OpenBSC

openbsc@lists.osmocom.org

6 participants
4179 discussions

Some changes to the gsm_transaction data model
by Harald Welte 23 Jul '09

23 Jul '09

Hi! For finishing proper SMS support, I need supoprt for transactions. Similar to Call Control, SMS can also have a number of different transactions active of any time. Before my changes, the transactions were tied to call control, which is obviously not good if that code is to be reused from SMS. Also, the transaction was linked to the gsm_network as well as the gsm_lchan. I think both are somehow wrong. Why are they not a property of the network? Because a transaction always belongs to a 'MM entity' (gsm spec language), or a gsm_subscriber in openbsc terminology. That subscriber then is part of a gsm_network. And why are they not part of a gsm_lchan? Because a transaction can be initiated on one lchan and then move to another lchan, e.g. in case a SMS is sent just before a call is made, where we start on an SDCCH and might continue on a SACCH. I will keep the lchan pointer in the meaning of 'current lchan through which we transmit messages to the remote MM entity'. Tying the transaction to the subscriber neatly addresses both of those issues. Regards, -- - 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)

1 0

new to OpenBSC
by raza shah 23 Jul '09

23 Jul '09

Hi everyone, I am new to OpenBSC and I think the best way to contribute to it is to get to know the source code first. I would appreciate any help regarding how to begin understanding the source code. And what are the main features of the code? What is the best approach to start learning OpenBSC. And is there any good material on OpenBSC.? Thanks. _________________________________________________________________ Share your memories online with anyone you want. http://www.microsoft.com/middleeast/windows/windowslive/products/photos-sha…

3 2

Re: GSM license approval for HAR2009
by Dieter Spaar 23 Jul '09

23 Jul '09

Hello Harald, On Wed, 22 Jul 2009 23:49:00 +0200, "Harald Welte" <laforge(a)gnumonks.org> wrote: > > Even with two BTS at two TRX (exercising all our four ARFCN), the total call > capacity is not more than 13 simultanesous MS-to-MS calls (since each call > requires two timeslots). Yes we could do half-rate, but we have no software > support for that so far. You have the adjacent channels 121 to 124 for GSM 900 ? As far as I am aware, adjacent channels will disturb each other. From what I know, real networks usually have one free guard channel in between. So at least the configuration of using adjacent channels should be checked in advance (but you don't know how well different phones behave). Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

3 2

AW: mISDNdebugtool status
by Andreas.Eversberg 23 Jul '09

23 Jul '09

> can you comment on the status of mISDNdebugtool? As it seems, Eric is having > some problems using it. Also, in current mISDNuser.git (socket branch), > it doesn't compile since mISDNdebugtool.h is missing. hi, sorry for the late answer. i don't exactly know what this was for. i think it was used to debug the driver itself. to actually log frames from isdn interface and write a pcap file you need misdn_log. for logging first card use "misdn_log" or "misdn_log -c0". for writing pcap file use "misdn_log -c0 -w <file>" this connects to given isdn interface and shows transmitted data also. it must be started AFTER the application or it will set the mode to TE-mode. so first run bsc_hack, then start misdn_log. andreas

2 1

Re: GSM license approval for HAR2009
by Dieter Spaar 22 Jul '09

22 Jul '09

Hello Stefan, On Wed, 22 Jul 2009 19:36:16 +0200, "Stefan Schmidt" <stefan(a)datenfreihafen.org> wrote: > > Hmm, if we would calculate with 200 cards we would have ~80 USD costs for them. > Maybe not the baddest thing. Let's wait to what conclusion we come here before > going ahead. A technical solution that let the user handle the registration on > it's own is still my favorit. Sadly we can't estimate how many subscribers we > will get. :) I don't know if you get a better price if you buy such a large amount of the SIM cards, but I would ask. One advantage of handing out SIM cards: You can play with authentication and encryption if you want to. The A3/A8 algorithm in the SIM cards seems to be different from COMP128-V1 (at least with the SIM I tested) so you cannot retrieve Ki. However you could run the authentication in advance and record a few challenge-reponse pairs and use them later. And if you take one Euro as deposit for the SIM, you might get them back or don't care if not. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

