cellular internet connections bo kvarnström center for radio network control, linköping ericsson...
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Cellular Internet Connections
Cellular Internet Connections
Bo Kvarnström
Center for Radio Network Control, Linköping
Ericsson Radio Systems AB
Cellular Telephony emulates the services provided by
fixed Telephony
Cellular NetworkService
Access Point
1995 1996 1997 1998 1999 2000 2001 2002 2003
100
200
300
500
400
GSM 900
GSM 1800
GSM 1900
GSM Market Growth
Cellular Networksemulates the services provided by
fixed Networks
Cellular Network
Service Network
Access Network
Cellular Service Network
• Subscriber Management– Customer Care– Billing
• Interface Mediation
• Mobility Management– Roaming
Access NetworkAccess Network
Circuit SwitchedServices
Circuit SwitchedServices
PSTN/ISDN
Internet
Circuit SwitchedServices
Circuit SwitchedServices
Packet SwitchedServices
Packet SwitchedServices
PSTN/ISDN Internet
TodayToday TomorrowTomorrow
Cellular Access NetworkService Network
Access Point
Radio Blocks
Service NetworkAccess Point
IP packets
.
MAC/RLC
Radio Blocks
Radio Blocks
ACK/NACK(MAC/RLC)
MS
LLC
LLC PDU
ACK/NACK
IP packets
fu
fd
One duplex user channelup to 14.4 kbit/s user data
14.4kbps
14.4kbps
14.4kbps
14.4kbps
14.4kbps
14.4kbps
14.4kbps
14.4kbps
N x 14.4 kbpsN x 14.4 kbps
Allocate more slots per user
New modulation schemes
14.4 - 48.8 kbps per slot14.4 - 48.8 kbps per slot
Indoor Local Wide areaIndoor Local Wide area
W-LAN
DECT
Cellular evolution
Cellular
bits/s
10 K
64 K
384 K
2 M
OriginalGSM
(8 x) 9,6 kbps77
GSMToday
(8 x) 14,4 kbps115
Future GSM
(8 x) 48,8 kbps384
GSM Summary
• Transition from Circuit towards Packet ongoing
• Step by step introduction of higher bit rates
WCDMAWideband Code Division Multiple Access
Optimized for variable and high speed data rates
Higher capacity and coverage
Designed for both packet and circuit switched services
Supports multiple simultaneous services
Circuit SwitchedServices
Packet SwitchedServices
PSTN/ISDN Internet
GSM Access NetworkGSM Access Network
WCDMA Access NetworkWCDMA Access Network
• High data rates in 5 MHz– 384 kbps with wide-area coverage– 2 Mbps with local coverage
• High service flexibility – support for services with variable rate– support for simultaneous services– support of multiple parallel variable-rate
services on one connection– packet and circuit switched services
• Fast and efficient packet access
• Higher capacity
Indoor Local Wide areaIndoor Local Wide area
W-LAN
DECTUMTS
Cellular evolution
Cellular
bits/s
10 K
64 K
384 K
2 M
Coverage vs Bandwidth