baseband-devel May 2012

baseband-devel@lists.osmocom.org

30 participants
47 discussions

the cause of error "l1ctl.c:238 Dropping frame with 93 bit errors"
by Chengcheng Gou 21 May '12

21 May '12

I am running the ccch_scan, and the error occurs: <000c> l1ctl.c:238 Dropping frame with 93 bit errors Dropping frame with 84 bit errors <000c> l1ctl.c:238 Dropping frame with 84 bit errors Dropping frame with 83 bit errors <000c> l1ctl.c:238 Dropping frame with 83 bit errors Dropping frame with 86 bit errors <000c> l1ctl.c:238 Dropping frame with 86 bit errors Dropping frame with 85 bit errors <000c> l1ctl.c:238 Dropping frame with 85 bit errors Dropping frame with 71 bit errors <000c> l1ctl.c:238 Dropping frame with 71 bit errors Dropping frame with 78 bit errors <000c> l1ctl.c:238 Dropping frame with 78 bit errors Dropping frame with 80 bit errors <000c> l1ctl.c:238 Dropping frame with 80 bit errors in which situations the error may appear? Does anyone know? Thanks!

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Re: The SMOS project / 72h civil emergency communications system
by Kalle Pietila 20 May '12

20 May '12

Thanks Paul for pointing to this Softbank's press release. Japanese have recently witnessed their local need for civil emergency communications and they also have money to make it happen, not to mention good supporting infrastructure already in place. So it was just matter of time to see someone there addressing this problem. I guess in Japan there is no such earthquake that could compromise the functionality of their mobile core (or at least locals think so). So it is then "just" matter of deploying new balloon-basestations to the disaster area. Someone will go there to the washed-out area with all the required gear, and raise a new BTS-balloon every 3km. On poor countries it will remain as a different story however. it would be interesting to see what kind is that Softbank Mobile's Balloon-BTS proof of concept. I do not know about Softbank but I just directly assume that an operator do not have their own BTS R&D. They must be relying on some existing technology and just make it fly with the balloon. Keeping in mind that one weather sounding balloon can raise 500g payload and probably they will need to feed the power via some sort of cable from the ground level up to the high. So very interesting to follow-up how this all will be implemented in practice. Best Wishes, - Kalle > ---------- Forwarded message ---------- > From: Paul Dart <pauldart(a)gmail.com> > To: baseband-devel(a)lists.osmocom.org > Cc: > Date: Fri, 18 May 2012 09:24:18 +0100 > Subject: Re: The SMOS project / 72h civil emergency communications system > On 17 May 2012 08:17, Alexander Chemeris <alexander.chemeris(a)gmail.com> wrote: >> 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. > > http://www.cellular-news.com/story/54354.php?s=h > > It appears Softbank Mobile have! > > (also I emailed the OP about Telecom Sans Frontier http://www.tsfi.org ) > > Good luck, > > Paul

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Return value for fucntion class_of_band in gsm322.c
by rola 18 May '12

18 May '12

Hi All, I just need a quick clarification on the return value of the function class_of_band in gsm332.c. The switch portion of the function takes care of other bands except 900 band which happen to be isolated separately after the switch statement. By that the 900 band is set to be default and only band to be used. I just want to know if this is deliberate or an oversight. If this situation is actually what I have in mind, I think it will definitely have effect on anyone trying to use Osmocom-bb for other band beside 900. I've been trying to get OBB work for PCS that happen to be only working GSM band in my location with no avail. For this, I need to know if including the 900 band as part of the switch statement will resolve the problem of having PCS band not working. Also is that the only section that need to be corrected in order for PCS band to camp and register with any approved cell in a location. Thank you. Sincerely, Rasak. -- View this message in context: http://baseband-devel.722152.n3.nabble.com/Return-value-for-fucntion-class-… Sent from the baseband-devel mailing list archive at Nabble.com.

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the problem of burst_ind receive SMS in a cell
by Chengcheng Gou 18 May '12

18 May '12

first,the network is not encrypt. I test burst_ind to receive SMS in a cell, but I can`t receive the SMS transfered in my two phone, the two phone is lock to the cell, do I miss anything ? Another problem I am only interest in SMS but not voice,and how to difference the two types of SDCCH? thanks!

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The SMOS project / 72h civil emergency communications system
by Kalle Pietila 18 May '12

18 May '12

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-… .. 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.

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What does FBSB RESP: result=255 mean?
by Joshua Pereyda 16 May '12

16 May '12

Hello, Hopefully this question is appropriate on this list (please let me know otherwise). Running ccch_scan or bcch_scan in the sylvain/burst_ind branch, I keep getting this error: <000c> l1ctl.c:114 FBSB RESP: result=255 I tried checking the code, but I can't quite figure out what's going on. It looks like 255 is an error code, but I don't know where to go from there. This may be related to my SIM card being locked (I think). Running mobile on the sylvain/testing branch, I get: <0005> subscriber.c:625 PIN is required, 3 tries left Will not having the PIN intefere with ccch_scan as well? Thanks, Josh Pereyda

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Has the TMSI has the limitation of using count?
by Chengcheng Gou 15 May '12

15 May '12

I stat the TMSI of my near cell in CCCH, and not find a TMSI occurs more than 6 times; that`s Why?

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How to construct a "Slient SMS"
by Chengcheng Gou 15 May '12

15 May '12

I want to study the Slient SMS, How can it be constructed? Anyone kowns?

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alcatel bic phone?
by Sebastien Lorquet 15 May '12

15 May '12

hello, what do you specialist think of the "bic phone" as an osmocombb candidate? it's very cheap and available in france at various suppliers (including grocery shops!). It seems to be an Alcaltel OneTouch S210 (1) and this wikipedia page (2), even if it does not mention this model, have several models with a MTK or Calypso chipset indication. I searched the best as I could but I didn't find any accurate info. Maybe one of you may have already investigated this thing? (1) http://en.wikipedia.org/wiki/Bic_Phone (2) http://en.wikipedia.org/wiki/Alcatel_Mobile_Phones Regards, Sebastien

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BB can`t send SMS successfully 100%?
by Chengcheng Gou 15 May '12

15 May '12

I use the BB sending SMS, but it can`t be success to do it 100%, Why?

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baseband-devel May 2012