I tried to install CalypsoBTS have libosmocore installed, osmo-bts osmobsc,
libosmo-netif, libosmo-abis, ortp, trx, libosmo-dsp everything went without
errors, following the instructions I created: touch ~/.osmocom/open-bsc.cfg
, then when you run : osmo-nitb -c ~/.osmocom/open-bsc.cfg-l
~/.osmocom/hlr.sqlite3-P-C --debug=DRLL:CC:MM:RR:RSL:NM shows me:<0005>
bsc_init.c:498 Failed to parse the config file:
'/root/.osmocom/open-bsc.cfg' file tried to create as administrator but
without success , pleas help me
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Hi,
We have been working on the handover feature in OsmocomBB and have
managed to make some progress including SB/BSIC detection in dedicated mode
which was not previously being successfully done in firmware. I wanted to
share it and seek guidance on the last bit of handover implementation on
which we are stuck. I hope someone would be able to help us or make use of
our work.
We took code related to handover from the osmocom-bb jolly branch by
manually adding/deleting stuff in the master branch as updating to the
latest copy was giving us issues. We added code from the “Safely change TPU
offset on TS change or sync change” commit till the “Use only sel_si for
information about the current cell” commit. Using the handover code in the
jolly branch and after making the changes explained below we were able to
obtain the handover command from the BTS. The synchronized handover case
works sometimes though still not every time, however the non-synchronized
case doesn't work at all as we are not able to get the physical information
command from the new cell. I'll explain the changes/additions we made to
achieve this.
Firstly, we noted that in dedicated mode SB burst was not being detected.
Changes were required at three main places in order to correctly perform
FB/SB detection:
- It was seen that the results for SB were being read from DSP API location
dsp_api.db_r->a_sch which is for the idle mode. The results had to be read
from the dsp_api.ndb->a_sch26 location for the dedicated case if
TCH_SB_DSP_TASK is used.
- After reading the FB we needed to update the quarter-bit offset of the
TPU using the TOA of the FB to sync it with the start of frame of the
neighbour cell in order to catch the SB (by changing the vaule of
l1s.tpu_offset using the TOA of the FB).
- Frequency compensation needed to be performed using the afc_correct
function before reading the SB.
* We actually kind of cheated a bit by adding 3 frames to the original idle
frame in order to give us more time to perform FB/SB detection including
the synchronizations mentioned above. This was because we weren't that
proficient with the code and someone with more understanding could do this
better. The call did not get dropped. We used the initial added “idle”
frame to perform the quarter-bit and frequency compensation which was
reversed in the idle frame with the response function to tune back to the
serving cell.
These things, when added to the code did the trick and BSIC of the
neighbours was obtained.
Once the BSICs were decoded the measurement report sent to the BTS became
meaningful and the handover command was received. Upon receiving handover
command, access bursts needed to be sent on the new channel which again was
not currently being implemented properly as in order to tune to the new
cell we needed to know its quarter-bit offset for start of frame, frequency
compensation and absolute frame number which were not previously being
obtained. Now that we were able to detect FB and SB these values were
stored for the neighbours following detection of these bursts and were used
to tune to a neighbour cell in case of a handover to it before the sending
of access bursts. However, here is where we are stuck. We were expecting a
physical information message following the access bursts but were not able
to receive it due to which the handover failed. If only that could be
achieved we believe handover should be successful.
Either we are not syncing properly to the new cell or we might not be
following GSM protocol properly. We also might not be reading the FACCH
properly for physical information message after tuning to the new cell as
we couldn't really understand that bit very well. We wanted someone
expertise on this matter and were hoping our work could be of use. We were
more interested in getting the work done first up.
Best Regards,
M. Awais Aslam
Hi,
the lua binding code was added to be able to automate OpenBSC tests. In theory we should be able to do this for SMS and UpdateLocation (call handling with MNCC exposing is left as a todo) but in practice we miss a piece of software to coordinate this and run the test. We miss it because it is an interesting problem but also I lost time on switching countries, learning new tricks at a project...
