Hi all!
Since more people are currently looking into using OsmoSGSN, let me write
down some technical notes on its current status:
NS (08.16) implementation (BSS and SGSN side)
* complete + stable
* supports NS/UDP/IP and NS/FR/GRE/IP stacking
BSSGP (08.18) implementation
* no support for per-BSS/per-MS flow control yet, this is WIP
* otherwise complete and stable
LLC (04.64) implementation, network side
* No support for Async Balanced Mode (ABM), as to the best of
my knowledge, it is not used if IP is transported over GPRS
* Encryption stub functionality using external plugins for actual
GEA encryption. GEA3 reference code is published, but we cannot
redistribute it
* No full support for the XID mechanism yet
SNDCP (04.65) implementation
* Fragmentation/defragmentation implenented but not widely tested
* No full support for the XID mechanism yet
* No support for any of the header compression formats
* is optional anyway, but helps performance
* No support for V.42bis payload compression
* is optional anyway, but helps performance
GPRS Mobility Management (04.08) implementation
* Supports GPRS ATTACH, RA UPDATE
* Known bugs with inter-cell hand-over
* No access to HLR yet, i.e. all MS are permitted to enter
* No persistent storage of MM state, i.e. all state is lost
if process crashes or restart
* We don't yet work around a fairly common MS bug which makes
them try to do GPRS RA UPD without ever sending GPRS ATTACH first
GPRS Session Management (04.08) implementation
* Supports only one PDP Context per MS so far
* Only IPv4, no IPv6 contexts yet
* No persistent storage of active PDP contexts, i.e. all state
is lost if process crashes or restarts
* only supports one APN, routed to one single GGSN
The TODO list in order of priority is:
* Implement BSSGP flow control (per BSS and per MS)
* Fix MM state machine issues, make sure inter-cell hand-over of GPRS works
* Add access from SGSN to HLR (possibly using libosmo-{tcap,map}, maybe again
a quick sqlite database hack meanwhile
* Verify encrpytion support in LLC code
* Work on header/payload compression
I don't have a precise schedule yet for it. Anyone who wants to work on those
issues is of course much welcome.
Meanwhile, if you experience problems with GPRS, please take pcap files of
the A-bis, Gb and GTP links and send them to me, with a detailed description
of what goes wrong when. I'm happy to look at those issues and resolve them,
if I get sufficiently verbose bug reports.
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)
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)
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
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!
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
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!
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
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!
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!
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
