baseband-devel

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2024 discussions

What can I learn about a GSM base station without doing any decryption ?
by Mm Bsd 13 Oct '15

13 Oct '15

Hello, I am using a SDR device (a BladeRF) and there is a nice tool called 'kal' that will show me all of my nearby GSM base stations. In addition to listing base stations and their frequencies, I could also use that frequency info to monitor the beacon channel with gr-scan/airprobe. So at this point I know: - base station exists - I know its frequency - based on beacon channel assignments, etc., I *sort of* know how busy it is. But what else can be learned about a particular base station with simply passive observation and no decryption (and no sim card) ? If all I have is a passive monitor with a SDR, what else can I learn frmo the beacon channel or from the station itself ? Is it possible to learn things like software version, protocols supported, connectivity to network, or to other base stations ? My goal is to learn about the GSM networks around me and I wonder how deeply I can understand them with just passive observation of the beacon channel (or other sources of info that can be seen with SDR). Thank you.

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Oct 15, 8pm / OSMUG: "Running OpenAirInterface"
by Harald Welte 09 Oct '15

09 Oct '15

Hi all! This is an announcement for an "irregular" Berlin Osmocom User Group event. David Rupprecht of Ruhr-Uni Bochum has offered to give us a presentation sharing his experience in Running OpenAirInterface. OpenAirInterface (http://openairinterface.eurecom.fr/) is a project of the Eurecom research institute in Sofia Antipoils / France. For many years they have been working towards an open source SDR LTE implementation. The presentation will be held on Oct 15, 8pm @ IN-Berlin, Lehrter Str. 53, 10557 Berlin (yes, this is _NOT_ CCC Berlin where regular OSMUG meetings are held!) The meeting is open to anyone interested in mobile communications. You do not have to be involved with the Osmocom projects in order to attend. Anyone interested in mobile communications protocols is welcome. If you are interested to show up, feel free to do so. The meeting is "free as in free beer", despite no actual free beer being around ;) More information about the venue can be found at http://www.in-berlin.de/space/ The official event announcement website is http://openbsc.osmocom.org/trac/blog/david-rub-openair-20151015 Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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OsmoTRX on Pirelli DP-L10 restarts phone
by Tobias Mädel 05 Oct '15

05 Oct '15

Hello, I'm currently trying to use a Pirelli DP-L10 calypso phone as a rudimentary BTS. I have followed the instructions on http://openbsc.osmocom.org/trac/wiki/network_from_scratch, I'm using the jolly/testing branch of osmocom-bb and I've enabled TX support in the Makefile. The software runs on an xubuntu 14.04 x64 machine. After uploading the firmware to the phones RAM via osmocon, it shows that it's running osmocom-bb on the display, when I then try to run transceiver with the following parameters: -e 5 -r 99 (or alternativly -e 5 -a 958 to sync with german provider O2) the phone just reboots and goes into a state where the keyboard backlight is blinking with 0.5 hertz. The last thing "transceiver" says is: <0012> l1ctl.c:383 Reset received: Starting sync. <000c> l1ctl.c:95 Sync Req <000c> l1ctl_link.c:171 Sending: '01 00 00 00 83 be 00 64 27 10 03 20 03 07 00 00 00 ' and the last log messages from osmocon are: DSP API Version: 0x3606 0x0000 LOST 7200! L1CTL_RESET_REQ: FULL!L1CTL_FBSB_REQ (arfcn=33726, flags=0x7) Dropping sample ':' I'm not sure if I have configured the correct bands for synchronization. I think it might have to do something with that. I copy'd the default configuration from the osmocom-page stating DCS1800. The only base station I'm seeing here is 958, which is in the GSM900R range. Could this be the problem? Have I overseen something simple? Have I provided all necessary information about my setup? Any ideas? It's probably not a power issue, I have tested it with a lab power supply for providing the USB 5V and battery 4.2V, which resulted in the same behavior. Thanks, Tobias -- This email is encrypted with 2ROT-13. Tobias Mädel t.maedel(a)alfeld.de PGP: 3A69 E9AF 3FA9 3BCF FE50 9694 494E 2F56 C304 60E1 http://tbspace.de

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Oct 07, 8pm / Osmocom Berlin User Group meeting
by Harald Welte 04 Oct '15

04 Oct '15

Hi all! This is the announcement for the re-incarnated Osmocom Berlin meeting: Oct 7, 8pm @ CCC Berlin, Marienstr. 11, 10117 Berlin Harald will be presenting about the Iuh protocol stack of UMTS small cells / femtocells and his work towards implementing it as part of Osmocom. Agenda: 20:00h Welcome 20:15h Presentation about Iuh / osmo-iuh 21:00h Informal meeting / chatting The meeting is open to anyone interested in mobile communications. You do not have to be involved with the Osmocom projects in order to attend. Anyone interested in mobile communications protocols is welcome. If you are interested to show up, feel free to do so. There is no registration required. The meeting is free as in "free beer", despite no actual free beer being around. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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Re: Oct 07, 8pm / Osmocom Berlin User Group meeting
by Mychaela Falconia 03 Oct '15

