PDN Gateway Overview
Product Description ▀
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
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Figure 2.
P-GW in the Basic E-UTRAN/EPC and eHRPD Network
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
Lawful Interception
UE IP address allocation
Packet screening
Transport level packet marking in the downlink;
Down link rate enforcement based on Aggregate Maximum Bit Rate (AMBR)
The following are additional P-GW functions when supporting non-3GPP access (eHRPD):
P-GW includes the function of a Local Mobility Anchor (LMA) according to draft-ietf-netlmm-proxymip6, if
PMIP-based S5 or S8 is used.
The P-GW includes the function of a DSMIPv6 Home Agent, as described in draft-ietf-mip6-nemo-v4traversal,
if S2c is used.