Hi,
The osmocom software that I do not install via apt but build myself gets
installed in $HOME/usr and I do things like:
export PATH="${PATH}:${HOME}/usr/bin"
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${HOME}/usr/lib"
export PKG_CONFIG_PATH=$HOME/usr/lib/pkgconfig
MANPATH="${MANPATH}:${HOME}/usr/man"
Therefore I don't have to install to a destination outside my home
directory which in turn means I can avoid some sudo calls.
But that actually does not matter so much, you can mentally substitute
$HOME with '/' and append '/local' in the following if you want.
I don't install to $HOME/usr directly but use stow for 'managing' the
installations, so an installation goes like this:
$ mkdir -p $HOME/src/telco/osmo/libosmo-abis
$ cd $HOME/src/telco/osmo/libosmo-abis
$ git clone git://git.osmocom.org/libosmo-abis
$ autoreconf -i
$ ./configure --prefix=$HOME/usr/stow/libosmo-abis
$ make
$ make install
$ STOW_DIR=$HOME/usr/stow stow libosmo-abis
This has two advantages:
* Good visibility of what is installed by a package.
$ tree $HOME/usr/stow/libosmocore
* Possibility of uninstalling a package even if the Makefile is not
present.
For me those two advantages outweigh the small additional effort of
using stow.
Because of that workflow I sometimes run into situations in which make
runs fail because either header files are not found during compilation
or libraries are not found during linking. The reason is that autotools
variables pointing to pkgconfig supplied directories point to a
destination under the prefix path with which configure was called. If a
dependency was not mentioned in a Makefile.am the required files are not
found because the other dependencies are in other directories.
For a system on which the osmocom-own dependency libs are installed in
distinct directories, current openbsc master HEAD requires the attached
patch for a build to succeed.
I admit that in most situations the dependencies are installed in the
same directory so this does not matter, but it is still a small bug.
Therefore I propose to modify the jenkins build scripts so that they use
distinct, stow managed directories for the dependencies. That should
help to detect oversights, although admittedly developers would have to
adapt their workflows to use stow as well in their daily hacking.
Otherwise an oversight would be detected by jenkings and not locally
which in turn would require additional cleanup commits which is not so
nice.
What is your gut feeling? Does the increased correctness of Makefiles.am
contents justify the (IMO rather small) additional effort of using stow?
Kind regards,
-Alex
Hi.
I'm troubleshooting peculiar use case with packet access and osmo-bts-trx. There are
2 options for ME to acknowledge reception of control packet to PCU according to 3GPP
TS 44.060 § 11.2.2:
1) Packet Control Acknowledgement message
2) 4 identical access bursts
The latter can be both 8-bit RACH and 11-bit RACH (not supported by osmo-bts-trx
yet). The choice of response format is defined by OpenBSC in SI: 1) is default, 2)
can be activated with "gprs control-ack-type-rach" option.
The problem is that I don't understand how 2) will be handled by OsmoTRX? Shall I
expect 4 consecutive RACH messages via rx_rach_fn() in scheduler_trx.c in
osmo-bts-trx? Shall it be some other message/function? Will it be ignored/dropped
altogether by OsmoTRX?
--
Max Suraev <msuraev(a)sysmocom.de> http://www.sysmocom.de/
=======================================================================
* sysmocom - systems for mobile communications GmbH
* Alt-Moabit 93
* 10559 Berlin, Germany
* Sitz / Registered office: Berlin, HRB 134158 B
* Geschaeftsfuehrer / Managing Director: Harald Welte
Hi All,
I wrote a GSM signal generator application based on osmo-trx. The new
osmo-siggen allows random GSM or EDGE burst generation without using
special configurations of osmo-trx or the socket control interface.
Frame trigger output through GPIO is also available.
I use the application for testing modulation parameters and other PHY
level testing. Hopefully it's useful to other developers beyond
myself.
$ ./osmo-siggen -h
Options:
-h, --help This text
-a, --args UHD device args
-l --log Logging level ('err', 'warn', 'notice', 'info', 'debug')
-b, --burst Burst type ('normal', 'access', 'freq', 'sync', 'edge')
-r, --ref Frequency reference ('internal', 'external', 'gps')
-f, --freq Tx RF frequency
-g, --gain Tx RF gain
-s, --sps Tx samples-per-symbol (only 4 supported)
-m, --mod GSMK modulator type ('laurent4', 'laurent2', 'laurent1', 'nco')
-p, --ampl Tx amplitude (0.0 - 1.0)
-o, --offset Baseband frequency offset
-t, --tsc Normal and EDGE burst training sequence (0-7)
-S, --swap Swap channels
Currently osmo-siggen is located in the below branch. I've tested
solely with B210. C++14 availability is also required for now.
git://git.osmocom.org/osmo-trx ttsou/siggen
-TT
Hi all,
I was wondering if it is possible to generate a TDMA frame sync output
on a GPIO line of a USRP device (and/or any other SDR supported by
osmo-trx). This way it would be much easier to do e.g. BER testing
by using a pure waveform/pattern generator for the "MS side". Such
devices (Like an E4433B) can only generate the uplink bursts with
pseudo-random sequence, but they don't have any receiver, so they're not
able to receive the downlink from the BTS in order to lock on the TDMA
frame and transmit the uplink in sync to that.
There are of course specialized devices (CMU-300, ...) or hardware
options that add such receivers for synchronization on the signal
generators, equipment side, but why go there if there would be an easy
way to generate some kind of a frame sync output.
I would appreciate to know even if there's a way to introduce such
"synchronous GPIO toggles" or the like in the command stream to UHD
devices. If that existed, it should be rather simple to insert those
whenever a new burst for TS0 is sent.
A rather computationally (and bandwidth) expensive other option might be
to use the second RF output to generate such a signal, but I was hoping
not having to abuse the 2nd channel for that ;)
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)
hello everyone ......
anyone doingwith rbs2308 ? i am doing with dhai and E1 interface but it doesn't come to operational mode ....if anyone got any output from rbs 2308 pls let me
thanks
rajitha
People keep posting images to this list. I saw that mailman allows to remove
image attachments by file suffix and/or by mime type. I suggest we put jpg,
png, bmp on the list of attachments to remove.
AFAICT there was zero need for a legitimate image post, and if we'd want to we
can always create a wiki page or redmine ticket and attach the image there.
It would be nicer to bounce messages with such attachments completely, but
dropping the attachments is the next best thing.
Opinions?
I don't have access to the list admin, so (if we agree) someone else would need
to effect this / give me the pw:
mailman admin / "MIME-/HTML-Filter" / tick 'yes' on top and add image suffixes
to the reject list
~N
Hello,
In the Netherlands the free gsm channel for private gsm networks is;
1875 - 1879,9 MHz 200 mW e.r.p. 200 kHz
875 - 1879,8 MHz 50 mW/MHz e.r.p. ≤4,5 MHz
But I am a little bit confused as to how to set up an ipacces nanobts with
those frequencies
In OsmoBTS configuration file find bts 0 and set band to GSM1800
Also set frequencies to right value arfcn
The example says (
https://osmocom.org/projects/openbsc/wiki/Multi-BTS_with_handover)
trx 0
rf_locked 0
arfcn 74
...
trx 1
rf_locked 0
arfcn 84
---------------
I am not sure what to put at arfcn as the correct frequency with the
mentioned frequency..
A second question, the nanoBTS comes in 1800 for GSM1800, and GSM1900
variant thereof (almost identical hardware)
Well I can get 2 of the 1900 version very cheap from the USA but setting
the configuration file bts 0 band GSM1800 won´t change the frequeny of the
1900 model to 1800MHz?
Or can I only use the 1900 version in the free 1900MHz DECT frequency range?
I have attached the official document of the Dutch regulatory body with the
allowed frequencies, see page 28 for DECT frequencies in 1900 band and page
29 for picocell frequencies in the 1800 band.
To me it seems both bands 1800 and 1900 are allowed, 1800Mhz is the
official private gsm but for testing purposes using a 1900 model on the
DECT band should be ok to.
If the nanobts 1900 US model could also operate on the 1800 band that would
be even better.
Thanks, Albert
In our osmo-gsm-manuals, there are various code listings that one would like to
copy-paste from the PDF. That would theoretically work, but practically, the
'DRAFT' watermark in the backdrop confuses the text marking, hence making
copy-pasting some text from the manuals very very cumbersome. Though I'm not
that sure why we need a 'DRAFT' watermark in an open source manual (it's
implicitly a draft), I am fine with having such a marking.
But I would like the marking to be less obtrusive. We could experiment with
putting a bitmap image in the backdrop instead of text, or even better IMHO
would be to put it in the page header next to the version.
We could also add a generic "DRAFT" disclaimer near the beginning of each
document.
(Same goes for the sysmocom internal manuals, for which it isn't so easy to get
the asciidoc source to paste from.)
Any opinions on this?
~N
Hi,
I just looked into a build breakage when --disable-static is passed. The
first failure is because of:
libosmo_sigtran_la_LDFLAGS = -version-info $(LIBVERSION) \
-no-undefined \
-export-symbols-regex '^osmo_'
The testcases use xua_* sua_ symbols but they are not exported. Shall
we export them or shall we forbid --disable-static on libosmo-sccp?
The second part is that I had preferred the sccp library to be static
only to avoid having to do proper ABI checking/versioning. If we fix
the above, maybe we have to fix this part too?
holger
