.gz
[2] http://www.it.murdoch.edu.au/~30179198/docs/tdcs.pdf DRAFT!