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Présentation 4b


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Présentation 4b

  1. 1. CAT2000 GSM Evolution Towards UMTS IFT6275 Shouwen Zhang Fuman Jin
  2. 2. IMT- 2000 Goals <ul><li>Global system for wireless communications </li></ul><ul><li>Multi-environment operation </li></ul><ul><ul><li>Vehicular </li></ul></ul><ul><ul><li>Pedestrian and Outdoor-to-Indoor </li></ul></ul><ul><ul><li>Indoor Office </li></ul></ul><ul><ul><li>Satellite </li></ul></ul><ul><li>Support for packet data and circuit-switched services </li></ul><ul><li>Multimedia services support </li></ul><ul><li>Expected data rates: </li></ul><ul><ul><li>144 kbps in vehicular </li></ul></ul><ul><ul><li>384 kbps in pedestrian </li></ul></ul><ul><ul><li>2 Mbps in indoor office environment </li></ul></ul><ul><li>IMT- 2000 spectrum allocated at WARC 1992 </li></ul><ul><li>in the 2 GHz band </li></ul><ul><li>Year 2000+ services (subject to market considerations) </li></ul>
  3. 3. <ul><li>Low cost </li></ul><ul><li>Light weight </li></ul><ul><li>Low power drain / long talk time </li></ul><ul><li>Toll-quality voice </li></ul><ul><li>High security </li></ul><ul><li>Use multiple devices with the same User ID </li></ul><ul><ul><li>Services, routing and charging by personal ID/subscription </li></ul></ul><ul><li>International roaming </li></ul><ul><li>Broad range of services </li></ul><ul><ul><li>Fixed and mobile </li></ul></ul><ul><ul><li>Voice, data, multimedia </li></ul></ul>IMT-2000 End User Terminal Requirements
  4. 4. IMT- 2000 Key Architectural Requirements <ul><li>Broadband Radio Access </li></ul><ul><ul><li>Data Rates: 144, 384, 2000 kbps </li></ul></ul><ul><ul><li>Evolution from 2G (CDMA, TDMA, GSM, PHS, etc.) </li></ul></ul><ul><ul><li>Mobility vs. Fixed Wireless Access </li></ul></ul><ul><ul><li>Harmonized Spectrum Allocations </li></ul></ul><ul><li>Broadband Backbone Infrastructure </li></ul><ul><ul><li>Integrated Voice, Data, Image </li></ul></ul><ul><li>Network Architecture </li></ul><ul><ul><li>Functional Distribution </li></ul></ul><ul><ul><ul><li>WIN, GSM MAP, INAP </li></ul></ul></ul>
  5. 5. Third-Generation Systems Design Goals <ul><li>Meet IMT-2000 requirements </li></ul><ul><li>Offer additional capacity and service enhancements as an evolution of 2G systems (TDMA based GSM and IS-95 / ANSI-41 based CDMA) </li></ul><ul><li>Integrated voice and data system </li></ul><ul><ul><li>Optimized for voice and packet services </li></ul></ul><ul><ul><li>Support higher rate circuit services </li></ul></ul><ul><li>Smooth, backwards-compatible evolution from existing 2G systems </li></ul><ul><ul><li>Evolve network infrastructure and software from 2G systems </li></ul></ul><ul><ul><li>New dual-mode terminals allow gradual build-up of high data rate services in 2G service areas </li></ul></ul><ul><ul><li>Coexistence of 2G voice and data terminals with new wideband terminals </li></ul></ul>
  6. 6. Third-Generation Capabilities for Wideband Wireless multi-media <ul><li>Wide-band “bit pipe” between service providers and end-users </li></ul><ul><ul><li>up to 384 kb/s in wide areas </li></ul></ul><ul><ul><li>up to 2 Mb/s in limited areas </li></ul></ul><ul><li>IP connectivity from end-to-end </li></ul><ul><ul><li>Data ( and Voice) </li></ul></ul><ul><ul><li>Real-time and non real-time </li></ul></ul><ul><li>High bit-rate Services </li></ul><ul><ul><li>at least 384 kb/s wide area </li></ul></ul><ul><ul><li>up to 2 Mb/s in indoor environment </li></ul></ul><ul><li>Multimedia Applications </li></ul><ul><li>Optimized for Packet-data transfer/internet access </li></ul>
  7. 7. Migration Paths
  8. 8. GPRS <ul><li>GPRS </li></ul><ul><ul><li>Packet-based wireless communication service </li></ul></ul><ul><ul><li>New bearer service for GSM </li></ul></ul><ul><ul><li>evolutionary step toward Enhanced Data GSM Environment and Universal Mobile Telephone Service </li></ul></ul>
  9. 9. Benefits <ul><li>Higher data rates </li></ul><ul><ul><li>Using all 8 Packet Data Channels (PDCH) GPRS can achieve up to 171.2kbps (theoretical maximum) </li></ul></ul><ul><li>Packet switched principle </li></ul><ul><ul><li>efficient for burst traffic (e.g., Internet traffic) </li></ul></ul><ul><ul><li>radio channel only be allocated when needed </li></ul></ul><ul><ul><li>spectrum efficiency </li></ul></ul><ul><li>User-friendly billing </li></ul><ul><ul><li>payment based on the amount of transmitted data </li></ul></ul>
