OpenBSC December 2025

openbsc@lists.osmocom.org

26 participants
47 discussions

[PATCH 4/4] core/conv: Add optimized Viterbi decoding
by Vadim Yanitskiy 15 Apr '26

15 Apr '26

Hi Tom and all, After a quick look at the 4th patch, related to your optimized Viterbi decoder, I have noticed that currently the convolutional code definitions from the 'src/gsm/gsm0503_conv.c' are out of the 'tests/conv' test coverage... So, I would like to extend the test coverage. All I need are the test vectors, which I'll add to existing ones. Some of them I already found in your 4th patch, but some pending I need to write myself. Right now I have a simple question... Let's look at one example: { .name = "GSM RACH (non-recursive, flushed, not punctured)", .code = &gsm_conv_rach, .in_len = 14, .out_len = 36, // ??? .has_vec = 0, .vec_in = { }, .vec_out = { }, } As I noticed, the 'in_len' may be taken from the code definition: const struct osmo_conv_code gsm0503_rach = { .N = 2, .K = 5, .len = 14, // The 'in_len' is here! .next_output = xcch_output, .next_state = xcch_state, }; But I don't know how to calculate the 'out_len'... Could you please give me some hint? I already started to work on your 4th patch: https://gerrit.osmocom.org/1542 https://gerrit.osmocom.org/1543 With best regards, Vadim Yanitskiy.

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Is It Worth It to Pay Someone to Take My Online CompTIA Exam?
by olivianaylor322＠gmail.com 09 Apr '26

09 Apr '26

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Managing Complicated Laws in BSC Implementations
by Fennellmarian018＠gmail.com 09 Apr '26

09 Apr '26

The complexities of Base Station Controller (BSC) integration in open-source mobile networks have presented me with a number of overlapping areas pertaining to telecommunications legislation and regulatory compliance. In order to better comprehend how international legal standards affect open BSC installations in various jurisdictions, this intersection has unanticipatedly prompted me to seek [url=https://dissertationwritinghelp.uk/law-dissertation-help/]law dissertation help[/url]. I would love to hear from anyone else who has studied legal issues in their OpenBSC-related academic or practical work, as well as suggest some books.

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Artvigil Australia: A Trusted Solution for Enhanced Focus and Wakefulness
by csheldon756＠gmail.com 31 Mar '26

31 Mar '26

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How to Play and Experience Heardle: A Musical Challenge
by subtle.carp.skco＠protectsmail.net 25 Mar '26

25 Mar '26

Are you ready to put your music knowledge to the test? If you love games that challenge your memory and quick thinking, you’ll enjoy Heardle. This addictive game invites players to guess a song based on short audio clips, making it a delightful experience for music lovers and casual gamers alike. Either alone or with friends, Heardle can provide a fun and engaging way to connect through music. https://heardlefree.com/ Gameplay The aim of Heardle is simple: guess the song title using limited audio clues. When you begin, the game plays an initial snippet of a song—typically just a few seconds long. From there, players have six attempts to guess the correct title. Each incorrect guess prompts an additional segment of the song to be revealed, gradually giving you a better chance at making your correct guess. To start playing, visit Heardle, where you’ll find a user-friendly interface. Upon loading, you will be greeted with a "Play" button to kick off the challenge. Once you’ve made your guesses, the game provides immediate feedback, telling you whether your guess was correct and, if not, allowing you to try again until you either guess the song or run out of attempts. Heardle has a different song each day, keeping the experience fresh. There’s no way to repeat a level, which means every day offers a new challenge and a new chance to flex those musical muscles. Tips for Playing Know Your Genres: If you have a favorite genre of music, use that to your advantage! Often, the daily song will belong to a familiar genre, so leverage your own taste to narrow down your guesses. Pay Attention to Context: Sometimes the first snippet might give away an artist or specific musical characteristic—like a distinctive guitar riff or vocal style. Listen closely and let those nuances guide your guesses. Use a Process of Elimination: If you’re unsure but have a few songs in mind, start guessing songs you’re relatively sure of. As you hear more of the song, you can refine your guesses based on the additional snippets. Play with Friends: Heardle can be even more fun when played with friends. Compete to see who can guess the song first or who can guess it in the least attempts. This also adds a social aspect to your gameplay, making it a shared challenge. Practice Regularly: Like any skill, getting better at Heardle takes practice. The more you play, the more familiar you become with popular tracks, artists, and styles, enabling you to make quicker guesses down the road. Conclusion Heardle is not just an entertaining game; it’s also a fantastic way to engage with music on a daily basis. Whether you're a casual listener or a seasoned aficionado, the thrill of uncovering a song you love creates an exciting experience each day. With its engaging format and user-friendly interface, Heardle is a must-try for anyone looking to challenge their musical knowledge. So grab your headphones, gather your friends, and see who can guess the daily hit first! Remember to enjoy the process and celebrate those musical memories, one note at a time. Happy playing!

