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Enhanced Packet Data Gateway (ePDG)

ePDG is the part of SAE which interfaces with non-trusted 3GPP IP systems. It acts as a secure termination node for IPsec tunnels established with UE.  

What is un-trusted non-3GPP accesses?
When a network operator doubts on the secured interface of a technology its categorized as un-trusted. The very good example is of WiFi hotspot.   

PDN

IP Networks

Serving

SGSN

Operator’s IP
Services (IMS, PSS etc.)

LTE topics @ FCD
What is LTE? Key driving factors behind 4G technology.
LTE Data rates and comparison with 3G rates.
Difference between air, radio and core network..  
Seamless mobility in 4G.

IPsec stands for Internet Protocol Security. Its a set of  protocols to secure wireless communications by encrypting each packet transfer. This is only implemented for All-IP networks.  
EPDG is shown in diagram below:

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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Multiple cores from different networks can be integrated in a single LTE node. Enhanced back haul security through IPSec tunnels. Rapid packet processing. Real time subscribers, service and applications monitoring for in-line services.

What is IPSec for Internet Protocol?

Cloud Computing ?
Whenever a document or photo is uploaded on the web, a thread of cloud computing is active. Learn more from here.

Key Features of LTE EPDG :