gmr December 2020

gmr@lists.osmocom.org

2 participants
5 discussions

Few questions about Osmo-GMR
by Anton Minchev 25 May '21

25 May '21

Hello , last week i worked with osmo-gmr projest ,but still have some questions: 1. I need some more info about S band GMR - what sat is this , az / el , what trafic etc. 2. About gmr1 ambe decode - i tried about dozens of .dat files from gmr1 rx live , some give me ! codec errors , some not , but all .wav audio files are scrambled ,speesh is not recognized at all .. is there some clear traffic at all, or all is A5/2 coded ? 3. If all is scrambled where i may find offline tables / H n matrix/,any source that may generate them ? And if i have tables how they will be integrated with existing osmo-gmr ? I see gmr1_gen_mat that generates G/g matrix .. some more info about that .. .G and .g files seems so small .. Thanks in advance !

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rach
by Peter Wallereres 27 Dec '20

27 Dec '20

Dear list , i am still trying to compile the gnuradio blocks for the rach. But the building stops after 52%. Could it be that there is something wrong in the source code? Anyone else already succeeded to build the blocks? I am using Ubuntu 18.04.5 LTS, with gnu-radio 3.7, the compiler give me the following error: [ 52%] Building CXX object lib/CMakeFiles/gnuradio-gmr1.dir/gsmtap_sink_impl.cc.o /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/lib/gsmtap_sink_impl.cc: In constructor ‘gr::gmr1::gsmtap_sink_impl::gsmtap_sink_impl(const string&, uint16_t)’: /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/lib/gsmtap_sink_impl.cc:58:27: error: ‘PDU_PORT_ID’ was not declared in this scope message_port_register_in(PDU_PORT_ID); ^~~~~~~~~~~ /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/lib/gsmtap_sink_impl.cc: In member function ‘void gr::gmr1::gsmtap_sink_impl::send_pdu(pmt::pmt_t)’: /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/lib/gsmtap_sink_impl.cc:94:2: error: invalid conversion from ‘const uint8_t* {aka const unsigned char*}’ to ‘uint8_t {aka unsigned char}’ [-fpermissive] )); ^ /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/lib/gsmtap_sink_impl.cc:94:2: error: invalid conversion from ‘size_t {aka long unsigned int}’ to ‘const uint8_t* {aka const unsigned char*}’ [-fpermissive] /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/lib/gsmtap_sink_impl.cc:94:2: error: too few arguments to function ‘msgb* gmr1_gsmtap_makemsg(uint8_t, uint16_t, uint32_t, uint8_t, const uint8_t*, int)’ In file included from /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/lib/gsmtap_sink_impl.cc:34:0: /home/peter/Radio/Thuraya/sylvain-gr/osmo-gmr/gr-gmr1/../include/osmocom/gmr1/gsmtap.h:36:14: note: declared here struct msgb *gmr1_gsmtap_makemsg( ^~~~~~~~~~~~~~~~~~~ lib/CMakeFiles/gnuradio-gmr1.dir/build.make:309: recipe for target 'lib/CMakeFiles/gnuradio-gmr1.dir/gsmtap_sink_impl.cc.o' failed make[2]: *** [lib/CMakeFiles/gnuradio-gmr1.dir/gsmtap_sink_impl.cc.o] Error 1 CMakeFiles/Makefile2:254: recipe for target 'lib/CMakeFiles/gnuradio-gmr1.dir/all' failed make[1]: *** [lib/CMakeFiles/gnuradio-gmr1.dir/all] Error 2 Makefile:140: recipe for target 'all' failed make: *** [all] Error 2

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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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gmr December 2020