Since I had 3G, Imagination and construction of 4G have begun. Nowadays, 3G networks are in full swing, and the three major operators continue to lower their tariffs for their own advantages and attract users to expand their market share. At the same time, 4G networks are not to be outdone, in Guangzhou, Hangzhou, Shenzhen, Nanjing, Beijing, etc. The ground is constantly testing and a 4G network experience center has been established in Ningbo, Zhejiang Province. In today's 3G has not yet effectively popularized, what is the concept of 4G network?
4G network
TD-LTE is a new generation of broadband mobile communication technology dominated by China. As a follow-up evolution technology of TD-SCDMA, an international intellectual property 3G standard, we call it the fourth generation (4G) wireless communication standard.
However, 4G communications have not evolved from the simple upgrade of 3G communications. Their core construction technologies are fundamentally different. 3G mobile communications systems mainly use CDMA as the core technology, while 4G mobile communications system technologies are Multi-task crossover technology (OFDM) is the most attention.
4G network will realize the incompatibility problem of 3G network system
Its signal depth coverage capability is much higher than that of existing 3G networks, and its network speed can reach 10 times more than 3G. It also has a significant improvement over 3G networks in terms of delay. In the fixed state, the current TD-LTE download speed can be up to 100Mbps, and generally can be stabilized at 70 ~ 80Mbps. According to AT&T executives who study 4G communications, it is estimated that each 4G channel will occupy 100 MHz of spectrum, which is equivalent to 20 times that of W-CDMA 3G network.
While covering different types of communication interfaces, the use of wireless frequencies is much more efficient than second- and third-generation systems. It took less than 1 second to download a 7M high-quality song and download a 40G Blu-ray 3D video in less than 2 hours.
Rate comparison
China’s dominant TD-LTE is still in trial operation in a few cities, and the corresponding terminal equipment market is also difficult to buy. At present, China's 3G users (China Unicom (microblogging)) have exceeded 100 million, and TD-SCDMA users (China Mobile (microblogging)) are few. China Mobile is speeding up the construction of 4G networks in order to recoup its losses in TD-SCDMA.
Many people know that 3G mobile phone users can conduct mobile communications on a global scale. However, because there is no uniform international standard, various mobile communication systems are incompatible with each other, which brings inconvenience to mobile phone users. However, 4G is different. The networks of the three major operators can all be smoothly upgraded to 4G standard.
According to the current plan, China Mobile will experience TD-SCDMA, LTE TDD, and LTE FDD evolved to 4G in three phases. China Unicom will also evolve from WCDMA, HSDPA, HSPA+, and LTE TDD to 4G, and China Telecom (microblog) will enter the LTE FDD network from CDMA200. In this case, LTE FDD will be unified in the 4G era. The network standard is not only a good thing for consumers, but also a lot of technical barriers for operators.
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