Présentation 4b

CAT2000

GSM Evolution Towards UMTS

IFT6275

Shouwen ZhangFuman Jin

GPRS: General Packet Radio Service

IMT- 2000 Goals

Global system for wireless communications Multi-environment operation

Vehicular Pedestrian and Outdoor-to-Indoor Indoor Office Satellite

Support for packet data and circuit-switched services Multimedia services support Expected data rates:

144 kbps in vehicular 384 kbps in pedestrian 2 Mbps in indoor office environment

IMT- 2000 spectrum allocated at WARC 1992

in the 2 GHz band Year 2000+ services (subject to market considerations)


Low cost

Light weight

Low power drain / long talk time

Toll-quality voice

High security

Use multiple devices with the same User ID

Services, routing and charging by personal ID/subscription

International roaming

Broad range of services

Fixed and mobile

Voice, data, multimedia

IMT-2000 End User Terminal Requirements


IMT- 2000 Key Architectural Requirements

Broadband Radio Access Data Rates: 144, 384, 2000 kbps

Evolution from 2G (CDMA, TDMA, GSM, PHS, etc.)

Mobility vs. Fixed Wireless Access

Harmonized Spectrum Allocations

Broadband Backbone Infrastructure Integrated Voice, Data, Image

Network Architecture Functional Distribution

WIN, GSM MAP, INAP


Third-Generation Systems Design Goals

Meet IMT-2000 requirements

Offer additional capacity and service enhancements as an evolution of

2G systems (TDMA based GSM and IS-95 / ANSI-41 based CDMA)

Integrated voice and data system

Optimized for voice and packet services

Support higher rate circuit services

Smooth, backwards-compatible evolution from existing 2G systems

Evolve network infrastructure and software from 2G systems

New dual-mode terminals allow gradual build-up of high data rate services in 2G

service areas

Coexistence of 2G voice and data terminals with new wideband terminals


Third-Generation Capabilities for Wideband Wireless multi-media

Wide-band “bit pipe” between service providers and end-users

up to 384 kb/s in wide areas

up to 2 Mb/s in limited areas

IP connectivity from end-to-end

Data ( and Voice)

Real-time and non real-time

High bit-rate Services

at least 384 kb/s wide area

up to 2 Mb/s in indoor environment

Multimedia Applications

Optimized for Packet-data transfer/internet access

Migration Paths


GPRS

GPRS Packet-based wireless communication

service New bearer service for GSM evolutionary step toward Enhanced Data

GSM Environment and Universal Mobile Telephone Service


Benefits

Higher data rates

Using all 8 Packet Data Channels (PDCH) GPRS can achieve

up to 171.2kbps (theoretical maximum)

Packet switched principle

efficient for burst traffic (e.g., Internet traffic)

radio channel only be allocated when needed

spectrum efficiency

User-friendly billing

payment based on the amount of transmitted data


GPRS

How to implement GPRS from GSM network:

8 Packet Data Channels (PDCH)Gateway GPRS Support Node (GGSN)Serving GPRS Support Node (SGSN)--

GSM terminal change to have a GPRS protocol stack and application softwareA Packet Control Unit (PCU) is added to each Base Station Subsystem (BSS)

Radio link ContolMedia Access ControlRadio resource configuration and channel assignment


GPRS System Architecture


SGSN

Serving GPRS Support Node

perform mobility management for GPRS mobile stations

manage the logical link to mobile stations

route and transfer packets between mobile stations and the

GGSN (Gateway GPRS Support Node)

handle PDP(Packet Data Protocol (IP and X.25)) contexts

inter-work with the radio resource management in the BSS

authentication

charging (billing customers)


GGSN

Gateway GPRS Support Node

function as a border gateway between the GPRS network and

the packet data network (e.g., IP and X.25)

set up communications with the packet data network

route and tunnel packets to and from the SGSN

mobility management

authentication

charging


Services

Bearer services PTP(Point-To-Point)

transfer data packets between two users

connectionless mode (e.g., for IP)

connection-oriented mode (e.g., for X.25)

PTM(Point-To-Multi-point): not available yet transfer data packets from one user to multiple users

multicast service

group call service

Supplementary services call forwarding unconditional


Routing

GPRS Routing Example


Routing

MS SGSN GGSN Hostlogical link

tunnelInternet/PDNPackt

IP datagramIP datagram

GPRS Network IP Network


Logical Channels

Group Channel Function Direction

Packet datatraffic channel

PDTCH Data traffic MS BSS

Packet broadcastcontrol channel

PBCCH Broadcast control MS BSS

Packet commoncontrol channel(PCCCH)

PRACHPAGCHPPCHPNCH

Random accessAccess grantPagingNotification

MS BSSMS BSSMS BSSMS BSS

Packet dedicatedcontrol channel

PACCHPTCCH

Associated controlTiming advancecontrol

MS BSSMS BSS

Enhanced Data rates for GSM Evolution (EDGE)

200 kHz carrier spacing Reach up to 384kbps 8 TDMA time-slot Modulation Format

8-PSK as opposed to GMSK (in GPRS, HSCSD) 8-PSK:encodes 3 bits per modulated symbol

GMSK: 1 bit per symbol Edge transceiver unit need to be added to each cell Edge terminal--upgrade to use EDGE network

functionality


EDGE System Architecture


UMTS

384 kbps data capability to satisfy the IMT-2000 requirements

for pedestrian(microcell) and low speed vehicular (macrocell)

environments .

144 kbps data capability for high speed vehicular environment

2 Mbps requirement for indoor office is met by using wide band

EDGE (1.6 MHz) carrier

Path Suggested

GSM Path to 3GHSCSD is not necessary. GPRS is already available.

GPRS is ten times faster than HSCSD.GPRS expect to be able to offer higher data rates without building too

many new sites.

EDGE follows GPRS and allow a quick and cheap rollout of fast mobile service.

GSM->GPRS->EDGE->UMTS:smooth evolutioncost-effective

Conclusion

GPRS will be deployed cost-effectively in GSM first.

EDGE will follow GPRS to be deployed as a quick and cheaprollout of fast mobile service.

UMTS will finally be deployed upon EDGE.

Business

Présentation 4b