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一、概述近年来,我国不少专辑、杂志等刊物,对国外移动通信作了大量介绍。有些部门也引进了一些国外小容量移动通信系统设备,为我国移动通信的发展,提供了良好的借鉴。国外移动通信的发展极为迅速,其发展过程大约如下:频段使用,由短波、超短波到微波;通信方式,由原单工系统到双工多信道系统;为提高频谱利用率和扩大用户容量,由大区制到普遍使用的小区制;覆盖面,由覆盖局部地区到覆盖全省,甚至全国。先进的移动通信网系统,大量采用了大规模集成电路和微处理机,实现了寻呼、原呼、信道分配、信息交换、过界切换、功率调整、游动用户定位等高度自动化手段。设立有存储程序控制的中央计算机的交换中心。
I. Overview In recent years, many publications, magazines and other publications in our country have introduced a large number of foreign mobile communications. Some departments also introduced some foreign small capacity mobile communication system equipment, which provided a good reference for the development of China’s mobile communication. The development of foreign mobile communications is extremely rapid, and its development process is as follows: the use of the band, from shortwave, ultrashortwave to microwave; communication, from the original simplex system to duplex multi-channel system; in order to improve spectrum utilization and expand user capacity, District system to the common use of community system; coverage, covering some areas to cover the province, and even the whole country. Advanced mobile communication network system, extensive use of large-scale integrated circuits and microprocessors, to achieve paging, the original call, channel allocation, information exchange, border switching, power adjustment, roaming user positioning and other highly automated means. Set up a central computer exchange with storage program control.