1. High coverage rate. On the one hand, the range of coverage is large enough. On the other hand, the scope of coverage includes indoor. Most of the time users use this function in the room, from high -rise buildings and underground facilities to ensure coverage to every corner. According to the scope of the coverage rate, mobile phone positioning can be divided into three types of coverage services: the entire local network, covering some local networks, and providing roaming network services types. In addition to considering the coverage rate, the environmental factors of the network structure and dynamic changes may also make a telecom operator unable to guarantee services in local or roaming networks.

　　Second, positioning accuracy. Mobile phone positioning should provide different accuracy services according to the different user service needs, and can provide users with the right to select accuracy. For example, the probability of positioning accuracy launched by the US FCC is 67%within 50 meters, and the probability of positioning accuracy within 150 meters is 95%. On the one hand, the positioning accuracy is related to the positioning technology adopted, and it depends on the external environment of the business, including the radio communication environment, the density and geographical location of the base station, and the equipment used in positioning.

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