03 Oct '15

Harald Welte <laforge(a)gnumonks.org> wrote: > This is the announcement for the re-incarnated Osmocom Berlin meeting: > > Oct 7, 8pm @ CCC Berlin, Marienstr. 11, 10117 Berlin And for those who happen to be on the other side of the world (Southern California instead of Germany, San Diego instead of Berlin), there is this other meeting/presentation on a related topic happening about a day and a half later in Universal Time: http://www.meetup.com/kernel-panic/events/225595627/ > If you are interested to show up, feel free to do so. There is no > registration required. The meeting is free as in "free beer", Same for ours. > despite no actual free beer being around. While we don't serve beer either (for one thing, the venue who graciously provide us with free meeting space would have a problem with alcohol on the premises), we do usually have free refreshments as in soft drinks and cookies. M~

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CalypsoBTS timeslots allocation
by Вадим Яницкий 17 Sep '15

17 Sep '15

Hello, list! I am trying to make working two and more TCH channels in OpenBSC (NiTB mode) with calypso based phones. How to understand timeslots allocation in this strings of transceiver app? as->l1l[0].tx_mask = 0xe3; /* TS 5,6,7,0,1 */ as->l1l[0].rx_mask = 0x01; /* TS 0 */ Why 2, 3, 4 timeslots is not used? And how to connect more than two phones to the transceiver? Should I add a new TRX in OpenBSC config and/or modify source code of the transceiver app? With best regards, fixeria.

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Osmocom Berlin User Group revival?
by Harald Welte 09 Sep '15

09 Sep '15

Dear all, After two years of intermission, I'm currently pondering to revive the Osmocom Berlin User Group and would like to understand a) who would be interested in attending? b) which day(s) of the week would be preferred / not preferred? Instad of "just" hanging out, chatting about Osmocom related topics etc. I am interested in having actual topics for each of the meetings. There is no need for a formal presentation or anything like that, but at least let's try to stay focussed on the topic for the first hour or so, and then conclude with a more general chat towards the end. Some of the topics that I would like to start with ASAP: * sharing of knowledge regarding 3G and 4G protocol stacks (I'm looking a lot at this recently, and it is a good time to talk about what I've learned) * completing the work towards splitting osmo-nitb into osmo-bsc and osmo-mss - as a first stept towards adding RANAP/Iu to osmo-mss * attempting to decode/analyze BVG bus/tram radio (TETRAPOL) using tetrapol-kit from http://brmlab.cz/git/tetrapol-kit.git * are berlin S-Bahn trains actually still broadcasting their GPS position in MPT1327? * moving ahead with AT91SAM3S based SIMtrace2 with MITM support Let me know who is interested in joining. In terms of venue I would suggest to again use the CCCB, unless somebody objects. We could of course also ask our friends at IN-Berlin or C-Base. In terms of schedule, I would actually want to go for bi-weekly again. Happy hacking, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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network-from-scratch(calypso-setup)-several phones and gprs
by Erich Dachleger 08 Sep '15

08 Sep '15

I was also wondering about if is is possible to use network-frm-scratch setup (calypso-transceiver) with more phones to get more TCH channels as well as gprs? Regards erich Hello, list! I am trying to make working two and more TCH channels in OpenBSC (NiTB mode) with calypso based phones. How to understand timeslots allocation in this strings of transceiver app? as->l1l[0].tx_mask = 0xe3; /* TS 5,6,7,0,1 */ as->l1l[0].rx_mask = 0x01; /* TS 0 */ Why 2, 3, 4 timeslots is not used? And how to connect more than two phones to the transceiver? Should I add a new TRX in OpenBSC config and/or modify source code of the transceiver app? With best regards, fixeria.

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AMR support and B_PLAY_UL
by Anton Guryanov 23 Aug '15

23 Aug '15

Hi, I tried to add simple AMR support in osmocombb project. I tested it with C123 (DSP API v 36). I set AMR config from assigment command, set AMR detection thresholds, make sync, etc. It looks like downlink works fine, but I have problem with uplink: it send data directly from microphone and ignore data in dsp_api.ndb->a_du_1 even if I set dsp_api.ndb->d_tch_mode|=B_PLAY_UL. Also, I can see uplink data on dsp_api.ndb->a_du_0 like B_PLAY_UL is fully ignored. Did anyone have that issue before? I know that AMR codec is more complex that TCH, but did someone know a way to send custom data from host using AMR codec? Best regards, Anton

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Adding features from osmocom-bb to libosmocore
by Piotr Krysik 01 Aug '15

01 Aug '15

Hi all, I'm developing gr-gsm project which uses GNU Radio framework in order to build infrastructure for receiving GSM data. Recently we've added libosmocore as a dependency in order to use it's implementation of ciphering algorithms. I would like to use more of the code that was already implemented thanks to your work, but I've found some parts that I would expect to be in libosmocore are not in there but in osmocom-bb. One of the examples is interpretation of system information messages that is in src/host/layer23/src/common/sysinfo.c. Is it possible to move parts that are usable for projects outside of osmocom into libsomocore? If yes - how can I proceed with that? I'm aware that it is not simple process as it involves also removing these parts from osmocom-bb and maybe also editing them in order to make them independent of osmocom-bb. -- Best Regards, Piotr Krysik

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