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With the rapid development of communication technology and the continuous improvement of social informatization, mobile communication methods have Comprehensive popularization, based on the first generation analog mobile communication system (FDMA) and the second generation digital mobile communication system (TDMA), has entered the era of the third generation mobile communication system (CDMA), which is what people call it daily In the 3G era, the 3G systems currently operating in our country include CDMA2000, TD-SCDMA and WCDMA, which are operated by China Telecom, China Mobile and China Unicom respectively.
With the development of mobile communication technology, people's requirements for mobile communication terminals are getting higher and higher. From the initial first-generation analog mobile phones that can only support voice calls, to the second-generation digital mobile phones that can support text messages, GPRS and other data services, to the current third-generation mobile communication phones that can support various broadband network services, mobile communications The system has been able to support various digital services and has fully connected with the computer network system. As far as the mobile communication terminal itself is concerned, its size, weight, and functions have also undergone tremendous changes. With the emergence of smart phones and the continuous improvement of functions, current mobile phones can handle various tasks while maintaining their original communication functions. data, text, video and various computer programs, it has become a handheld PC terminal