OpenBSC » History » Version 6
laforge, 02/19/2016 10:47 PM
voice calls work quite reliably now
| 1 | 1 | laforge | '''OpenBSC''' is the current name for a software program that started with the name bs11-abis. |
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| 2 | |||
| 3 | == What is OpenBSC == |
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| 4 | 2 | laforge | It is a [wiki:BSC] (Base Station Controller) side implementation of the A-bis protocol, as implemented in the GSM Technical Specification 08.5x and 12.21. It implements a minimal subset of the [wiki:BSC], [wiki:MSC] and [wiki:HLR]. It does not implement ant of the interfaces (like the A and B interfaces) between the higher-order GSM network components. |
| 5 | 1 | laforge | |
| 6 | The goal of the project is to |
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| 7 | * provide a basis for experimentation and security research with GSM from the network side |
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| 8 | * document, publicized and point out any security related issues that we find as part of that |
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| 9 | * learn more about GSM networks on a lower level, particularly the practical aspects with real-world equipment |
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| 10 | |||
| 11 | We '''are not interested''' in |
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| 12 | * building a stable/reliable BSC/MSC for deployment in actual networks |
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| 13 | * building something that follows the GSM spec to the last detail |
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| 14 | * disrupting actual commercial GSM network |
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| 15 | |||
| 16 | == Requirements == |
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| 17 | |||
| 18 | 2 | laforge | OpenBSC runs only on Linux systems and requires a [wiki:E1] interface card compatible with [wiki:mISDN] |
| 19 | 1 | laforge | |
| 20 | 5 | laforge | It requires a GSM [wiki:BTS]. The only currently tested configuration is with a Siemens [wiki:BS11 BS-11] microBTS. We are working on supporting [wiki:nanoBTS ip.access nanoBTS], but this is in a very early stage. |
| 21 | 1 | laforge | |
| 22 | == Source code == |
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| 23 | |||
| 24 | You can check out the source code via |
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| 25 | {{{ |
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| 26 | svn checkout http://bs11-abis.gnumonks.org/svn/trunk/openbsc |
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| 27 | }}} |
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| 28 | or browse it at http://bs11-abis.gnumonks.org/trac/browser |
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| 29 | |||
| 30 | 3 | laforge | == Mailing list == |
| 31 | |||
| 32 | There's a developer mailing list called openbsc@lists.gnumonks.org |
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| 33 | Subscription is available at [http://lists.gnumonks.org/mailman/listinfo/openbsc/] |
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| 34 | |||
| 35 | 2 | laforge | == Project status == |
| 36 | |||
| 37 | === Things that work === |
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| 38 | * [wiki:OML] Initialization of the BTS |
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| 39 | * [wiki:RSL] bringup, channel allocation, Channel required / Immediate Assign |
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| 40 | * Very simplistic [wiki:HLR] implemented as sqlite database |
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| 41 | * Non-secure Authentication using [wiki:IMEI]/[wiki:IMSI] and regular SIM cards. |
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| 42 | * [wiki:IMEI]/[wiki:IMSI] skimming of all phones that try to register with OpenBSC |
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| 43 | * [wiki:SMS] reception and [wiki:SMS] sending (simplistic, not possible to route them yet) |
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| 44 | * Transmission of MM INFO packets with operator name and local time / timezone |
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| 45 | 5 | laforge | * Extremely simplistic call control for MO (Mobile Originated) and MT (Mobile Terminated) calls |
| 46 | 4 | laforge | * TCH/F support |
| 47 | 5 | laforge | * paging of mobiles that are registered to the BTS |
| 48 | 1 | laforge | * signalling of mobile-originated and mobile-terminated calls |
| 49 | 6 | laforge | * processing/switching of calls from one phone to another |
| 50 | * demultiplex of the four 16k sub-channels with voice data contained in one [wiki:E1] timeslot |
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| 51 | 1 | laforge | |
| 52 | 5 | laforge | === Things that are implemented but don't work yet or aren't tested yet === |
| 53 | * support for multiple [wiki:TRX] in one [wiki:BTS] |
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| 54 | 2 | laforge | |
| 55 | === Things that are missing === |
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| 56 | * Cell Broadcast |
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| 57 | * transcoding of voice data |
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| 58 | * TCH/H voice calls |
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| 59 | * [wiki:CSD] calls |
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| 60 | 1 | laforge | * handover between multiple [wiki:BTS] |
| 61 | 2 | laforge | * emergency call handling |
| 62 | * Discontinuous TX and RX ([wiki:DTX] / [wiki:DRX]) support |
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| 63 | 4 | laforge | * Support the use of A3/A8 and A5/1 (we need SIM cards with known Ki, e.g. simulated SIM cards) |
| 64 | 2 | laforge | |
| 65 | 1 | laforge | == Authors == |
| 66 | |||
| 67 | 2 | laforge | OpenBSC was mainly developed by [http://laforge.gnumonks.org/ Harald Welte]. Contributions by Holger Freyther, Stefan Schmidt, Daniel Willmann, Jan Luebbe and Thomas Seiler. |
| 68 | 1 | laforge | |
| 69 | 2 | laforge | Thanks to Dieter Spaar for his [wiki:BS11-Init], without which we would not have been able to make progress as quickly as we did. |
