â–„ Cisco ASR 5000 Series Product Overview
Figure 129. Basic E-UTRAN/EPC and eHRPD Network Topology
Internet
Enterprise
eAN/ePCF
A10/A11
SGi
eHRPD
S2a
Gxa
STa
E-UTRAN
EPC
S-GW
S1-U
S5/S8
S11
Gx
Gxc
S1-MME
eNodeB
S6a
MME
PCRF
3GPP
AAA
S6b
SWx
HSS
OFCS
Rf
Rf
S101
S103
HSGW
OCS
Gy
P-GW
Another key role of the P-GW is to act as the anchor for mobility between 3GPP and non-3GPP technologies such as
WiMAX and 3GPP2 (CDMA 1X and EvDO).
P-GW functions include:
Mobility anchor for mobility between 3GPP access systems and non-3GPP access systems. This is sometimes
referred to as the SAE Anchor function.
Policy enforcement (gating and rate enforcement)
Per-user based packet filtering (deep packet inspection)
Charging support