Migration from 2G to 3G in
South Africa
S.A. progress: Roadmap from GSM to UMTS
Service Capability
GSM
GSM Phase 2
GSM Phase 1
1994
advanced
GSM
GSM Phase 2, 5
GSM Phase 1
2002
UMTS Introduction
UMTS Mass Market
basic UMTS
GSM Phase 2, 5
GSM Phase 1
advanced UMTS
GSM Phase 2, 5
GSM Phase 1
IN FUTURE
IN FUTURE
Year
Standard services
max. 9.6 Kb/s
New services
(HSCSD, GPRS)
about 100 Kb/s
Flexible narrowband and
Enhanced multimedia
wideband services on
services with full roaming
demand from 8kb/s to 2Mb/s through different networks
single mode terminals
(multimode terminals)
single mode terminals
multimode terminals
single mode terminals
multimode terminals
(adaptive terminals)
single mode terminals
multimode terminals
adaptive terminals
è Evolution Path towards UMTS due to Market Demand
WRC-2000 IMT-2000 Frequencies
•
GPRS: a new data service in GSM
HLR
Visited
MSC/VLR
Sie
me
ns
Mobile DTE
BSS - Base Station System
HLR - Home Location Register
VLR - Visitor Location Register
Gateway
MSC
ISDN
BSS
BSS
PCU
PSTN
packet switched: GPRS
Serving
Serving
GSN
GSN
GSN - GPRS Support Node
PCU - Packet Control Unit
Gateway
Gateway
GSN
GSN
Internet
Intranet
PSPDN
Disadvantages of current situation
l Disadvantages for user
- Restricted user data rate (9.6kBit/s)
- Calls routed over the PSTN / ISDN to the data networks:
higher price (PSTN access as transit network)
- Subscriber will be charged for connection time, not for usage
- Long call setup time ca. 20s (modems)
- Restricted length of SMS
l Disadvantages for operator
- No efficient resource management possible
- Restricted number of user
- SMS is not an ideal match for many applications
No
Nopossibilities
possibilitiesto
topush
pushdata
dataservices
servicesas
asaamass
massmarket
market!!
6.2
GSM Phase 2.5 addresses the disadvantages of current
solution
Higher
Higheruser
userdata
datarates:
rates:
•• Use
Useof
ofdata
datacompression
compression((HSCSD,
HSCSD,GPRS)
GPRS)
••
••
Combining
Combiningof
oftraffic
trafficchannels
channels(HSCSD,
(HSCSD,GPRS)
GPRS)
New
Newchannel
channelcoding
coding(different
(differentfor
forHSCSD
HSCSDand
andGPRS)
GPRS)
Increased
Increasedradio
radioresource
resourceefficiency
efficiency--higher
higher
number
numberof
ofusers:
users:
••Shared
Sharedaccess
accessto
tothe
thesame
samechannel
channel(GPRS)
(GPRS)
GPRS offers a path towards UMTS
••
••
••
••
an
an evolution
evolution path
path to
to 3rd
3rd generation:
generation: UMTS
UMTS
aa means
means to
to evolve
evolve from
from aa predominantly
predominantly voice
voice to
to aa
mixed
mixed voice
voice and
and data
data world:
world: voice
voice isis also
also aa kind
kind
of
of data
data !!
aa means
means to
to exploit
exploit and
and enhance
enhance existing
existing networks
networks
aa solution
solution where
where existing
existing hardware
hardware need
need not
not be
be
replaced.
replaced. (Extremely
(Extremely cost
cost effective)
effective)
GPRS : Key architecture
GR integration
into HLR
Visited
Visited
MSC/VLR
MSC/VLR
BTS
BTS
HLR
HLR
GR
GR
Gateway
Gateway
MSC
MSC
PSTN
ISDN
BSC
BSC
Sie
me
ns
PCU
packet switched: GPRS
Mobile DTE
Serving
Serving
GSN
GSN
BTS extension
by SW
PCU Integration
into BSC
GSN - GPRS Support Node
Gateway
Gateway
GSN
GSN
SGSN & GGSN based
on a new platform
PCU - Packet Control Unit
GR - GPRS Register
Internet
Intranet
PSPDN
WRC-2000 IMT-2000 Frequencies
•
Questions