baseband-devel January 2018

baseband-devel@lists.osmocom.org

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Engagetted !

by Sébastien Lorquet

http://www.engadget.com/2010/12/29/researchers-eavesdrop-on-encrypted-gsm-c… Congrats!

6 months, 1 week

Calypso BTS

by phreaker1983

I tried to install CalypsoBTS have libosmocore installed, osmo-bts osmobsc, libosmo-netif, libosmo-abis, ortp, trx, libosmo-dsp everything went without errors, following the instructions I created: touch ~/.osmocom/open-bsc.cfg , then when you run : osmo-nitb -c ~/.osmocom/open-bsc.cfg-l ~/.osmocom/hlr.sqlite3-P-C --debug=DRLL:CC:MM:RR:RSL:NM shows me:<0005> bsc_init.c:498 Failed to parse the config file: '/root/.osmocom/open-bsc.cfg' file tried to create as administrator but without success , pleas help me -- View this message in context: http://baseband-devel.722152.n3.nabble.com/Calypso-BTS-tp4026753.html Sent from the baseband-devel mailing list archive at Nabble.com.

4 years, 5 months

Fwd: OSMOCOM-BB HandOver

by Muhammad Awais Aslam

Hi, We have been working on the handover feature in OsmocomBB and have managed to make some progress including SB/BSIC detection in dedicated mode which was not previously being successfully done in firmware. I wanted to share it and seek guidance on the last bit of handover implementation on which we are stuck. I hope someone would be able to help us or make use of our work. We took code related to handover from the osmocom-bb jolly branch by manually adding/deleting stuff in the master branch as updating to the latest copy was giving us issues. We added code from the “Safely change TPU offset on TS change or sync change” commit till the “Use only sel_si for information about the current cell” commit. Using the handover code in the jolly branch and after making the changes explained below we were able to obtain the handover command from the BTS. The synchronized handover case works sometimes though still not every time, however the non-synchronized case doesn't work at all as we are not able to get the physical information command from the new cell. I'll explain the changes/additions we made to achieve this. Firstly, we noted that in dedicated mode SB burst was not being detected. Changes were required at three main places in order to correctly perform FB/SB detection: - It was seen that the results for SB were being read from DSP API location dsp_api.db_r->a_sch which is for the idle mode. The results had to be read from the dsp_api.ndb->a_sch26 location for the dedicated case if TCH_SB_DSP_TASK is used. - After reading the FB we needed to update the quarter-bit offset of the TPU using the TOA of the FB to sync it with the start of frame of the neighbour cell in order to catch the SB (by changing the vaule of l1s.tpu_offset using the TOA of the FB). - Frequency compensation needed to be performed using the afc_correct function before reading the SB. * We actually kind of cheated a bit by adding 3 frames to the original idle frame in order to give us more time to perform FB/SB detection including the synchronizations mentioned above. This was because we weren't that proficient with the code and someone with more understanding could do this better. The call did not get dropped. We used the initial added “idle” frame to perform the quarter-bit and frequency compensation which was reversed in the idle frame with the response function to tune back to the serving cell. These things, when added to the code did the trick and BSIC of the neighbours was obtained. Once the BSICs were decoded the measurement report sent to the BTS became meaningful and the handover command was received. Upon receiving handover command, access bursts needed to be sent on the new channel which again was not currently being implemented properly as in order to tune to the new cell we needed to know its quarter-bit offset for start of frame, frequency compensation and absolute frame number which were not previously being obtained. Now that we were able to detect FB and SB these values were stored for the neighbours following detection of these bursts and were used to tune to a neighbour cell in case of a handover to it before the sending of access bursts. However, here is where we are stuck. We were expecting a physical information message following the access bursts but were not able to receive it due to which the handover failed. If only that could be achieved we believe handover should be successful. Either we are not syncing properly to the new cell or we might not be following GSM protocol properly. We also might not be reading the FACCH properly for physical information message after tuning to the new cell as we couldn't really understand that bit very well. We wanted someone expertise on this matter and were hoping our work could be of use. We were more interested in getting the work done first up. Best Regards, M. Awais Aslam

