Cellular Definitions (A)


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ACU
Antenna Combining Unit

ADPCM
Adaptive Differential Pulse Code Modulation; a form of voice compression that typically uses 32kbit/s

AFC
Automatic Frequency Control

AGCH
Access Grant Channel; downlink only, BTS allocates a TCH or SDCCH to the MS, allowing it access to the network

A-GPS
Assisted GPS, enhances the startup performance of a GPS satellite-based positioning system. It is used extensively with GPS-capable cellular phones after launching a 911 emergency call it would take the receiver several minutes to establish a fix (cold start) and being able to output the caller’s location co-ordinates

Air interface
In a mobile phone network, the radio transmission path between the base station and the mobile terminal

A-interface
Interface between the MSC and BSS in a GSM network

AM
Amplitude Modulation

AMPS
Advanced Mobile Phone System, the analogue mobile phone technology used in North and South America and in around 35 other countries. Operates in the 800MHz band using FDMA technology

AMR
Adaptive Multi-Rate codec. Developed in 1999 for use in GSM networks, the AMR has been adopted by 3GPP for 3G

Analogue
The representation of information by a continuously variable physical quantity such as voltage

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