What Are 4G Communication Systems?

The maximum data transmission rate of 4G exceeds 100Mbit / s, which is 10,000 times the data transmission rate of mobile phones and 50 times the speed of 3G mobile phones. 4G phones can provide high-performance streaming media content and become personal identification devices through ID applications. It can also accept high-resolution movies and TV shows, making it a link in the new infrastructure that merges broadcasting and communications. In addition, some services such as 4G wireless instant connection will be cheaper than 3G. In addition, 4G is expected to integrate different modes of wireless communication-from indoor networks such as wireless local area network and Bluetooth, cellular signals, broadcast television to satellite communications, mobile users can roam freely from one standard to another.

4G mobile communication system

1897 was the first year of human mobile communication. MG Marconi completed a wireless communication experiment between land and a tugboat, thus unveiling the prelude to the history of mobile communication in the world.

While Long-Term Evolution (LTE) and WiMax are being vigorously promoted in the global telecommunications industry, the former (LTE) is also the most powerful

at

The 3G standards approved by the ITU are WCDMA, CDMA2000, and TD-SCDMA. Although 3G has many advantages compared to 2G, 3G still has many unsatisfactory aspects, such as: 3G lacks a global unified standard; the voice switching architecture adopted by 3G still inherits the circuit switching of 2G systems, instead of Pure IP method; 3G service provision and service management are not flexible enough; streaming media (video) applications are not satisfactory; 3G high-speed data transmission is immature and access rate is limited; there are too many algorithms in security and easy authentication protocols Attacked and other security flaws.

With the increasing number of wireless technologies, there is an urgent need to integrate these wireless technologies into a unified network environment. This is the super three generation mobile communication system (B3G) communication system and the future 4G communication system that are being formed. B3G and 4G communication systems will be the most suitable and best technologies in the future to provide broadband access, global seamless roaming and ubiquitous data, voice services, etc. ^[4]

4G is an abbreviation for the fourth generation of mobile communication and its technology. It is a technology product that integrates 3G and WLAN and can transmit high-quality video images, and the image transmission quality is comparable to high-definition television. The 4G system can download at 100Mbps, which is 2000 times faster than dial-up. The upload speed can also reach 20Mbps, and it can meet the requirements of almost all users for wireless services. In terms of the price that users are most concerned about, 4G is on par with fixed broadband networks in terms of price, and the billing method is more flexible, and users can fully determine the services they need based on their own needs. In addition, 4G can be deployed where DSL and cable modems are not covered, and then extended to the entire region. Obviously, 4G has incomparable advantages. ^[5]

2012.1.20 The 4G (IMT-Advanced) standard officially approved by the ITU: LTE-Advanced: LTE (Long Term Evolution,

For people, 4G communication in the future really seems very mysterious. Many people think that the fourth generation wireless communication network system is invented by human beings in history.

Clearwire said in January 2009 that it would put

4G development in China in 2013

China Mobile's 4G TD-LTE network construction will better protect people's public safety. As one of the cities for 4G TD-LTE network construction in Hangzhou, 4G has shown great power in many fields. To this end, the reporter made a special trip to the monitoring hall of the Urban Management Bureau of Hangzhou Jianggan District. The high-definition monitoring pictures of law enforcement vehicles and fixed monitoring points in the jurisdiction were transmitted back to the big screen of the monitoring hall in real time through the 4G network. At the same time, the accurate transmission of information is achieved.

It can be seen that the speed and intensity of China Mobile's 4G network construction will enter the fast lane this year. People in the industry said that 4G communication can meet the requirements of coverage, communication quality, and multimedia transmission that 3G communication cannot yet reach. 4G is gradually integrated into security The technology has a bright future. At present, China Mobile regards 4G network high-definition security applications as one of its key businesses to promote, which will surprise the security industry and also make a huge contribution to China's social and public security cause.

TD-LTE large-scale network construction will start

It is understood that China Mobile's 2013 TD-LTE scale-up experiment has officially started, with a construction scale of about 200,000 TD-LTE base stations and a total construction scale of 20 billion yuan. According to industry analysis, China Mobile Group s capital expenditure this year will be last year. On the basis of 127.4 billion yuan, a substantial increase of 49% to 190.2 billion yuan.

China Mobile Chairman Xi Guohua previously stated that China Mobile will expand the scale of the trial network construction in 2013, build the world's largest LTE network, and purchase more than 1 million TD-LTE terminals, promoting the maturity of TD-LTE multi-mode and multi-band terminals as soon as possible. Laying the foundation for business. ^[9]

On December 4, 2013, according to the announcement of the Ministry of Industry and Information Technology, China issued a 4G license, and the three operators will simultaneously obtain the first batch of 4G licenses, which is the TD-LTE standard. ^[11]