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一、公众移动通信的技术特点 典型的公众移动通信系统由移动电话交换局MSC(Mobile SwitchingCenter)、基站BS(BasicStation)、移动台MS(Mobile Station)及局间与局站间的有线与无线传输线路组成,如图1所示。移动交换局MSC,基站BS的功能是完成信息交换、接续以及对无线频道的控制。基站与移动台MS都设有收发信机,收发信双工器或多工器、天线,馈线等。根据基站的发射功率及天线有效高度,可决定每个基站覆盖小区的范围。由若干个小区组成移动无线电话网,而MSC再与公众市话局中继相连,便可完成移动用户与市话用户间的通话。
First, the technical characteristics of the public mobile communications Typical public mobile communications system by the mobile switching center MSC (Mobile Switching Center), base station BS (BasicStation), mobile station MS (Mobile Station) and interoffice with the station between the wired and wireless transmission Line composition, as shown in Figure 1. Mobile switching office MSC, base station BS’s function is to complete the exchange of information, continuity, and control of wireless channels. Both the base station and the mobile station MS are provided with transceivers, transceivers, duplexers or multiplexers, antennas, feeders and the like. Depending on the transmit power of the base station and the effective antenna height, the range of cells covered by each base station can be determined. The mobile radiotelephone network is composed of several cells, and the MSC is connected with the public telephone exchange trunk to complete the call between the mobile user and the local telephone user.