OsmoSGSN » History » Version 5
manatails, 02/19/2016 10:48 PM
Added some information about IMSI filtering in osmo-sgsn
| 1 | 1 | laforge | [[PageOutline]] |
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| 2 | = OsmoSGSN = |
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| 3 | |||
| 4 | OsmoSGSN (also spelled {{{osmo-sgsn}}} when referring to the program name) is a Free Software implementation of the GPRS |
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| 5 | Serving GPRS Support Node (SGSN). As such it implements the GPRS Mobility Management (GMM) and SM (Session Management). |
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| 6 | |||
| 7 | The SGSN connects via the Gb-Interface to the BSS (e.g. the ip.access nanoBTS), and it connects via the GTP protocol |
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| 8 | to a Gateway GPRS Support Node (GGSN) like [wiki:OpenGGSN]. |
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| 9 | |||
| 10 | 3 | laforge | It is currently still a bit experimental. The Gb protocol stack and the LLC implementation are quite robust, and signalling |
| 11 | for GMM and SM seems to run pretty fine. However, the user plane including SNDCP fragmentation is in beta-testing stage. Also, |
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| 12 | 5 | manatails | no authentication is yet done, i.e. your GPRS network will simply allow every IMSI to attach to it as far as it has the same MCC/MNC as your network. |
| 13 | 1 | laforge | |
| 14 | OsmoSGSN is part of the openbsc git repository. In order to build it, you will need a libgtp installation from the |
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| 15 | 3 | laforge | OpenGGSN project. |
| 16 | 1 | laforge | |
| 17 | 3 | laforge | == Setup / Configuration == |
| 18 | For more information regarding the setup + configuration, refer to [wiki:OpenBSC_GPRS] |
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| 19 | |||
| 20 | 4 | laforge | == Status == |
| 21 | |||
| 22 | There has been a [http://lists.gnumonks.org/pipermail/openbsc/2011-January/002416.html mailing list post] in January 2011 about the current OsmoSGSN state. |
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| 24 | 2 | laforge | == TODO list == |
| 25 | * use the HLR to identify (and possibly authenticate) subscribers |
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| 26 | * secondary PDP contexts |
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| 27 | * support for multiple GGSNs |
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| 28 | * persistent storage of GMM and SM state |
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| 29 | * recovery from GGSN outages |
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| 30 | * SNDCP header and data compression |
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| 31 | * use proper XID exchange and actually use the results to configure the LLC SAPIs |
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| 32 | * GEA3 encryption |
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| 33 | * SMS delivery via GPRS |
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| 34 | * network-initiated PDP context activation |
