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Mobile communication, in English, refers to the communication between mobile bodies, or the communication between mobile bodies and fixed bodies. The moving body can be a person, or it can be a car, a train, a ship, a radio, and other objects in a moving state. Mobile communication is a modern technology for wireless communication, which is one of the important achievements of the development of electronic computers and mobile Internet. After the development of the first generation, the second generation, the third generation and the fourth generation, the mobile communication technology has entered the era of the fifth generation development (5G mobile communication technology). In the past half century, the development of mobile communication has had a profound impact on people's life, production, work, entertainment and even politics, economy and culture. 30 years ago, the fantasy of drones, smart homes, online video, online shopping and so on have been realized.

Second, what is the principle of mobile communication? Mobile communication can achieve long-distance communication, what is the principle? Mobile communication uses smart devices such as mobile phones as mobile communication devices. In communication, it is necessary to establish a connection with the nearby base station first, and then access the core network to find the communication destination. In the above process, all information is carried and transmitted through electromagnetic waves. The electromagnetic frequency band used by the mobile phone is related to the standard used by the mobile phone and the operator. However, in general, the electromagnetic frequency bands used by telecom operators are generally distributed in the range of 850-4900MHz.

Third, what are the characteristics of mobile communication

1, mobility to maintain the object in the mobile state of communication, so mobile communication must be wireless communication, or a combination of wireless communication and wired communication.

2, radio wave propagation conditions complex moving body may move in various environments, electromagnetic wave propagation will produce reflection, refraction, diffraction, Doppler effect and other phenomena, resulting in multipath interference, signal propagation delay and broadening effects.

3, noise and interference serious in the urban environment of automotive spark noise, various industrial noise, intermodulation interference between mobile users, adjacent channel interference, same frequency interference, etc.

4, complex system and network structure Mobile communication is a multi-user communication system and network, must not interfere with each other between users, can work in harmony. In addition, the mobile communication system should also be connected with the local telephone network, satellite communication network, data network, etc., the whole network structure is very complex.

5, high frequency band utilization, good equipment performance in order to better achieve mobile communication.