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4276 discussions

Patches and Packaging for Erlang Components
by Matthew Johnson 25 Aug '20

25 Aug '20

Hello! I was able to use the experimental osmo_dia2gsup converter to successfully enable circuit switched fallback in a test network, but have a couple fixes for it and osmo_ss7 needed to work with the latest 2G CN components. I would open a change request in gerrit, but I see that the rebar.conf of osmo_dia2gsup already depends on a WIP branch from osmo_ss7. How best should I provide patches for review? Is there ongoing work in http://git.osmocom.org/erlang/osmo_ss7/log/?h=laforge/wip that needs to be merged first, and is there a reason it has not been merged already? Otherwise should I open a change request towards the WIP branch? Also, do folks have any opinions on how best to package erlang components? I was going to generate a Debian package for a stand-alone erlang “release” of osmo_dia2gsup, and am happy to contribute the debian metadata and build files upstream, but I am not an erlang expert and want to make sure it’s structured in the correct way if there is a convention I should follow. >From a random sample it looks like none of the other erlang components are packaged, so I don’t have a good example to go from. If there is no opinion I will make an attempt, but I wanted to ask first! Thanks for your help and patience! -Matt J.

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openBSC with commercial BTS
by Ivan Babanov 24 Aug '20

24 Aug '20

Hello, I see that currently openBSC/osmoBSC works with a number of old commercial BTS such as Ericsson/Nokia/Siemens etc. It works over E1/Abis. My question is, did somebody try something newer than Nokia UltraSite? I have an ability to try with FlexiBTS rel.3 with Abis over IP. I'm trying to find out if maybe it was already tried and had some unresolveable problems? Please let me know if any. Thank you Ivan

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Support for new SDR devices
by Xaver Zu 17 Aug '20

