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鉴于中国联合通信公司(以下简称中国联通)800MHz频段CDMA数字蜂窝移动通信系统(以下简称CDMA系统)基站发射频段为870-880MHz，中国移动通信集团公司(以下简称中国移动)的900MHz频段GSM数字蜂窝移动通信系统(以下简称GSM系统)基站接收频段885-909MHz, 两系统之间只有5MHz保护带
In view of the 800MHz band CDMA digital cellular mobile communication system (hereinafter referred to as CDMA system) of China United Telecommunications Corporation (hereinafter referred to as China Unicom) transmitting band of 870-880MHz, the 900MHz band GSM digital cellular of China Mobile Communications Corporation (hereinafter referred to as China Mobile) Mobile communication system (hereinafter referred to as the GSM system) base station to receive the band 885-909MHz, only 5MHz between the two systems protection band