OpenBSC

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4317 discussions

Compiling OpenBSC to use an extern MSC
by Luca Bertoncello 09 Dec '10

09 Dec '10

Hi, list! I'd like to try to compile OpenBSC with the A-over-IP in order to connect it to a real MSC. I found this document: http://openbsc.osmocom.org/trac/wiki/OpenBSCWithSCCP But when I try to get the branch I get an error: $ git checkout -b on-waves/bsc-master origin/bsc-master git checkout: updating paths is incompatible with switching branches/forcing Did you intend to checkout 'origin/bsc-master' which can not be resolved as commit? Is now this project in another branch? Can someone say me, what I have to do to compile it? Thanks a lot! -- _______________________________________________________________________ Luca Bertoncello Entwicklung Mail: bertoncello(a)netzing.de NETZING Solutions AG Tel.: 0351/41381 - 23 Fröbelstr. 57, 01159 Dresden Fax: 0351/41381 - 12 _______________________________________________________________________ Impressum: NETZING Solutions AG - Fröbelstraße 57 - 01159 Dresden Sitz der Gesellschaft Amtsgericht Dresden HRB 18926 Vorstand Dieter Schneider - Aufsichtsratsvorsitzender Volker Kanitz USt.Id DE211326547 Mail: netzing.ag(a)netzing.de

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Moving subscr_{get/put}_channel in gsm_subscr.c (instead of gsm_subscr_base.c)
by Sylvain Munaut 09 Dec '10

09 Dec '10

Hi, I'm now having another look at implementing MT ciphering. For this, I need to work inside the paging system. What I'd like is that the MSC part instead of ever using paging_request directly, that they all use subscr_get_channel. Then this would also encapsulate securing the channel and only call the call back when the channel has been ciphered and is ready for the MSC part. This requires making some gsm_04_08 call inside the subscr_get_channel, so I need to move that call to the 'msc' side of gsm_subscr.c To me, it makes sense. I don't see in what context a BSC would use get/put channel ... the BSC doesn't decide, it's just ordered what to do by the MSC IIUC. I would then also replace all calls to paging_request in gsm_04_08.c by calls to subscr_get_channel. And also move the "paging_succeded" signal dispatch to the subscr_get_channel call back and not directly from gsm_04_08_utils.c (since that signal is used currently to trigger SMS delivery and other "side" things when we have a channel, it's more a MSC thing). Finally, I'd need to pass the msgb paging response all the way to the paging callback because it contains important field to enable ciphering. Any objections to this plan ? Did I miss something ? Cheers, Sylvain

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multi-drop-configuration
by Thomas Ansorg 09 Dec '10

09 Dec '10

hello the cables are built, now i want to use 2 bs11 in multi drop config. how do i connect the 2 bs11? the e1 comes from the pc to the 1st bs11 left half, left tx, right rx(front view). now i'm on the right half: to which port are the 2 bnc port from the 1st to the 2nd bs11 to be connected? i tried the 2 possible combinations, didn't work (with the openbsc.cfg.2-2). the 2 bs11 are both set to tei=25 (bs11_config told me so) a schematic would be perfect. second problem: the timer instructions in the openbsc.cfg.2-2 are not executable, the bsc_hack program stops there. i had to remove them. what's the matter with that, why don't these timer instructions work? answers in german *very* welcome! -- Wer Rechtschreibfehler findet, darf sie behalten!

2 1

socket problem
by jason mercury 07 Dec '10

07 Dec '10

Hi to all, In order to execute two bsc_hack at the same time i have changed port for oml link from nv_put_oml() function in ipaccess_config.c and i also changed oml port from ipaccess.h . When i configure nanoBTS with ipaccess_config i can establish two different oml link between two bsc_hack and two nanoBTS. rslHowever, they can not establish link at the same time. I could not find where can i change rsl port of nanoBTS. I have searched the wiki and i could not find a nanoBTS message to change the port specified for rsl link. Could anyone give me some information about this? Thanks. Jason

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OpenBSC and Asterisk with NanoBTS and no ISDN
by Chris Rankine 07 Dec '10

07 Dec '10

I am trying to get OpenBSC working with Asterisk for a class project. I have a NanoBTS DCS1800. I was hoping to get this to work entirely over Ethernet, as the server is running on a controlled VM cluster with no way of getting an add-on ISDN card in. I have attempted to follow the OpenBSC+LCR+Asterisks route. But as expected, LCR gives me issues when it does not find an ISDN card. I am not familiar with LCR to tweak it. Can I use LCR without an ISDN card? What should I look into to get this done? I have also attempted to modify the asterisk chan_openbsc code to comply with the libosmo break off earlier this year. With a few Makefile adjustments, include a few more header files, and strip out some debuging code, everything will compile. However, asterisk seg faults when the module loads. The gdb output is: Program received signal SIGSEGV, Segmentation fault. 0xb72fcd1d in cmd_execute_command_strict (vline=0x83d4c88, vty=0x83c2450, cmd=0x0) at command.c:2000 2000 cmd_vector = vector_copy(cmd_node_vector(cmdvec, vty->node)); I am not familar with this code, so all I can do is comment out things in an attempt to debug. Eventually I keep it from crashing, and the nanoBTS will make contact with the driver. However, since the code that gets commented out also involves loading the cfg, the BTS does not get bootstraped. This is all running on Gentoo, though I have also tried on Debian and Ubunto. Any help would be appreciated.

