Friday, November 6, 2009

S-GW Functions

The Serving Gateway (S-GW) hosts the following functions (see 3GPP TS 23.401 [17])
  • The local Mobility Anchor point for inter-eNB handover;
  • Mobility anchoring for inter-3GPP mobility;
  • E-UTRAN idle mode downlink packet buffering and initiation of network triggered service request procedure;
  • Lawful Interception;
  • Packet routeing and forwarding;
  • Transport level packet marking in the uplink and the downlink;
  • Accounting on user and QCI granularity for inter-operator charging;
  • UL and DL charging per UE, PDN, and QCI.

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