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438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
438lecture9
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438lecture9
438lecture9
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438lecture9

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  • 1. GSM Evolution
  • 2. GSM Evolution OverviewHigh Speed Circuit Switched Data GPRS for GSM EDGE Evolution to UMTS
  • 3. GSM Evolution Overview
  • 4. GSM Evolution Functionality UMTS GSM++ ~2 Mbps EDGE 384 GSM+ kbps GPRS 124-171 kbps HSCSD < 57.6 kbps GSM IN GSM: Global System for Mobile Telecommunications CSD EDGE: Enhanced Data Rate for GSM Evolution < 14.4 kbps SMS: Short Message Service CSD: Circuit Switched Data IN: Intelligent Network SMS HSCSD: High Speed CSD GPRS: General Packet Radio Service UMTS: Universal Mobile Telecommunications Service Speech 1992 2002 Time
  • 5. Service Opportunities vs. Channel Data Rate 1992-1999 2000 - 2002 Broadband GSM GPRS UMTS WLANs 1. Circuit switched 2. Packet data and wireless 3. Expanded services multimedia Opportunities multimedia services services Service • HSCSD: 57.6 kbps • GPRS: 170 kbps • WLANs: 2 to 11 Mbps • UMTS: 2 Mbps indoor Narrowband Wideband Broadband (9.6 to 64 kbps) (64 kbps to 2 Mbps) (> 2 Mbps ) Channel Data Rate
  • 6. Data Capabilities in GSM (to 3G) GPRS: General Packet Radio Service 1M EDGE: Enhanced Data Rate for GSM Evolution Bits per Second UTRA: UMTS Terrestrial Radio Access UTRA (W-CDMA) 100 k EDGE GPRS 10 k GSM (CSD) Number of Data Users
  • 7. High Speed Circuit Switched Data (HSCSD)
  • 8. High Speed Circuit SwitchedData (HSCSD) in GSM • Enables co-allocation of multiple full rate traffic channels into a HSCSD configuration • Provides new speed of 14.4 kbps per time slot due to a nominal reduction in error-correction overhead of RLP • Needs relatively standard upgrades to base station and mobile switching center RLP: Radio Link Protocol
  • 9. General Packet Radio Service (GPRS) for GSM
  • 10. General Packet Radio Service (GPRS)Capabilities • Enhances GSM data services significantly by providing end-to-end packet switched data connection • Offers data services up to 115 kbps using TCP/IP and X.25 • Provides a platform on which to build IMT-2000 frequencies • Allows to connect with any data source from any where in the world TCP/IP: Transmission Control Protocol/Internet Protocol
  • 11. What Does GPRS Provide?• A service for busty and bulky data transfer• Use of radio resources only on demand• Shared use of physical radio resources• Use of existing GSM functionality (as far as possible)• Satisfy needs for most applications• Mobile stations for mass application market• Volume dependent charging• Integrated services, operation and management• Reduced connection set-up times• Support existing packet-oriented protocols such as X.25 and IP• Point-to-point and point-to-multipoint services
  • 12. GPRS Point-to-point Services • Messaging (e.g., e-mail) • Remote access to corporate networks • Access to Internet • Credit cards validation (point of sales) • Utility meter readings • Road toll applications • Automatic Train Control (ATC)
  • 13. GPRS Point-to-multipoint (PTM) Services • PTM-multicast (send to all) • News • Traffic information • Weather forecasts • Financial updates • PTM-group call (send to some) • Taxi, fleet management • Conferencing
  • 14. GPRS Data Capabilities• The user can access packet data network based on – X.25 – IP (with dynamic or static allocation)• Multiple data sessions in operation at one time