1 0

Re: GSM license approval for HAR2009
by Dieter Spaar 22 Jul '09

22 Jul '09

Hello Stefan, On Wed, 22 Jul 2009 18:32:28 +0200, "Stefan Schmidt" <stefan(a)datenfreihafen.org> wrote: > > Hmm, another idea pops up into my mind right now. Any chance we can get a big > bunch of pre paid SIMs without money on the account? If we would get some 100s > of them we could prepare them in advance and just hand out to the people. Kai Muenz mentioned it on the list already, there are GSM SIMs available at http://www.dealextreme.com/details.dx/sku.16159. 10 pieces cost $US 3.94 including shipping. If you don't mind about a Chinese SIM Toolkit Menu which you can't read and also don't mind to remove a little bit of glue from some of the SIMs, they are fine for this purpose. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

2 1

Re: Spectrum analysis shows strange carrier
by Dieter Spaar 21 Jul '09

21 Jul '09

Hello Philipp, On Mon, 20 Jul 2009 20:19:16 CEST, "Dieter Spaar" <spaar(a)mirider.augusta.de> wrote: > > Not sure what you are measuring on peak one and two, but channel 123 > should be 959.6 MHz, this is most certainly the third peak. There might > be small signals (e.g. from the oscillator of the BS-11) on other > frequencies, but they should be much smaller than the main signal. In the meantime I did check with my spectrum analyzer. There is indeed a signal coming from the BS-11, even if nothing else is connected to the BS-11 (no serial connection, no E1). The signal starts to be emitted after the firmware download is complete. I could measure the signal at 942.4 MHz, the level is about -42 dBm (cable connection from the spectrum analyzer to TRX0, low-quality cable). The signal strength does not depend on the power amplifier setting, I wonder where it comes from (some internal oscillator working at that frequency ?). The signal is not very strong, so it should not cause major trouble (besides disturbing a weak signal which might be there from an "official" source if you are close to the BS-11). Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

2 1

Re: Spectrum analysis shows strange carrier
by Dieter Spaar 20 Jul '09

20 Jul '09

Hello Philipp, On Mon, 20 Jul 2009 18:39:47 +0200, "dexter" <zero-kelvin(a)gmx.de> wrote: > > We have a Toy-Spectrum-Analyser here, so i have measured the output of > our BS-11 when initalized with -f 123 > > http://www.root.runningserver.com/pub/openbsc_spektralanalyse.png > Not sure what you are measuring on peak one and two, but channel 123 should be 959.6 MHz, this is most certainly the third peak. There might be small signals (e.g. from the oscillator of the BS-11) on other frequencies, but they should be much smaller than the main signal. I don't know what the specification for a BTS allows as level for emitting on other frequencies, so I can't give you any numbers how strong those other signals can be. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

3 2

Spectrum analysis shows strange carrier
by dexter 20 Jul '09

20 Jul '09

Hi folks. We have a Toy-Spectrum-Analyser here, so i have measured the output of our BS-11 when initalized with -f 123 http://www.root.runningserver.com/pub/openbsc_spektralanalyse.png Why are there 2 carriers emitted by the BTS? I thought that openBSC uses only one TRX. I have verfied that the carrier must be emitted by the BTS. If i stop the BTS the carrier vanishes and the T-Mobile carrier comes through (much weaker, of cause) I have no explaination for this effect, can anyone give me a hint? regards Philipp

2 1

mISDNdebugtool status
by Harald Welte 17 Jul '09

17 Jul '09

Hi Andreas, since youre experience with mISDN is much better than mine, can you comment on the status of mISDNdebugtool? As it seems, Eric is having some problems using it. Also, in current mISDNuser.git (socket branch), it doesn't compile since mISDNdebugtool.h is missing. What we're trying to do is to generate pcap files that we can throw at wireshark. Thanks in advance, -- - Harald Welte <laforge(a)gnumonks.org> http://gnumonks.org/ ============================================================================ We all know Linux is great...it does infinite loops in 5 seconds. -- Linus

1 0

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

OpenBSC