Influence factors to GSM signal have?

Influence factors to GSM signal have?
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China mobile base area of the system, the coverage several KM; The regional system and unicom, can cover dozens of KM; Radiation frequency size and energy decided to coverage.
From another Angle, by the point of view of the conservation of energy analysis: cell phone radiation of the large base station radiation small (GSM), and cell phone radiation of the small base station radiation (CDMA)
Generally divided into the following several system: transmission system, including SDH equipment, optical fiber, cable, etc.; The power system, storage battery, the utility, etc.; Move ring monitoring systems; Day feedback system; BTS Lord equipment; And other auxiliary equipment, such as air condition, security doors, and so on
GSM900 and DCS1800 is normally we speak of excited network, they are all GSM standards. Two system function the same, the main frequency is different, GSM900 work in the 900 MHZ, 1800 MHZ in DCS1800 work. China's most