Case Illustration: Multi-Mode Mobile Telephone
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Product History

photo of a man on an old cell phone and a man on a new cell phoneMobile (cellular) telephones sit at the end of a radio frequency air interface that is completely specified by governmental regulation/standards (mandatory) for the spectrum allocation and on industry standards relative to bandwidth and functional capabilities.

As covered in more detail in the mobile (cellular) domain tutorial, the mobile phone air interface is now entering into its third technical generation, called 3G wireless. This phase has been characterized by the development of two dominated technologies: CDMA2000 and WCDMA.

For an in-depth discussion of the development of cellular telephony, please consult the Tutorial “The Role of Standards in Cellular Telephony.”

Schematic of the Frequency Allocations for the Radio Spectrum in the United States

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Source: U.S. Department of Commerce

Schematic of the Wireless Services Portion of the Radio Frequency Spectrum Allocation in the United States

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Source: Telecommunications Industry Association

Courtesy of Dan Bart
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