OpenBSC February 2026

openbsc@lists.osmocom.org

16 participants
28 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

I’ve been struggling with my CompTIA exam prep and honestly, it's been hard to manage everything. The idea of asking someone to take my online CompTIA exam for me https://www.theresearchguardian.com/take-my-comptia-exam-for-me/ seemed a bit extreme at first, but after seeing how many students do it, I’m starting to consider it seriously. If anyone has tried this service, I’d love to hear your thoughts. Was it worth the investment? How reliable were the test takers? I just want to make sure I'm making the right choice.

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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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Plagiarism Detection Tools: A Helping Hand for Students
by thomasemily11399＠gmail.com 03 Apr '26

03 Apr '26

Plagiarism detection tools are invaluable resources for students, ensuring academic integrity in their work. These tools help identify unoriginal content, allowing students to avoid unintentional plagiarism and maintain credibility in their assignments. By scanning essays, research papers, and projects against vast databases, these tools highlight any similarities with existing sources, providing students with the opportunity to revise their work before submission. For students struggling with citations or paraphrasing, plagiarism checkers act as a safety net, ensuring proper attribution of sources. Additionally, platforms like My Assignment Help offer guidance on how to use these tools effectively, helping students refine their writing while improving their research skills. Using plagiarism detection tools not only ensures compliance with academic standards but also boosts the student’s confidence in submitting original, well-crafted work. This proactive approach fosters learning and academic growth, providing a solid foundation for future success. Visit Us : https://baddiehub.org.uk/plagiarism-detection-tools-a-helping-hand-for-stud…

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

31 Mar '26

Artvigil in Australia is a popular nootropic medication known for promoting wakefulness and mental alertness. Containing Armodafinil, it is often prescribed to manage sleep disorders such as narcolepsy, shift work sleep disorder, and obstructive sleep apnea. Many professionals and students also use Artvigil to improve focus, productivity, and cognitive performance. Available through reputable online pharmacies, Artvigil offers a reliable alternative to Modafinil with longer-lasting effects. Australians seeking a safe and effective way to stay alert can buy Artvigil online after consulting a healthcare professional to ensure proper dosage and safe usage- https://www.healthmatter.co/product/artvigil-150/

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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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Conquer the Infinite Descent: A Deep Dive into the Addictive World of Slope Game
by yappiest.orca.nuew＠hidingmail.com 27 Feb '26

27 Feb '26

Are you ready for a challenge that will test your reflexes, push your focus to the limit, and keep you coming back for just one more try? Then buckle up, because we're diving headfirst into the thrilling, neon-lit world of Slope Game! https://slopegamefree.com/ This deceptively simple, yet incredibly addictive, online game has captivated players worldwide with its fast-paced gameplay and unforgiving difficulty. Forget complex storylines and intricate character designs, Slope Game strips gaming down to its purest essence: skill, precision, and a whole lot of persistence. What is Slope Game? A Neon-Fueled Rollercoaster of Skill Slope Game is a minimalist 3D endless runner where you control a ball careening down a series of randomly generated slopes. The objective? Simple: survive for as long as possible. Avoid obstacles, maintain your speed, and navigate the ever-changing landscape without falling off the edge. Sounds easy, right? Think again! Developed by RobKay Games, Slope Game was first released in 2014 and quickly gained popularity due to its addictive nature and accessibility. Its simple premise, coupled with its challenging gameplay, makes it a perfect pick-up-and-play game that can be enjoyed in short bursts or lengthy sessions. Pro Tips and Tricks to Dominate the Slopes Want to improve your Slope Game skills and climb the leaderboard? Here are some essential tips and tricks to help you become a rolling master: Focus on Precision: Small, controlled movements are key. Avoid jerky or excessive steering. Anticipate the Terrain: Scan ahead and try to predict the upcoming path. Reacting quickly is important, but anticipation is even better. Use the Edges: Briefly riding the edge of the slope can help you navigate tight corners and avoid obstacles. Practice Makes Perfect: The more you play, the better you'll become at judging distances and timing your movements. Don’t get discouraged by early failures. Find Your Rhythm: Develop a sense of rhythm and timing that works for you. This will help you maintain control and react more effectively to changes in speed and terrain. Don't Be Afraid to Slow Down: While maintaining momentum is important, sometimes tapping the brakes (by briefly steering in the opposite direction of your momentum) can help you navigate tricky sections. Peripheral Vision is Your Friend: Try to maintain awareness of the surrounding area, not just the immediate path in front of you. This will help you spot obstacles and react accordingly. Learn from Your Mistakes: Analyze why you crashed and try to avoid making the same mistake again. Each run is a learning opportunity. Take Breaks: If you're getting frustrated, take a break and come back later. A fresh perspective can often help you improve. Experiment with Different Strategies: There's no one "right" way to play Slope Game. Experiment with different approaches and find what works best for you. Final Verdict: A Simple Game With Enduring Appeal Slope Game is a testament to the idea that simple doesn't mean easy. Its addictive gameplay, challenging difficulty, and endless replayability make it a must-try for any fan of arcade-style games. While its repetitive nature and lack of story might not appeal to everyone, its pure, unadulterated test of skill is sure to keep you hooked for hours.

