OpenBSC

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4202 discussions

Who would attend a developer room / meeting at FrOSCon ?
by Harald Welte 20 Apr '10

20 Apr '10

Hi! I've been offered a 'developer room' at FrOSCon 2010 (http://www.froscon.de/) which will be at FH Bonn-Rhein-Sieg (http://www.fh-brs.de/) in Sankt Augustin from August 21/22 this year. Before sending a response, I would like to inquire whom of you would actually have any intention of visiting this conference and spending time in the developer room to work on OpenBSC or OsmocomBB ? I think the idea is great to meet some of you guys [again], not only at the annual CCC congress in winter. But there is little point for me to go there if there is no interest from the wider project community. Please provide your feedback ASAP. -- - 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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Re: Changes to the paging subsystem
by Dieter Spaar 20 Apr '10

20 Apr '10

Hello Holger, On Tue, 20 Apr 2010 10:42:34 +0800, "Holger Freyther" <zecke(a)selfish.org> wrote: > > What happens is that the IMMEDIATE ASSIGNMENT does not make it to the > phone fast enough and the same MS is sending another RA and we assign > another channel. > > The root causes consist of various issues: > - Our delay in src/input/ipaccess.c does not help, removing it > is breaking the rugby sized BTS though.. > - Our paging layer sends the paging command in bursts... we > should have an even distribution of them. > - We have some NM attributes to play with. > > I am going to poke this some more. I sometimes had the same problem in the past even with a single MS. If you want to play with the parameters which control sending the RACH burst, you can try the configuration commands "rach tx integer" for the number of slots used to spread retransmission or "rach max transmission" for the number of retransmitted burst. Of course in a perfect world OpenBSC should work with all possible configurations. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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Changes to the paging subsystem
by Holger Freyther 19 Apr '10

19 Apr '10

Hi all, I will implement the following changes on the on-waves/bsc-master branch and if no one is screaming move them over to master shortly afterwards. Right now I'm experiencing the following problem. When enabling the RF on the BTS hordes of MS come to the network for Location Updating Requests and the SDCCHs are close to 100% loaded, now I want to send a SMS to every new Subscriber welcoming it (ideally one would do it during the LU but... well... it does not). To deliver the SMS we need to page the SMS and currently we are paging 20 MSs during 2 seconds. The first problem is that the nanoBTS can not handle this load for a long time, it is sending CPU Overload and as of GSM 08.58 we should handle it by throttling the transfer but well that is not implemented. The other problem is with the 20 paging requests every two seconds I'm creating a RACH DoS for my BTS to a point that I think (didn't bother to do the easy math, and I don't have the spec here right now) we have two MS picking the same random number. At least the symptom is that even if we assign a channel, it gets closed down with a RF Failure. So here is my problem: - Remove the notion of paging slots... the nanoBTS is not even sending the load indication anyway. - Look at free channels (ignoring the requested channel at first... something we need to fix later) and have a config switch like.. only page if the cell is like 50% loaded or such. I will figure out the details while doing the changes. The other reason to write this mail is, I think it is pretty interesting to see how our experiments from the congress look different to what I was seeing due way more paging going on. regards holger

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Experimental nanoBTS EDGE support
by Harald Welte 19 Apr '10

19 Apr '10

Hi! I've been working on a set of patches to enable configuring the nanoBTS to not only support GPRS but also EDGE. After some testing, I've merged them into the master branch. In order to enable EDGE, you need to use 'gprs mode egprs'. Also, you still need an external SGSN or use the gprs-sgsn branch (which has been rebased). Your phones should then show 'E' instead of 'G'. I haven't actually benchmarked the transfer speed, i.e. if it really is giving the expected performance improvement. 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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Ericsson RBS
by Seungju Kim 18 Apr '10

18 Apr '10

I found some ericsson rbs's on eBay, they were being sold at much cheaper price than nanobts.. Will it be supported? Sent from my iPhone

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Basics
by Seungju Kim 18 Apr '10

18 Apr '10

What is the prerequisites to run a experimental gsm network? -a computer -a BTS ..and what is needed? Sent from my iPhone

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SMS Alpha Originator
by Stuart Baggs 18 Apr '10

