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Most people now use a cell phone as their primary contact device, so the're not very happy when they don't get coverage inside a building. In-building cellular systems can eliminate indoor coverage problems.
The cellular network was designed to provide outdoor - not indoor - coverage. While some buildings get good coverage from external cell towers, many others have spotty coverage because concrete, steel, and other building materials block cellular radio signals, or because the nearest external cell tower is just too far away. Even in buildings where there is adequate coverage near windows in exterior offices, the cellular signal often weakens as callers move toward the interior of the structure.
To remedy this problem, buildings are deploying inbuilding cellular systems. An in-building system consists of a carrier signal source and a distributed antenna system (DAS) that propagates the signal throughout the structure. The carrier signal source is either a base station deployed in the building's telecommunications room or a rooftop...