OsmoSGSN (also spelled osmo-sgsn when referring to the program name) is a Free Software implementation of the GPRS Serving GPRS Support Node (SGSN). As such it implements the GPRS Mobility Management (GMM) and SM (Session Management).

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 to a Gateway GPRS Support Node (GGSN) like OpenGGSN.

OsmoSGSN is part of the openbsc git repository. In order to build it, you will need a libgtp installation from the OpenGGSN project.

Setup / Configuration

For more information regarding the setup + configuration, refer to OpenBSC_GPRS

TODO list

  • use the OsmoNITB HLR to identify (and possibly authenticate) subscribers
  • secondary PDP contexts
  • persistent storage of GMM and SM state
  • recovery from GGSN outages
  • SNDCP header and data compression
  • use proper XID exchange and actually use the results to configure the LLC SAPIs
  • GEA3 encryption
  • SMS delivery via GPRS
  • network-initiated PDP context activation
Last modified 12 months ago Last modified on Sep 5, 2015, 10:03:45 PM