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Re: BS-11 runs, but no Network on my Mobile
by Dieter Spaar 03 Apr '09

03 Apr '09

Hello Marcel, On Thu, 02 Apr 2009 22:33:01 +0200, "Marcel Klein" <marcel(a)koeln.ccc.de> wrote: > > Okay, second try didn't work anymore... so the problem still exists. I > even tried 250mW. I received an important hint that the problem is most certainly related to a clock issue. Some background: The BS-11 synchronizes its internal clock to the clock of the E1 line. Its does not have a high stability clock which is needed for GSM. The official networks use a very stable and exact clock, the requirement for a BTS according to GSM 05.10 is +/-0.05 ppm. (There was a variant of the BS-11 sold which had a versatile interface card which can also work with standard ISDN, this variant had an oven controlled oscillator which can run standalone with the required stability. But we don't have any of this BS-11 variant). The phone itself synchronizes its clock from the network it receives. If the phone searches for networks, the carrier search range is limited to a certain window, it will only find a network if the carrier falls inside this window. Now the problem: If the phone is synchronized to an official network and searches for other networks, it will only find them if they are within the search range. No problem for an official network, they use exact timing. However if the BS-11 network is not within the range, its network is not found. When the phone is powered on and not yet synchronized, the search range window is larger, however the phone starts looking at the ARFCNs first which it received the last time when it was registered to a network. So it normally would find an official network first and miss the BS-11 if its is clock is off too far. To confirm this, I run a test with an HP 8922 GSM tester. It can simulate a network and also has a tuneable reference. If I start with a phone registered to an official network, I can only see the HP 8922 network if the refenrence is with about +/- 1 ppm. The same is true the other way round, if I start beeing registered to the HP 8922 network, I can only see the official networks if the reference is within the above range. I used an older Nokia phone for my tests, the range may depend on the phone. If the BS-11 is locked to the E1 clock, its reference is controlled by the oscillator of the E1 card. ISDN timing requirements are not very strict, +/- 50 ppm is good enough. I don't have the datasheet for the oscillator on the HFC-E1 card, probably the clock can be in the range of +/- 20 ppm. Two ideas to solve this: Start at a place were no other network than the BS-11 network can be received (OK, could be difficult ;-). Or write the information of the BS-11 network to the SIM card so that the phone starts receiving the BS-11 ARFCN when powerted on. Basically this information is the cell allocation information in SYSTEM INFORMATION 2 and have to be written to EF_BCCH on the SIM card (if you want to change the location update information on the SIM card so that the phone is already registered in advance, EF_LOCI has to be modified). One other thing: I did not notice those problems with the BS-11 yet. This ccould have two reasons: Differences in the oscillator drift or because I usually turn off the HFC-E1 card if I don't use OpenBSC. mISND on Linux is constantly running and the E1 clock is on all the time, here in my configuration (Windows) I turn off the HFC-E1 chip after running OpenBSC. According to some documentation it can take up to 30 minutes until the BS-11 synchronizes to the E1 clock. So maybe the BS-11 oscillator is better than the oscillator of the E1 card and so the problem only occurs if the BS-11 is locked to the E1 card ? Just a guess, but I will try to see if I find an easy way to measure the BS-11 clock. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: AW: AW: AW: BS-11 runs, but no Network on my Mobile
by Dieter Spaar 01 Apr '09

01 Apr '09

Hello Andreas, On Wed, 1 Apr 2009 13:44:52 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > > does BS-11 need to react on telephone messages in order to show the > network to the phone? or does the phone just receive the BS-11 > signalling information in order to display the available network? i > don't know if the receiver works. To just "see" the network, the phone does not have to send anything and the BS-11 does not need to receive anything. This is necessary only when the phone registers to the network (Location Update). However the Abis link has to be up so that the cell information is sent, if the Abis link is down, the transmitter is most certainly still sending (I measured this here, but it was not yet confirmed by others so it might be wrong) but a phone won't see the network (probably no system information is sent in this case). > also i can create BBSIG1 and PA1, but it will not be used by bsc_hack. > what do i need to change in order to use the second transponder? maybe > this one works. I am not sure if OpenBSC already supports the second TRX. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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BS-11 runs, but no Network on my Mobile
by Andreas.Eversberg 01 Apr '09

