LTE is 4G, the so-called 4G on the two systems, one is FDD LTE, the current Unicom, Telecom is this system, there is a TDD LTE, the current mobile in the use of the difference between T and F is the difference between the time and frequency.
From the official commercialization of 4G so far has been several years past, now more and more cell phones began to support the full network pass, but when it comes to 4G most people only know that 4G or LTE, in fact, there are a lot of LTE inside the sub-division of the type.
From the three major domestic carriers to countless foreign carriers, and then the frequency bands used by various carriers are not the same, so how do you know that the 4G network you are currently using in the end is the kind of LTE, the next step is to start a long popularity.
First of all, LTE is divided into two systems: TDD and FDD. TDD is the LTE standard protocol dominated by our country, using time-division duplex mode. FDD is the LTE standard protocol dominated by the 3GPP has become the global operators of the **** the same choice, using frequency division duplex mode.
Simply put, TDD uses only one frequency band to complete uplink and downlink transmissions, using different time gaps to complete the uplink or downlink, the advantage is that it can save a lot of band resources, the disadvantage is that due to the need to calculate the time gaps that do not need to be used and fewer band resources compared to FDD, so TDD in terms of latency and bandwidth is inferior to FDD.
While FDD's FDD uses two different frequency bands for uplink and downlink {e.g. 1710-1755MHz for uplink and 1805-1880MHz for downlink}, which allows simultaneous transmission of both uplink and downlink, with the advantage of lower delay and higher bandwidth, but with the disadvantage of requiring a large number of different frequency band resources.
History of 5G development:
Mobile communication continues the law of development of technology generation every ten years, and has gone through the development of 1G, 2G, 3G and 4G. Each generational leap, each technological progress, have greatly contributed to industrial upgrading and economic and social development.
From 1G to 2G, the transition from analog to digital communication has been realized, and mobile communication has come into thousands of households; from 2G to 3G and 4G, the transition from voice to data services has been realized, and the transmission rate has been increased hundreds of times, which has contributed to the popularity and prosperity of the mobile Internet applications.
Currently, mobile networks have been integrated into all aspects of social life, profoundly changing people's communication, exchange and even the entire way of life.
4G network has created a prosperous Internet economy and solved the problem of people communicating with each other anytime and anywhere. With the rapid development of the mobile Internet, new services and new businesses continue to emerge, and the explosive growth of mobile data service traffic, the 4G mobile communication system is difficult to meet the needs of the future surge in mobile data traffic, and there is an urgent need to research and development of next-generation mobile communication (5G) system.
5G as a new type of mobile communication network, not only to solve the people and people communication, to provide users with augmented reality, virtual reality, ultra-high definition (3D) video and other more immersive and ultimate business experience, but also to solve the problem of people and things, things and things communication, to meet the needs of mobile medical care, automotive networking, smart home, industrial control, environmental monitoring, and other Internet of Things applications.
Eventually, 5G will penetrate all sectors of the economy and society, and become a key new infrastructure to support the digitalization, networking and intelligent transformation of the economy and society.
Reference: Baidu Encyclopedia-5G