laforge, 02/19/2016 10:48 PM
[[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)
[[OsmoBTS]] is building up on work done previosuly for [[OpenBSC]] (RSL, OML, RTP) and "OsmocomBB":http://bb.osmocom.org (LAPDm). The Abis/IP protocol staking is inspired by ip.access A-bis/IP, sometimes called IPA multiplex.
h2. 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:
** Multiple indoor and outdoor BTS products called "sysmoBTS":http://www.sysmocom.de/products/sysmobts which is sold by "sysmocom":http://sysmocom.de/
** 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":https://fairwaves.co 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
h2. GPRS support
osmo-bts has recently been extended with a socket interface towards [[osmo-pcu]]. This adds GPRS (and later EDGE) support to it.
h2. Source code
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/
h2. 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.