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我国移动通信业正在迅猛发展,至1998年年底我国移动电话用户总数已突破2400万户,跃居世界第二。随着移动电话入网费的下调,移动电话的用户数更进一步增长,这就造成了工作于单一900MHz频段的GSM900网络的容量接近饱和,导致系统堵塞和漏话问题时有发生。为了解决容量受限问题,就有必要开发新的通信频段,因此工作于1800MHz频段的(GSM1800)网络系统应运而生,电信营运部门把GSM1800网与现有的GSM900网迭加,构成GSM900/GSM1800双频网络。双频网络的最大优点是能够在GSM
China’s mobile communications industry is rapidly developing, to the end of 1998 the total number of mobile phone users in China has exceeded 24 million, ranking second in the world. With the reduction of mobile phone network access fees, the number of mobile phone users has further increased, resulting in the capacity of the GSM900 network operating in a single 900MHz band to be near saturation, which has caused problems of system congestion and missed calls. In order to solve the problem of limited capacity, it is necessary to develop a new communication frequency band. Therefore, a (GSM1800) network system operating in the 1800 MHz frequency band has emerged. The telecom operation department superimposes the GSM1800 network with the existing GSM900 network to form a GSM900 / GSM1800 Dual-band network. The biggest advantage of dual-band network is able to GSM