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Long Term Evolution a 4G technology
Evolved Packet Core (EPC) system architecture for all IP.
LTE is all-IP advanced core architecture proposed in release 8 of 3GPP to only process packets. The core is named as Evolved Packet Core (EPC).
Mobility Management Entity (MME).
During hand over a UE is switched from source eNodeB to a target eNodeB. The reason of handover is related to mobility of the UE across the cell boundary. Example is of a UE in a moving vehicle.
Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW. SGW is responsible for handovers with neighboring eNodeB’s.
Packet Data Network (PDN) SAE Gateway
PGW is responsible to act as an anchor of mobility between 3GPP and non-3GPP technologies.
What is LTE? Key driving factors behind 4G technology. LTE (Long Term Evolution) is a fourth generation (4G) standard for broadband mobile technology. This standard is developed to meet long term future requirements of higher data rates, lower latency, better cell coverage and seamless handover.
LTE Data rates and comparison with 3G rates.
Seamless mobility in 4G. All IP is a unified network core for wireless operators to handle both voice and data. If the approach of unified core of all IP is adopted across majority of carriers globally, then mobility will become seamless.  
Difference between air, radio and core network.
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.  




UMTS LTE Interfaces in details
Interview Questions. Main, FPGA, Digital Fundamentals
LTE Intro Data rates CAR of 4G SL Mobility EPC Arch Interfaces LTE Cells Multi Antenna Access Tech LTE Frame Alt Frame PHY Layer LTE vs. CDMA LTE or WiMax LTE VOIP
LTE X2 interface and comparison with S1