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4315 discussions

GPRS not coming up on NanoBTS 140
by Gus Bourg 15 Oct '11

15 Oct '11

Hello all, Looking for ideas. I have a NanoBTS Model 140 which doesn't seem to work with GPRS. It never connects to the SGSN. The openbsc/sgsn environment is ok - I can swap in another nano and it works fine. I've taken some log captures:

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RFC: sgsn should command/response set to 1 in gsm48_tx_gmm_ra_upd_rej?
by Holger Hans Peter Freyther 14 Oct '11

14 Oct '11

Hi, I think the REJECT should be sent with the C/R bit set to 1? holger

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"Mandatory info element out of sequence"
by anish achenkunju 14 Oct '11

14 Oct '11

Hi All, I'm getting the following error "Received packet without a valid source address!!!" on sgsnemu 0.84 [root@n003-000-000-000 openggsn-0.84]# sgsnemu --listen 7.7.7.7 --remote 7.7.7.1 --timelimit 10 --contexts 1 --apn internet --imsi 2400112 34567890 --msisdn 46702123456 -u root -p nsil --createif --defaultroute Using default DNS server Local IP address is: 7.7.7.7 (7.7.7.7) Remote IP address is: 7.7.7.1 (7.7.7.1) IMSI is: 240011234567890 (0xf098765432110042) Using NSAPI: 0 Using GTP version: 1 Using APN: internet Using selection mode: 1 Using MSISDN: 46702123456 Initialising GTP library openggsn[4597]: GTP: gtp_newgsn() started Setting up interface Done initialising GTP library Sending off echo request Setting up PDP context #0 Waiting for response from ggsn........ Received echo response Received create PDP context response. IP address: 218.59.100.38 Disconnecting PDP context #0 Received packet without a valid source address!!! [root@n003-000-000-000 openggsn-0.84]# The error I get on GGSN (Cisco 7200) on debugging is "Mandatory info element out of sequence" *Oct 13 17:01:42.444: GTP IE:4200113254769800:rcvd 0 out of order previous IE 0 *Oct 13 17:01:42.448: %GTP-2-PDPACTIVATIONFAIL: GTP PDP activation/update failed, GSN: 0.0.0.0, TID: 00, Reason: Mandatory info element out of sequence I'm sticking with 0.84 as 0.91 has a bug while sending echo " Mandatory IE invalid" . Any help on this is greatly appreciated. Thank you, Anish

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libosmocore licensing
by Alexander Chemeris 13 Oct '11

13 Oct '11

Hi all, but especially Harald, We're looking for a good library with complex arithmetic, bit functions and other RF processing stuff to be used as a base for porting of our WiMAX stuff to C/C++. I'm looking at libosmocore as a perfect candidate for that, but we're going to release our work under LGPL and thus we want an LGPL base library. I wonder, is it possible to re-license libosmocore under LGPL instead of GPL? I know that Sylvain has no strong objections about that. Harald, Holger and other contributors - what would you say? In general, I believe that LGPL is much better suited for libraries then GPL and many widely used libraries, like ffmpeg, use it with great success. And I wish libosmocore to be as successful as those LGPL libraries. PS Our WiMAX effort is to create an open-source receiver for Mobile WiMAX: http://code.google.com/p/wimax-scanner/ We have written somewhat working Matlab code and we're going to port it to something more real-time now. -- Regards, Alexander Chemeris.

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libosmocore lapd_rx_u and unitialized rc
by Holger Hans Peter Freyther 12 Oct '11

12 Oct '11

Hi all, in the above method there are paths were rc will never be initialized. I think initializing rc = 0 or -EINVAL would be cheating, instead we should consider splitting it into manageable pieces. holger

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[PATCH 0/1] [v2] openbsc (master): libctrl: bugfix to prevent a SIGABRT
by Alexander Huemer 11 Oct '11

11 Oct '11

In case the control interface on TCP port 4249 is used in an unintended way, a SIGABRT can be caused because of a missing initialization of a msgb*. The upcoming patch fixes this bug. If the patch seems useful, please feel free to merge it. Kind regards, -Alexander Huemer Alexander Huemer(1): libctrl: only free() msgb if it was alloc()ed openbsc/src/libctrl/control_if.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)

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[PATCH 0/1] openbsc (master): libctrl: bugfix to prevent a SIGABRT
by Alexander Huemer 11 Oct '11

