OpenBSC September 2022

openbsc@lists.osmocom.org

10 participants
14 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.

2 weeks, 6 days

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

3 weeks, 3 days

cmd2 update causing pySim-shell to fail

by bryan coxwell

Hi all, Just wanted to share an issue and a quick workaround I found for it in case anyone else has the same problem. I believe a cmd2 update is causing pySim-shell to fail. After installing it on a fresh install of Ubuntu Server 20.04 and getting the following error when I run "python3 pySim-shell -p0": >Using PC/SC reader interface >Autodetected card type: sysmoUSIM-SJS1 >AIDs on card: > USIM: a0000000871002ffffffff8907090000 >Traceback (most recent call last): > File "pySim-shell.py", line 512, in <module> > app = PysimApp(card, rs, opts.script) > File "pySim-shell.py", line 59, in __init__ > super().__init__(persistent_history_file='~/.pysim_shell_history', allow_cli_args=False, use_ipython=True, auto_load_commands=False, command_sets=basic_commands, >startup_script=script) >TypeError: __init__() got an unexpected keyword argument 'use_ipython' If you run into this you can fix it by uninstalling cmd2 and reinstalling cmd2 with "pip3 install cmd2==1.5". Best, Bryan

1 year, 3 months

libosmocore/BSC/MSC: MO voice calls rejected from Siemens S11E (patch included)

by Lennart Müller

Hi, I had a problem placing MO GSM calls from a Siemens S11E: The calls were dropped immediately; Osmo-MSC reports "Cannot compose Channel Type from bearer capabilities" After investigating the SETUP request from the S11E, the phone does not use octet 3a (no extension bit set in IE 3). Wireshark decodes the radio channel requirement as "Full rate support only MS/fullrate speech version 1 supported", so I added a condition to the gsm48_ie.c function of libosmocore to include at least GSM FR in the list of available speech_ver in case octet 3 has no extension. Attached to this message are the Abis-IP PCAP traces of MO calls, and the patch for gsm48_ie.c. Regards, Lennart

1 year, 4 months

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

Osmo-BTS tx-attenuation

by Justin Mark Repollo

Hi Osmocom Community, May I ask your help on this. We have a test setup with UmTrx 2.3.2 SDR. We are trying to set the tx-attenuation and measure the power output but it seems it doesn't reflect based on the defined configurations. We tried to set 0, 5, 10 as values and below are the results. [image: 0-02-03-588e9973ceef2e018e29c0b2eb576f5b7d26972bbb779b44f79c97408d360299_1c6daee34bf8ee.jpg] [image: 0-02-06-99d6d7ce8551b10be62ea130c638b19c5475b5b4140bf2843b92a5b55d36c67c_1c6daee34bfeec.jpg] Please see attached files for osmo configurations and logs. Thanks! Regards, Justin

2 years, 7 months

osmo-gsm-tester: Issue with osmo-gsm-tester-runner Jenkins job

by Callum Snowden

Hi all, We're trying to setup osmo-gsm-tester on bare metal and are currently experiencing issues with the Jenkins job 'osmo-gsm-tester-runner'. All of our test machines are running Ubuntu Server 20.04 and have been setup following the latest available manual from https://downloads.osmocom.org/docs/latest/osmo-gsm-tester-manual.pdf. We've trying to use the '4g_srsLTE' example from https://github.com/osmocom/osmo-gsm-tester/tree/master/doc/examples/4g_srsL… but when trying to run the 'ping' test the following error is returned in the Jenkins console output: " 14:07:52.867022 run mk-remote-dir(pid=2480): ERR: Terminated: ERROR {rc=1} [trial-21↪4g:srsenb-rftype@soapy↪ping.py:9↪ping.py↪srsepc_10.100.100.113↪host-jenkins@10.100.100.113↪mk-remote-dir(pid=2480)] 14:07:53.015620 run mk-remote-dir(pid=2480): stdout: | (launched: 2022-09-23_14:07:51.598612) | mkdir: cannot create directory ‘/osmo-gsm-tester-srsepc’: Permission denied " It appears that osmo-gsm-tester is trying to create the directory 'osmo-gsm-tester-srsepc' under root, which is not permitted as the Jenkins user the script runs has does not have permissions. Additionally, it looks like this path is hard-coded in the Python module https://github.com/osmocom/osmo-gsm-tester/blob/master/src/osmo_gsm_tester/… and also the same applies for srsENB https://github.com/osmocom/osmo-gsm-tester/blob/master/src/osmo_gsm_tester/… Is this the intended behaviour? Or have we missed out steps during our bare-metal setup process? I've double-checked that the main unit can SSH into the slave unit without a password so that's not the issue causing "permission denied". Best regards, Callum.

2 years, 8 months

osmo-gsm-tester: Issue with osmo-gsm-tester-runner Jenkins job

by Callum Snowden

2 years, 8 months

osmo-gsm-tester: Issue with osmo-gsm-tester-runner Jenkins job

by Callum Snowden

2 years, 8 months

git infrastructure

by Neels Hofmeyr

I guess it's a bit late, but do we really need categories on gitea? The simple world I would have expected: git clone https://gitea.osmocom.org/libosmo-pfcp git clone https://gitea.osmocom.org/osmo-upf The world we live in: git clone https://gitea.osmocom.org/celullar_infarsturcure/libosmo-pfcp git clone https://gitea.osmocom.org/osmocom/osmo-upf git clone https://gerrit.osmocom.org/libosmo-dsp and works: git clone git://git.osmocom.org/osmo-upf fails: git clone https://git.osmocom.org/osmo-upf works: git clone https://git.osmocom.org/libosmo-pfcp While I'm at it: do we have a designated primary git place for Osmocom? De facto the answer seems to be: gerrit, except when it's not on gerrit. Because of the above issues, currently there is a wave of patches rolling out which edit build scripts and READMEs to change git URLs -- it feels wrong that this is necessary. It seems the topic needs some clarification, and maybe it is still possible to simplify the git structures? - remove the layer of categories from gitea? - move gitea/cellular-infrastraucute/* to gitea/osmocom/* ? - point git.osmocom.org at gitea.osmocom.org/osmocom/ ? (cgit.osmocom.org still works) - keep cgit as the primary git place, gitea as users' playgrounds? (not sure if possible or good ideas) ~N

2 years, 8 months

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OpenBSC September 2022