Cisco ASR 5000 Series User Manual

Serving Gateway Overview
▀ Product Description
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
Figure 154. Basic E-UTRAN/EPC and eHRPD Network Topology
Internet
Enterprise
eAN/ePCF
A10/A11
SGi
eHRPD
S2a
Gxa
STa
E-UTRAN
EPC
P-GW
S1-U
S5/S8
S11
Gx
Gxc
S1-MME
eNodeB
S6a
MME
PCRF
3GPP
AAA
S6b
SWx
HSS
OFCS
Rf / Gz
Rf
S101
S103
HSGW
OCS
Gy
S-GW
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
path.
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 Specifications

General

Brand	Cisco
Model	ASR 5000 Series
Category	Network Router
Language	English