BSS Description B10 (3FL10473A-ed 2)

1. Evolium BSS Introduction
Situation and Functions
ALCATEL BSS Description 18
Evolution to (E)GPRS
EVOLIUM
ALCATEL BSS Description
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The success of GSM has taken place in parallel with the explosion of interest in the Internet and related
data services. Presently, data transmission over the air interface is limited to 9.6 kbps, too slow for
use of graphics-intensive services.
GPRS
The solution chosen by ETSI for the double challenge of increased demand for data service and
pressure on radio resources is called General Packet Radio Service (GPRS). (without network
modification)
The GPRS network is called the GSS (GPRS Sub-System) or the GPRS “Core Network”.
GPRS is an IP network, and therefore contains routers = machines handling the packet switching
function.
GPRS is a solution to wait for UMTS without network modification
GPRS : maximum rate is 170 Kbps.
EGPRS
EGPRS (Enhanced GPRS) is based on TDMA and offers a maximum theoretical speed of 473 kbps,
using a new modulation 8-PSK, eight-phase shift keying.
EGPRS compatible MTs are required. The BSS remains the same, except for new EGPRS/GSM
compatible TRXs to be added to each cell where EGPRS has to be activated.
UMTS
UMTS (Universal Mobile Transmission System) requires a RAN based on W-CDMA, it is then called a
Radio Network Subsystem (RNS) and is part of the UTRAN (UMTS Terrestrial Radio Access Network)
All Rights Reserved © 2007, Alcatel-Lucent
3FL10473ADAAWBZZA Edition 02
EVOLIUM ALCATEL BSS Description Page 18