gmr

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51 discussions

S-Band Base frequency
by Peter Wallereres 09 Dec '20

09 Dec '20

Someone can tell me what the base frequency for s-band is, to calculate the arfcn. I found this info, but i am not sure what is ul/dl, and if the frequencies are correct. 2.170.000.000 - 2.200.000.000 1.980.000.000 - 2.010.000.000

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gmr-1-3g
by Peter Wallereres 09 Dec '20

09 Dec '20

Someone can give me some info how to use the gmr-1-3g branch for GmPRS? Thank you!

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gmr1_rach_scan
by Peter Wallereres 05 Dec '20

05 Dec '20

Hi, I try to use the gmr1_rach_scan flowgraph, but did not succeed. I am always getting this error: Traceback (most recent call last): File "/home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/apps/gmr1_rach_scan.py", line 22, in <module> from gnuradio import gmr1 ImportError: cannot import name gmr1 Anyone can help me how to compile and install correctly the needed blocks for the flowgraph? Thank you.

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Decoding example data with osmo-gmr
by Johann T. 22 Sep '20

22 Sep '20

Hi, I have been looking into the example data provided by Osmocom as shown in the link below. http://osmocom.org/projects/gmr/wiki/Example_Data I could reproduce the first pcap output (up to the Ciphering Mode Command) for the Voice call using the gmr1_rx_live from the live branch. With the provided Kc, I thought I would be able to reproduce the second pcap (including the call setup). I have modified the sa_tch3.c to include the Kc code. However, I am not able to get the results as shown in the second pcap file. I noticed that in the sa_tch3.c code, there is a ciphering part (marked by "Retry with ciphering") which was disabled. This part of code didn't compile as some variables were not defined. Probably my approach was not right. Any pointer here? Which code is needed to produce the second pcap (deciphered) file given the Kc is known? Many thanks in advance. Best regards, Johann

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OsmoDevCon / COVID-19
by Harald Welte 04 Sep '20

04 Sep '20

Dear fellow Osmocom developers, as you all know, we've sadly had to postpone OsmoDevCon 2020 back in April this year. At the time, we discussed to re-visit the situation in October 2020. While legally it is no problem at all to host an event with ~ 20 participants in Berlin/Germany (specific regulations really only start from 50+ participants) - I'm not entirely convinced it would be the smartest move. Legality and public health regulations are only one part of the equation - common sense and profound care for the key members of our community for sure are more relevant considerations to me. I'm not 100% in favour and not 100% against. Hence, I would like to get your input. Should we a) try to get an event organized on-site in Berlin? We'd have to move to a larger venue than IN-Berlin with proper ventilation and sufficient space so we can keep physical distance, but I think that's manageable for sysmocom as organizer. b) simply postpone to 2021? I'm convinced the situation will not change significantly (in a positive way) until late April 2021, so it's not really a "solution" as it will likely mean we have to think of late 2021 or 2022. c) plan some kind of online conference? To be honest, I think this model works fine for events where a single speaker wants to give lectures to hundreds or thousands of participants. But OsmoDevCon is much more interactive. We could record or live-stream some talks or screencasts from home, sure. But that only captures one part of the event. We could also try to set a date for a collaborative mumble, or the like - for the "hallway track". What are your thoughts? Let's avoid cross-posting the discussion to all of the mailing lists and simply have it on openbsc(a)lists.osmocom.org. Regards, Harald -- - Harald Welte <laforge(a)osmocom.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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Osmocom scheduled outage on *2020-07-19 9am CEST*
by Harald Welte 19 Jul '20

19 Jul '20

There is an urgent need to migrate our most important public infrastructure to a new server, and I will be doing that on *Sunday, July 19 2020*, starting about 9am CEST. The migration involves redmine (main osmocom.org website), jenkins, gerrit, git, and cgit. In theory, the migration should be quick. I would expect (significantly) less than one hour of downtime. However, we all know Murphys law. Services not affected are mail (including mailman lists), ftp, dns. So in case of doubt, we can still use mailing lists to communicate. In case anyone urgently needs osmocom source code on Sunday morning during the downtime: There are public mirrors available on github. Regards, Harald -- - Harald Welte <laforge(a)osmocom.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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GMR voice
by fe8769 08 Jul '20

08 Jul '20

hello in /tmp/ I have some .dat files like : /tmp/gmr1_speech_928_1_309814.dat . I think it is voice extract from arfcn 928 I tried ./gmr1_ambe_decode /tmp/gmr1_speech_928_1_309814.dat I have stout garbage I tried to review code in gmr1_ambe_decode.c to understand but I'm too bad is it the way it is working ? Thanks again --

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need some explaination
by fe8769 08 Jul '20

08 Jul '20

hello I need some explanations of the way it is working this line is working fine ./gmr1_rx_sdr.py --args airspy -a 927 -s 6000000 -B L -f 1553968750 -g 19 -b 40 then after ./gmr1_rx 4 /tmp/arfcn_927.cfile wireshark is giving all informations I have "immediate assignment on ARFCN 928 929 930 931 I tried to do the same with 928 929 930 931 ./gmr1_rx_sdr.py --args airspy -a 929 -s 6000000 -B L -f 1554031250 -g 25 -b 40 with 1 Gb of datas, I can retrieve only 2 frames in wireshark I'm sure there is traffic on these 4 channels Is "immediate assignment " means TCH3 and voice ? I tried all branches on git hub with same result What is usage of gmr1_process_recording.py ? and arguments What is usage of gmr1_ambe_decode and gmr1_rach_gen Thanks for help --

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Thuraya ARFCN
by Johann T. 04 May '20

04 May '20

Dear all, In the past weeks, I have been playing with the Osmocom GMR code. The code has been successfully compiled and installed. My intention is to listen to the broadcast channel of Thuraya in the Netherlands. There are two spotbeams for NL namely 288 and 289. As I am located at the border of the two beams, I have tried both options. So far I couldn't see anything decoded in Wireshark. I noted that the translation of ARFCN to frequency is slightly different in the formula by Driessen (Practical cryptanalysis of the real world systems) and in the ETSI standard (TS 101 376-5-5). There is a shift of half of the channel bandwidth (31.25 kHz). For your information, I am using Ubuntu 16.04, USRP B210, a wideband antenna and LNA with about 20 dBi gain on L-band. As mentioned by Sylvain in the mailing list, the gmr_multi_rx.py is obsolete. I am using the gmr1_rx_sdr.py for my tests. I ran the following commands (one each time) and with Wireshark listening to lo interface while applying the gmr1.bcch filter. Is this the right approach as I don't see anything show up so far? Did I overlook something here? Spotbeam 289 (ARFCN 1007) ./gmr1_rx_sdr.py -s 10000000 -B L -f 1556484375 -a 1007 -g 45 (Driessen) ./gmr1_rx_sdr.py -s 10000000 -B L -f 1556468750 -a 1007 -g 45 (ETSI) Spotbeam 288 (ARFCN 267) ./gmr1_rx_sdr.py -s 10000000 -B L -f 1533359375 -a 267 -g 45 (Driessen) ./gmr1_rx_sdr.py -s 10000000 -B L -f 1533343750 -a 267 -g 45 (ETSI) Comments or suggestions are much appreciated. Many thanks in advance. Best regards, Johann

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OsmoDevCon 2020 registration
by Harald Welte 01 Dec '19

01 Dec '19

Dear fellow Osmocom developers, I would like to invite all developers and contributors to Osmocom [sub]projects to register for OsmoDevCon 2020 (held on April 24th-27th, 2020 in Berlin). For details known so far, please check http://osmocom.org/projects/osmo-dev-con/wiki/OsmoDevCon2020 Please enter your name at https://osmocom.org/projects/osmo-dev-con/wiki/OsmoDevCon2020#Requested in case you would like to attend. Registering early allows proper planning. Thanks! Looking forward to meeting old and new Osmocom developers in April 2020. Regards, Harald -- - Harald Welte <laforge(a)osmocom.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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