The SMOS project / 72h civil emergency communications system
alexander.chemeris at gmail.com
Thu May 17 11:20:38 UTC 2012
17.05.2012 14:32 пользователь "Kalle Pietila" <kalle.pietila at gmail.com>
> Hi Alexander,
> yes I'm aware that a BTS would need to be transmitting all time, which
> is not best starting point for being power-efficient. However good to
> get confirmation that multi-ARFCN can be avoided. I mailed to BB list
> as I see this part as most probable technical show stopper for this
> initiative. The chip designs seem to be targeted for mobile broandband
> applications with all that unnecessary functionality at a silicon
> screaming for more power. Also proprietary L1 can be a major problem
> when cost of BTS module needs to be kept minimal (modules getting
> lost, damaged, stolen, or vandalized) and also this stuff would need
> to be affordably available for the developers. Actually, SMS-only
> supporting base-stations could be a first viable application for an
> open L1 implementation?
OpenBTS already has an open-source implementation of a base station.
> We're though about balloon raising the antenna up and also flying
> drones with BTS as payload. Flying or floating might work well on
> still weather, but probably not at all under heavy winds. Not sure
> whether this would acceptable shortcoming for the imaginary
> "customer". Balloon-approach might just have worked better in case
> Haiti, I see the point.
To get a reasonable coverage you have to elevate your antenna as high as
possible. So "dropping" it's not an option anyway, imho. You need a manual
labor to install this antennas.
> Thanks for hinting the OpenBTS mailing list, I'll drop a line there too.
> Best Wishes,
> Kalle Pietilä
> On Thu, May 17, 2012 at 10:17 AM, Alexander Chemeris
> <alexander.chemeris at gmail.com> wrote:
> > Hi Kalle,
> > BTS has to transmit constantly on it's main ARFCN, no matter do you
> > make calls or just send SMS. So while you operate a single ARFCN you
> > can't save power by employing only SMS. On the other hand, for SMS a
> > single ARFCN would be enough to provide a good capacity, while support
> > for calls would require a multi-ARFCN config which would be quite
> > power hungry.
> > Have you thought about using a balloon for carrying a BTS instead of
> > dropping to a ground? This would give you much better coverage easily
> > then on-the-ground installation.
> > PS I think this would get more responses from the OpenBTS mailing
> > list, then from OsmocomBB mailing list, as this is definitely a
> > network-side question.
> > On Wed, May 16, 2012 at 10:28 PM, Kalle Pietila <kalle.pietila at gmail.com>
> >> Dear baseband enthusiasts,
> >> on SMOS project we had this crazy idea for catastrophe communications
> >> in which cellular base stations would be miniaturized enough to be
> >> airdropped into disaster zones. We felt that this might
> >> be possible if all functionality except SMS was stripped from the base
> >> stations (hence SMOS, SMS Our Souls). Most ideally such technology
> >> would come in near cellphone size (excluding batteries), something
> >> like osmocom's earlier "Phone acting as BTS" hackwork.
> >> We did not have the guts nor skills to start doing this by ourselves,
> >> so we just published our findings and studies under Creative Commons
> >> BY license. As we wish to keep this idea open to everyone, our
> >> web-documentation would benefit on this regard from some more in-depth
> >> HW-related analysis and suggestions (our team fell short on this
> >> area). Once it's all published, it cannot be patented. I personally
> >> see some humanitarian & karma-improving angle in doing it this way.
> >> Helping human kinds in disaster should not be bound by patent laws.
> >> So I'm asking for constructive criticism and also offering possibility
> >> to write some informal blogs about your views on
> >> www.zygomatica.com/smos (with our team's editorial support) . At the
> >> same time it should be noted that such technically oriented blog
> >> writings at my friends' site zygomatica.com would likely reach 50
> >> readers at most. To put it more nicely, reaching the widest possible
> >> audience is not our focus here anyways.
> >> My technical vision is presented at
> >> .. and the full list of formal documents at end of
> >> http://www.zygomatica.com/smos/ . The other provided background
> >> material might be even more valuable to those that start considering
> >> this idea more seriously.
> >> So, For instance, can stripping down the functionality just to
> >> supporting SMS delivery bring down the power consumption in any
> >> significant manner?
> >> Thanks and regards,
> >> Kalle Pietilä
> >> P.S. Mailed to this list as suggested by Harald.
> > --
> > Regards,
> > Alexander Chemeris.
> > CEO, Fairwaves LLC / ООО УмРадио
> > http://fairwaves.ru
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