Glossary definition of Advanced Mobile Phone Service

Also known as: AMPS

Advanced Mobile Phone Service (AMPS) is a first generation analogue cellular telephone system that originated in the USA in the 1980s. AMPS is still the most widely deployed cellular system in the United States, and has been used in other countries of North and South America, as well as the Asia / Pacific region, although it is not compatible with European mobile phone standards. AMPS can be found in countries such as Canada, Australia, Hong Kong, New Zealand, South Korea, Singapore, Taiwan, Thailand and Israel.

AMPS operates in the 800 and 900 MHz frequency bands. Frequency Division Multiple Access (FDMA) is used to divide each band of operating frequencies into 30 kHz channels. Adjacent cells will then employ different channels for their transmitted and received signals, so that one cell does not interfere with another, and as a user moves between cells the channels change without any noticeable transition.

AMPS was updated with digital cellular service, i.e. digital AMPS (DAMPS), by adding Time Division Multiple Access (TDMA) to each channel.