commit | ebdf3dcac793c77be5d511ac1aee50b618434791 | [log] [tgz] |
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author | Andreas Eversberg <jolly@eversberg.eu> | Fri Nov 24 16:52:21 2023 +0100 |
committer | laforge <laforge@osmocom.org> | Mon Nov 27 16:27:32 2023 +0000 |
tree | 60863ebe6cbf0654479935bb9c266b6ff4af3cd7 | |
parent | 6cc5301e4cccba1021f168b4083bc44760b9db6d [diff] |
coding: gsm0503_tch_{afs,ahs}_encode(): add ability to emit BFI Similar to Change ID Iade3310e16b906efb6892d28f474a0d15204e861, add BFI support to TCH AFS and TCH AHS encoder. Every BTS needs to have some graceful handling for the scenario where it is time to send out a speech frame on TCH DL, but there is no frame to be sent. One possible solution is to transmit dummy FACCH, but this option is unattractive for TCH/AHS where FACCH displaces two speech frames rather than one. A more elegant solution is to emit a speech frame with inverted CRC6, causing the MS receiver to declare a BFI condition to trigger substitution and muting procedure. Setting all u(k) bits to 0 is one way to produce such an inverted-CRC speech frame (normal TCH FR/HR CRC6 for an all-zeros frame would be 111111). This patch adds the abiliy to gsm0503_tch_{afs,ahs}_encode() functions, indicated by payload length of 0. See ยง6.2 of 3GPP TS 26.191 for substitution and muting procedure. Related: OS#6049 Change-Id: I82ce2adf995a4b42d1f378c5819f88d773b9104a
This repository contains a set of C-language libraries that form the core infrastructure of many Osmocom Open Source Mobile Communications projects.
Historically, a lot of this code was developed as part of the OpenBSC project, but which are of a more generic nature and thus useful to (at least) other programs that we develop in the sphere of Free Software / Open Source mobile communications.
There is no clear scope of it. We simply move all shared code between the various Osmocom projects in this library to avoid code duplication.
The libosmocore.git repository build multiple libraries:
The official homepage of the project is https://osmocom.org/projects/libosmocore/wiki/Libosmocore
You can clone from the official libosmocore.git repository using
git clone https://gitea.osmocom.org/osmocom/libosmocore
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Doxygen-generated API documentation is generated during the build process, but also available online for each of the sub-libraries at https://ftp.osmocom.org/api/latest/libosmocore/
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