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In In-building WLAN and Building-to-building WLAN, we say that we should have Line of Sight (LoS) between the two wireless devices.But in the case of mobile (cellular) phones network, the cellphones do not have a Line of Sight with its respective tow...
Even in case of cellular network we need LoS...All of us notice that the cell towers ae erected on roof tops of high rised buildings...Also, the number of cell towers are comparatively high so that the range of each tower is within the reach of anot...