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多种多样的ＧＳＭ业务孙茂琰移动用户对电话和非话业务的需求，是移动通信系统发展的重要因素。ＧＳＭ系统的主要目标在于给用户提供更广泛的业务项目，通过与不同固定网（公用电话交换网ＰＳＴＮ、综合业务数字网ＩＳＤＮ及公用数据网ＰＤＮ）的用户连接来实现。ＧＳＭ系...
A Variety of GSM Services Sun Maoyan Mobile users’ demand for telephony and non-speech services is an important factor in the development of mobile communications systems. The main goal of the GSM system is to provide subscribers with a wider range of business items through subscriber connections to different fixed networks (Public Switched Telephone Network PSTN, ISDN and Public Data Network PDN). GSM system ...