  10. 10. GPRS <ul><li>How to implement GPRS from GSM network: </li></ul><ul><li>8 Packet Data Channels (PDCH) </li></ul><ul><li>Gateway GPRS Support Node (GGSN) </li></ul><ul><li>Serving GPRS Support Node (SGSN)-- </li></ul><ul><li>GSM terminal change to have a GPRS protocol stack and application software </li></ul><ul><li>A Packet Control Unit (PCU) is added to each Base Station Subsystem (BSS) </li></ul><ul><ul><li>Radio link Contol </li></ul></ul><ul><ul><li>Media Access Control </li></ul></ul><ul><ul><li>Radio resource configuration and channel assignment </li></ul></ul>
  11. 11. GPRS System Architecture
  12. 12. SGSN <ul><li>Serving GPRS Support Node </li></ul><ul><ul><li>perform mobility management for GPRS mobile stations </li></ul></ul><ul><ul><li>manage the logical link to mobile stations </li></ul></ul><ul><ul><li>route and transfer packets between mobile stations and the GGSN (Gateway GPRS Support Node) </li></ul></ul><ul><ul><li>handle PDP(Packet Data Protocol (IP and X.25)) contexts </li></ul></ul><ul><ul><li>inter-work with the radio resource management in the BSS </li></ul></ul><ul><ul><li>authentication </li></ul></ul><ul><ul><li>charging (billing customers) </li></ul></ul>
  13. 13. GGSN <ul><li>Gateway GPRS Support Node </li></ul><ul><ul><li>function as a border gateway between the GPRS network and the packet data network (e.g., IP and X.25) </li></ul></ul><ul><ul><li>set up communications with the packet data network </li></ul></ul><ul><ul><li>route and tunnel packets to and from the SGSN </li></ul></ul><ul><ul><li>mobility management </li></ul></ul><ul><ul><li>authentication </li></ul></ul><ul><ul><li>charging </li></ul></ul>
  14. 14. Services <ul><li>Bearer services </li></ul><ul><ul><li>PTP(Point-To-Point) </li></ul></ul><ul><ul><ul><li>transfer data packets between two users </li></ul></ul></ul><ul><ul><ul><li>connectionless mode (e.g., for IP) </li></ul></ul></ul><ul><ul><ul><li>connection-oriented mode (e.g., for X.25) </li></ul></ul></ul><ul><ul><li>PTM(Point-To-Multi-point): not available yet </li></ul></ul><ul><ul><ul><li>transfer data packets from one user to multiple users </li></ul></ul></ul><ul><ul><ul><li>multicast service </li></ul></ul></ul><ul><ul><ul><li>group call service </li></ul></ul></ul><ul><li>Supplementary services </li></ul><ul><ul><li>call forwarding unconditional </li></ul></ul>
  15. 15. Routing GPRS Routing Example
  16. 16. Routing logical link tunnel Internet/PDN Packt IP datagram IP datagram MS SGSN GGSN Host GPRS Network IP Network
  17. 17. Logical Channels
  18. 18. Enhanced Data rates for GSM Evolution (EDGE) <ul><li>200 kHz carrier spacing </li></ul><ul><li>Reach up to 384kbps </li></ul><ul><li>8 TDMA time-slot </li></ul><ul><li>Modulation Format </li></ul><ul><ul><li>8-PSK as opposed to GMSK (in GPRS, HSCSD) </li></ul></ul><ul><ul><li>8-PSK:encodes 3 bits per modulated symbol GMSK: 1 bit per symbol </li></ul></ul><ul><li>Edge transceiver unit need to be added to each cell </li></ul><ul><li>Edge terminal--upgrade to use EDGE network functionality </li></ul>
  19. 19. EDGE System Architecture
  20. 21. UMTS <ul><li>384 kbps data capability to satisfy the IMT-2000 requirements for pedestrian(microcell) and low speed vehicular (macrocell) environments . </li></ul><ul><li>144 kbps data capability for high speed vehicular environment </li></ul><ul><li>2 Mbps requirement for indoor office is met by using wide band EDGE (1.6 MHz) carrier </li></ul>
  21. 22. Path Suggested
  22. 23. GSM Path to 3G <ul><li>HSCSD is not necessary. GPRS is already available. </li></ul><ul><li>GPRS is ten times faster than HSCSD. </li></ul><ul><li>GPRS expect to be able to offer higher data rates without building too </li></ul>many new sites. <ul><li>EDGE follows GPRS and allow a quick and cheap rollout of fast mobile service. </li></ul><ul><li>GSM->GPRS->EDGE->UMTS : </li></ul>smooth evolution cost-effective
  23. 24. Conclusion <ul><li>GPRS will be deployed cost-effectively in GSM first. </li></ul><ul><li>EDGE will follow GPRS to be deployed as a quick and cheap </li></ul>rollout of fast mobile service. <ul><li>UMTS will finally be deployed upon EDGE. </li></ul>