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OsmoSGSN » History » Version 18

laforge, 10/21/2017 06:22 PM

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{{>toc}}
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h1. [[OsmoSGSN:]]
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Serving GPRS Support Node (SGSN).  As such it implements the GPRS Mobility Management (GMM) and SM (Session Management).
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The SGSN implements
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* the Gb interface to the BSS's (like the [[OsmoPCU:]] or an ip.access [[OpenBSC:nanoBTS]])
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* the Gp interface with its GTP protocol to one or more Gateway GPRS Support Node (GGSN) like [[OpenGGSN:OsmoGGSN]].
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* the IuPS interface with its RANAP protocol to onre or more RNCs or HNB-GWs like [[OsmoHNBGW:]]
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[[OsmoSGSN:]] is available from the http://git.osmocom.org/osmo-sgsn/ repository.  In order to build it, you will need a libgtp installation from the
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[[OpenGGSN:OsmoGGSN]] project.  
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h2. Position in a typical Osmocom network
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{{graphviz_link()
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digraph G {
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    rankdir = LR;
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    OsmoBTS -> OsmoBSC [label="Abis/IP"];
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    OsmoBSC -> OsmoMSC [label="3GPP AoIP"];
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    OsmoBTS -> OsmoPCU [label="pcu_sock"];
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    OsmoPCU -> OsmoSGSN [label="Gb/IP"];
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    OsmoMSC -> OsmoHLR [label="GSUP"];
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    OsmoSGSN -> OsmoHLR [label="GSUP"];
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    hNodeB -> OsmoHNBGW [label="Iuh"];
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    OsmoHNBGW -> OsmoMSC [label="IuCS"];
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    OsmoHNBGW -> OsmoSGSN [label="IuPS"];
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    OsmoSGSN -> OsmoGGSN [label="Gp"];
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    OsmoGGSN -> Internet [label="Gi"];
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    OsmoSGSN [color=red];
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}
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}}
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h2. Setup / Configuration
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For more information regarding the setup + configuration, refer to [[cellular-infrastructure:OpenBSC_GPRS]]
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h2. Manuals
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* User Manual: http://ftp.osmocom.org/docs/latest/osmosgsn-usermanual.pdf
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* VTY Reference: http://ftp.osmocom.org/docs/latest/osmosgsn-vty-reference.pdf
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h2. TODO list
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For details see the Issue tracker above.  Roughtly, the following areas are in need of attention:
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* secondary PDP contexts
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* persistent storage of GMM and SM state
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* recovery from GGSN outages
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* SMS delivery via GPRS
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* network-initiated PDP context activation
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h2. Contact
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* Contact us via the osmocom-net-gprs@ mailing list, see [[Cellular Infrastructure:Mailing Lists]].
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* Contributions are welcome via [[Cellular Infrastructure:Gerrit]].
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* Git repository browser at https://git.osmocom.org/osmo-sgsn