I have been engaged in communication for many years. From the job category, there are many jobs related to communication, such as 2G-4G. There are too many differences, but in the vernacular, it is actually very simple:
1 and 2G are voice call systems, mainly GSM in European standards and CDMA in North America.
2.3G adds data transmission and excuse protocols based on voice calls, mainly WCDMA and TD-SCDMA.
There are some big differences between 3.2G and 3G, that is, the transmission categories are increased and the channels are enhanced.
4. In fact, there is little difference between 4G and 3G, that is, it increases the transmission speed and scale. Specifically, the transmission speed of 4G is 3-5 times that of 3G, which intuitively shows that mobile phones have faster Internet access, just like dual-core and quad-core computers.
5. The above is the general difference, but the specific operation of wireless is very different, mainly the difference of equipment and interface protocol. For a simple example, computers or telephone lines have designated interfaces and cannot be plugged in casually. Wireless interfaces are protocol-based and invisible, so they are all different.
6. If you need to learn, it is recommended to learn from scratch. How wireless develops should be based on the 2G system, just like the development of computers. No matter how the speed and function change, the hardware and operating system are the same. The specific operation is really different, but the principle remains the same.
The above hand-patting is purely a suggestion. It's up to you to decide whether you need training or study. I hope I can help you ~