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greenfield project
In many disciplines a greenfield project is one that lacks constraints imposed by prior work. The analogy is to that of construction on greenfield land where there is no need to work within the constraints of existing buildings or infrastructure.
== Cellular networks ==
In wireless engineering jargon, a greenfield project could be rolling out the second generation of cell phone networks. The first cellular telephone networks were built primarily on tall existing tower structures or on high ground in an effort to cover as much territory as possible in as little time as possible and with a minimum number of base stations. These early wireless telephone network designs were later augmented with additional base stations and antennas to handle the growing demand for additional voice traffic and higher network capacity. As wireless networks quickly evolved, it was evident that the earlier designs constrained the growth of the network. As governments made more radio spectrum available for licensed wireless telephone operators in the late 1980s, entirely new networks were built that performed better than legacy networks because their designs were free from the constraints of existing systems. Today, any new network designed from scratch to enable new Radio Access Network technologies, such as 3G, 4G, and WiMAX are also referred to as greenfield projects.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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