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OsmoTRX+B205mini crashes when having another USB device on a different port
by JPichel 20 Mar '26

20 Mar '26

Hello everyone, I am experiencing problems when trying to run osmotrx with a b205mini and I connect another USB device to a different port on the machine. When I do this, osmotrx crashes instantly. Also, when I have the other device already plugged in when I start osmotrx, it takes ~20 seconds to crash. Sometimes it just crashes without giving a reason, like here: DLGLOBAL NOTICE Setting SCHED_RR priority 18 (cpu_sched_vty.c:471) DLGLOBAL NOTICE Setting SCHED_RR priority 18 (cpu_sched_vty.c:471) DLGLOBAL NOTICE Available via telnet 127.0.0.1 4237 (telnet_interface.c:88) DLCTRL NOTICE CTRL at 127.0.0.1 4236 (control_if.c:1024) [INFO] [UHD] linux; GNU C++ version 11.2.0; Boost_107400; UHD_4.1.0.5-3 DMAIN NOTICE -- Transceiver active with 1 channel(s) (osmo-trx.cpp:621) DLSTATS NOTICE Stats timer expire_count=7: We missed 6 timers (stats.c:169) DLGLOBAL NOTICE Stats timer expire_count=31: We missed 30 timers (rate_ctr.c:350) DTRXCTRL NOTICE Changing TSC from 0 to 7 (Transceiver.cpp:1032) DTRXCTRL NOTICE [chan=0] switching to TRXD version 1 (Transceiver.cpp:1059) DMAIN NOTICE Starting the transceiver (Transceiver.cpp:287) LLDTRXCLK NOTICE Sending CLOCK indications (Transceiver.cpp:1198) UDDEV ERROR No packet received, implementation timed-out (UHDDevice.cpp:782) DDEV FATAL UHD: Receive timed out (UHDDevice.cpp:786) DMAIN FATAL Receive error 0 (radioInterface.cpp:340) DTRXDUL FATAL Something went wrong in thread RxLower, requesting stop (Transceiver.cpp:1359) DMAIN NOTICE Shutting down transceiver... (osmo-trx.cpp:588) DMAIN NOTICE Stopping the transceiver (Transceiver.cpp:345) terminate called without an active exception Aborted And sometimes it reports an USB error and shows the talloc report: DMAIN NOTICE -- Transceiver active with 1 channel(s) (osmo-trx.cpp:621) DLSTATS NOTICE Stats timer expire_count=6: We missed 5 timers (stats.c:169) DLGLOBAL NOTICE Stats timer expire_count=26: We missed 25 timers (rate_ctr.c:350) DTRXCTRL NOTICE Changing TSC from 0 to 7 (Transceiver.cpp:1032) DTRXCTRL NOTICE [chan=0] switching to TRXD version 1 (Transceiver.cpp:1059) DMAIN NOTICE Starting the transceiver (Transceiver.cpp:287) DTRXCLK NOTICE Sending CLOCK indications (Transceiver.cpp:1198) LLUterminate called after throwing an instance of 'uhd::io_error' what(): EnvironmentError: IOError: usb rx6 transfer status: LIBUSB_TRANSFER_OVERFLOW signal 6 received talloc report on 'OsmoTRX' (total 8531 bytes in 29 blocks) rate_ctr.c:233 contains 1160 bytes in 1 blocks (ref 0) 0x559c72388720 trx_rate_ctr.cpp:343 contains 8 bytes in 1 blocks (ref 0) 0x559c723886b0 trx_rate_ctr.cpp:342 contains 40 bytes in 1 blocks (ref 0) 0x559c72389540 trx_rate_ctr.cpp:341 contains 32 bytes in 1 blocks (ref 0) 0x559c723895d0 telnet_connection contains 1 bytes in 1 blocks (ref 0) 0x559c723893d0 struct sched_vty_opts contains 72 bytes in 1 blocks (ref 0) 0x559c723489f0 logging contains 6197 bytes in 13 blocks (ref 0) 0x559c722c5d10 struct trx_ctx contains 1021 bytes in 8 blocks (ref 0) 0x559c722a0e80 msgb contains 0 bytes in 1 blocks (ref 0) 0x559c722c3ac0 full talloc report on 'OsmoTRX' (total 8531 bytes in 29 blocks) rate_ctr.c:233 contains 1160 bytes in 1 blocks (ref 0) 0x559c72388720 trx_rate_ctr.cpp:343 contains 8 bytes in 1 blocks (ref 0) 0x559c723886b0 trx_rate_ctr.cpp:342 contains 40 bytes in 1 blocks (ref 0) 0x559c72389540 trx_rate_ctr.cpp:341 contains 32 bytes in 1 blocks (ref 0) 0x559c723895d0 telnet_connection