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State of the HSL Femtocell support
by Harald Welte 15 Jan '11

15 Jan '11

Hi! Today I've done the first push of the 'laforge/hsl' branch, an attempt to support the HSL 2.75G Femtocell from OpenBSC. It is far from being complete, but you can get the BTS to start up on the right ARFCN and process location area updates and other signalling traffic. Voice support is still being worked on. To give you a quick overview of what you are dealing with: == Hardware == * Ti DaVinci TMS320DM6443A (ARM9 CPU + DSP) * Xilinx Spartan-3A FPGA (XC3SD1800A) * 128 MByte DDR-2 RAM * 128 MByte NAND flash * Realtek RTL8201 Ethernet MAC * Dual 12-bit 65Ms/sec ADC (ADS5232) * Dual 14-bit 275Ms/sec DAC (DAC5672) As you can see, the hardware is _much_ more powerful than you would ever need for a simple single-ARFCN femtocell. Using the high-speed DAC/ADC, the combined power of the FPGA (with DSP slices) and DSP, you can probably expect that they will at least want to do multi-ARFCN (if not 3G) on the same hardware at some later point. == Protocol == They use an odd down-sized minimalistic dialect of the ip.access Abis/IP. === ACS === Prior to connecting to the BSC, the cell downloads its current configuration via https, using a HTTP POST of its serial number. === IPA layer === The IPA multiplex layer does not have PING/PONG keepalives, and it does not do the ID_GET/ID_RESP/ID_CONF identification with the Unit ID. Furthermore, both OML and RSL are encapsulated in the same TCP connection. Stream identifier 0xDD is used for passing string debug messages from the BTS to the BSC. Neither OML nor RSL are implemented fully, as per 12.21 / 08.58 === RSL === It seems to have a very 'creative' interpretation of the RSL specification. Some examples: * use of SACCH INFO MODIFY instead of SACCH FILLING for default SI5/SI6 * it forgets to send RSL CHAN REL ACK on TS1...7 * it does not implement RSL CHAN MODIFY * it seems to be unable to run without DTX * it often detects RACH requests where there are none (!) === OML === OML is almost not present at all. Only software download and setting of ARFCN + BSIC are supported. No managed objects, no state transitions, no software activation procedures/events at all. The configuration of each timeslot seems to happen 'on demand', i.e. there are no OML commands to configure the timeslots, but it depends on your RSL CHAN ACT whether a timeslot will become a TCH/H or TCH/F. I have not managed to use a SDCCH/8 anywhere, just TCH/F and TCH/H as well as SDCCH/4. The BCCH _claims_ to be a Combination 4, but in reality it is a Combination 5 (i.e. including the SDCCH/4) === GPRS === GPRS is quiite odd, too. The BSSGP is encapsulated in the RSL L3_INFO_IE, this means we will have to run a NS link from the BSC to the SGSN, combining all the BSSGP links from HSL Femtocells to the BSC. -- - 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: Adding patches to wireshark...
by omar.atia＠its.ws 13 Jan '11

13 Jan '11

Dear Holger, Yes , I found two 1 location update reject and one location update accept .is this abis oml ? Thanks, Omar ------Original Message------ From: Holger Hans Peter Freyther Sender: openbsc-bounces(a)lists.gnumonks.org To: openbsc(a)lists.gnumonks.org Subject: Re: Adding patches to wireshark... Sent: Jan 11, 2011 11:37 PM On 01/11/2011 09:08 PM, Omar Atia wrote: > Thanks It is clear for me !! just send me 1 pcap file to open it with the > patched wireshark Hmm, who do you address with this request? Have you attempted to search for 'pcap' in the OpenBSC wiki? Sent via BlackBerry® from mtc touch

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multiBTS-problem
by Thomas Ansorg 12 Jan '11

12 Jan '11

hi all, the misdn driver is nice configured now(dmask=0x00020002, bmask=0x0000fffc,0xfffc0000), but i get the error message "could not bind l2 socket Invalid argument". the full output is: 2 devices found id: 0 Dprotocols: 00000018 Bprotocols: 0000000e protocol: 4 nrbchan: 14 name: hfc-e1.1-1 activate bchan activate bchan 2 devices found id: 1 Dprotocols: 00000018 Bprotocols: 0000000e protocol: 4 nrbchan: 14 name: hfc-e1.1-2 could not bind l2 socket Invalid argument bts1 (connected to the pc) is configured port 0 ts 1 tei 25 in multidrop config bts2 is configured port 1 ts 6 tei 26 in line config any ideas? -- Wer Rechtschreibfehler findet, darf sie behalten!

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AW: multiBTS-problem
by Andreas.Eversberg 12 Jan '11

12 Jan '11

your first port has the following slots: d=1, b=2-15 your second port has the following slots: d=16, b=17-31 did you set the timeslots in osmocom.cfg according to your second port? > the misdn driver is nice configured now(dmask=0x00020002, > bmask=0x0000fffc,0xfffc0000), but i get the error message "could not

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dmask and bmask settings
by Thomas Ansorg 12 Jan '11

12 Jan '11

hello the misdn driver runs, but it seems im doing something wrong with the parameter. i have 2 bs-11, means i need 2 d-channels, right? i took the config from the hfcmulti.c-helptext which seemed sensible: d-channels on slot 1 and 17, the rest except 16 b-channels. i tried "modprobe hfcmulti dmask=0x00020002 bmask=0x0000fffc,0xfffc0000" but that doesnt seem to work. T. -- Wer Rechtschreibfehler findet, darf sie behalten!

