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Home LTE Home 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
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Core Network Interface :-
4G IP core network is purely packet based and doesn’t involve any switching between packet-switched and circuit-switched networks. This setup is proven in field trials to be low cost and easily expandable.  Next Air Interface
Air interface :-

The 4G technologies are developed entirely on OFDM standard. The higher data rates are achieved on air interface using multiple antennas.  The other features of 4G air interface is the wide range of frequency scalability. The range is between 1.25 Mhz channel to 20 MHz.  The highest throughput of 100 Mbps Downlink and 50 Mbps Uplink is possible only in 20 MHz band with multiple antenna support.
Next Radio Network
Radio Network :-

An all IP (or flat) network architecture provides reduced data latency, maximum flexibility, simplification of networks,  improved scalability and leverage of existing IETF standards.

Data latency is the transmission delay between the transmitter sending data and receiver getting data. In LTE it is reduced by managing most dynamic decisions locally at the mobile.  

Simplification of networks is done by decoupling of users and control planes.    
Core, Air and Radio (CAR) interfaces in 4G.
Introduction to System Architecture Evolution (SAE).
System Architecture Evolution (SAE) Introduction :-

System Architecture Evolution or SAE is a technique for the core network which reduces the number of network nodes involved in data processing and transport. A SAE network has two types of network elements to support user and control planes.

1. Enhanced Node B or eNodeB - This is an enhanced Base station terminal to provide LTE air interface and manages radio resources.

2. Access Gate Way (AGW) - click here for details.