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在第２代移动通信技术中，ＧＳＭ系统占据了技术的主导。从２０世纪９０年代以来，ＧＳＭ系统也主宰了主要的移动通信市场。但是，随着人们的通信需求由普通的话音服务转向包括数字、图像、因特网等的多媒体服务，传统的ＧＳＭ系统网络在传输速率等方面要满足这些新业务需要则
In the second generation mobile communication technology, the GSM system occupies the leading position of technology. Since the 1990s, the GSM system has also dominated the major mobile communications markets. However, as people’s communication needs are shifted from ordinary voice services to multimedia services including digital, video, Internet and the like, the traditional GSM system network needs to meet these new service needs in terms of transmission rate and the like