OpenBSC December 2020

openbsc@lists.osmocom.org

8 participants
20 discussions

dynamic traffic channels
by Neels Hofmeyr 20 May '25

20 May '25

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

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Problem while running NIB on Open Cellular Base sation
by Brackley Casinga 31 Jan '24

31 Jan '24

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

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Idea for 2021: Regular "OsmoDevCall"
by Harald Welte 25 Mar '21

25 Mar '21

Dear Osmocom community, as the pandemic continues and physical meetings are out of the question for the forseeable future, it would be a good idea to have a periodic virtual online meeting of the interested Osmocom community. I was thinking of a format where we would serve two major purposes: 1) technical talks about osmocom relevant topics - ideally current/recent developments * can be pre-recorded to avoid any problems with technical setup, streaming, ... * should ideally have a Q+A session at their initial "airing" during one OsmoDevCall 2) unstructured solicited social event (USSE) * random chat in audio (optionally video) * not recorded, obviously The recording of the technical presentation should then be permanently made available (like the presentations of our prior OsmoCon / OsmoDevCon). Not every OsmoDevCall would neccessarily need the two parts, but I think it would be great if we can make that happen. We could also have e.g. a two-weekly schedule for the USSE and a monthly schedule for the technical presentation. We'd need somebody to volunteer to "manage" the "broadcast" side of this, preferably somebody with at least some prior exposure to online events (like the c3voc). I'm using https://osmocom.org/issues/4928 to collect a tentative list of topics. Feel free to add your ideas there, as well as any comment/ feedback you may have. 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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OsmoBSC(config-net-bts) cell reselection parameters dont show up after set up
by Mario Lucas 16 Dec '20

16 Dec '20

Dear Team please help me with the following question: I want to set up following parameters in osmobsc config: cell bar quality cell reselection offset temporary offset penalty time cell reselection hysterisis These parameter play role when a MS should reselect another cell. These parameters do appear in OsmoBSC(config-net-bts) and i do set up them. But when i run «show running-config» only hysterisis is present… the rest have gone …. also gsmtap from wireshark does not show the rest of parameters. Pls help if you can …. Pls find the log from OsmoBSC(config-net-bts)# show running-config: OsmoBSC(config-net-bts)# show running-config Current configuration: ! ! log stderr logging filter all 1 logging color 0 logging print category-hex 1 logging print category 0 logging timestamp 0 logging print file 1 logging level rll notice logging level mm notice logging level rr notice logging level rsl notice logging level nm info logging level pag notice logging level meas notice logging level msc notice logging level ho notice logging level hodec notice logging level ref notice logging level nat notice logging level ctrl notice logging level filter debug logging level pcu debug logging level lcls notice logging level chan notice logging level ts notice logging level as notice logging level cbs notice logging level lglobal notice logging level llapd notice logging level linp notice logging level lmux notice logging level lmi notice logging level lmib notice logging level lsms notice logging level lctrl notice logging level lgtp notice logging level lstats notice logging level lgsup notice logging level loap notice logging level lss7 notice logging level lsccp notice logging level lsua notice logging level lm3ua notice logging level lmgcp notice logging level ljibuf notice logging level lrspro notice ! stats interval 5 ! line vty no login ! e1_input e1_line 0 driver ipa e1_line 0 port 0 no e1_line 0 keepalive cs7 instance 0 point-code 0.23.3 network network country code 1 mobile network code 1 encryption a5 0 neci 1 paging any use tch 0 handover 0 handover algorithm 1 handover1 window rxlev averaging 10 handover1 window rxqual averaging 1 handover1 window rxlev neighbor averaging 10 handover1 power budget interval 6 handover1 power budget hysteresis 3 handover1 maximum distance 9999 dyn_ts_allow_tch_f 0 bts 0 type sysmobts band GSM900 cell_identity 6969 location_area_code 1 base_station_id_code 63 ms max power 15 cell reselection hysteresis 4 rxlev access min 0 radio-link-timeout 32 channel allocator ascending rach tx integer 9 rach max transmission 7 channel-description attach 1 channel-description bs-pa-mfrms 5 channel-description bs-ag-blks-res 1 no access-control-class-ramping access-control-class-ramping-step-interval dynamic access-control-class-ramping-step-size 1 early-classmark-sending forbidden early-classmark-sending-3g allowed ipa unit-id 6969 0 oml ipa stream-id 255 line 0 neighbor-list mode automatic codec-support fr amr tch-f modes 0 2 4 7 amr tch-f threshold ms 32 32 32 amr tch-f hysteresis ms 8 8 8 amr tch-f threshold bts 32 32 32 amr tch-f hysteresis bts 8 8 8 amr tch-f start-mode auto amr tch-h modes 0 2 4 amr tch-h threshold ms 32 32 amr tch-h hysteresis ms 8 8 amr tch-h threshold bts 32 32 amr tch-h hysteresis bts 8 8 amr tch-h start-mode auto gprs mode none trx 0 rf_locked 0 arfcn 10 nominal power 26 max_power_red 16 rsl e1 tei 0 timeslot 0 phys_chan_config CCCH+SDCCH4 hopping enabled 0 timeslot 1 phys_chan_config TCH/F hopping enabled 0 timeslot 2 phys_chan_config TCH/F hopping enabled 0 timeslot 3 phys_chan_config TCH/F hopping enabled 0 timeslot 4 phys_chan_config TCH/F hopping enabled 0 timeslot 5 phys_chan_config TCH/F hopping enabled 0 timeslot 6 phys_chan_config TCH/F hopping enabled 0 timeslot 7 phys_chan_config TCH/F hopping enabled 0 msc 0 ip.access rtp-base 4000 no bsc-welcome-text no bsc-msc-lost-text no bsc-grace-text codec-list fr1 hr1 fr2 fr3 hr3 type normal allow-emergency allow amr-config 12_2k forbidden amr-config 10_2k forbidden amr-config 7_95k forbidden amr-config 7_40k forbidden amr-config 6_70k forbidden amr-config 5_90k allowed amr-config 5_15k forbidden amr-config 4_75k forbidden amr-payload octet-aligned asp-protocol m3ua lcls-mode disabled lcls-codec-mismatch forbidden mgw local-port 2727 mgw remote-ip 127.0.0.1 mgw remote-port 2427 bsc mid-call-timeout 0 no missing-msc-text cbc no remote-ip no listen-port end OsmoBSC(config-net-bts)# -- Mario Lucas

