What do G, E, 3G, H and other letters and symbols displayed next to the signal on the top of the smart phone screen mean? Let me explain to you here: G refers to 2G network; E refers to EDGE network, belonging to 2.75G; 3G refers to Unicom's 3G network; H refers to the 3G upgraded HSPA network, which is 3.5G. The four types of network speeds from slow to fast are G<E<3G<H. In addition, iPhone only displays 3G, even in H network, and sometimes it displays o, which means 2G network. When your mobile phone signal is unstable, it will switch between these three bands, ensuring the basic call requirements of your mobile phone.
In fact, there are T, H+and so on. With the coming of 3G era, three domestic network operators have launched their own 3G technologies. Usually, what we call "Tianyi" refers to the Tianyi 3G network launched by China Telecom, and the mode is CDMA; "G3" refers to the E-line 3G network launched by China Mobile in the form of TD-SCDMA; "Wo" refers to the 3G network launched by China Unicom, and the mode is WCDMA. CDMA and WCMDA are technologies imported from abroad, and TD-SCDMA is a technology independently developed by Chinese people.
China Telecom
China Telecom is one of the three operators with the most comprehensive network coverage. As early as October 2009, it completed the nationwide 3G network coverage, with a downlink rate of 9.3 Mbps and an uplink rate of 5.4 Mbps.
China Unicom
China Unicom is one of the three operators with the largest number of users. Because WCMDA is the most widely used network technology in the world, 95% of mobile phones use this network system. The future development direction is H+, that is, HSPA+.
China Mobile
China Mobile's TD-SCDMA technology is currently in its infancy. Although LTE (4G) in other countries has been very mature, China's TD is still a newborn, but after all, it is China's national independent intellectual property rights, so there is still much support. Different from China Unicom and China Telecom, due to the characteristics of the network itself, after the introduction of the 3G network adopting the TD-SCDMA standard, China Mobile will be closer to 4G in terms of network upgrade, that is, China Mobile will go beyond the HSPA stage. Its current upgrade network is called TD-LTE, which is also the "quasi 4G" standard.
summary
Compared with the 2G era, the different system networks held by operators in the 3G era make their differences more obvious and prominent, which means that in the 3G era, the competition among operators will be more intense, which is particularly evident in the network itself. Whether it is China Mobile, the leader of the 2G era, or China Unicom and China Telecom, which want to rise, they are fully equipped in the 3G era. At the same time, in order to ensure the leading edge in the network, the three operators coincidentally focused on the network upgrade. Therefore, we will see many concepts about 3G upgrade and even 4G network recently.
From the network conditions that the three major operators will develop this year, in terms of theoretical value, China Mobile's TD-LTE has outstanding uplink and downlink speed, followed by China Unicom and China Telecom. However, it should be noted that this is only a theoretical value and part of the test results, and it does not widely represent the rate and results after commercial use. Operators also need to consider many factors before they can finally launch the network for commercial use, and there is still a long way to go before people generally accept the new network. Finally, whether customers can be attracted to the network depends on the stability of the network, package price and other factors.
