4G communication Technology----Series (3)
This article uses 4G to reference ITU-R as defined by IMT-Advanced. The IMT-Advanced cellular network system must meet the following requirements:
Based on All IP packet-switched networks.
Achieve speeds of about 100 Mbit / s in high-speed mobility environments such as mobile access; up to about 1 Gbit / s in low-speed mobility environments such as peak data rates for nomadic / fixed wireless network access.
The ability to dynamically share and utilize network resources to support simultaneous use of multiple users per unit.
Use 5-20MHz scalable channel bandwidth, optionally up to 40MHz.
The peak spectral efficiency of the link is 15 bit / s / Hz (downstream) and 6.75 bit / s / Hz (upstream) (ie, it should be possible to exceed the bandwidth of less than 67 MHz in 1 Gbit / s downlink).
The system's spectral efficiency is as high as 3 bit / s / Hz / cell and 2.25 bit / s / Hz / cell indoors. 
Smooth switching across different system networks.
Provide high-quality service QoS (Quality of Service), in order to support a new generation of multimedia transmission capabilities.
In September 2009, the technical proposal was submitted to the International Telecommunication Union (ITU) as a 4G candidate.Basically all the suggestions are based on the following two technologies:
LTE-Advanced (3GPP Release 10) is standardized by 3GPP
WirelessMAN-Advanced (IEEE 802.16m) is standardized by the IEEE