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一、前言人们把现行的模拟汽车电话系统看作是第一代,则欧洲各国目前正在致力开发的欧洲统一数字蜂窝移动通信系统就是第二代。在由欧洲各国邮电部主办的欧洲邮电会议(CEPT)上,以实现欧洲统一的移动通信系统为目标,组成了特别移动通信研究小组(GSM),集中精力研究以900MHz频段为对象的数字移动通信方式。在GSM中起到主要作用的北欧各国(瑞典、挪威、芬兰、丹麦、冰岛)同西德、法国一起,主办
I. INTRODUCTION People consider the current analog car phone system as the first generation, and the European unified digital cellular mobile communication system currently being developed by European countries is the second generation. At the European Conference on Post and Telecommunications (CEPT) hosted by the European Ministry of Posts and Telecommunications, a special mobile communications research group (GSM) has been formed to achieve a European unified mobile communications system, concentrating on the study of digital mobile communications the way. The Nordic countries that play a major role in GSM (Sweden, Norway, Finland, Denmark, Iceland), together with West Germany and France, host