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Eclipse TITAN / warnings / finding errors in the log
by Harald Welte 16 Dec '20

16 Dec '20

Hi! It has recently come to my attention that people find it hard to find error messages when compiling TTCN-3 code. This is primarily due to the hundreds to thousands of compiler warnings which [at least our] code generates when building with ttcn3_compiler of TITAN. While some of those warnings indeed should be resolved, a great number of them is actually things where we know what we are doing, and where we'd normally want to disable the warnings. Unfortunately, TITAN doesn't have a system to selectively disable warnings like -Wno-foo in gcc. There are two things that help: 1) colorized output of ttcn3_compiler, which is something I submitted quite a long time ago, but which hasn't e.g. ended up yet in a number of distribution packages. Please feel free to use the eclipse-titan package we build in the OBS network:osmocom:latest feeds to get that feature 2) ttcn3_compiler actually has a '-w' command line argument to make all warnings quiet, which is also supported by ttcn3_makefilegen. You can edit the osmo-ttcn3-hacks/regen-makefile.sh to add that option to ttcn3_makefilegen 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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trx output power config in bts
by Mario Lucas 14 Dec '20

14 Dec '20

Dear team could you pls help me with this question In bts config we have following entries: trx 0 nominal power 23 ! to use full TRX power, set max_power_red 0 max_power_red 20 and osmotrx tx-attenuation (oml|<0-50>) So why do we need these «max_power_red 20» and «osmotrx tx-attenuation» which both as i understand weaken the signal? If we want to have a weak signal why we just don’t use only «nominal power» with whatever weak or strong signal value we want? Thank you so much -- Mario Lucas

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Openbsc install limenet sdr
by Choukou Moun 13 Dec '20

13 Dec '20

Hello, Anybody have success to install openbsc on limenet sdr? I have many compilation error with sources or packages. Thank you.

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Unable to send OTA updates to SIM
by bryan coxwell 08 Dec '20

08 Dec '20

The setup: - I am using Osmo-MSC, Osmo-HLR, python-smpplib, and sim-tools. My SIM card is a Sysmocom USIM-SJS1 which came with OTA keys. - Osmo-MSC has been configured to accept SMPP connections, and dcs-transparent has been set. - Using sim-tools with the --smpp flag, I generated the necessary SMPP messages to load the HelloSTK.cap file to the SIM. (Essentially, I've followed the instructions here: https://osmocom.org/projects/cellular-infrastructure/wiki/Shadysimpy) - Sim-tools outputs 6 messages, so in a separate program I use python-smpplib to push each message to the MSC over SMPP. - The send function in my program looks like this: parts = ["027000003815060115150000001dbf31df8eb85248617ff79260f7bf0abd332e2b3c> "02700000901506011515000000d85420f0f778e35b4b8e0ae5d961593444f20fdebb> "02700000901506011515000000729062e3cc920acc51be4f22fd067314bfaee313d6> "02700000901506011515000000373f30a3c12b494d3089c70a2dd46e33e3fccac790> "0270000068150601151500000083f04c39ef2df571bd5389f71b8c528e9b3edea046> "02700000601506011515000000ad6eeebc9373de8bd3a8888324ffaad4d8cd935f0c> ] for part in parts: pdu = client.send_message( source_addr_ton=smpplib.consts.SMPP_TON_INTL, source_addr='0', dest_addr_ton=smpplib.consts.SMPP_TON_INTL, destination_addr='3331112222', short_message=bytes.fromhex(part), data_coding=246, esm_class=64, registered_delivery=True, ) print(pdu.sequence) I have Wireshark running on the computer hosting the MSC, and it shows GSM SMS messages sending to the UE, however there is no response, and when I inspect the SIM card, no applet has been loaded. Am I missing something here? What could be causing this issue? Thanks!