18 Apr '10

Hi guys I have been looking through the SMS functionality of openBSC and I can see that the HLR / SMS database uses an sender_id (a secondary key of the Subscriber database). Is it possible to send SMS messages with an alpha originator i.e. from a string of text up to 11 characters? I also noticed that using the telnet interface, the command to send a SMS does not leave a trace in the sql database. Thanks, Stuart

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Does anybody sell BTSs?
by Seungju Kim 18 Apr '10

18 Apr '10

Hello I am interested in buying a BS-11 or nanoBTS for testing.. I tried contacting ip.access but they demand a spectrum license...:( Does anybody have some for sale? Sent from my iPhone

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Re: BS-11 multidrop problem
by till 15 Apr '10

15 Apr '10

Hi, i am still trying to get hose two BS-11 to run. The hfcmulti driver is now configured with dmask and bmask (just had the wrong version, thx to Andreas). But there are still no OML and RSL-connections to the second BS-11 initialized. And i found no possibility to put bport1 into multidrop. I appreciate any help :) ! "The problem is now solved. It seems that we need to create the BPORT1 object on BTS-A, and configure both BPORT0 and BPORT1 into multi-drop mode. Thanks to Dieter for his help with that." Greets Till Some outputs: ____BS-11_A____________________________________________ (create bport1 and put bport0 into multidrop) ./bs11_config query bs11_config (C) 2009 by Harald Welte and Dieter Spaar This is FREE SOFTWARE with ABSOLUTELY NO WARRANTY LMT LOGON: ACK PHASE: 3 Normal MBCCU0: Load MBCCU1: No Load Abis-link: Restoring BS11 ATTRIBUTES: BS-11 ESN PCB Serial Number: 001127 BS-11 ESN Hardware Code Number: 135-2044/03.03 BS-11 ESN Firmware Code Number: 135-2044/03.03 PLL Set Value=1026, Work Value=1026 SITE MANAGER ATTRIBUTES: E1 Channel: Port=0 Timeslot=1 (Full Slot) TEI: 25 BS11 Line Interface ATTRIBUTES: PLL Mode: Standalone BS11 CCLK ATTRIBUTES: CCLK Accuracy: Medium (0) BS11 Power Amplifier 0 ATTRIBUTES: TRX Power: 30mW (GSM) LMT LOGOFF: ACK ____BS-11_B____________________________________________ ./bs11_config query bs11_config (C) 2009 by Harald Welte and Dieter Spaar This is FREE SOFTWARE with ABSOLUTELY NO WARRANTY LMT LOGON: ACK PHASE: 3 Normal MBCCU0: Load MBCCU1: Unknown Abis-link: Restoring BS11 ATTRIBUTES: BS-11 ESN PCB Serial Number: 000432 BS-11 ESN Hardware Code Number: 135-2044/02.07 BS-11 ESN Firmware Code Number: 135-2044/02.07 PLL Set Value=942, Work Value=942 SITE MANAGER ATTRIBUTES: E1 Channel: Port=1 Timeslot=17 (Full Slot) TEI: 26 BS11 Line Interface ATTRIBUTES: PLL Mode: Standalone BS11 CCLK ATTRIBUTES: CCLK Accuracy: Medium (0) BS11 Power Amplifier 0 ATTRIBUTES: TRX Power: 30mW (GSM) LMT LOGOFF: ACK ____MISDN____________________________________________ debian:/home/till/openbsc/openbsc/src# misdn_info Found 2 ports Port 0 'hfc-e1.1-1': TE/NT-mode PRI E1 (for phone lines & E1 devices) 14 B-channels: 2-15 B-protocols: RAW HDLC X75slp L2:DSP L2:DSPHDLC -------- Port 1 'hfc-e1.1-2': TE/NT-mode PRI E1 (for phone lines & E1 devices) 14 B-channels: 18-31 B-protocols: RAW HDLC X75slp L2:DSP L2:DSPHDLC ____DEBUG____________________________________________ debian:/home/till/openbsc/openbsc/src# ./bsc_hack DB: Database initialized. DB: Database prepared. e1_reconfig_bts(0) e1_reconfig_ts(0,0,0) e1_reconfig_ts(0,0,1) e1_reconfig_ts(0,0,2) e1_reconfig_ts(0,0,3) e1_reconfig_ts(0,0,4) e1_reconfig_ts(0,0,5) e1_reconfig_ts(0,0,6) e1_reconfig_ts(0,0,7) 2 devices found id: 0 Dprotocols: 00000018 Bprotocols: 0000006e protocol: 0 nrbchan: 