U-PCSUnlicensed Personal Communication System (also abbreviated UPCS)
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It is difficult, therefore, to determine whether the addition of the third distinguishing feature--the requirement of a particular industry-agreed protocol--would have independently stymied the development and deployment of devices because it would limit the economies of scale of device chipsets to only the number of U-PCS devices sold.
Two important lessons come out of the U-PCS band experiment.