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AB
Access Burst; used for random access and characterized by a longer guard period to allow for burst transmission from a MS that does not know the correct timing advance when first contacting a network.
A-bis
Interface between the BSC and BTS in a GSM network.
ABR
Available Bit Rate.
ACU
Antenna Combining Unit.
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-interface
Interface between the MSC and BSS in a GSM network.
Air interface
In a mobile phone network, the radio transmission path between the base station and the mobile terminal.
AMPS
Advanced Mobile Phone System, the analog mobile phone technology use d in North and South America and in around 35 other countries. Operates in the 800 MHZ 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.
API
Application Program Interface.
APN
Access Point Name is a reference to the GGSN to be used.
ARPU
Average Revenue Per User an important financial performance indicator in the telecom market. Due to increased competition, voice services ARPU in most markets has been constantly degrading in the last three years. Mobile data service revenues are expected to be a key driving factor in supporting and increasing operatorss ARPU.
ASCII
American Standard Code for Information Interchange.
ASIC
Application Specific Integrated Circuit.
Asymmetric Transmission
Data transmissions where the traffic from the network to the subscriber is at a higher rate than the traffic from the subscriber to the network.
A-TDMA
Advanced Time Division Multiple Access.
ATM
Asynchronous Transfer Mode; a multiplexed information transfer and switching method in which the data is organized into fixed length 53-octet cells and transmitted according to each application's instantaneous need.
Attenuation
A decrease in signal magnitude between two points. These points may be along a radio path, transmission line or other device.
AUC
Authentication Center; the element within a GSM network that generates the parameters for subscriber authentication.
Authentication
Process of validating a userrs login information.

The list of terms for mobile cellular communication is for our visitors. The Glossary is intended for educational purposes only.

While we have taken great care to insure that all terms are accurately defined, we assume no liability for mentions or omissions that may involve alternate descriptions.