14 name: hfc-e1.1-1 e1_reconfig_bts(1) e1_reconfig_ts(1,0,0) e1_reconfig_ts(1,0,1) e1_reconfig_ts(1,0,2) e1_reconfig_ts(1,0,3) e1_reconfig_ts(1,0,4) e1_reconfig_ts(1,0,5) e1_reconfig_ts(1,0,6) e1_reconfig_ts(1,0,7) 2 devices found id: 1 Dprotocols: 00000018 Bprotocols: 0000006e protocol: 0 nrbchan: 14 name: hfc-e1.1-2 activate bchan bootstrapping OML for BTS 0 <0020> abis_nm.c:1644 Set BTS Attr (bts=0) <0020> abis_nm.c:1661 Set TRX Attr (bts=0,trx=0) <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=0) <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=1) <0020> abis_nm.c:1744 Invalid Channel Combination!!! <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=2) <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=3) <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=4) <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=5) <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=6) <0020> abis_nm.c:1741 Set Chan Attr (bts=0,trx=0,ts=7) <0020> abis_nm.c:805 OC=SITE MANAGER(00) INST=(ff,ff,ff) Software Activated Report bootstrapping RSL for BTS/TRX (0/0) using MCC=1 MNC=1 BSIC=63 TSC=7 <0020> abis_nm.c:805 OC=BPORT(a9) INST=(01,ff,ff) Failure Event Report Severity=major failure <0020> abis_nm.c:805 OC=BPORT(a9) INST=(01,ff,ff) STATE CHG: ____Config____________________________________________ ! ! OpenBSC configuration saved from vty ! ! password foo ! line vty no login ! network network country code 1 mobile network code 1 short name OpenBSC long name OpenBSC bts 0 type bs11 band GSM900 cell_identity 1 location_area_code 1 training_sequence_code 7 base_station_id_code 63 oml e1 line 0 timeslot 1 sub-slot full oml e1 tei 25 trx 0 arfcn 101 max_power_red 6 rsl e1 line 0 timeslot 1 sub-slot full rsl e1 tei 1 timeslot 0 phys_chan_config CCCH+SDCCH4 e1 line 0 timeslot 1 sub-slot full timeslot 1 phys_chan_config SDCCH8 e1 line 0 timeslot 2 sub-slot 1 bts 1 type bs11 band GSM900 location_area_code 2 training_sequence_code 7 base_station_id_code 62 oml e1 line 1 timeslot 17 sub-slot full oml e1 tei 26 trx 0 arfcn 122 max_power_red 0 rsl e1 line 1 timeslot 17 sub-slot full rsl e1 tei 2 timeslot 0 phys_chan_config CCCH+SDCCH4 e1 line 1 timeslot 17 sub-slot full timeslot 1 phys_chan_config SDCCH8 e1 line 1 timeslot 18 sub-slot 1 timeslot 2 phys_chan_config TCH/F e1 line 1 timeslot 18 sub-slot 2 > BS-11 multidrop problem (till) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 20 Mar 2010 01:47:53 +0100 > From: till <tillusbazillus(a)gmx.net> > Subject: BS-11 multidrop problem > To: openbsc(a)lists.gnumonks.org > Message-ID: <1269046073.8017.13.camel@core2> > Content-Type: text/plain > > Hi, > > i want to operate two BS-11 via one E1-card. And i did it almost like > here: > http://lists.gnumonks.org/pipermail/openbsc/2009-August/000733.html > But i dont know how to configure the bport1 object for multidrop and how > to use the hfcmulti module to get two interfaces (for lcr i compiled > misdn_l1loop but i think this isnt the right here ;)). So atm i am not > able to communicate with the second BS11 :/. Any idea? > > Thx & Greets Till

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Introductory text on typical GSM phone hardware
by Harald Welte 14 Apr '10

14 Apr '10

Hi! While working on OsmocomBB, I wrote a small introductory text explaining how current GSM phone hardware actually looks like (and works). You can download it from http://laforge.gnumonks.org/papers/gsm_phone-anatomy-v0.2.pdf Hope this is useful for one or the other person here on this list... 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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