The basic testing structure looks easy as well. We want to define the number of concurrent subscribers (0, 10, 100, 1000, n) and to make it simple a single test (UL, send SMS, t) and execute the same test for each subscriber and call it a success if y% of tests succeed within time T. The way to measure this is easy as well. The lua script would print some data (e.g. the name of the ms) when it starts and completes.
For some degrees of freedom I don't have a good idea.. and feedback is welcome.
I am not sure if I should spawn, configure, add subscribers, a flavor of Osmocom cellular? I look into having some set of templates for the config, the stack to launch and in concept it looks awfully similar to something the GSM tester is doing. Shall we leave virtbts/cellular to the Osmocom tester and just focus on coordinating mobile? My feeling is to leave this to the Osmo GSM tester.
If we have n subscribers I would launch m copies of "mobile" (but run multiple MS in a single binary). So with 4 MS per mobile process and 10k subs we would end with 2.5k processes + many log messages coming from each. Would that scale with python? Should we look into doing this one in Go? Or can some of GSM tester be used (the template part)? I would probably design this concurrently with Go(besides being the first).
any ideas/comments?
holger
Hello! I Need Help
I install these three programs OpenBTS, OsmocomBB, Asterisk
Then run them, Everything works well
OpenBTS sent an SMS to my phones
I answered and he checked me
I registered into OpenBTS a second phone
I tried to transfer SMS between phones - all good
but when I try to call from one to another I did not get
Asterisk writes
================================================================
*CLI> Retransmission timeout reached on transmission 755803415(a)127.0.0.1 for
seqno 179 (Critical Response) -- See
wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 32001ms with no response
================================================================
Why?
What do I do?
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Hi everyone,
I few days ago, during some usual R&D process, I noticed the following
messages, appearing in the log output of OsmocomBB/mobile application:
"ACCH message type 0xXX unknown."
The network, a phone was connected to, was may own and based on more
or less recent versions of OsmoNiTB, OsmoBTS, and OsmoTRX. Despite I
used to see such messages before, I didn't pay too much attention.
But this time I've decided to figure out, what's wrong there...
The source of such messages is the gsm48_rr.c / gsm48_rr_rx_acch():
static int gsm48_rr_rx_acch(struct osmocom_ms *ms, struct msgb *msg)
{
// ...
struct gsm48_system_information_type_header *sih = msgb_l3(msg);
// ...
switch (sih->system_information) {
case GSM48_MT_RR_SYSINFO_5:
return gsm48_rr_rx_sysinfo5(ms, msg);
case GSM48_MT_RR_SYSINFO_5bis:
return gsm48_rr_rx_sysinfo5bis(ms, msg);
case GSM48_MT_RR_SYSINFO_5ter:
return gsm48_rr_rx_sysinfo5ter(ms, msg);
case GSM48_MT_RR_SYSINFO_6:
return gsm48_rr_rx_sysinfo6(ms, msg);
default:
LOGP(DRR, LOGL_NOTICE, "ACCH message type 0x%02x unknown.\n",
sih->system_information);
return -EINVAL;
}
}
To get I bit more details, I modified this function to print the
whole L3 payload, and got some interesting results. As it turned
out, the payloads were shifted one byte left - there was no
'l2_plen', which is assumed by:
/* Section 9.1.3x System information Type header */
struct gsm48_system_information_type_header {
uint8_t l2_plen;
uint8_t rr_protocol_discriminator :4,
skip_indicator:4;
uint8_t system_information;
} __attribute__ ((packed));
So, my first idea was that this is a bug of OsmocomBB, that
would be fairly easy to fix, so after a quick look at the
GSM 04.08 specification I wrote (and merged :/) this:
https://gerrit.osmocom.org/#/c/5204/
And everything was great, until I connected a 'patched' mobile to
a commercial mobile network... And all SI messages during a
dedicated connection were false-identified as SI5ter. This seemed
strange to me, so I decided to compare a SI message from commercial
network with a message captured in my own one:
https://habrastorage.org/webt/t8/zs/vv/t8zsvvjjglzfisnjqlnnsy4kgas.png
And this confused me even more, then I've expected. Why there is 0x49?
