Uplink and downlink speeds of 3G and 4G mobile phones.

4G is the abbreviation of the fourth generation mobile communication technology, and the network speed can reach ten to dozens times that of 3G network. Among them, TD-LTE is one of the new generation wireless broadband communication standards with high bandwidth and high quality, which has the characteristics of high speed, low delay and internationalization.

Compared with 3G, the characteristics of LTE can be summarized as "more", "faster", "better" and "less".

"Multi-type services": LTE can not only support voice, short messages and multimedia messages under 2G/3G networks; At the same time, it can also support high-bandwidth real-time services such as high-definition video conferencing, real-time video monitoring and video scheduling.

Internet access speed is "fast": the peak rate of LTE can reach more than 100 megabytes, which is more than 5 times of the current 3G speed.

User perception is "good": the delay of LTE network is even lower than that of 3G network, which is especially good for online games, real-time video transmission and other services with high real-time requirements.

"Saving" of spectrum resources: Compared with 3G, LTE can use six bandwidths: 1.4, 3, 5, 10, 15 and 20Mhz for networking, and the spectrum utilization rate is higher than 3G, so it can make better use of the very valuable frequency resources at present.

For example, at present, the peak speed of mobile 4G network can reach 100MB bps in an ideal state (generally abbreviated as Mbps, that is, the transmission speed per second is 12.5MB, and it takes 700/ 12.5=56 seconds to download a 700MB movie. However, due to the terminal capacity and network configuration, the downlink network speed can generally reach 60-80 Mbps, so it takes more than 1 minute to download a 700MB movie.