01 Apr '09

hi, i finally completed the BS-11 setup: - original kernel 2.6.27.4 the mISDN-patch was for - bs11 with software load as described in the wiki - all BS-11 objects created as described - PA test passed - LMT shows no alarms (except cabinet-alarm) - after start of bsc_hack, all 8 channels on the first tansmitter are provisioned. - FM receiver clearly receives transmitter on channel 123, where no other base station is transmitting but i do not get any other network on my mobile. my mobile just finds: e-plus, t-mobile, o2, vodafone any ideas? thanx in advance andreas

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Re: AW: AW: BS-11 runs, but no Network on my Mobile
by Dieter Spaar 01 Apr '09

01 Apr '09

Hello Andreas, On Wed, 1 Apr 2009 12:36:15 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > the load is correct. i get an error pop-up while starting bsc_hack. this > is because the LMT seems not to be 100% compatible with the load. with > an older load i don't get this error pop-up, but it also doesn't work. > also no alarms show on the LMT after syncing database. i will get the > exact error message this weekend. The error message that LMT is not compatible to the firmware version should be no problem, it just complains about unknown attributes. Its strange, because you already know that the transmitter is working, so I wonder why you don't receive something on the phone. Have you tried a different phone, just to be sure ? Maybe also using a different ARFCN might help. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: AW: BS-11 runs, but no Network on my Mobile
by Dieter Spaar 01 Apr '09

01 Apr '09

Hello Andreas, On Wed, 1 Apr 2009 11:26:18 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > i tried two different loads, many reboots. also i reconfigured the > objects (delete / create). many restarts of the bsc_hack always gave the > same results. transmitter is working fine, but no network indication on > my mobile. (manual search). This is strange. You have LMT, right ? And the correct version of the firmware is loaded into the BS-11 ? HS010876.SWL for "SW Safety Load" and HS011106.SWL for the normal software ? > if it helps, i can provide root access to my test server this weekend. I most certainly cannot help this way, if bsc_hack sends the configuration and LMT shows no alerts than the BS-11 should actually work as configured by bsc_hack. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Re: BS-11 runs, but no Network on my Mobile
by Dieter Spaar 01 Apr '09

01 Apr '09

Hello Andreas, On Wed, 1 Apr 2009 10:30:26 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > > but i do not get any other network on my mobile. my mobile just finds: > e-plus, t-mobile, o2, vodafone > > any ideas? Have you already tried to restart OpenBSC ? I sometimes had the impression that the first configuration of the BS-11 after it has been turned on does not work. The second try to configure the BS-11 usually works. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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WG: AW: BS-11 runs, but no Network on my Mobile
by Andreas.Eversberg 01 Apr '09

01 Apr '09

the load is correct. i get an error pop-up while starting bsc_hack. this is because the LMT seems not to be 100% compatible with the load. with an older load i don't get this error pop-up, but it also doesn't work. also no alarms show on the LMT after syncing database. i will get the exact error message this weekend. -----Ursprüngliche Nachricht----- Von: Dieter Spaar [mailto:spaar@mirider.augusta.de] Gesendet: Mittwoch, 1. April 2009 13:48 An: Andreas.Eversberg Cc: openbsc(a)lists.gnumonks.org Betreff: Re: AW: BS-11 runs, but no Network on my Mobile Hello Andreas, On Wed, 1 Apr 2009 11:26:18 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > i tried two different loads, many reboots. also i reconfigured the > objects (delete / create). many restarts of the bsc_hack always gave the > same results. transmitter is working fine, but no network indication on > my mobile. (manual search). This is strange. You have LMT, right ? And the correct version of the firmware is loaded into the BS-11 ? HS010876.SWL for "SW Safety Load" and HS011106.SWL for the normal software ? > if it helps, i can provide root access to my test server this weekend. I most certainly cannot help this way, if bsc_hack sends the configuration and LMT shows no alerts than the BS-11 should actually work as configured by bsc_hack. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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AW: BS-11 runs, but no Network on my Mobile
by Andreas.Eversberg 01 Apr '09

