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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). The primary goals of this architecture was to achieve higher data rates, low latency, with support for multiple radio access techniques.

The technology is developed to support enhanced media centric services with highest level of QoE (Quality of Experience).
3GPP LTE Evolved Packet Core Architecture
Main components of EPC are listed below:-

Mobility Management Entity (MME),
High performance is a result of highly efficient and separate data and control paths and a flat IP core. The flattened out IP architect allows less number of software layers to traverse to process data. The EPC is evolved around new architectures of Mobility Management Entity (MME), Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW, Packet Data Network (PDN) SAE Gateway and Enhanced Packet Data Gateway (ePDG). Figure below shows the architecture of Evolved Packet Core or EPC.
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
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.)
EPC block diagram
Serving System (S) Architecture (A) Evolution (E)
Gateway or Serving Gateway SGW.
Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG)

IMS is IP Multimedia Switch
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