5 years, 3 months

Approach to system testing for Osmocom stack

by Holger Freyther

Hi, the lua binding code was added to be able to automate OpenBSC tests. In theory we should be able to do this for SMS and UpdateLocation (call handling with MNCC exposing is left as a todo) but in practice we miss a piece of software to coordinate this and run the test. We miss it because it is an interesting problem but also I lost time on switching countries, learning new tricks at a project... The basic testing structure looks easy as well. We want to define the number of concurrent subscribers (0, 10, 100, 1000, n) and to make it simple a single test (UL, send SMS, t) and execute the same test for each subscriber and call it a success if y% of tests succeed within time T. The way to measure this is easy as well. The lua script would print some data (e.g. the name of the ms) when it starts and completes. For some degrees of freedom I don't have a good idea.. and feedback is welcome. I am not sure if I should spawn, configure, add subscribers, a flavor of Osmocom cellular? I look into having some set of templates for the config, the stack to launch and in concept it looks awfully similar to something the GSM tester is doing. Shall we leave virtbts/cellular to the Osmocom tester and just focus on coordinating mobile? My feeling is to leave this to the Osmo GSM tester. If we have n subscribers I would launch m copies of "mobile" (but run multiple MS in a single binary). So with 4 MS per mobile process and 10k subs we would end with 2.5k processes + many log messages coming from each. Would that scale with python? Should we look into doing this one in Go? Or can some of GSM tester be used (the template part)? I would probably design this concurrently with Go(besides being the first). any ideas/comments? holger

5 years, 8 months

OpenBTS OsmocomBB Asterisk

by trixbox.t

Hello! I Need Help I install these three programs OpenBTS, OsmocomBB, Asterisk Then run them, Everything works well OpenBTS sent an SMS to my phones I answered and he checked me I registered into OpenBTS a second phone I tried to transfer SMS between phones - all good but when I try to call from one to another I did not get Asterisk writes ================================================================ *CLI> Retransmission timeout reached on transmission 755803415(a)127.0.0.1 for seqno 179 (Critical Response) -- See wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions Packet timed out after 32001ms with no response ================================================================ Why? What do I do? -- View this message in context: http://baseband-devel.722152.n3.nabble.com/OpenBTS-OsmocomBB-Asterisk-tp402… Sent from the baseband-devel mailing list archive at Nabble.com.

5 years, 9 months

GSM 04.08 L2 pseudo length in ACCH System Information messages

by Vadim Yanitskiy

Hi everyone, I few days ago, during some usual R&D process, I noticed the following messages, appearing in the log output of OsmocomBB/mobile application: "ACCH message type 0xXX unknown." The network, a phone was connected to, was may own and based on more or less recent versions of OsmoNiTB, OsmoBTS, and OsmoTRX. Despite I used to see such messages before, I didn't pay too much attention. But this time I've decided to figure out, what's wrong there... The source of such messages is the gsm48_rr.c / gsm48_rr_rx_acch(): static int gsm48_rr_rx_acch(struct osmocom_ms *ms, struct msgb *msg) { // ... struct gsm48_system_information_type_header *sih = msgb_l3(msg); // ... switch (sih->system_information) { case GSM48_MT_RR_SYSINFO_5: return gsm48_rr_rx_sysinfo5(ms, msg); case GSM48_MT_RR_SYSINFO_5bis: return gsm48_rr_rx_sysinfo5bis(ms, msg); case GSM48_MT_RR_SYSINFO_5ter: return gsm48_rr_rx_sysinfo5ter(ms, msg); case GSM48_MT_RR_SYSINFO_6: return gsm48_rr_rx_sysinfo6(ms, msg); default: LOGP(DRR, LOGL_NOTICE, "ACCH message type 0x%02x unknown.\n", sih->system_information); return -EINVAL; } } To get I bit more details, I modified this function to print the whole L3 payload, and got some interesting results. As it turned out, the payloads were shifted one byte left - there was no 'l2_plen', which is assumed by: /* Section 9.1.3x System information Type header */ struct gsm48_system_information_type_header { uint8_t l2_plen; uint8_t rr_protocol_discriminator :4, skip_indicator:4; uint8_t system_information; } __attribute__ ((packed)); So, my first idea was that this is a bug of OsmocomBB, that would be fairly easy to fix, so after a quick look at the GSM 04.08 specification I wrote (and merged :/) this: https://gerrit.osmocom.org/#/c/5204/ And everything was great, until I connected a 'patched' mobile to a commercial mobile network... And all SI messages during a dedicated connection were false-identified as SI5ter. This seemed strange to me, so I decided to compare a SI message from commercial network with a message captured in my own one: https://habrastorage.org/webt/t8/zs/vv/t8zsvvjjglzfisnjqlnnsy4kgas.png And this confused me even more, then I've expected. Why there is 0x49? Wireshark false-identified this message as something related to SMS... What if this is exactly the 'l2_plen' assumed in OsmocomBB before? I looked at the specifications again, and found out that initially I refered an outdated 5.3.0 version, which was the first link in Google: http://www.etsi.org/deliver/etsi_gts/04/0408/05.03.00_60/gsmts_0408v050300p… while the latest one is 7.21.0: http://www.etsi.org/deliver/etsi_ts/100900_100999/100940/07.21.00_60/ts_100… So, I compared the 9.1.37-40 sections of both versions, and bingo! In the higher version ACCH System Information messages do have the 'L2 Pseudo Length' (10.5.2.19) field. Finally, what I've learned: - OsmocomBB / mobile follows the new version here (with l2_plen); - OsmoNiTB generates the ACCH SI messages without the l2_plen; - Recent Wireshark versions fail to decode the ACCH SI messages with l2_plen, while older ones are able to do that; - I should not merge the changes so quick. My questions are: - Which way of composing the SI messages is correct? - If both are correct, how to parse them correctly? - Should we change OsmoNiTB / OsmoBSC to follow the latest specs? And of course, I have to revert the change I've merged. With best regards, Vadim Yanitskiy.

