Wiki » History » Version 11
laforge, 02/21/2016 02:51 PM
1 | 1 | laforge | |
---|---|---|---|
2 | 10 | laforge | h1. [[OsmoBTS]] |
3 | 4 | ipse | |
4 | |||
5 | 10 | laforge | [[OsmoBTS]] is a software implementation of Layer2/3 of a BTS. It implements the follwing protocols/interfaces: |
6 | * LAPDm (GSM 04.06) |
||
7 | * RTP |
||
8 | * A-bis/IP in IPA multiplex |
||
9 | * OML (GSM TS 12.21) |
||
10 | * RSL (GSM TS 08.58) |
||
11 | 1 | laforge | |
12 | 10 | laforge | [[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. |
13 | 1 | laforge | |
14 | 11 | laforge | h2. OsmoBTS in the Osmocom architecture |
15 | |||
16 | {{graphviz_link() |
||
17 | digraph G { |
||
18 | rankdir = LR; |
||
19 | OsmoTRX -> OsmoBTS [label="bursts over UDP"]; |
||
20 | sysmoPHY -> OsmoBTS [label="/dev/msgq/"]; |
||
21 | octPHY -> OsmoBTS [label="Raw Ethernet"]; |
||
22 | OsmoBTS -> OsmoNITB [label="Abis/IP"]; |
||
23 | OsmoBTS -> OsmoPCU [label="pcu_sock"]; |
||
24 | OsmoPCU -> OsmoSGSN [label="Gb/IP"]; |
||
25 | OsmoBTS [color=red]; |
||
26 | } |
||
27 | }} |
||
28 | 1 | laforge | |
29 | 10 | laforge | h2. Backends / Hardware support |
30 | 9 | laforge | |
31 | 10 | laforge | |
32 | [[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. |
||
33 | |||
34 | So far [[OsmoBTS]] has been integrated with several different L1/PHY and hardware systems. The backends are: |
||
35 | * osmo-bts-sysmo |
||
36 | ** Multiple indoor and outdoor BTS products called "sysmoBTS":http://www.sysmocom.de/products/sysmobts which is sold by "sysmocom":http://sysmocom.de/ |
||
37 | * osmo-bts-trx |
||
38 | ** Wideband SDR transceiver hardware supported by [[OpenBTS]] transceiver or [OsmoTRX] PHY layer software, including the [[UmTRX]], the USRP family, etc. |
||
39 | ** Multiple indoor and outdoor "fairwaves":https://fairwaves.co BTSs, like [[UmDESK]] and [[UmSITE]] |
||
40 | * osmo-bts-bb |
||
41 | ** 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. |
||
42 | |||
43 | |||
44 | h2. Status |
||
45 | |||
46 | |||
47 | 9 | laforge | The source code includes a http://cgit.osmocom.org/cgit/osmo-bts/tree/README file with current status information |
48 | |||
49 | |||
50 | 10 | laforge | h2. GPRS support |
51 | 1 | laforge | |
52 | |||
53 | 10 | laforge | osmo-bts has recently been extended with a socket interface towards [[osmo-pcu]]. This adds GPRS (and later EDGE) support to it. |
54 | |||
55 | |||
56 | h2. Source code |
||
57 | |||
58 | |||
59 | 1 | laforge | The source code is available from git.osmocom.org (module osmo-bts). |
60 | 6 | ipse | |
61 | Public read-only access is available via |
||
62 | git clone git://git.osmocom.org/osmo-bts.git |
||
63 | You can browse it via cgit: http://cgit.osmocom.org/cgit/osmo-bts/ |
||
64 | |||
65 | |||
66 | 10 | laforge | h2. Authors / Credits |
67 | |||
68 | |||
69 | [[OsmoBTS]] was originally developed in 2011 by Andreas Eversberg and Harald Welte. |
||
70 | 9 | laforge | |
71 | 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. |