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[Ham-80211] Why? (was Handoff between access point? )

Carl Walthall n8cdw at direcway.com
Wed Nov 24 23:35:57 UTC 2004

Hi Larry

Thanks for the information! I have access to a small city wide 802.11B
network setup by a friend 3 or 4 years ago before he learned that he was
violating part 15. The system has 13 towers at 50 feet around the city and
the central tower is 200 feet. Each tower has a 5 watt amp and 14 or 24 DBi
antenna. Currently the system is running, but the commercial usage has been
discontinued. I started thinking about this because of the new 802.11 cell
phones under development and watching this group.

I was think the ham's here could use Voip to communicate with each other
using a laptop or maybe one of the new phones. We could use it for sending
emergency information during a disaster? But I am new to all this and just
experimenting until I make sure we are following part 97.

Thanks Again

----- Original Message ----- 
From: "Larry Cerney" <lcerney at viawest.net>
To: "'TAPR Mailing List for Ham Radio Use of 802.11'"
<ham-80211 at lists.tapr.org>
Sent: Wednesday, November 24, 2004 10:14 AM
Subject: RE: [Ham-80211] Why? (was Handoff between access point? )

> Carl,
> It is doable, technically.  A citywide network would need multiple access
> points spread throughout the city.  They must all be aware of their
> neighbors in the network and in its simplest form be on the same subnet.
> they are all on the same subnet, the mobile could retain the same IP
> across the city.
> Each AP would need connection to the internet via some sort of VPN to go
> back to a central hub subnet.
> Another way would be to build a mesh network in which AP's work together
> pass data wirelessly back to a central hub.  The problem with doing this
> as the data moves to the hub it is concentrated with data from other AP
> this reduces the effective bandwidth of the network.  This might not be
> critical if your only downloading email, but could bring down a network if
> you kid in the back seat is watching Lord of the Rings via the internet or
> down loading LL Cool J's latest CD. ;-)
> Do a Google search on Wireless Distribution Service or WDS which will
> explain how AP's can work together to pass data from AP to AP wirelessly.
> There will be other way of doing this in the future.  There has been much
> said about 802.16 wireless MAN networks which could be run under Part 97
> might come about commercially soon (next couple of years).
> As I said, it is doable, but don't expect to drive into a town and have
> mobile Internet access anytime soon.
> "The only reason for time is so that everything doesn't happen at once."
> --Albert Einstein
> >
> > Carl Walthall wrote:
> >
> > > Hi All
> > >
> > > If a person setup a large 802.11b network under part 97 city wide
> with
> > > multiple access points running infrastructure.  Could a person with
> a
> > > laptop in their car drive from one end to the other without losing
> > > connection? In other words, could the network be setup to handoff
> the
> > > connection from access point to access point the same as a cell
> phone
> > > would (Mobile IP)? I am sure its not the same, but could you stay
> > > connect as long as your getting a strong signal from a access point?
> I
> > > would also like to know the best place to read up on this subject?
> > >
> > > Thanks in advance
> > >
> > > Carl Walthall
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