2017-03-17 16:34:41 +00:00
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osmo-bts - Osmocom BTS Implementation
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====================================
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2011-03-25 12:33:15 +00:00
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2017-03-17 16:34:41 +00:00
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This repository contains a C-language implementation of a GSM Base
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Transceiver Station (BTS). It is part of the
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[Osmocom](https://osmocom.org/) Open Source Mobile Communications
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project.
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2011-03-25 12:33:15 +00:00
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2016-11-11 21:16:12 +00:00
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This code implements Layer 2 and higher of a more or less conventional GSM BTS
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(Base Transceiver Station) - however, using an Abis/IP interface, rather than
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the old-fashioned E1/T1.
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2012-05-05 12:44:29 +00:00
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2016-11-11 21:16:12 +00:00
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Specifically, this includes
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* BTS-side implementation of TS 08.58 (RSL) and TS 12.21 (OML)
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* BTS-side implementation of LAPDm (using libosmocore/libosmogsm)
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* A somewhat separated interface between those higher layer parts and the
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Layer1 interface.
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2012-05-05 12:44:29 +00:00
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2016-11-11 21:16:12 +00:00
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Several kinds of BTS hardware are supported:
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* sysmocom sysmoBTS
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* Octasic octphy
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* Nutaq litecell 1.5
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2021-01-06 12:23:31 +00:00
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* OpenCellular 2G (OC-2G)
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2019-05-21 18:33:56 +00:00
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* software-defined radio based osmo-bts-trx (e.g. USRP B210, UmTRX, LimeSDR)
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2017-03-17 16:34:41 +00:00
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Homepage
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--------
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The official homepage of the project is
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2022-06-18 09:39:02 +00:00
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<https://osmocom.org/projects/osmobts/wiki>
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2017-03-17 16:34:41 +00:00
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GIT Repository
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--------------
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You can clone from the official osmo-bts.git repository using
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2022-06-18 09:39:02 +00:00
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git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-bts
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2017-03-17 16:34:41 +00:00
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2022-06-18 09:39:02 +00:00
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There is a web interface at <https://gitea.osmocom.org/cellular-infrastructure/osmo-bts>
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2017-03-17 16:34:41 +00:00
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Documentation
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-------------
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2012-06-03 09:01:31 +00:00
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2021-01-06 12:23:31 +00:00
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User Manuals and VTY reference manuals are [optionally] built in PDF form
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as part of the build process.
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Pre-rendered PDF version of the current "master" can be found at
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[User Manual](https://ftp.osmocom.org/docs/latest/osmobts-usermanual.pdf)
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as well as the VTY reference manuals
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* [VTY Reference Manual for osmo-bts-sysmo](https://ftp.osmocom.org/docs/latest/osmobts-sysmo-vty-reference.pdf)
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* [VTY Reference Manual for osmo-bts-trx](https://ftp.osmocom.org/docs/latest/osmobts-trx-vty-reference.pdf)
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* [VTY Reference Manual for osmo-bts-lc15](https://ftp.osmocom.org/docs/latest/osmobts-lc15-vty-reference.pdf)
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* [VTY Reference Manual for osmo-bts-oc2g](https://ftp.osmocom.org/docs/latest/osmobts-oc2g-vty-reference.pdf)
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* [VTY Reference Manual for osmo-bts-octphy](https://ftp.osmocom.org/docs/latest/osmobts-octphy-vty-reference.pdf)
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There also is an
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[Abis reference Manual](https://ftp.osmocom.org/docs/latest/osmobts-abis.pdf)
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2017-03-17 16:34:41 +00:00
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describing the OsmoBTS specific A-bis dialect.
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Mailing List
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------------
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Discussions related to osmo-bts are happening on the
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openbsc@lists.osmocom.org mailing list, please see
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https://lists.osmocom.org/mailman/listinfo/openbsc for subscription
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options and the list archive.
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Please observe the [Osmocom Mailing List
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Rules](https://osmocom.org/projects/cellular-infrastructure/wiki/Mailing_List_Rules)
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when posting.
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Contributing
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------------
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Our coding standards are described at
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https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards
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We us a gerrit based patch submission/review process for managing
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contributions. Please see
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https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for
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more details
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The current patch queue for osmo-bts can be seen at
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https://gerrit.osmocom.org/#/q/project:osmo-bts+status:open
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Known Limitations
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=================
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2012-06-03 09:01:31 +00:00
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2021-01-06 12:23:31 +00:00
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As of January 2021, the following known limitations exist in this
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2012-06-03 09:01:31 +00:00
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implementation:
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2017-03-17 16:34:41 +00:00
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Common Core
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-----------
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2012-06-03 09:01:31 +00:00
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* No Extended BCCH support
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* System Information limited to 1,2,2bis,2ter,2quater,3,4,5,6,9,13
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* No RATSCCH in AMR
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* Will reject TS 12.21 STARTING TIME in SET BTS ATTR / SET CHAN ATTR
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* No support of TS 08.58 MultiRate Control
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* No support of TS 08.58 Supported Codec Types
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* No support of Bter frame / ENHANCED MEASUREMENT REPORT
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2017-03-17 16:34:41 +00:00
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osmo-bts-sysmo
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--------------
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2012-06-03 09:01:31 +00:00
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* No CSD / ECSD support (not planned)
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* GSM-R frequency band supported, but no NCH/ASCI/SoLSA
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* All timeslots on one TRX have to use same training sequence (TSC)
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* No multi-TRX support yet, though hardware+L1 support stacking
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2012-06-15 06:54:33 +00:00
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* Makes no use of 12.21 Intave Parameters and Interference
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2012-06-03 09:01:31 +00:00
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Level Boundaries
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2013-01-30 08:29:52 +00:00
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* MphConfig.CNF can be returned to the wrong callback. E.g. with Tx Power
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and ciphering. The dispatch should take a look at the hLayer3.
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2017-03-17 16:36:54 +00:00
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osmo-bts-octphy
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---------------
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* No support of EFR, HR voice codec (lack of PHY support?)
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* No re-transmission of PHY primitives in case of time-out
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* Link Quality / Measurement processing incomplete
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* impossible to modify encryption parameters using RSL MODE MODIFY
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* no clear indication of nominal transmit power, various power related
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computations are likely off
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* no OML attribute validation during bts_model_check_oml()
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