Wiki » History » Version 15
laforge, 02/21/2016 02:57 PM
| 1 | 10 | laforge | h1. [[OsmoBTS]] |
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| 2 | 4 | ipse | |
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| 4 | 15 | laforge | [[OsmoBTS]] is a software implementation of a GSM BTS(Base Transceiver Station). |
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| 6 | It implements the follwing protocols/interfaces: |
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| 7 | 10 | laforge | * LAPDm (GSM 04.06) |
| 8 | * RTP |
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| 9 | * A-bis/IP in IPA multiplex |
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| 10 | * OML (GSM TS 12.21) |
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| 11 | * RSL (GSM TS 08.58) |
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| 12 | 1 | laforge | |
| 13 | 14 | laforge | [[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. |
| 14 | 1 | laforge | |
| 15 | 11 | laforge | h2. OsmoBTS in the Osmocom architecture |
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| 17 | {{graphviz_link() |
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| 18 | digraph G { |
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| 19 | rankdir = LR; |
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| 20 | OsmoTRX -> OsmoBTS [label="bursts over UDP"]; |
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| 21 | sysmoPHY -> OsmoBTS [label="/dev/msgq/"]; |
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| 22 | octPHY -> OsmoBTS [label="Raw Ethernet"]; |
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| 23 | OsmoBTS -> OsmoNITB [label="Abis/IP"]; |
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| 24 | OsmoBTS -> OsmoPCU [label="pcu_sock"]; |
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| 25 | OsmoPCU -> OsmoSGSN [label="Gb/IP"]; |
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| 26 | OsmoBTS [color=red]; |
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| 27 | } |
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| 28 | }} |
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| 29 | 1 | laforge | |
| 30 | 10 | laforge | h2. Backends / Hardware support |
| 31 | 9 | laforge | |
| 32 | 10 | laforge | |
| 33 | [[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. |
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| 34 | |||
| 35 | So far [[OsmoBTS]] has been integrated with several different L1/PHY and hardware systems. The backends are: |
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| 36 | * osmo-bts-sysmo |
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| 37 | 13 | laforge | ** Multiple indoor and outdoor BTS products called "sysmoBTS":http://www.sysmocom.de/products/sysmobts by "sysmocom":http://sysmocom.de/ |
| 38 | 1 | laforge | * osmo-bts-trx |
| 39 | 13 | laforge | ** Wideband SDR transceiver hardware supported by [[OpenBTS]] transceiver or [OsmoTRX] PHY layer software, including the [[umtrx:UmTRX]], the USRP family, etc. |
| 40 | ** Multiple indoor and outdoor "fairwaves":https://fairwaves.co BTSs, like [[umtrx:UmDESK]] and [[umtrx:UmSITE]] |
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| 41 | * osmo-bts-litecell15 |
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| 42 | * osmo-bts-octphy |
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| 43 | 10 | laforge | * osmo-bts-bb |
| 44 | ** 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. |
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| 45 | |||
| 46 | h2. Status |
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| 47 | |||
| 48 | |||
| 49 | 9 | laforge | The source code includes a http://cgit.osmocom.org/cgit/osmo-bts/tree/README file with current status information |
| 50 | |||
| 51 | 1 | laforge | h2. GPRS support |
| 52 | 10 | laforge | |
| 53 | 12 | laforge | In the GSM architecture, the BTS is an element in the circuit-switched domain only. |
| 54 | 1 | laforge | |
| 55 | 12 | laforge | For packet-switched support, OsmoBTS provides a socket interface towards [[OsmoPCU:]]. This adds GPRS and EDGE support to it. |
| 56 | 10 | laforge | |
| 57 | h2. Source code |
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| 58 | |||
| 59 | |||
| 60 | 1 | laforge | The source code is available from git.osmocom.org (module osmo-bts). |
| 61 | 6 | ipse | |
| 62 | Public read-only access is available via |
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| 63 | git clone git://git.osmocom.org/osmo-bts.git |
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| 64 | You can browse it via cgit: http://cgit.osmocom.org/cgit/osmo-bts/ |
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| 67 | 10 | laforge | h2. Authors / Credits |
| 68 | 1 | laforge | |
| 69 | 10 | laforge | |
| 70 | [[OsmoBTS]] was originally developed in 2011 by Andreas Eversberg and Harald Welte. |
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| 71 | 9 | laforge | |
| 72 | 12 | laforge | 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. |