6 years, 1 month

GAPK merge request

by Vadim Yanitskiy

Hi Sylvain, as you probably already know, I made a few changes in GAPK and now they are in a separate branch called 'fixeria/lib'. In a few words, the main idea of this set of changes is to compose a shared library called libosmogapk and add some basic test coverage. Please see: http://git.osmocom.org/gapk/log/?h=fixeria/lib As you're the maintainer and author of this project, I would like to ask you: is it possible to merge this branch into the mainline? At the moment, the new library is used by OsmocomBB, see: http://git.osmocom.org/osmocom-bb/commit/?h=fixeria/audio&id=0ed60f68b86b47… and moreover I am developing a set of GNU Radio blocks for GSM audio transcoding based on the GAPK library. Probably, some other projects may also benefit from a possibility to link against a shared library and use its features... If you support this idea, please let me know, which way of merging the branch is better for you: - using Gerrit, where I am not sure: if I will send a merge commit for review, would it 'drag' the whole long chain of commits, or the only one? - or using your write access rights. In both cases, I'll provide you detailed description of the merge commit. But first, I need to know your decision. With best regards, Vadim Yanitskiy.

6 years, 3 months

help : osmocombb transfer problem

by hao_zhang

sorry to bother you, i install openbsc and osmocombb in a pc. i want to transfer authentication information rand from osmocombb to openbsc, and transfer sres information from openbsc to osmocombb. What should I do? thanks zhanghao

6 years, 3 months

Building RFFE to work on MSM

by Marek Sebera

Hi, if following architecture is correct https://images.anandtech.com/doci/6541/RadioToday2.png What are currently available chips, using which we can build the RFFE part of BBP (such as Analog Devices ADF4602 or Avago ACPM-7600) so we can start working on UMTS/LTE software/protocol stack implementation on some commonly available Intel/ARM/AMD SoC (or multi-core SoC) ? If the RFFE part of BBP will be stable, work needed on MSM (Mobile Station Modem, i know it's Qalcomm's term) will be tremendous, but not unreal. Also might be partially ported current osmocomBB, but without working RFFE it is really hard to get the software started imho. Or is there something I don't get right now? Thank you Cheers! Marek

6 years, 3 months

Re: osmocomBB with osmo-bts stuck need help

by Vadim Yanitskiy

Hi, > I tried to install Jolly branch many times and this is > the debug result which always stop when sync to BTS. > > I was thinking the package is broken? testing with sylvain > is work, just like yesterday my registering still problem. > but this Jolly branch even cannot produce sync. Hmm, I just found out that both handover related commands are implemented in jolly/testing, but not in sylvain/testing: http://git.osmocom.org/osmocom-bb/tree/src/host/layer23/src/ transceiver/trx.c?h=jolly/testing#n440 http://git.osmocom.org/osmocom-bb/tree/src/host/layer23/src/ transceiver/trx.c?h=sylvain/testing#n369 You can implement a dummy command handler for sylvain/testing. Or use jolly's branch. But as I remember, there was a problem with some firmware images: http://osmocom.org/projects/baseband/wiki/Toolchain > note: as of 2013-10-20, if you use a toolchain with gcc >=4.8, > the firmware can be compiled, but will hang as soon as you want > to sync to an ARFCN. This issue has been fixed in master. > > http://cgit.osmocom.org/osmocom-bb/commit/ > ?id=a903b3c1ee27047c79728b18ff6340d23d1aad2e I think this information is enough to solve your problem. And moreover, we are using the openbsc mailing list, while there is a dedicated one. Let's finish this thread here. And good luck! With best regards, Vadim Yanitskiy.

6 years, 3 months

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baseband-devel January 2018