Cellular Network Infrastructure » Core Network (CN) » OsmoSGSN

OsmoSGSN » History » Revision 20

Revision 19 (neels, 02/22/2018 11:02 PM) → Revision 20/28 (laforge, 03/05/2018 03:20 PM)

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 h1. [[OsmoSGSN:]] 


 Serving GPRS Support Node (SGSN).    As such it implements the GPRS Mobility Management (GMM) and SM (Session Management). 

 The SGSN implements 
 * the Gb interface to the BSS's (like the [[OsmoPCU:]] or an ip.access [[OpenBSC:nanoBTS]]) 
 * the Gp interface with its GTP protocol to one or more Gateway GPRS Support Node (GGSN) like [[OpenGGSN:OsmoGGSN]]. 
 * the IuPS interface with its RANAP protocol to onre or more RNCs or HNB-GWs like [[OsmoHNBGW:]] 
 * the [[cellular-infrastructure:GSUP]] Interface/Protocol towards [[OsmoHLR:]] 

 [[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 
 [[OpenGGSN:OsmoGGSN]] project. 

 

 h2. Position in a typical Osmocom network 

 For a more complete graph, see [[Cellular Infrastructure:Osmocom Network In The Box]] 

 {{graphviz_link() 
 digraph G { 
     rankdir = LR; 
     OsmoBTS -> OsmoBSC [label="Abis/IP"]; 
     OsmoBSC -> OsmoMSC [label="3GPP AoIP"]; 
     OsmoBTS -> OsmoPCU [label="pcu_sock"]; 
     OsmoPCU -> OsmoSGSN [label="Gb/IP"]; 
     OsmoMSC -> OsmoHLR [label="GSUP"]; 
     OsmoSGSN -> OsmoHLR [label="GSUP"]; 
     hNodeB -> OsmoHNBGW [label="Iuh"]; 
     OsmoHNBGW -> OsmoMSC [label="IuCS"]; 
     OsmoHNBGW -> OsmoSGSN [label="IuPS"]; 
     OsmoSGSN -> OsmoGGSN [label="Gp"]; 
     OsmoGGSN -> Internet [label="Gi"]; 
     OsmoSGSN [color=red]; 
 } 
 }} 

 

 h2. Setup / Configuration 

 For more information regarding the setup + configuration, refer to [[cellular-infrastructure:OpenBSC_GPRS]] 

 h2. Binary packages 

 OsmoSGSN packages are created as part of the Osmocom nightly Debian/Ubuntu builds, see [[cellular-infrastructure:NightlyBuilds]] 

 h2. Manuals 

 * User Manual: http://ftp.osmocom.org/docs/latest/osmosgsn-usermanual.pdf 
 * VTY Reference: http://ftp.osmocom.org/docs/latest/osmosgsn-vty-reference.pdf 

 h2. TODO list 

 For details see the Issue tracker above.    Roughtly, the following areas are in need of attention: 

 * secondary PDP contexts 
 * persistent storage of GMM and SM state 
 * recovery from GGSN outages 
 * SMS delivery via GPRS 
 * network-initiated PDP context activation 

 h2. Contact 

 * Contact us via the osmocom-net-gprs@ mailing list, see [[Cellular Infrastructure:Mailing Lists]]. 
 * Contributions are welcome via [[Cellular Infrastructure:Gerrit]]. 
 * Git repository browser at https://git.osmocom.org/osmo-sgsn