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New feature: twrtp in OsmoBTS
by Mychaela Falconia 26 Feb '26

26 Feb '26

Dear Osmocom community, There is a new feature in OsmoBTS: ability to use twrtp+twjit instead of ortp. The patches were merged to master just over 24 h ago, and should now be included in the official nightly builds for Debian-style distros and for sysmoBTS hw. The new vty setting is 'rtp library' under 'bts 0' node: if you set 'rtp library twrtp', the BTS application will use the new twrtp library to operate the RTP endpoint that goes with every TCH activated for a speech or CSD call, and it will use twjit component of twrtp for the tricky task of mapping received RTP packets to ticks of the internal fixed time base used for radio Tx - the jitter buffer function. When twrtp library is selected, the old 'rtp jitter-buffer' setting will have no effect - it is specific to the 3rd party ortp library which twrtp seeks to replace. Instead the way to configure the amount of jitter buffering (trade-off between added latency and ability to tolerate more jitter) and other twjit algorithm tunings is via the new 'twjit' vty node that appears under 'bts 0'. The algorithm used by twjit, its theoretical basis and its tunable parameters are thoroughly documented. The document source lives in libosmo-netif along with the code; a PDF rendition can be found here: https://www.freecalypso.org/TW-doc/twrtp-guide-osmo.pdf My original reasons for developing twrtp+twjit and getting this facility integrated into Osmocom were and are: 1) I tried to understand the algorithm used by ortp for the jitter buffer function, and found it resistant to understanding. I naturally seek to eliminate non-understandable black boxes from my GSM networks, hence the project was undertaken to implement a replacement library whose algorithmic design is exactly what I want for high-quality GSM networks. 2) ortp is not a simple lean library, instead it drags a long chain of further dependencies along with it, many dealing with functionality that was never used in Osmocom. This unjustified increase in the list of dependencies is a major pain point for minimalist systems/distros such as Slackware. When I embarked on this project in the Northern hemisphere summer of 2024, I assumed that everyone else in Osmocom was perfectly happy with ortp and that my networks would be the only ones using the alternative of twrtp+twjit. However, when twrtp and twjit were undergoing code review for integration into libosmo-netif, Pau indicated that others in Osmocom have also become somewhat dissatisfied with ortp external dependency, and very surprisingly to me, expressed a desire to eventually stop using ortp and use only twrtp instead. It does make sense, though: twrtp and twjit are built on top of libosmocore primitives (msgb, osmo_io etc) and specifically written for use in Osmocom environment, while ortp is non-native... However, before there can be any talk about twrtp becoming the new default or removing support for ortp, the new config of OsmoBTS using twrtp+twjit needs to be tested a lot more extensively, by more than just me, in network environments that may be very different from mine. This invitation to test twrtp in OsmoBTS is the primary purpose of the present post. For everyone who feels brave or has some spare cycles, please try setting 'rtp library twrtp' in your OsmoBTS vty config, and then test some voice (or CSD) calls in your environment. Tests in GSM networks that aren't self-contained (can do more than internal switching between an MO leg and an MT leg inside the same network) would be particularly interesting: in a self-contained Osmocom network with internal MNCC the only possible RTP path is osmo-bts -> multiple osmo-mgw packet forwarder instances -> osmo-bts, while networks with external connectivity can be much more varied. In any case, I would appreciate hearing some feedback regarding twrtp in OsmoBTS. :) Happy hacking, Mother Mychaela

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Nokia LAPD problems and renaming
by Sipos Csaba 22 Feb '26

22 Feb '26

Dear Community, We reached a bit of an challenge with the Nokia BTS support we are working on, so before I make a commit, let me explain what the problem is, hopefully someone has a better idea. The Nokia BTS does not initiate a LAPD connection for the RSL links even when the BTS finished configuring and testing the TRX units. As the support for the Nokia BTSes was mainly done on the smaller InSite units, this problem did not presented itself, as even after the TRX was reset, the recovery is so fast that it is within the LAPD timeout. But with the bigger macro variant (UltraSite), this issue is now presenting itself: after the BTS is configured via OML, we wait for the CONF_COMPL from the BTS, before we start the RSL bootstrap. Problem is that the BCCH TRX needs a RESET during the bootstrap and compared to the smaller InSite or MetroSite (both are so called "integrated TRX units"), the UltraSite TRX takes 10-15 seconds to be ready, and there is no way for us to know when this happens: no OML messages, no RSL LAPD init triggered by the BTS itself, so nothing to trigger on. And by this amount of time the RSL LAPD times out and the TRX is never bootstrapped. So at the moment the cheap hacky solution is to just increase the RSL LAPD N203 timer from 4 to 20 seconds, this way the LAPD does not timeout and all the TRXes are bootstrapped properly. Would this be acceptable for just the Nokia family? Or a configurable reset timer is more preferred, like we already have for the OML part? Please let me know your opinions. The second thing is more of a suggestion: as the existing Nokia codebase can support much more than just the *Site family (both older and newer units can be supported by the same dialect), I would suggest to rename it to "bts_nokia.c" as the name suggests only the Site family is supported. I personally did not tried it, but if anyone has access to newer (or older) units like a Flexi BTS, Flexi Multiradio and Multiradio10 (all with E1 interfaces) please let me know. Regards, Csaba

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OpenBSC February 2026