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Osmocom Base Transceiver Station (BTS) https://osmocom.org/projects/osmobts
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Harald Welte a240bdd0a4 OML: Ensure minimum required attributes are set before accepting OPSTART 
There are some vital configuration bits such as ARFCN, BSIC, channel
config, .. for which there are no reasonable defaults.  As a result,
the BSC must set those attributes before issuing OPSTART.

Prior to this patch we would blindly accept OPSTART and then transmit
on ARFCN 0, which is definitely not the intended behavior.

Closes: OS#3789
Change-Id: I3a818f8eceb6abef1b20d2b3892a749dbc9e4b05
 		2019-02-23 15:59:18 +01:00
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doc doc/examples: Install OC2G config files with autotools 2019-01-30 10:35:13 +01:00
include OML: Use 'const struct abis_oml_mo *' whenever users only read 2019-02-12 20:08:18 +01:00
src OML: Ensure minimum required attributes are set before accepting OPSTART 2019-02-23 15:59:18 +01:00
tests bts_model: Allow TS connect to be processed asynchronously 2018-11-26 14:08:14 +01:00
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Makefile.am Fix DISTCHECK_CONFIGURE_FLAGS override 2018-12-04 16:13:16 +01:00
README.md CBCH: Implement CBCH support for osmo-bts-{trx,virtual} 2018-09-09 15:40:58 +00:00
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README.md

osmo-bts - Osmocom BTS Implementation

This repository contains a C-language implementation of a GSM Base Transceiver Station (BTS). It is part of the Osmocom Open Source Mobile Communications project.

This code implements 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.

Several kinds of BTS hardware are supported:

  • sysmocom sysmoBTS
  • Octasic octphy
  • Nutaq litecell 1.5
  • software-defined radio based osmo-bts-trx (e.g. USRP B210, UmTRX)

Homepage

The official homepage of the project is https://osmocom.org/projects/osmobts/wiki

GIT Repository

You can clone from the official osmo-bts.git repository using

git clone git://git.osmocom.org/osmo-bts.git

There is a cgit interface at http://git.osmocom.org/osmo-bts/

Documentation

We provide a User Manual as well as a VTY Reference Manual and a Abis refrence MAnual describing the OsmoBTS specific A-bis dialect.

Mailing List

Discussions related to osmo-bts are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.

Contributing

Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

We us a gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details

The current patch queue for osmo-bts can be seen at https://gerrit.osmocom.org/#/q/project:osmo-bts+status:open

Known Limitations

As of March 17, 2017, 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
  • 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
  • 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.

osmo-bts-octphy

  • No support of EFR, HR voice codec (lack of PHY support?)
  • No re-transmission of PHY primitives in case of time-out
  • Link Quality / Measurement processing incomplete
  • impossible to modify encryption parameters using RSL MODE MODIFY
  • no clear indication of nominal transmit power, various power related computations are likely off
  • no OML attribute validation during bts_model_check_oml()

osmo-bts-trx