Wireshark false-identified this message as something related to SMS...
What if this is exactly the 'l2_plen' assumed in OsmocomBB before?
I looked at the specifications again, and found out that initially I
refered an outdated 5.3.0 version, which was the first link in Google:
http://www.etsi.org/deliver/etsi_gts/04/0408/05.03.00_60/gsmts_0408v050300p…
while the latest one is 7.21.0:
http://www.etsi.org/deliver/etsi_ts/100900_100999/100940/07.21.00_60/ts_100…
So, I compared the 9.1.37-40 sections of both versions, and bingo!
In the higher version ACCH System Information messages do have the
'L2 Pseudo Length' (10.5.2.19) field.
Finally, what I've learned:
- OsmocomBB / mobile follows the new version here (with l2_plen);
- OsmoNiTB generates the ACCH SI messages without the l2_plen;
- Recent Wireshark versions fail to decode the ACCH SI messages
with l2_plen, while older ones are able to do that;
- I should not merge the changes so quick.
My questions are:
- Which way of composing the SI messages is correct?
- If both are correct, how to parse them correctly?
- Should we change OsmoNiTB / OsmoBSC to follow the latest specs?
And of course, I have to revert the change I've merged.
With best regards,
Vadim Yanitskiy.
Hi Vadim,
while playing with fake_trx and trxcon I was wondering about the port
numbers you used.
I think it's not the best idea to re-use the same port numbers / port
number range on the MS side which are used on the network side. Is
there any requirement to do so? why not simply shift the entire base
port (5700) on the client side to something else like 6700?
(Side note: The entrire TRX protocol using so many non-standard/non-IANA port
numbers, not containing any version numbers for extensions, etc. is a mess,
but that's for a separate discussion altogether. Would love to re-do
this from scratch at some point)
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)
Sorry for the premature mail posting. I did some more digging and found a quite good thread of information from around 2011 or so.
http://baseband-devel.722152.n3.nabble.com/Mediatek-MT6235-status-Sciphone-…
I note that Harald mentioned whether Marcin had suitable lab equipment and I was starting to wonder this as well. Harald, you suggested Racal 6103 or similar, spectrum analyzer/scope up to 900/1800/1900 MHz. I'm wondering if you have any more current recommendations for equipment. I would imagine I might use an RTL-SDR possibly to receive/monitor TX. I see Racal 6103 devices for around $100 on ebay so I could get one of those if need be.
So I found the uboot sources and looked through and see board/mtk/sciphone_g2/mt6140.c which has the rf_tx <arfcn> uboot command. So I'll check fernvale/mtk6260 and see if similar code could be made for fernvale.
-Craig
On Thu, Feb 15, 2018 at 06:38:50PM +0000, pespin [REDMINE] wrote:
> So we now have the patches reviewed (+2) but due to the branch being old and having no jenkins.sh, Jenkins Builder set validate -1, and I'm not able to merge it. Help on how to fight against gerrit is required here.
I could manually override the V-1 and set it to V+1.
However, I guess the better solution would be to first merge a patch
that adds jenkins.sh to the respective branch, and then re-trigger the
validation of those patches. This way we would have a working solution
even for future patches.
Or even better: Rebas those old but still relevant branches on top of
current master, and they would get the jenkins.sh and associated build
verification for free.
Do we have any volunteers for this?
--
- 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)
Hello,
I have several of these devices now and am working on porting fernly code for the fernvale board (and other mtk626x devices) to osmocom-bb.
I found this document: https://elinux.org/images/9/9a/Getting_the_First_Open_Source_GSM_Stack_in_L…
and was wondering about the "GSM RF chips slide" which seems to indicate that you may have written RF HW drivers enough to transmit?
I don't see the u-boot sources from the links at https://osmocom.org/projects/baseband/wiki/SciphoneDreamG2 but interestingly I can get to them directly with git. :)
git clone git://git.osmocom.org/uboot-mt623x.git
So I will take a look at what you have and see if I can get somewhere with these devices.
If you have any suggestions please let me know.
Cheers,
Craig