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Re: Help on using pysim to flash a SIM card
by Chunlin Yang 03 Dec '20

03 Dec '20

Hi Vadim and all, pyProg.py fails with an error, could you help (btw, I change all real info to xxx :)): support@S2600WFT:~/pysim$ python ./pySim-prog.py -p 0 -x 208 -y 93 -t sysmoUSIM-SJS1 -i 208930000000003 --op=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -k xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -s xxxxxxxxxxxxxxxxxxxxx -a xxxxxxxx Using PC/SC reader interface Ready for Programming: Insert card now (or CTRL-C to cancel) Generated card parameters : > Name : Magic > SMSP : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > ICCID : xxxxxxxxxxxxxxxxxxxx > MCC/MNC : 208/93 > IMSI : xxxxxxxxxxxxxxx > Ki : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > OPC : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > ACC : None > ADM1(hex): xxxxxxxxxxxxxxxx Programming ... Card programming failed with an execption: ---------------------8<--------------------- Traceback (most recent call last): File "./pySim-prog.py", line 719, in <module> rc = process_card(opts, first, card_handler) File "./pySim-prog.py", line 671, in process_card card.program(cp) File "/home/support/pysim/pySim/cards.py", line 713, in program self._scc.verify_chv(0x0A, h2b(p['pin_adm'])) File "/home/support/pysim/pySim/commands.py", line 206, in verify_chv return self._tp.send_apdu_checksw(self.cla_byte + '2000' + ('%02X' % chv_no) + '08' + fc) File "/home/support/pysim/pySim/transport/__init__.py", line 104, in send_apdu_checksw raise RuntimeError("SW match failed! Expected %s and got %s." % (sw.lower(), rv[1])) RuntimeError: SW match failed! Expected 9000 and got 63c9. ---------------------8<--------------------- Programming failed: Remove card from reader Thanks. Br, Andrew On Tue, Dec 1, 2020 at 1:07 AM Chunlin Yang <chliny2016(a)gmail.com> wrote: > Thanks a lot Vadim! > I have thought it might be an issue between python3 and python2. So I have > tried on both versions. > on Python3, I got same error. > But now with this command 'python ./pySim-read.py -p0', it works. I used > to use this command './pySim-read.py -p0' and it gave me the same error. > > But although 'python ./pySim-read.py -p0' works (reads out the content of > the SIM, it gives me an error/prompt at the end: > Traceback (most recent call last): > File "./pySim-read.py", line 255, in <module> > (res, sw) = card.read_ehplmn() > AttributeError: 'OpenCellsSim' object has no attribute 'read_ehplmn' > > maybe I can just ignore this prompt as I don't need ehplmn. > > Br, > Andrew > > On Tue, Dec 1, 2020 at 12:45 AM Vadim Yanitskiy <vyanitskiy(a)sysmocom.de> > wrote: > >> On 12/1/20 2:17 AM, Chunlin Yang wrote: >> > ModuleNotFoundError: No module named 'smartcard' >> > >> > BTW, I have manually imported smartcard in python, and it's successful. >> >> I guess you have two Python versions (2.7 and 3.x), so it could be that >> you've installed smartcard for 3.x and in works in the shell. >> Unfortunately, pySim has not been completely migrated to 3.x yet, so it >> starts under 2.7 by default. You can try to run it under 3.x: >> >> python3 ./pySim-read.py -p0 >> >> or install the 'smartcard' module for Python 2.7. >> >> 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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Help on using pysim to flash a SIM card
by Chunlin Yang 01 Dec '20

01 Dec '20

Hi All,I'm following this wiki http://osmocom.org/projects/pysim/wiki I cloned pysim repo, and I cloned this repo also: git clone https://github.com/LudovicRousseau/pyscard.git *although pcsc_scan works* But when I run below: cd <pysim-path> ./pySim-read.py –p 0 *it always gives me this error:* cd ~/pysim ./pySim-read.py -p0 Traceback (most recent call last): File "./pySim-read.py", line 36, in <module> from pySim.cards import card_detect, Card File "/home/support/pysim/pySim/cards.py", line 29, in <module> from smartcard.util import toBytes ModuleNotFoundError: No module named 'smartcard' BTW, I have manually imported smartcard in python, and it's successful. Br, Andrew

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OpenBSC December 2020