Advertisement
3-A
3GPP
3rd Generation Partnership Project. 3GPP's organisational partners have
agreed to cooperate in the formulation of technical specifications for a third
generation mobile system based on further evolved GSM core networks and
radio access technologies.
3GPP2
3rd Generation Partnership Project 2. 3GPP 2 is an effort spearheaded by the
International Committee of the American National Standards Institute's (ANSI)
board of directors to establish a 3G Partnership Project (3GPP) for evolved
ANSI/JIA/EIA-41 "Cellular Radio Communication Intersystem Operations" network
and related RTT.
3GPP RELEASE 99
3rd Generation Partnership Project specification scheduled for release at the end
of 1999. The first commercial UMTS systems will essentially be implemented
according to this specification.
AAC
The MPEG-2 AAC (Adaptive Audio Coding) is a new audio coding standard used
in digital television systems. According to listening tests, AAC provides the same
sound quality as MP3 (MPEG1 Layer 3) with only 70% of the MP3 bit rate.
AMPS
Advanced Mobile Phone Service. Analogue cellular communications system
developed and used in the US, and which operates in the 8OOMz band. AMPS
covers the entire country, and is utilised by 80% of US mobile phone subscribers.
It has been introduced into the UK and Japan in slightly modified form as the
TACS system.
AMR
Advanced Multi Rate codec. During 1999, ETSI standardised this new speech
codec for GSM. The codec adapts its bit-rate allocation between speech and
channel coding, thereby optimising speech quality in various radio channel
conditions. For this reason, 3GPP (under which the next stage GSM speech
quality will be realised) has selected the AMR codec as an essential speech codec
for the next generation system. AMR was jointly developed by Nokia, Ericsson
and Siemens.
ANSI
American National Standards Institute. ANSI is a nonprofit organisation in the US
which pursues standardisation within the industrial sector. It is also a member of
ISO (International Standard Organisation). ANSI itself, however, does not
establish standards. Instead, it assists in reviewing proposals put forth by various
standardising bodies in the US and accordingly assigns a category code and
number after approval.
8
Advertisement
