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Revision 19 (laforge, 10/21/2017 02:49 PM) → Revision 20/34 (laforge, 03/05/2018 03:34 PM)
h1. [[OsmoBTS]] [[OsmoBTS]] is a software implementation of a GSM BTS(Base Transceiver Station). 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 [[OpenBSC:]] (e.g. RSL, OML, RTP) and [[OsmocomBB:]] (e.g. LAPDm). The Abis/IP protocol staking is inspired by ip.access A-bis/IP, sometimes called IPA multiplex. h2. OsmoBTS in the Osmocom architecture h3. OsmoBTS in a GSM + GPRS/EDGE network using [[OsmoNITB:]] {{graphviz_link() digraph G { rankdir = LR; OsmoTRX -> OsmoBTS [label="bursts over UDP"]; sysmoPHY -> OsmoBTS [label="/dev/msgq/"]; octPHY -> OsmoBTS [label="Raw Ethernet"]; OsmoBTS -> OsmoNITB [label="Abis/IP"]; OsmoBTS -> OsmoPCU [label="pcu_sock"]; OsmoPCU -> OsmoSGSN [label="Gb/IP"]; OsmoBTS [color=red]; } }} h3. OsmoBTS in a GSM + GPRS/EDGE network using [[OsmoBSC:]] and [[OsmoMSC:]] {{graphviz_link() digraph G { rankdir = LR; OsmoTRX -> OsmoBTS [label="bursts over UDP"]; sysmoPHY -> OsmoBTS [label="/dev/msgq/"]; octPHY -> OsmoBTS [label="Raw Ethernet"]; OsmoBTS -> OsmoBSC [label="Abis/IP"]; OsmoBSC -> OsmoMSC [label="3GPP AoIP"]; OsmoMSC -> OsmoHLR [label="GSUP"]; OsmoBTS -> OsmoPCU [label="pcu_sock"]; OsmoPCU -> OsmoSGSN [label="Gb/IP"]; OsmoSGSN -> OsmoGGSN [label="Gp"]; OsmoBTS [color=red]; } }} 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: * osmo-bts-sysmo ** Multiple indoor and outdoor BTS products called "sysmoBTS":http://www.sysmocom.de/products/sysmobts by "sysmocom":http://sysmocom.de/ * osmo-bts-trx ** Wideband SDR transceiver hardware supported by [[OpenBTS]] transceiver or [OsmoTRX] PHY layer software, including the [[umtrx:UmTRX]], the USRP family, etc. ** Multiple indoor and outdoor "fairwaves":https://fairwaves.co BTSs, like [[umtrx:UmDESK]] and [[umtrx:UmSITE]] * osmo-bts-litecell15 * osmo-bts-octphy * 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. {{graphviz_link() graph G { OsmoBTS [color=red]; sysmoBTS [label="sysmocom sysmoBTS\n(many models)", shape=box]; LC15 [label="Nuran\nLitecell 1.5", shape=box]; OCT [label="Octasic\nOCTBTS", shape=box]; TRX [label="OsmoTRX"]; OtherSDR [label="Other SDR HW", shape=box, style=dashed]; OtherPHY [label="Other GSM PHY", shape=box, style=dashed]; UmTRX [label="Fairwaves\nUmTRX", shape=box]; USRP [label="Ettus USRP\nFamily", shape=box]; OsmoBTS -- sysmoBTS [label="osmo-bts-sysmo"]; OsmoBTS -- LC15 [label="osmo-bts-lc15"]; OsmoBTS -- OCT [label="osmo-bts-octphy"]; OsmoBTS -- TRX [label="osmo-bts-trx"]; OsmoBTS -- OtherPHY [style=dashed]; TRX -- USRP; TRX -- UmTRX; TRX -- OtherSDR [style=dashed]; { rank=same; sysmoBTS LC15 OCT UmTRX } } }} {{include(cellular-infrastructure:MacroBinaryPackages)}} h2. Manuals * User Manual: http://ftp.osmocom.org/docs/latest/osmobts-usermanual.pdf * VTY Reference: http://ftp.osmocom.org/docs/latest/osmobsc-vty-reference.pdf * Abis Protocol Manual: http://ftp.osmocom.org/docs/latest/osmobts-abis.pdf h2. Status The source code includes a http://cgit.osmocom.org/cgit/osmo-bts/tree/README file with current status information h2. GPRS support In the GSM architecture, the BTS is an element in the circuit-switched domain only. For packet-switched support, OsmoBTS provides a socket interface towards [[OsmoPCU:]]. This adds GPRS and 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.