OsmoBTS is a software implementation of Layer2/3 of a BTS. It implements the follwing protocols/interfaces:
- LAPDm (GSM 04.06)
- A-bis/IP in IPA multiplex
- OML (GSM TS 12.21)
- RSL (GSM TS 08.58)
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:
- 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
- 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 http://cgit.osmocom.org/cgit/osmo-bts/tree/README file with current status information
osmo-bts has recently been extended with a socket interface towards osmo-pcu. This adds GPRS (and later EDGE) support to it.
The source code is available from git.osmocom.org (module osmo-bts).
Public read-only access is available via
git clone git://git.osmocom.org/osmo-bts.git
You can browse it via cgit: http://cgit.osmocom.org/cgit/osmo-bts/
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.