Cellular Internet Connections

Cellular Internet Connections

Bo Kvarnström

Center for Radio Network Control, Linköping

Ericsson Radio Systems AB

Bo.Kvarnstrom@era.ericsson.se

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