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laforge, 02/19/2016 10:47 PM

= OsmoBTS =

OsmoBTS is a software implementation of Layer2/3 of a BTS. It implements the follwing protocols/interfaces: * LAPDm (GSM 04.06) * RTP * A-bis/IP in IPA multiplex * OML (GSM TS 12.21) * RSL (GSM TS 08.58)

OsmoBTS is building up on work done previosuly for [wiki:OpenBSC] (RSL, OML, RTP) and [ OsmocomBB] (LAPDm). The Abis/IP protocol staking is inspired by ip.access A-bis/IP, sometimes called IPA multiplex.

Backends / Hardware support

OsmoBTS is modular and has support for multiple back-ends. A back-end talks to a specific L1/PHY implementation of the respective BTS hardware. Based on this architecture, it should be relatively easy to add a new back-end to support so-far unsupported GSM PHY/L1 and associated hardware.

So far OsmoBTS has been integrated with several different L1/PHY and hardware systems. The backends are: * osmo-bts-sysmo * Multiple indoor and outdoor BTS products called [ sysmoBTS] which is sold by [ sysmocom] * osmo-bts-trx * Wideband SDR transceiver hardware supported by OpenBTS transceiver or [OsmoTRX] PHY layer software, including the UmTRX, the USRP family, etc. * Multiple indoor and outdoor [ fairwaves] BTSs, like UmDESK and UmSITE * osmo-bts-bb * A pretty crazy experimental BTS hardware based on two OsmocomBB phones had originally been supported, but needs to be re-integrated with core code changes.


The source code includes a file with current status information

GPRS support

osmo-bts has recently been extended with a socket interface towards [wiki:osmo-pcu]. This adds GPRS (and later EDGE) support to it.

Source code

The source code is available from (module osmo-bts).

Public read-only access is available via
git clone git://
You can browse it via cgit:

Authors / Credits

OsmoBTS was originally developed in 2011 by Andreas Eversberg and Harald Welte.

Today it is mostly maintained by Harald Welte and Holger Freyther at sysmocom. Exception is the osmo-bts-trx back-end which is maintained by Fairwaves.

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Updated by laforge about 8 years ago · 9 revisions

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