Because of the building block and the wall attenuation inside the large stadium (exhibition), the most indoor regions are the signal weak zones, and basements or elevators are the mobile signal dead zones.
Due to the obstruction of the mountains and ground almost all urban metro are mobile signal dead zones along the lines of highway, railway and metro, The people stream and traffic volume in metro is huge, the traffic load is considerable.
As a result of the building shielding, low coverage rate, the low access successful rate, the low voice quality, the high call drop rate and so on, which become the new network question in the residence district.
In some sections along highway and railway the communication signals blocked by mountain or other obstruction, the network coverage towards highways and railways has some breakpoints.
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