17 Aug '20

Hi all, What are the plans to expand support for new SDR devices? When I check the contents of osmo-trx/Transceiver52M/device/ on the git master I see the supported lms, uhd and usrp1 devices. For example the XTRX SDR was presented at OsmoDevCon 2018. I expected it to be included in the master soon. At this point I see its addition in the fairwaves / libxtrx-wip branch from 2018. That doesn't give me much encouragement for my next question. Would it be possible to add support for PCIe SDR from Amarisoft? Some information about SDR is here https://discourse.myriadrf.org/t/amarisoft-sdr-integration-with-oai/2288 Based on the https://media.ccc.de/v/osmocon2018-82-osmotrx-status-support-for-more-drive… I tried to create support by myself. I've gotten into a state that some MS with weak requirements for signal quality and timing can connect. My branch is here https://github.com/XK1ZU/osmo-trx/tree/PCIeSDR-LMSstyle gr-osmosdr support is here https://github.com/XK1ZU/gr-osmosdr/commits/PCIeSDR This osmo-trx is able to run for a few tens of seconds then it quits and I have to restart it, so I would need a deeper understanding of the timing and scheduling of processes within osmo-trx. Who should be a clock master SW stack or SDR device? I see a lot of log error messages as 0000> Transceiver.cpp:422 [tid=140137319651072][chan=0] dumping STALE burst in TRX->SDR interface (1:1408722 vs 7:1408723), retrans=0 <0000> Transceiver.cpp:1122 [tid=140137311258368] ClockInterface: sending IND CLOCK 1408899 or 0000> Transceiver.cpp:280 [tid=140137328043776] Starting the transceiver <0000> radioInterface.cpp:181 [tid=140137328043776] Starting radio device <0000> PCIESDRDevice.cpp:199 [tid=140137328043776] PCIESDRDevice::start <0000> PCIESDRDevice.cpp:205 [tid=140137328043776] starting PCIeSDR..., sample rate:1.08333e+06 <0000> PCIESDRDevice.cpp:234 [tid=140137328043776] PCIESDRDevice::flush <0000> PCIESDRDevice.cpp:219 [tid=140137328043776] msdr_start ok: <0000> PCIESDRDevice.cpp:532 [tid=140137328043776] Update Alignment <0000> PCIESDRDevice.cpp:532 [tid=140137328043776] Update Alignment <0000> radioInterface.cpp:202 [tid=140137328043776] Radio started <0000> Threads.cpp:119 [tid=140137294472960] Thread 140137294472960 (task 18522) set name: TxLower <0000> Threads.cpp:119 [tid=140137311258368] Thread 140137311258368 (task 18524) set name: RxUpper0 <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP POWERON 0' <0000> Threads.cpp:119 [tid=140137302865664] Thread 140137302865664 (task 18523) set name: RxLower <0002> PCIESDRDevice.cpp:363 [tid=140137302865664] rc < 0 <0002> PCIESDRDevice.cpp:364 [tid=140137302865664] Sample buffer: Requested timestamp is not valid <0000> Threads.cpp:119 [tid=140137319651072] Thread 140137319651072 (task 18525) set name: TxUpper0 <0002> PCIESDRDevice.cpp:365 [tid=140137302865664] timestamp = 10960, length = 262144, time_start = 6765960, time_end = 6766960, data_start = 223320, data_end = 224320 <0002> PCIESDRDevice.cpp:482 [tid=140137294472960] tx_underflow_count:3 rx_overflow_count:0 <0002> PCIESDRDevice.cpp:491 [tid=140137294472960] PCIeSDR: tx underrun ts_tmp:10976 ts:10960 hwts:6762040 <0000> radioInterface.cpp:334 [tid=140137302865664] Receive error 0 <0000> Transceiver.cpp:1162 [tid=140137302865664] Something went wrong in thread RxLower, requesting stop <0002> PCIESDRDevice.cpp:482 [tid=140137294472960] tx_underflow_count:4 rx_overflow_count:0 <0002> PCIESDRDevice.cpp:491 [tid=140137294472960] PCIeSDR: tx underrun ts_tmp:13476 ts:13460 hwts:6762278 <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETRXGAIN 40' <0000> PCIESDRDevice.cpp:318 [tid=140137328043776] Setting RX gain to 40 dB. <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETRXGAIN 0 40' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETPOWER 0' <0000> PCIESDRDevice.cpp:297 [tid=140137328043776] Setting TX gain to 60 dB. device:0x1f6e0e0 chan:0 <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETPOWER 0 0' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 0 5' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 0 5' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 1 7' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 1 7' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 2 13' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 2 13' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 3 13' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 3 13' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 4 13' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 4 13' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 5 8' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 5 8' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 6 8' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 6 8' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 5 13' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 5 13' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 7 13' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 7 13' <0001> Transceiver.cpp:778 [tid=140137328043776][chan=0] command is 'SETSLOT 6 13' <0001> Transceiver.cpp:923 [tid=140137328043776][chan=0] response is 'RSP SETSLOT 0 6 13' <0000> osmo-trx.cpp:485 [tid=140137400406720] Shutting down transceiver... <0000> Transceiver.cpp:338 [tid=140137400406720] Stopping the transceiver <0000> Transceiver.cpp:351 [tid=140137400406720] Stopping the device <0000> PCIESDRDevice.cpp:254 [tid=140137400406720] PCIESDRDevice::stop <0000> PCIESDRDevice.cpp:261 [tid=140137400406720] PCIESDR stopped <0000> Transceiver.cpp:364 [tid=140137400406720] Transceiver stopped <0000> PCIESDRDevice.cpp:78 [tid=140137400406720] Closing PCIESDR Device Yours XK1Zu

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Re: osmo-mslookup-client.c
by Neels Hofmeyr 13 Aug '20

13 Aug '20

Hi Edgard, thanks for your interest in the Osmocom project. On Sat, Aug 08, 2020 at 08:56:08PM +0100, Edgard Ndassimba wrote: > I have difficulte to implemente osmo-mslookup-client.c I'm sorry, I don't understand the question... I looked, and I notice that osmo-mslookup-client is missing from the binary packages. I opened a bug tracker for it: https://osmocom.org/issues/4706 If you want to use osmo-mslookup-client, you need to build osmo-hlr manually. For that, please look at https://osmocom.org/projects/cellular-infrastructure/wiki/Build_from_Source MSLookup and DGSM are explained in http://ftp.osmocom.org/docs/latest/osmohlr-usermanual.pdf chapter "12 Distributed GSM / Multicast MS Lookup" If you have more questions about this, please write an email to openbsc(a)lists.osmocom.org or ask on IRC: FreeNode #osmocom Please write to the mailing list, and not to me personally. That way you have more people that can help you, and more people can learn from your progress. Thanks! ~N > > I use ubuntu 16.04 LTS amd64 > > Could you help me please? > > Best Regards > > -- > Edgard NDASSIMBA

