Starting from the first-release versus Mobile WiMAX and LTE support added less than 1 Gbit / s peak bit rate, they do not completely IMT-Advanced compliant, but often labeled 4g lte network by service providers. According to the operator, referring to the deployment of next-generation network technology is backward-compatible non-new. On December 6, 2010, ITU-R claimed if all 2 technology, and other outside-the 3G technology that does not meet criteria for IMT-Advanced, can still calculated "4G," even if they represent a precursor to the IMT-Advanced compliant versus as well " substantially increase the level of ability and strength with respect to the initial third generation systems now deployed. "
Mobile WiMAX Release 2 (also known as WirelessMAN-Advanced or IEEE 802. 16m ') as well as the continuation LTE (LTE-A) that IMT-Advanced compliant versus match the above two system, standard throughout the spring of 2011, lte network the reference? As well as promising speed in the order of 1 Gbit / s. Desired service in 2013. The need update
As opposed to the first generation, the system does not support 4G service traditional circuit-switched telephony, but all-Internet communication protocol (IP) based on such as IP telephony. As seen below, the technology of radio spectrum used in the system of 3G, abandoned in all system candidate 4g lte and replaced by the transmission of OFDMA multi-carrier and other frequency-domain equalization (FDE) scheme, until it is possible to transfer the bit rate is so high despite extensive multi-path radio propagation (echo). Levels peak bit further enhanced with smart antenna array for multiple-output (MIMO) communications multiple-input.