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OsmoSGSN » History » Version 9

laforge, 02/21/2016 03:21 PM

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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 connects via the Gb-Interface to the BSS (like the [[osmo-pcu]] or an ip.access nanoBTS), and it connects via the GTP protocol
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to a Gateway GPRS Support Node (GGSN) like [[OpenGGSN]].
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[[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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[[OpenGGSN]] project.  
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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. TODO list
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* use the [[OsmoNITB]] HLR to identify (and possibly authenticate) subscribers
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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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* SNDCP header and data compression
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* use proper XID exchange and actually use the results to configure the LLC SAPIs
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* GEA3 encryption
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* SMS delivery via GPRS
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* network-initiated PDP context activation