What is a trunked mobile communication system?

Trunking mobile communication system is an economical and flexible mobile communication system developed in 1970s, and it is an advanced development stage of traditional private wireless dispatching network. Clustering means that multiple wireless channels serve a large number of users, which is equivalent to applying the working mode of trunk line in program-controlled telephone to wireless communication system and distributing limited channel resources to all users of the whole system dynamically, automatically, quickly and optimally. It uses switching technology and advanced computer technology to provide powerful distribution capabilities for all users of the system.

A trunked mobile communication system generally consists of a control center that can be connected to the local telephone network, several base stations and many mobile terminals (mobile phones). The base station and the control center are connected through trunk lines, and each base station is provided with multiple channels by multiple receiving and transmitting devices, including control channels for control and management and channels for communication with terminals. Through the control channel, the mobile switching control center can make unified planning and reasonable management of the channels, base stations and services used by * * *, so as to achieve the purpose of enabling users to truly * * * enjoy multiple channels, * * use coverage areas, * * enjoy communication services and reduce costs. The transmitter and receiver of each base station have a communication range (coverage area), which is called wireless area. The range of wireless area is determined by the power of transmitter and the effective height of base station antenna. Communication between base stations is completed through trunk lines and control centers. Each mobile terminal (mobile phone) has a transceiver, which can exchange information with the base station. In this way, communication between any two mobile terminals can be realized in the whole service area (communication areas of all base stations) through the conversion of transmission signals among base stations, trunk lines and control centers, thus forming a self-contained mobile communication system-trunked mobile communication system.

The trunking mobile communication system has the advantages of convenient and flexible networking, reasonable price and high frequency utilization rate, which is suitable for China's national conditions and even has the function of transmitting data signals, fax signals and status signals. Therefore, it has developed rapidly in China and has become an important mobile communication system in China, which is widely used in all walks of life.