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Osmocom Base Transceiver Station (BTS) https://osmocom.org/projects/osmobts
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Alexander Chemeris ba216b82f6 rsl: Output RTP stats before closing the socket. 
It's useful to know RTP statistics (number of packets lost, jitter, etc)
when looking at voice call quality issues. Right now this information is
not avialable anywhere and this looks like the best place to start.
 		2016-04-25 20:04:14 +02:00
contrib jenkins: Add the build script from jenkins here 2016-04-13 19:35:32 -04:00
debian debian: Create initial packaging for the osmo-bts-trx 2016-04-01 17:01:54 +02:00
doc octphy: add example configuration with 2 trx 2016-03-18 15:43:56 +01:00
include octphy: fix for multiple trx with more than 1 dsp 2016-03-21 17:20:11 +01:00
src rsl: Output RTP stats before closing the socket. 2016-04-25 20:04:14 +02:00
tests port sysmobts to phy_link/phy_instance abstraction 2016-02-15 14:18:59 +01:00
.gitignore misc: Ignore files generated by a debian packaging build 2016-04-01 17:02:11 +02:00
COPYING re-work original osmo-bts with support for sysmocom femtobts 2011-06-27 11:25:35 +02:00
Makefile.am misc: Attempt to fix make distcheck and dumping docs 2016-03-15 20:09:49 +01:00
README update README to bring it more in sync with reality. 2015-08-21 02:30:24 +02:00
configure.ac LC15: configure.ac: Allow specifying an alternate include-dir 2016-02-15 14:26:51 +01:00
git-version-gen auto-generate a version 2011-09-07 21:28:27 +02:00

README 

Repository forw the Osmocom BTS implementation.

This code implementes the Layer 2 and higher of a more or less
conventional GSM BTS (Base Transceiver Station) - however, using an
Abis/IP interface, rather than the old-fashioned E1/T1.

Specifically, this includes
 * BTS-Side implementation of TS 08.58 (RSL) and TS 12.21 (OML)
 * BTS-Side implementation of LAPDm (using libosmocore/libosmogsm)
 * A somewhat separated interface between those higher layer parts
   and the Layer1 interface.

Right now, only one hardware and Layer1 are supported:  The sysmocom
sysmoBTS.

There is some experimental and way incomplete code to use a couple of
OsmocomBB phones and run them in the BTS.  However, the required code
for the Calypso DSP code have not been written yet.  This would still
require a lot of work.

Some additional work is being done in using some parts of the OpenBTS
L1FEC and glue it against omso-bts.  This code is called osmo-trx and
requires the jolly/trx branch of this repository.

== Known Limitations ==

As of August 20, 2015, the following known limitations exist in this
implementation:

=== Common Core ===
 * No Extended BCCH support
 * System Information limited to 1,2,2bis,2ter,2quater,3,4,5,6,9,13
 * No RATSCCH in AMR
 * No OML (TS 12.21) alarms yet (temperature, ...)
 * Only single-TRX BTS at this point
 * Will reject TS 12.21 STARTING TIME in SET BTS ATTR / SET CHAN ATTR
 * No support for frequency hopping
 * No reporting of interference levels as part of TS 08.58 RF RES IND
 * No error reporting in case PAGING COMMAND fails due to queue overflow
 * No use of TS 08.58 BS Power and MS Power parameters
 * No support of TS 08.58 MultiRate Control
 * No support of TS 08.58 Supported Codec Types
 * No support of Bter frame / ENHANCED MEASUREMENT REPORT

=== osmo-bts-sysmo ===
 * No CSD / ECSD support (not planned)
 * GSM-R frequency band supported, but no NCH/ASCI/SoLSA
 * All timeslots on one TRX have to use same training sequence (TSC)
 * No multi-TRX support yet, though hardware+L1 support stacking
 * Makes no use of 12.21 Intave Parameters and Interference
   Level Boundaries
 * Doesn't yet include MAC address in Abis/IP Identity message
 * MphConfig.CNF can be returned to the wrong callback. E.g. with Tx Power
   and ciphering. The dispatch should take a look at the hLayer3.