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= OsmoBTS =

OsmoBTS is a software part of a BTS, which implements Layer 1, Layer 2 and Layer 3: * LAPDm (GSM 04.06) * RTP * A-bis/IP (similar to ip.access nanoBTS) * OML (GSM 12.21) * RSL (GSM 08.58)

OsmoBTS is building up on work done previosuly for [wiki:OpenBSC] (RSL, OML, RTP) and [ OsmocomBB] (LAPDm). A-bis/IP implementation is heavily inspired by ip.access nanoBTS A-bis/IP implementation.

OsmoBTS is written in a re-targettable way, i.e. it should be relatively easy to target a new BTS hardware (i.e. BTS-side Layer 0 or Layer 1) with it.

Hardware support

So far OsmoBTS supports a number of hardware options: * Quad-band femto-BTS product called [ sysmoBTS] which is sold by [ sysmocom] * Wideband SDR transceiver hardware [ UmTRX] sold by [ fairwaves] and a number of other SDR transceivers, using OpenBTS transceiver software. * 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.

Check out [wiki:network_from_scratch] page for more information how to run OsmoBTS with UmTRX (using the OpenBTS transceiver software) or OsmocomBB phones.


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:


OsmoBTS was developed mainly by Andreas Eversberg and Harald Welte.