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SAE 
Gateway
PDN
ePDG
IP Networks
Serving
SGSN
3GPP LTE
GSM,HSPA,
TD-SCDMA
CDMA/
Trusted 3GPP
Non-trusted
3GPP
Operator’s IP
Services (IMS, PSS etc.)
Packet Data Network (PDN) SAE Gateway or PGW. So PGW is PDN SAE Gateway.
PGW is responsible to act as an anchor of mobility between 3GPP and non-3GPP technologies.

PGW provides connectivity from the UE to external packet data networks by being the point of entry/exit of traffic for the UE (User Equipment/mobile phone).

A UE may have simultaneous connectivity with more than one PGW for accessing multiple PDNs.

The PGW manages policy enforcement, packet filtration for users, charging support and lawful Interception.

Non-3GPP technologies are listed below :-
WiMAX, CDMA 1X and EvDO.

PGW is shown in diagram below:
PDN
Evolved Packet Core (EPC) system architecture for all IP.Mobility Management Entity (MME),
Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW.
Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG)
Multiple antenna techniques - MIMO, Adaptive antenna systems - AAS and Antenna diversity - AD

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PGW highlights:

Anchor for mobility in-between 3GPP and non -3GPP

 

It manages:

* Policy enforcement.

* Packet filtration for users.

* Charging support

* Lawful interception.

 

SGW.
ePDG.