Cisco ASR 5000 Series Product Overview ▄
Product Description
The Serving Gateway routes and forwards data packets from the UE and acts as the mobility anchor during inter-
eNodeB handovers. Signals controlling the data traffic are received on the S-GW from the MME which determines the
S-GW that will best serve the UE for the session. Every UE accessing the EPC is associated with a single S-GW.
The S-GW is also involved in mobility by forwarding down link data during a handover from the E-UTRAN to the
eHRPD network. An interface from the eAN/ePCF to an MME provides signaling that creates a GRE tunnel between
the S-GW and the eHRPD Serving Gateway.
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