Introduction to Cellular and GSM Communications

This site is the information resource for Cellular and GSM Communications.

Each mobile uses a separate, temporary radio channel to talk to the cell site. The cell site talks to many mobiles at once, using one channel per mobile. Channels use a pair of frequencies for communication—one frequency (the forward link) for transmitting from the cell site and one frequency (the reverse link) for the cell site to receive calls from the users. Radio energy dissipates over distance, so mobiles must stay near the base station to maintain communications. The basic structure of mobile networks includes telephone systems and radio services. Where mobile radio service operates in a closed network and has no access to the telephone system, mobile telephone service allows interconnection to the telephone network.

To read more about Cellular Communications, click on one of the following topics:

  1. Mobile Communications Principles
  2. Mobile Telephone System Using the Cellular Concept
  3. Cellular System Architecture
  4. North American Analog Cellular Systems
  5. Cellular System Components
  6. Digital Systems
  7. Glossary

To read more about GSM communications, click on one of the following topics:

  1. Introduction: The Evolution of Mobile Telephone Systems
  2. GSM
  3. The GSM Network
  4. GSM Network Areas
  5. GSM Specifications
  6. GSM Subscriber Services
  7. Glossary

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