01 Apr '09

i tried two different loads, many reboots. also i reconfigured the objects (delete / create). many restarts of the bsc_hack always gave the same results. transmitter is working fine, but no network indication on my mobile. (manual search). if it helps, i can provide root access to my test server this weekend. -----Ursprüngliche Nachricht----- Von: Dieter Spaar [mailto:spaar@mirider.augusta.de] Gesendet: Mittwoch, 1. April 2009 13:13 An: Andreas.Eversberg Cc: openbsc(a)lists.gnumonks.org Betreff: Re: BS-11 runs, but no Network on my Mobile Hello Andreas, On Wed, 1 Apr 2009 10:30:26 +0200, "Andreas.Eversberg" <Andreas.Eversberg(a)versatel.de> wrote: > > but i do not get any other network on my mobile. my mobile just finds: > e-plus, t-mobile, o2, vodafone > > any ideas? Have you already tried to restart OpenBSC ? I sometimes had the impression that the first configuration of the BS-11 after it has been turned on does not work. The second try to configure the BS-11 usually works. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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BS11 configuration problem
by Michael Gernoth 31 Mar '09

31 Mar '09

Hi, after receiving an E1 card, I tried (unsuccessfully) to get bsc_hack up and running: http://pbot.rmdir.de/19e2baa94ffedfdb814dce0a9346532e After that, no new network can be found with a mobile phone. bs11_config is reporting: PHASE: 3 Normal MBCCU0: Load MBCCU1: Load Abis-link: Up When bsc_hack is started, the following message appears a huge number of times in the kernel log: Mar 1 17:24:51 faui43g kernel: mISDN_send: error -12 and then sometimes messages like: Mar 1 17:24:52 faui43g kernel: ph_data_indication 0x0 0x3 0x0 The kernel version is 2.6.27.19 (patched), but I also tried the newest git tree from Linus with the same results. I think the configuration of my BS-11 is somehow broken, as both TRX seem to be enabled: BS11 Power Amplifier 0 ATTRIBUTES: TRX Power: 30mW (GSM) BS11 Power Amplifier 1 ATTRIBUTES: TRX Power: 30mW (GSM) But running bs11_config delete-trx1 (or create-trx1) just produces BS11 DELETE OBJECT NACK (respectively BS11 CREATE OBJECT NACK): http://pbot.rmdir.de/53344f67ed0cb86f24c4a79f0af4fe2e Trying to reset the standard configuration by deleting and recreating all objects in create_objects() doesn't work, too: http://pbot.rmdir.de/13e0b928689c0d527b13fa52698b9391 (Patch: http://pbot.rmdir.de/e549a8a52da6d389326e2e2891c2f289) It seems to me, that I have to reset the BS-11 to the factory defaults and recreate the configuration with bs11_config, but I don't know how to do that (and if I need the firmware files for that...). Did I miss something obvious, or is the configuration of my BS11 somehow broken? Thanks & Regards, Michael -- Michael Gernoth Department of Computer Science IV Martensstrasse 1 D-91058 Erlangen Germany University of Erlangen-Nuremberg http://www4.informatik.uni-erlangen.de/~gernoth/

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RequestForHelp on mISDNUser
by Holger Freyther 31 Mar '09

31 Mar '09

Hey guys, some month ago I added basic support to dump the LAPD frame we send and receive. This code was disabled in Haralds restructuring of this layer in order to add support for the IP Access nanoBTS. The question is now should we repair or nuke this feature. Shortly after having finished my implementation prom pointed me to the mISDNuser tool[1]. It looks like this can write pcap files as well and that wireshark should be able to handle them. I would be happy if someone could try this tool and see what files are produced and if we should continue this way or restore the "-p file" functionality. thanks z. PS: Maybe we just need to move the pcap Linux-LAPD header over to this tool... [1] http://git.misdn.org/?p=mISDNuser.git;a=blob;f=debugtool/mISDNdebugtool.c;h…

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