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ttcn3-bsc-test-latest status
by Neels Hofmeyr 13 Aug '20

13 Aug '20

I recently broke ttcn3-bsc-test-latest for a couple of builds, which is fixed now. Still it appears like some 'latest' tests remain damaged, but that is actually not the case. Here a summary of those that look like failures but are expected: TC_chan_rel_rr_cause: the test is new and tests a feature not implemented in 'latest' yet. TC_chan_rqd_emerg_deny: the test is new and I'm not sure of its 'latest' status. TC_si2quater_2_earfcns, TC_si2quater_3_earfcns: osmo-ttcn3-hacks just now merged a patch that also tests EARFCN presence in a Channel Release message. Since 'latest' still has a bug that causes only the first EARFCN to appear in that message, these two tests now fail in 'latest'. TC_cbsp_emerg_write_bts_cgi_cchan: This used to fail, then during the massive failures it suddenly passed for a bit, and now fails again. The passes must have been flukes. ~N

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build trigger thunder cloud
by Neels Hofmeyr 12 Aug '20

12 Aug '20

Today I noticed that osmo-msc-master was being built several times in a row and I found there are multiple redundant ricocheting downstream builds of the same original upstream build timer. All of: https://jenkins.osmocom.org/jenkins/job/master-osmo-msc/18894/ https://jenkins.osmocom.org/jenkins/job/master-osmo-msc/18895/ https://jenkins.osmocom.org/jenkins/job/master-osmo-msc/18896/ show: Started by upstream project master-libosmocore build number 1624 And then there are: https://jenkins.osmocom.org/jenkins/job/master-osmo-msc/18897/ https://jenkins.osmocom.org/jenkins/job/master-osmo-msc/18898/ showing: Started by upstream project master-libosmo-abis build number 2611 So there are two timers launching master-libosmocore and launching master-libosmo-abis, and each of these cause multiple downstream build triggers of osmo-msc. Then there is also the osmo-msc timer, independently launching more nightly master-osmo-msc builds. It is not necessary to depend these builds on each other, because none of them depends on artifacts built in another job, each of them in turn builds the entire chain of libosmocore up to that build's target project. Upon a libosmocore *code change*, it makes sense to trigger downstream builds, but not when caused by a timer or for other jenkins trigger or user reasons. I vaguely remember discussing this before, but now I realize we could solve this and have less redundant builds: Do not configure libosmocore to trigger downstream builds of master-libosmo-abis (and so on), but instead trigger master-libosmo-abis upon each libosmocore patch merge. That can be done by adding a "Gerrit trigger" on the master-libosmo-abis build job config, making a patch-merge to the gerrit libosmocore.git cause a master-libosmo-abis build. At that point, jenkins timers no longer cause downstream builds, but merges to master on upstream git repositories do still cause builds. (maybe there is also a normal git SCM way that doesn't require gerrit.osmocom.org?) For projects like osmo-msc, we would add multiple projects as upstream git repositories, like libosmocore, libosmo-abis, libosmo-netif, ... , osmo-iuh, osmo-mgw, ... Basically all of the projects with more than one dependency get retriggered redundantly every night, some doing their entire build matrix over several times for no good reason. I'm not sure that it's really worth the effort, but I thought I'd mention it since seeing so many redundant builds on various osmo source trees at night seems avoidable stupidity. Should someone spend cycles to implement this? ~N

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osmo-bts-trx + osmo-trx: dummy burst filling
by Vadim Yanitskiy 02 Aug '20

