用处于移动蜂窝电话信号覆盖范围内的居民数除以总人口就可算出。
This is calculated by dividing the number of inhabitants within range of a mobile cellular signal by the total population.
此次信号覆盖范围包括二环、三环、CBD、金融街、中关村等地区。奥运期间此服务免费。
The service, free of charge during the Olympics, covers the Second and Third ring roads, CBD, Financial Street, and Zhongguancun.
现场运用表明，系统具有状态监测实时性强、信号覆盖范围广、信息传输灵活可靠、运营成本低的特点。
Field operation shows that such a system has the characteristics of strong real-time state monitoring, wide signal coverage, flexible and reliable data transmission and low operational cost.
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