[Cu-wireless] an article on an 802.11 rooftop network

David Young dyoung at ojctech.com
Thu Jul 25 14:21:41 CDT 2002

Sorry, I think I transposed the S and V: it is DSDV that they use.
Direct Sequence Distance Vector, I think.  It is in the book Ad Hoc
Networking, isn't it?

I forget what other reasons that guy gave that 802.11b is not appropriate
for ad hoc networks. I think that there are some challenges, and 802.11b
is certainly not the best (I think 900MHz is a more suitable band,
and there's gotta be a better MAC protocol), but I think 802.11b is
"good enough."  But I *do* welcome attempts to convince me otherwise.

What else is available? I don't know. You can buy parts to build your own
radios. The original 802.11 radios operated at 900MHz. There are whole
systems for ISPs to buy that operate at 900MHz. There is also 5.8GHz
gear. There are different MAC protocols than 802.11 (e.g., something
called TurboCell from KarlNet tweaks 802.11b or otherwise improves your
Lucent/Prism radio).


On Thu, Jul 25, 2002 at 07:58:59AM -0500, stephane_alnet at ureach.com wrote:
> Hi,
> > Forgot the important part. The URL is
> > <http://www.pdos.lcs.mit.edu/papers/grid:bac-meng.pdf>.
> >
> > > Uses 802.11b, OpenBSD, modified DVDS routing protocol.
> I couldn't find much about DVDS in that paper. :(
> So now I've to read yet another paper by Perkins. :(
> > > Prism-based cards may not be affected by BSS partitioning.
> I remember seeing something about bssid in the options for iwpriv on the
> aironet driver tools when I tested the 4521. Would need to look into it.
> Another great link by Dave. :)
> The only thing that struck me (aside from the obvious fact that most
> ad-hoc routing protocols are tested on simulations and thus that most of
> them probably would simply suck in a real-world deployment) is the
> conclusion that 802.11b is not adequate for ad-hoc (ad-hoc being defined
> as "multi-hop self-configuring", so basically what we are looking at).
> I may be over-simplifying, but that seems to become a recurring theme in
> my recent readings. So here comes today's Stupid Question(tm): what else
> is available?
> S.

David Young             OJC Technologies
dyoung at onthejob.net     Engineering from the Right Brain
                        Urbana, IL * (217) 278-3933

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