contains 1 bytes in 1 blocks (ref 0) 0x559c723893d0 struct sched_vty_opts contains 72 bytes in 1 blocks (ref 0) 0x559c723489f0 logging contains 6197 bytes in 13 blocks (ref 0) 0x559c722c5d10 vty_logp_doc_str contains 1377 bytes in 1 blocks (ref 0) 0x559c7231c040 vty_logp_cmd_str contains 260 bytes in 1 blocks (ref 0) 0x559c7231ba00 vty_log_level_doc_str contains 1170 bytes in 1 blocks (ref 0) 0x559c722ff430 vty_log_level_cmd_str contains 236 bytes in 1 blocks (ref 0) 0x559c722ff2d0 vty_log_level_doc_str contains 1305 bytes in 1 blocks (ref 0) 0x559c722fc610 vty_log_level_cmd_str contains 257 bytes in 1 blocks (ref 0) 0x559c722fc4a0 struct log_target contains 330 bytes in 3 blocks (ref 0) 0x559c7220c550 struct osmo_wqueue contains 96 bytes in 1 blocks (ref 0) 0x7ff689ff4090 struct log_category contains 74 bytes in 1 blocks (ref 0) 0x559c722c6290 struct log_info contains 1261 bytes in 3 blocks (ref 0) 0x559c722ac370 uint8_t contains 37 bytes in 1 blocks (ref 0) 0x559c722c6350 struct log_info_cat contains 1184 bytes in 1 blocks (ref 0) 0x559c722c5d80 struct trx_ctx contains 1021 bytes in 8 blocks (ref 0) 0x559c722a0e80 127.0.0.1 contains 10 bytes in 1 blocks (ref 0) 0x559c722c5c20 127.0.0.1 contains 10 bytes in 1 blocks (ref 0) 0x559c722c5ba0 struct cmd_element contains 122 bytes in 2 blocks (ref 0) 0x559c72369030 logging level lms (debug|info|notice|error|fatal) contains 50 bytes in 1 blocks (ref 0) 0x559c7236c1a0 utils.c:386 contains 405 bytes in 1 blocks (ref 0) 0x559c7225e5b0 utils.c:386 contains 65 bytes in 1 blocks (ref 0) 0x559c723524f0 contains 1 bytes in 1 blocks (ref 0) msgb contains 0 bytes in 1 blocks (ref 0) On the BTS side I see several messages of missed timers, but this is something I see also when I don't have the USB plugged in: <0006> scheduler_trx.c:489 GSM clock started, waiting for clock indications <0006> scheduler_trx.c:578 GSM clock skew: old fn=0, new fn=2555007 <0006> scheduler_trx.c:428 FN timer expire_count=4: We missed 3 timers <0006> scheduler_trx.c:606 We were 1 FN slower than TRX, compensated <0006> scheduler_trx.c:606 We were 1 FN slower than TRX, compensated <0006> scheduler_trx.c:428 FN timer expire_count=6: We missed 5 timers <0006> scheduler_trx.c:593 We were 1 FN faster than TRX, compensating <0006> scheduler_trx.c:606 We were 1 FN slower than TRX, compensated <0006> scheduler_trx.c:593 We were 1 FN faster than TRX, compensating <0006> scheduler_trx.c:606 We were 2 FN slower than TRX, compensated <0006> scheduler_trx.c:428 FN timer expire_count=7: We missed 6 timers <0006> scheduler_trx.c:593 We were 1 FN faster than TRX, compensating <0006> scheduler_trx.c:606 We were 1 FN slower than TRX, compensated <0006> scheduler_trx.c:593 We were 1 FN faster than TRX, compensating <0006> scheduler_trx.c:606 We were 1 FN slower than TRX, compensated <0006> scheduler_trx.c:428 FN timer expire_count=7: We missed 6 timers <0006> scheduler_trx.c:593 We were 1 FN faster than TRX, compensating <0006> scheduler_trx.c:606 We were 1 FN slower than TRX, compensated <0006> scheduler_trx.c:428 FN timer expire_count=7: We missed 6 timers <0006> scheduler_trx.c:435 No more clock from transceiver Does anyone know if this is a software or hardware problem? I am thinking maybe it is related to the power supply of the USB port, but I have no idea. I really need to have both devices connected at the same time. Any help or suggestion is appreciated, Jonathan

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How to Effectively Prepare for the Oracle 1Z0-1127-25 Exam in Minimal Time
by mahmad.iworks＠gmail.com 12 Feb '26

