CAT2000 GSM Evolution Towards UMTS

1. CAT2000GSM Evolution Towards UMTS IFT6275Shouwen ZhangFuman Jin

2. 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)

3. IMT-2000 End User Terminal Requirements • 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

4. 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

5. 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

6. 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

7. Migration Paths

8. GPRS • GPRS • Packet-based wireless communication service • New bearer service for GSM • evolutionary step toward Enhanced Data GSM Environment and Universal Mobile Telephone Service

9. 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

10. 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 software • A Packet Control Unit (PCU) is added to each Base Station Subsystem (BSS) • Radio link Contol • Media Access Control • Radio resource configuration and channel assignment

11. GPRS System Architecture

12. 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)

13. 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

14. 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

15. Routing GPRS Routing Example

16. GPRS Network IP Network SGSN MS GGSN Host Routing logical link tunnel Internet/PDN Packt IP datagram IP datagram

17. Logical Channels

18. 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

19. EDGE System Architecture

21. 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

22. Path Suggested

23. GSM Path to 3G • HSCSD 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 evolution cost-effective

24. Conclusion • GPRS will be deployed cost-effectively in GSM first. • EDGE will follow GPRS to be deployed as a quick and cheap rollout of fast mobile service. • UMTS will finally be deployed upon EDGE.