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Re: Calls are "stuck"
by Dieter Spaar 05 Dec '10

05 Dec '10

Hello Andreas, On Sun, 05 Dec 2010 00:28:27 +0100, "Andreas Galauner" <andreas(a)galauner.de> wrote: > > Also, the network sometimes is hard to find on the mobile phones. We > blame a bad calibrated oscillator for that. As soon as we got an HFC-S > card, we will try to recalibrate it. As I mentioned here a few days before, its usually enough to reset the PLL "work value" to its "set value" with bs11_config ("pll_workvalue" command) and set the PLL to standalone ("pll_standalone" command). > Is it possible that all those problems show up because of the > oscillator? And why did it work really well on Thursday? I don't think that the problems with calls are related to the oscillator, I would expect that this is related to the misdn errors you see. Maybe the ISDN cable termination is not set properly ? Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Calls are "stuck"
by Andreas Galauner 04 Dec '10

04 Dec '10

Hello everybody, this is my first post to this list. I've been reading it for a while now and I'm finally trying to get a bit deeper into GSM. We have a BS11 in the C4 (Chaos Computer Club Cologne) which I got fully working on Thursday this week. We had several mobile phones in the network and called each other and we could send and receive sms. All fine. Today I wanted to test another few things and everything got weird: I have 2 mobile phones authenticated in the network. One phone can call the other one, it rings and after accepting the call, the first still plays the "ringing sound", while everything on the second is silent. Vice versa, if I call the first mobile from the second, it dials endlessly. Sometimes OpenBSC segfaults. Before it does that, it tells me on the console that timer T303 expired. Another thing are those masses of "mISDN_send: error -12" messages in the kernel log. We got those on Thursday, too but they weren't important to us, because everything worked. Nevertheless, sending and receiving SMS still works. Also, the network sometimes is hard to find on the mobile phones. We blame a bad calibrated oscillator for that. As soon as we got an HFC-S card, we will try to recalibrate it. Is it possible that all those problems show up because of the oscillator? And why did it work really well on Thursday? So far, I tried a few obvious things like rebooting, both the computer and the BS11, cleaning and recompiling everything and I even deleted the old HLR database. I really don't know what to do else. <Insert helpless cry here> ;) Does anybody of you have an idea what I can try? We are running the latest OpenBSC from the git on a Debian testing with a stock 2.6.32-5 kernel on i686. Greetings, Andy

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BS11 power problem
by Sergey V. Efimoff 03 Dec '10

03 Dec '10

Hello All, Herr Thomas had raised up a discussion about problem with setting of BTS power attribute value. In connection with this question, I recall another problem which has occurred with one of my BTS's. It has a very strange behavior. Its output power is set to 2W. My measure device tells me that receive level at the desired channel is about -24 dBm after station boot-up. This value is very good, no other base station around shows better results. But right after the very first GSM call the receive level quickly jumps down to -70 or even -80 dBm, this value corresponds to 30mW of output power. BTS station still works and output power is still shown as 2W. This effect had been discovered with only one of my BTS stations, while other stations work well. Does it mean that it's a hardware problem? Has anyone discovered this problem earlier? Best Regards, Sergey.

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nanoBTS BER Test
by EGU 2100 02 Dec '10

02 Dec '10

Hi, I like to perform a TCH BER Test for nanoBTS via R&S CMU300. Does anyone know how to configure the nanoBTS using ipaccess-config to perform this BER test? Thanks! EGU

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Re: bs11 not working
by Dieter Spaar 02 Dec '10

02 Dec '10

Hello Sergey, On Thu, 2 Dec 2010 21:08:09 +0300, "Sergey V. Efimoff" <risky(a)mail.ru> wrote: > > I had once or twice seen BTS stations which had working PLL value > very different from calibrated value. In order to get them close I had to > use E1 hardware with high precision oscillator, then switch the > hardware to the PLL-locked mode. This operation took me plenty > of time. > > Please tell, is it possible to set the working PLL value directly? Yes, bs11_config supports this. Its the "pll-workvalue" command. The way how the PLL workvalue could be set was not obvious so it took a while till we found out how this could be done. Thats the reason why it took quite long till this command was introduced. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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