12 Feb '26

Facing a certification exam can feel daunting, especially when time is short. The Oracle 1Z0-1127-25 exam tests a wide range of skills and concepts, requiring both conceptual understanding and practical application. However, with a structured approach, you can study efficiently and make the most of your available time. A good first step is to familiarize yourself with the official exam objectives. Oracle provides a detailed outline of the topics and skills assessed in the 1Z0-1127-25 exam. Breaking the syllabus into smaller, manageable sections allows you to prioritize areas that need the most attention. Start with high-weightage topics and ensure you have a strong understanding of core concepts before moving on to the more advanced material. Next, combine different study resources for a balanced approach. Textbooks, official documentation, and online tutorials are essential for conceptual clarity, but incorporating practice materials is equally important. Many candidates find Oracle <a href="https://www.pass4future.com/oracle/exam/1z0-1127-25">1Z0-1127-25 Exam dumps</a> helpful for familiarizing themselves with question patterns and time management. While these dumps should never replace proper study, they can highlight commonly tested areas and help simulate real exam conditions. Active learning techniques can also save time and improve retention. Creating quick notes, flashcards, or mind maps for complex topics allows for rapid revision. Additionally, scheduling short, focused study sessions, rather than long, unfocused hours, can boost concentration and prevent burnout. Finally, practice consistently. Even in minimal time, attempting mock tests regularly helps track progress, identify weak spots, and build confidence. Review mistakes carefully to ensure you don’t repeat them in the actual exam. By combining clear planning, strategic use of resources like Oracle 1Z0-1127-25 Exam dumps, and consistent practice, it is possible to prepare effectively even with limited time. Remember, the quality of study often outweighs quantity.

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Video Recordings of OsmoCon 2017
by Harald Welte 09 Feb '26

09 Feb '26

Hi all, the Osmocom Conference 2017 last week was an overwhelming success. We received lots of positive feedback from all sides. Thanks to all the speakers, to the attendees as well as to the anonymous sponsor of the travel grant funds. It is my great pleasure that due to the great support by C3VOC (The CCC Video Operation Center), we have full recordings of all talks given at OsmoCon 2017. You can find the videos on the C3VOC site at https://media.ccc.de/search/?q=osmocon They are also linked individually from the OsmoCon 2017 homepage at https://osmocom.org/projects/osmo-dev-con/wiki/OsmoCon2017 I hope the video recordings will be of help for everyone who could not make it to the event in person. We will also be collecting the slides and put them up on the wiki during the next few days. Please don't hesitate to raise any feedback and/or questions. Technical feedback/questions regarding Osmocom software / projects should be addressed to the appropriate mailing lists, such as openbsc(a)lists.osmocom.org. Feedback to the organizers should be sent to osmocon2017(a)sysmocom.de. Looking forward to the next OsmoCon, which we'll expect to be spanning ore than just a single day. Regards, 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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Brazilian Knots Salon
by Amelia Emery 05 Feb '26

05 Feb '26

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GPRS - local and foreign TLLIs
by Luca Melette 04 Feb '26

04 Feb '26

Hello everybody, after setting up a nanoBTS with OpenBSC/SGSN/GGSN, I had some troubles trying to connect my smartphone to the GPRS cell. Investigating the BTS-to-SGSN traffic, I saw that the frames sent by the SGSN were all marked with the same N(U) value (at LLC layer), the value was 0. With some debug, I found that the there was a mismatch in the TLLI storage, used to keep the status of attached terminals. The mentioned code is contained in gprs_llc.c, involving LL Entity functions and gprs_llc_tx_ui(). /* look-up or create the LL Entity for this (TLLI, SAPI) tuple */ lle = lle_by_tlli_sapi(msgb_tlli(msg), sapi); if (!lle) { struct gprs_llc_llme *llme; LOGP(DLLC, LOGL_ERROR, "LLC TX: unknown TLLI 0x%08x, " "creating LLME on the fly\n", msgb_tlli(msg)); llme = llme_alloc(msgb_tlli(msg)); lle = &llme->lle[sapi]; } The TX function uses the previously received TLLI to lookup for the LLE. The lle_by_tlli_sapi() performs the search, but preliminary it applies a foreign2local TLLI conversion to ensure to have a local one. Since no valid entry for the searched TLLI is found, a new one is created. And the problem is here. The new entry has the foreign TLLI. Next time the lookup fails again, and a new entry is created. This way, the counter N(U) is always reset, and the mobile do not recognize the message sequence and no attach is possible. My question is about foreign and local TLLIs. I patched the lookup, avoiding the conversion, so that the LLE is found and everything works fine... but... What is the sense of the conversion? Should the TLLI be always stored as a local one? Can this problem be solved with another foreign2local while allocating new entries? Actually, my problem has been solved with that workaround. But I'm curious to know what is the right way. Hope somebody can answer :) Thanks. Cheers, LM

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