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Osmocom's Base Station Controller for 2G mobile networks https://osmocom.org/projects/osmobsc
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Neels Hofmeyr 56c91b09b1 hodec2: don't apply AFS bias to same-cell lchans 
The AFS bias actually should not apply to local cell lchans, because it
makes no sense for intra-cell considerations:

- same-cell lchans obviously have identical rxlev;
- any nonzero AFS bias thus always raises the TCH/F above the TCH/H;
- for intra-cell reassignment, the power budget hysteresis is,
  naturally, not applied.

So, before this patch, setting AFS bias even to only 1 would
unconditionally move all (AMR) TCH/H lchans over to free TCH/F lchans in
the same cell.

Recent patch Id40d1cf8b58410c7d4eb87407fe8b8106e352438 implements
explicit upgrade from TCH/H to TCH/F *if* the TCH/H is experiencing low
rxqual or low rxlev, as a proper replacement for intra-cell AFS bias.

Related: SYS#5198 SYS#5365
Change-Id: I315f24123ae016887ab91666870ce252e096f90f
 		2021-06-18 09:40:27 +00:00
contrib remove obsolete dependency on libosmo-sccp 2021-02-23 20:18:50 +01:00
debian remove obsolete dependency on libosmo-sccp 2021-02-23 20:18:50 +01:00
doc handover dot charts: fix wrong transitions regarding MGW 2021-05-27 17:06:21 +02:00
include Introduce counters to track SRVCC procedures 2021-06-17 14:05:40 +00:00
m4 move openbsc/* to repos root 2017-08-27 03:52:43 +02:00
src hodec2: don't apply AFS bias to same-cell lchans 2021-06-18 09:40:27 +00:00
tests hodec2: don't apply AFS bias to same-cell lchans 2021-06-18 09:40:27 +00:00
.gitignore gitignore: Ignore *~ 2021-01-07 18:33:36 +01:00
.gitreview .gitreview: update repo url to new location 2017-08-08 17:24:04 +02:00
.mailmap add .mailmap file for mapping git author name/mail in shortlog 2016-08-08 17:40:28 +00:00
AUTHORS move openbsc/* to repos root 2017-08-27 03:52:43 +02:00
COPYING move openbsc/* to repos root 2017-08-27 03:52:43 +02:00
Makefile.am manuals: generate vty reference xml at build time 2020-06-16 10:16:30 +00:00
README rewrite README 2017-09-06 16:25:09 +02:00
README.vty-tests Remove obsolete ./configure option 2018-01-02 12:53:11 +01:00
TODO-RELEASE ctrl: Introduce CTRL SET cmd to apply VTY cfg file 2021-05-24 22:05:49 +02:00
configure.ac remove obsolete dependency on libosmo-sccp 2021-02-23 20:18:50 +01:00
git-version-gen git-version-gen: Don't check for .git directory 2018-07-24 18:04:51 +02:00
osmoappdesc.py debian, osmoappdesc.py, tests: switch to python 3 2019-12-11 09:31:40 +01:00

README 

About OsmoBSC
=============

OsmoBSC originated from the OpenBSC project, which started as a minimalistic
all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached
maturity and diversity (including M3UA SIGTRAN and 3G support in the form of
IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one
approach to fully independent separate programs as in typical GSM networks.

OsmoBSC was one of the parts split off from the old openbsc.git. Before, it
worked as a standalone osmo-bsc binary as well as a combination of libbsc and
libmsc, i.e. the old OsmoNITB. Since the standalone OsmoMSC with a true A
interface (and IuCS for 3G support) is available, OsmoBSC exists only as a
separate standalone entity.

OsmoBSC exposes
- A over IP towards an MSC (e.g. OsmoMSC);
- Abis interfaces towards various kinds of BTS;
- The Osmocom typical telnet VTY and CTRL interfaces.

Find OsmoBSC issue tracker and wiki online at
https://osmocom.org/projects/osmobsc
https://osmocom.org/projects/osmobsc/wiki

OsmoBSC-NAT is a specialized solution to navigating RTP streams through a NAT.
(Todo: describe in more detail)