Cellular Technical Information
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(Please note, this page and its linkes are not yet complete.)

Mobile phones transmit and receive voice and data signals using radio waves. These transmissions occur on a particular set of frequencies, using specific protocols. Since it is necessary for a mobile phone system to support more than one conversation at a time, each protocol uses a multiple access method, in order to accommodate multiple users.

The main thing that makes large-scale mobile phone networks possible, and the reason that they are sometimes called "cellular" phone systems, is the concept of frequency re-use. (It would be a good idea to read the page on frequency re-use before continuing with the rest of the information on this page.)

Frequencies, Multiple Access Systems, and Protocols: