In the early 1990s, Europe began to study the 4G mobile communication system, with the target rate of 100Mbps, and it is expected to be put into commercial use around 20 10.

In 2000, Japan set up a special committee to lead relevant Japanese government departments, university research institutions and industrial departments to conduct research on 4G systems and formulate relevant standards for 4G.

DoCoMo Company of Japan has successfully developed a 4G air interface experimental system including mobile terminals and base stations in 2002, and successfully carried out related transmission and experiments on this system.

Many organizations in the world are engaged in the research and standardization of 4G systems, such as IPv6 Forum, SDR Forum, 3GPP, Wireless World Research Forum, IETF (Internet Engineering Task Force) and MWIF (Mobile Wireless Internet Forum).

Extended data;

1) network structure;

The network structure of 4G mobile system can be divided into three layers: physical network layer, intermediate environment layer and application network layer. The physical network layer provides access and routing functions, which is completed by the combination of wireless and core network. The functions of the intermediate environment layer include QoS mapping, address translation and integrity management.

The interface between the physical network layer and the intermediate environment layer and their application environment is open, which makes it easier to develop and provide new applications and services, provides seamless wireless services with high data rate and runs in multiple frequency bands.

2) 2) Research and development of 4G;

From February 5438, 2006 to February 65438+February, 2003, the research on Beyond 3G/4G cellular communication air interface technology was carried out, the core software and hardware development of Beyond 3G/4G wireless transmission system was completed, the related transmission experiments were carried out, and relevant suggestions were submitted to ITU.

From 65438+ 10 in 2004 to 65438+2 in 2005, the research of Beyond 3G/4G air interface technology reached a relatively mature level, and the related overall system technology research (including the research of interconnection technology with wireless ad hoc networks and nomadic wireless access networks, etc.). ) has been carried out.

Complete networking test and demonstration business development, build a demonstration system beyond 3G/4G technical characteristics, and submit a preliminary new generation wireless communication system standard to ITU.

From June 5438+ 10 in 2006 to June 438+February 2000, a major project was set up to complete the research on the system standard of general wireless environment and its practical application, and to carry out large-scale field tests.

Reference source; Baidu encyclopedia -4 g