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…cch demappers blocks

Add support for RACH bursts although they are not yet supported in the
receiver and control channel decoder blocks.

3GPP TS 45.002 version 15.1.0 Release 15
Table 3 : Mapping of logical channels onto physical channels (see subclauses 6.3, 6.4, 6.5)
Figure 8a: TDMA frame mapping for FCCH + SCH + BCCH + CCCH

Fixes the following tests:
qa_gsm_bcch_ccch_demapper.test_uplink
qa_gsm_bcch_ccch_sdcch4_demapper.test_uplink

Change-Id: Ia6b3070c1085bcdda6d98fd94a89c6e0982e2aec
fa184a9

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README.md

The gr-gsm project

The gr-gsm project is based on the gsm-receiver written by Piotr Krysik (also the main author of gr-gsm) for the Airprobe project.

The aim is to provide set of tools for receiving information transmitted by GSM equipment/devices.

Installation and usage

Please see project's wiki for information on installation and usage of gr-gsm.

Mailing list

Current gr-gsm project's mailing list address is following:

gr-gsm@googlegroups.com

Mailing list is a place for general discussions, questions about the usage and installation. In case of problem with installation please try to provide full information that will help reproducing it. Minimum information should contain:

  • operating system with version,
  • kind of installation (how gr-gsm and its dependencies were installed: with pybombs, from distibution's repository, compiled manually)
  • version of gnuradio (it can be obtained with: gnuradio-companion --version)
  • error messages (in case of pybombs installation they can be obtained after switching it to verbous mode with -v option).

To join the group with any e-mail address, use this link:

https://groups.google.com/forum/#!forum/gr-gsm/join

Development

New features are accepted through github's pull requests. When creating pull request try to make it adress one topic (addition of a feature x, correction of bug y).

If you wish to develop something for gr-gsm but don't know exactly what, then look for issues with label "Enhancement". Select one that you feel you are able to complete. After that claim it by commenting in the comment section of the issue. If there is any additional information about gr-gsm needed by you to make completing the task easier - just ask.

Videos

Short presentation of Airprobe'like application of gr-gsm:

https://www.youtube.com/watch?v=Eofnb7zr8QE

Credits

Piotr Krysik <ptrkrysik (at) gmail.com> - main author and project maintainer

Roman Khassraf <rkhassraf (at) gmail.com> - blocks for demultiplexing and decoding of voice channels, decryption block supporting all ciphers used in GSM, blocks for storing and reading GSM bursts, project planning and user support

Vadim Yanitskiy <axilirator (at) gmail.com> - control and data interface for the transceiver, grgsm_trx application

Vasil Velichkov <vvvelichkov (at) gmail.com> - automatic compilation of grc applications, fixes and user support

Pieter Robyns <pieter.robyns (at) uhasselt.be> - block reversing channel hopping

Thanks

This work is built upon the efforts made by many people to gather knowledge of GSM.

First very significant effort of public research into GSM and its security vulnerabilities was The Hacker's Choice GSM SCANNER PROJECT. One of the results of this project was creation of a software GSM receiver by Tvoid - gsm-tvoid - which was was the most important predecessor of gr-gsm and of gsm-receiver from the Airprobe project.

Gr-gsm wouldn't be also possible without help and inspiration by Harald Welte, Dieter Spaar and Sylvain Munaut.

Special thanks to Pawel Koszut who generously lent his USRP1 to the author of gr-gsm (Piotr Krysik) in 2007-2010.

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