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GPRS core network
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====Common SGSN functions==== * Detunnel GTP packets from the GGSN (downlink) * Tunnel IP packets toward the GGSN (uplink) * Carry out mobility management when a standby mode mobile moves from one routing area to another routing area * Billing a user according to data used. * Mobile Equipment Identity Check Procedure (Gf/S13' interfaces). * The SMS GMSCs and SMS IWMSCs support SMS transmission via the SGSN.<ref>3GPP TS 23.060 V14.3.0 (2017-03), p.24</ref> * The Offline Charging System (OFCS) collects charging records from SGSNs.<ref name="3GPP TS 23.060 V14.3.0 (2017-03), p.23" /> * The SGSN contains mechanisms for avoiding and handling overload situations. <ref>3GPP TS 23.060 V14.3.0 (2017-03), p.35</ref> * The SGSN communicate with other SGSN(s) and/or MME(s) ([[Mobility Management Entity]]) (Gn/S16/S3 interfaces)
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