02 Aug '20

Hi all, as some of you may know, I am currently working on baseband frequency hopping implementation for osmo-bts-trx (see OS#4546). I've already submitted more or less final implementation to Gerrit [1], and in general it works fine [2]. The idea is quite simple: you have several RF carriers (transceivers) with fixed frequencies, so on hopping timeslots osmo-bts-trx distributes bursts between them according to the configured hopping sequence. However, when it comes to hopping timeslots on C0, the burst distribution algorithm gets a bit more complicated. The problem is that on C0 the BTS has to maintain constant power level, even if there is nothing to transmit, so the phones can detect it reliably during the power scan. This is achieved by sending dummy bursts. When frequency hopping is not in use, the scheduler in osmo-bts-trx sends a dummy burst immediately. When it is in use, sending dummy bursts needs to be postponed until all transceivers are processed, because some other transceiver might need to send a normal burst on the frequency of C0, and there would be no need to send a dummy burst in that case. So I came up with [3] (any comments regarding potential optimizations and further improvements are welcome). While working on this, I stumbled upon the burst filling feature in osmo-trx [4], that is disabled by default. If enabled, osmo-trx would be sending dummy bursts itself, so there is no need to send them from osmo-bts-trx, and thus no need to complicate the burst distribution logic. I am now wondering why don't we enable this feature by default? From the VTY reference: > Send a dummy burst when there is nothing to send on C0 (TRX0) and > empty burst on other channels. Use for OpenBTS compatibility only, > don’t use with OsmoBTS as it breaks encryption. it's unclear how sending dummy bursts would break encryption... [1] https://gerrit.osmocom.org/c/osmo-bts/+/19030 [2] https://www.youtube.com/watch?v=tGMVNYo9s7E [3] https://gerrit.osmocom.org/c/osmo-bts/+/19029 [4] http://ftp.osmocom.org/docs/latest/osmotrx-vty-reference.pdf#subsection.1.9… Best regards, Vadim. -- - Vadim Yanitskiy <vyanitskiy at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte

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libosmocore / osmo_fd / select() / performance
by Harald Welte 21 Jul '20

21 Jul '20

Hi all, it has been coming up in at least two contexts recently: Select is showing up a lot in system-level profiles particularly on osmo-bts. This is hardly surprising, as select() is not particularly known for efficiency. It was used back in 2008 for the *BSC*, in a context where we were talking about 1-10 BTS with each no more than 1-2 TRX. Now we are using the same osmo_fd abstraction on the BTS, where the number of messages per second is much higher, particularly in osmo-bts-trx with its TRXD protocol, and particularly with higher number of TRX per BTS. There is an older feature request to introduce epoll support in https://osmocom.org/issues/1579 but unfortunately nobody has been finding the resources and/or time to implement it. Meanwhile, 1.5 years ago, the Linux kernel received a new sub-system called io_uring, which I would personally love to support. Here are some pointers for those who are interested: https://lwn.net/Articles/776703/ https://kernel.dk/io_uring.pdf https://lwn.net/Kernel/Index/#io_uring As unfortunately not everyone is using half-way recent kernels, we will likely have to fall back to epoll or something like that. Regards, Harald -- - Harald Welte <laforge(a)osmocom.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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Osmocom scheduled outage on *2020-07-19 9am CEST*
by Harald Welte 19 Jul '20

19 Jul '20

There is an urgent need to migrate our most important public infrastructure to a new server, and I will be doing that on *Sunday, July 19 2020*, starting about 9am CEST. The migration involves redmine (main osmocom.org website), jenkins, gerrit, git, and cgit. In theory, the migration should be quick. I would expect (significantly) less than one hour of downtime. However, we all know Murphys law. Services not affected are mail (including mailman lists), ftp, dns. So in case of doubt, we can still use mailing lists to communicate. In case anyone urgently needs osmocom source code on Sunday morning during the downtime: There are public mirrors available on github. Regards, Harald -- - Harald Welte <laforge(a)osmocom.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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OsmoCBC Status?
by Nick Jones 05 Jul '20

05 Jul '20

Hi all, Just wondering what the status of OsmoCBC is? I started compiling from source, but I couldn't find any docs on interfacing with it other than that it's via a HTTP REST API, If there aren't any docs are there packet captures or examples I can work from that'd be quicker than trying to reverse it from the source code, Happy to contribute some docs once I work it out, Cheers, Nick

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