11 Oct '11

In case the control interface on TCP port 4249 is used in an unintended way, a SIGABRT can be caused because of a double talloc_free() call on a msgb*. The upcoming patch fixes this bug. If the patch seems useful, please feel free to merge it. Kind regards, -Alexander Huemer Alexander Huemer(1): libctrl: only free() msgb if it was alloc()ed openbsc/src/libctrl/control_if.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-)

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Re: Mandatory info element invalid
by anish achenkunju 11 Oct '11

11 Oct '11

Hi All, Finally I got the setup up and running using Openggsn 0.84, seems like there is a bug in version 0.91 which was causing the earlier reported issue. I've sgsnemu sending packets to Cisco 7200 gprs code emulated on dynmips now which inturn is configured to authenticate via FreeRadius. Everything works now, i'm able to get sgnsemu send packets with username password for the apn to get it authenticated via AAA. My next challenge are: 1. To get sgsnemu read configuration file. Can anyone help me with a sample to do this, would like to see a configuration file where i can have multiple packets with different apn, qos ,imsi being sent out with having to manually type via cli. At this point , i see that there is a limitation of binding only one sgsnemu instance to local interface, is there a way to have multiple instances running? 2. Also would want to setup charging gateway if possible, i couldnt find a live download link to open charging gateway . Would greatly appreciate any inputs on the same. Thank you, Anish ________________________________ From: anish achenkunju <anish_achenkunju(a)yahoo.com> To: "openbsc(a)lists.osmocom.org" <openbsc(a)lists.osmocom.org> Sent: Wednesday, September 21, 2011 4:57 PM Subject: Fw: Mandatory info element invalid Dear All, I'm using sgsnemu of openggsn 0.91 to send traffic to Cisco 7200 GGSN code running on dynamips. [root@localhost ~]# sgsnemu -l 3.3.3.3 -r 3.3.3.1 Using default DNS server Local IP address is: 3.3.3.3 (3.3.3.3) Remote IP address is: 3.3.3.1 (3.3.3.1) IMSI is: 240010123456789 (0xf987654321010042) Using NSAPI: 0 Using GTP version: 1 Using APN: internet Using selection mode: 1 Using MSISDN: 46702123456 Initialising GTP library openggsn[24632]: GTP: gtp_newgsn() started Done initialising GTP library Sending off echo request Setting up PDP context #0 Waiting for response from ggsn........ I'm getting the following error on GGSN: *Sep 19 20:45:35.487: %GTP-2-PDPACTIVATIONFAIL: GTP PDP activation/update failed, GSN: 0.0.0.0, TID: 00, Reason: Mandatory info element invalid *Sep 19 20:45:35.491: %GTP-0-GTPv1PACKETPARSINGERROR: GSN: 3.3.3.1, TEID: 1, APN: NULL, Reason: Mandatory ie incorrect Mandatory info element invalid And the following cause value on sgsnemu: Received echo response Received create PDP context response. Cause value: 201 Seems like the GSN adddr 0.0.0.0 ,TID: 00 generated by sgsnemu are invalid. Looking forward for a workaround fix to help me move forward, any help is greatly appreciated. Thank you in advance, Anish

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GPRS' PDCH idle filling
by Alexander Chemeris 08 Oct '11

08 Oct '11

Hi all, Does anyone know how should we fill PDCH when no downlink transmission is present? I can't find any mention about this in the standard. If someone have traces from existing networks, I would very much appreciate this. Some background - we've recently started working on GPRS implementation for OpenBTS, and we're stuck at the very beginning - mobile sends RACH, but doesn't respond to our Packet Channel Immediate Assignment. After spending quite some time tweaking Immediate Assignment message, our conclusion is that mobile may want to see some "filler" date at the idle PDCH and we don't do this yet. I know that OpenBSC has GPRS working, so I hope someone here may help us. -- Regards, Alexander Chemeris.

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Update to gen_ladder.pl tool
by Harald Welte 07 Oct '11

07 Oct '11

Hi! I've finally taken some time to re-write the gen_ladder tool in order to avoid the stupid 'bent arrow' problem that was caused by using 'dot'. I'm now drawing bitmap images directly from Perl using 'GD', rendering PNG images. Support for printing a title and automati scaling of the font size has been added. However, this new version doesn't yet support the bi-directional arrows and dashed lines. Patches are welcome ;) I tried to use GD::SVG at some earlier version, and it seemed to work too, i.e. we will have an easy path to still generate vector graphics, if required. There are also way more *.lad files in the repository now for various protocol transaction, including supplementary services, roaming calls, etc. 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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