This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/baseband-devel@lists.osmocom.org/.
Alexander Chemeris alexander.chemeris at gmail.com17.05.2012 14:32 пользователь "Kalle Pietila" <kalle.pietila at gmail.com> написал: > > 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> wrote: > >> 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 > >> http://www.zygomatica.com/wp-content/uploads/2012/04/SMOS6-Technical-goals-System-requirements-v10.pdf > >> .. 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20120517/57036f0d/attachment.htm>