Cisco ASR 5000 series Product Overview page 620

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▀ Product Description

Figure 154. Basic E-UTRAN/EPC and eHRPD Network Topology

The functions of the S-GW for both GTP-based and PMIP-based network sessions include:

packet routing and forwarding.

providing the local mobility anchor point for inter-eNodeB handover and assisting the eNodeB reordering

function by sending one or more ―end marker‖ packets to the source eNodeB immediately after switching the

mobility anchoring for inter-3GPP mobility (terminating the S4 interface from an SGSN and relaying the traffic

between 2G/3G system and a PDN gateway.

packet buffering for ECM-IDLE mode downlink and initiation of network triggered service request procedure.

▄ Cisco ASR 5000 Series Product Overview

Serving Gateway Overview