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VTY-command "drop bts connection"
by Luca Bertoncello 12 Jan '11

12 Jan '11

Hi, list! I need to restart the communication between the BTS and OpenBSC, in order to change some parameters. I think, I have to use the command "drop bts connection BTS oml". Unfortunately, I can't find this command in the VTY... I see in the code (vty_interface.c), that it is defined for the VIEW_NODE, but I can't find it in the VTY. Need I vacancy or have I to switch to some other VTY-menu? 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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AW: mISDN config problem
by Andreas.Eversberg 12 Jan '11

12 Jan '11

hi thomas, see help inside mISDN/drivers/isdn/hardware/mISDN/hfcmulti.c dslot is now "dmask" and "bmask". you can structure your card using masks now. regards, andreas -----Ursprüngliche Nachricht----- Von: openbsc-bounces(a)lists.gnumonks.org [mailto:openbsc-bounces@lists.gnumonks.org] Im Auftrag von Thomas Ansorg Gesendet: Dienstag, 11. Januar 2011 17:10 An: openBSC-Mailingliste Betreff: mISDN config problem hello i was succesfull in building the 2.6.31.3 kernel in order to install a new misdn driver. the tar file is git-11ae851f95a3f795d6f8caa26e889f2426dd93f1.tar.gz. after configuring, make and installing, bsc_hack reported 3 recognized devices. fine! but after restarting, lsmod said, no hfcmulti is loaded. modprobe hfcmulti didn't work. dmesg said: [ 4752.384476] base_sock_release(f6ddd500) sk=f73be000 [ 4763.947599] hfcmulti: Unknown parameter `dslot' what did i forget? T. -- Wer Rechtschreibfehler findet, darf sie behalten!

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mISDN config problem
by Thomas Ansorg 11 Jan '11

11 Jan '11

hello i was succesfull in building the 2.6.31.3 kernel in order to install a new misdn driver. the tar file is git-11ae851f95a3f795d6f8caa26e889f2426dd93f1.tar.gz. after configuring, make and installing, bsc_hack reported 3 recognized devices. fine! but after restarting, lsmod said, no hfcmulti is loaded. modprobe hfcmulti didn't work. dmesg said: [ 4752.384476] base_sock_release(f6ddd500) sk=f73be000 [ 4763.947599] hfcmulti: Unknown parameter `dslot' what did i forget? T. -- Wer Rechtschreibfehler findet, darf sie behalten!

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Re: Adding patches to wireshark...
by omar.atia＠its.ws 11 Jan '11

11 Jan '11

Tomorrow I will do search on the on openbsc wiki , I have to sleep now good night . Thanks again, Omar atia Sent via BlackBerry® from mtc touch -----Original Message----- From: omar.atia(a)its.ws Date: Tue, 11 Jan 2011 20:45:37 To: Holger Hans Peter Freyther<holger(a)freyther.de>; <openbsc-bounces(a)lists.gnumonks.org>; <openbsc(a)lists.gnumonks.org> Reply-To: omar.atia(a)its.ws Subject: Re: Adding patches to wireshark... Dear Holger, Yes , I found two 1 location update reject and one location update accept .is this abis oml ? Thanks, Omar ------Original Message------ From: Holger Hans Peter Freyther Sender: openbsc-bounces(a)lists.gnumonks.org To: openbsc(a)lists.gnumonks.org Subject: Re: Adding patches to wireshark... Sent: Jan 11, 2011 11:37 PM On 01/11/2011 09:08 PM, Omar Atia wrote: > Thanks It is clear for me !! just send me 1 pcap file to open it with the > patched wireshark Hmm, who do you address with this request? Have you attempted to search for 'pcap' in the OpenBSC wiki? Sent via BlackBerry® from mtc touch

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Adding patches to wireshark...
by Omar Atia 11 Jan '11

11 Jan '11

Dears, Can you explain how to add packages to wire shark ? I quoted the following : A-bis OML dissector¶ <http://openbsc.osmocom.org/trac/wiki/PacketDump#A-bisOMLdissector> To add a dissector for the GSM 12.21 A-bis Organization and Maintenance Layer (OML), you can use the abis_oml.patch file from the wireshark directory of our git repository. This will be submitted for inclusion into wireshark soon. From http://openbsc.osmocom.org/trac/wiki/PacketDump is the above updated on the latest apt-get install wireshark , or we need to get the sources and apply the patch !!! plz let me know how ? Omar Atia TPSG Functional Consultant ITS Logo.png T. + (961) 9 641555 ext. 416 M. + (961) 3 001294 F. + (961) 9 641555 ext. 217 degital signeture.pngE. <mailto:omar.atia@its.ws> omar.atia(a)its.ws

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