OpenBSC August 2020

openbsc@lists.osmocom.org

9 participants
11 discussions

by mosbah abdelkader

> I don't understand. This callback will be called with data you need to write > to the network. In case of MTP Level3 you will need to wrap that around the > msgb you got. I means: is the interaction with mtp3 layer implemented (is sending sccp data by mtp3 implemented by the library?)? Also, what about the reception of data from mtp3 layer. is that implemented in the sccp lib. I am asking these questions because I see the code of mtp3 in the lib but no significant call is present in the sccp part of the lib. Thank you for your help.

1 month

dynamic traffic channels

by Neels Hofmeyr

On Tue, Jun 28, 2016 at 10:05:28AM +0200, Harald Welte wrote: > [translated from german] > is it certain that we switch a channel to PDCH only when > gprs mode != none? A TS can be GSM_PCHAN_TCH_F_PDCH; those are the only ones for which we send a PDCH ACT message. We send a PDCH ACT message - during init (CHANNEL OML's state changed to enabled -> send PDCH ACT), - and upon channel release ack when pchan == GSM_PCHAN_TCH_F_PDCH. So the question is, when we receive a channel release ack, could that be the PDCH release and we switch PDCH right back on by accident? No, because we only receive a chan rel ack when the *TCH/F* is being released. That is because the PDCH release is initiated "internally" from the PDCH DEACT, and thus this condition in common/rsl.c rsl_tx_rf_rel_ack() catches on, which existed before dyn PDCH: if (lchan->rel_act_kind != LCHAN_REL_ACT_RSL) { LOGP(DRSL, LOGL_NOTICE, "%s not sending REL ACK\n", gsm_lchan_name(lchan)); return 0; } In rsl_rx_rf_chan_rel() the rel_act_kind is set to LCHAN_REL_ACT_RSL, but not in the rsl_rx_dyn_pdch(). This is analogous to the ip.access way -- the ip.access nanobts replies to a PDCH DEACT with a PDCH DEACT ACK and doesn't send a separate channel release ack. Maybe we could set rel_act_kind to some new LCHAN_REL_ACT_IPAC_DYN_PDCH for clarity? (But we shouldn't actually send a release ack, to stay compatible.) Even though it works as-is, we should indeed add another flag check: - We do check the flags that no ACT/DEACT is already pending; - And we do send a PDCH DEACT only if ts->flags & TS_F_PDCH_ACTIVE; - But we would send a PDCH ACT despite ts->flags & TS_F_PDCH_ACTIVE. This should never happen, but it would make sense to ensure that. ~Neels

1 month

Problem while running NIB on Open Cellular Base sation

by Brackley Casinga

Hi, My name is Brackley Cassinga Form DRC, we run a community network called pamoja net where we offer gsm services using osmocom open source software and OC Base station. Recently I have tried to install another base station as the same installed but I could not find any resource guiding through all the steps to take to run NIB on a base station. I'm currently running Ubuntu and I will appreciate if you could guide me on the installation of BSC,hlr,MSC , in order to run a basic gsm network. Thank you. Regards -- *Ir Brackley heshima Casinga **Pacifique* *CEO and Founder of kwanzatechnologie* KwanzaTechnologies ,GlobalElectronics +243977265291 | +243977265291 | Pcassinga(a)gmail.com/ brackley(a)ensemblepourladifference.org www.kwantechnologies.jimdosite.com <http://www.kwantechnologies.com/> | Skype: Brackley cassinga <https://webapp.wisestamp.com/#> Av Semliki N 43

1 year, 4 months

Re: New Defects reported by Coverity Scan for Osmocom

by nhofmeyr＠sysmocom.de

On Tue, Aug 25, 2020 at 02:49:39AM +0000, scan-admin(a)coverity.com wrote: > *** CID 212862: Error handling issues (CHECKED_RETURN) > /source-Osmocom/osmo-pcu/src/pdch.cpp: 211 in gprs_rlcmac_pdch::packet_paging_request()() > 205 > 206 /* loop until message is full */ > 207 while (pag) { > 208 if (log_check_level(DRLCMAC, LOGL_DEBUG)) { > 209 struct osmo_mobile_identity omi = {}; > 210 char str[64]; > >>> CID 212862: Error handling issues (CHECKED_RETURN) > >>> Calling "osmo_mobile_identity_decode" without checking return value (as is done elsewhere 20 out of 22 times). > 211 osmo_mobile_identity_decode(&omi, pag->identity_lv + 1, pag->identity_lv[0], true); > 212 osmo_mobile_identity_to_str_buf(str, sizeof(str), &omi); > 213 LOGP(DRLCMAC, LOGL_DEBUG, "Paging MI - %s\n", str); > 214 } I'd like to let you guys know that I intentionally don't check the return value here. This is only for logging the mobile identity, and if decoding fails, the logging should just show "NONE". ~N

4 years, 10 months

Patches and Packaging for Erlang Components

by Matthew Johnson

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.

4 years, 10 months

openBSC with commercial BTS

by Ivan Babanov

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

4 years, 10 months

Support for new SDR devices

by Xaver Zu

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

4 years, 10 months

Re: osmo-mslookup-client.c

by Neels Hofmeyr

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

4 years, 10 months

ttcn3-bsc-test-latest status

by Neels Hofmeyr

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

4 years, 10 months

build trigger thunder cloud

by Neels Hofmeyr

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

4 years, 10 months

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OpenBSC August 2020