  • 15. GPRS/ GSM Network Architecture SGSN: Serving GPRS Support Node GGSN: Gateway GPRS Support Node Network Reference Model MAP: Mobile Application Part HLR: Home Location Register VLR: Visitor Location Register MSC: Mobile Switching Center BSS: Base Station System SMS-GMSC GMSC: Gateway MSC SMS-IWMSC SM-SC IWMSC: Interworking MSC TE: Terminal Equipment MT: Mobile Terminal MAP-H MAP-C EIR: Equipment Identity Register Gd MSC/VLR HLR MAP-D Gr A Gc GS Gi TE MT BSS SGSN GGSN PDN TE R Um Gb Gn Gp GGSN EIR Signaling + Information Other PLMN Signaling MAP-F
  • 16. Enhanced Data for GSM Evolution (EDGE)
  • 17. EDGE • An evolution of GSM technology for higher data rates • Greater than 69 kbps per time slot at air interface • Faster GPRS (EGPRS) • Higher speed circuit-switched data • Hardware/software modifications needed
  • 18. EDGE Capabilities 384 kbps data capability to satisfy the IMT-2000 specifications 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 May be combined with GPRS and HSCSD to create: – EGPRS with collective gross data rate of 65.2 kbps – ECSD (with channel coding to improve BER) with 38.4 kbps/timeslot; time slots may be aggregated ECSD: Enhanced Circuit switched Data EGPRS: Enhanced General Packet Radio Service GPRS: General Packet Radio Service HSCSD: High Speed CSD
  • 19. EDGE Phase 1 • 200 kHz carrier spacing • 8 TDMA time-slots • Modulation Formats  Quaternary-offset-QAM (~16-QAM)  Binary-offset-QAM (~QPSK)  GMSK • Set of convolutional codes for channel coding to improve BER
  • 20. EDGE Adaptations EDGE Classic EDGE Compact Deployment GSM Networks For IS-36 Networks Reuse 4 cell / 12 sector 1 cell / 3 sector Spectrum 2.4 MHz 1 MHz Max Bundled TS 8 4
  • 21. EDGE Phase 2 • EDGE Phase 2 can have greater than 2 Mbps by using new modulation format - Double-EDGE • Characteristics:  2.6 M-symbols/s  0.384 s symbol duration; Typical Indoor TS=0.4 s  B/Q-O-QAM —> 8-PSK  1.6 MHz Channels, FDD and TTD  Max 4.7 Mbps • EDGE Is a 3G System not simply a 2+ feature! EDGE potentially offers 3G services at 2G price!
  • 22. GPRS & EDGE Role in Mobile DataServices Data Rates RemarksCSD: Circuit Switched Data in GSM 9.6 kbps/TS (14.4 kbps Data uses a voice channel defined but not yet offered)SMS: Short Message Service 0.001 to 0.1 kbps Data travels only on CCH (160 Bytes/message)CDPD: Cellular Digital Packet Data, 13.2 kbps (UL) Data uses idle voice channels.Offered in D-AMPS 12.1 kbps (DL) Voice has priority. No bundling of channelsHSCSD: High Speed CSD Concatenation of up to 8 TSs Multislot operation of CSD i.e., 76.8 kbpsGPRS: General Packet Radio 9.05 kbps with CS-1 up to New packet random access.Service, 4 different Coding 21.4 kbps per TS with CS-4 Slotted ALOHA reservation.Schemes defined 171.2 kbps for 8-slot mobiles Packet Switched System with GMSK ModulationEGPRS: Enhanced GPRS 8.8 kbps with MCS-1 up to EDGE Concept uses GMSK andusing EDGE concept with 9 59.2 kbps with MCS-9 per TS 8-PSK. Smooth transition fromcoding schemes MCS-1 , …, MCS-9 473.6 kbps for 8 slot mobiles GPRS. Link adaptation Incremental. RedundancyEDGE Compact: ETSI EDGE for IS-136HS Theoretically like EGPRS, but Uses 1 MHz of spectrum, i.e., 1/3 reuse(North American TDMA) will definitely be lower due to must be applied. CCHs need to be Tighter reuse synchronized BSS networkUMTS: Universal Mobile Telecommunication 2 Mbps CDMA with TDD and FDD modes. 2 MbpsSystem for in-house and pico-cells. 384 kbps for. Outdoor or Macro-cellsBRAN: Broadband radio Access Network 25 Mbps.. 155 Mbps OFDM: HIPERLAN 25 Mpbps, HIPER- ACCESS 25 Mbps, HIPERLINK 155 Mbps
  • 23. Evolution to Universal MobileTelecommunications Systems (UMTS)
  • 24. Future of GSM Access to PSTN Internet Access to people ISDN+ Internet+ information & (voice and people data) (multimedia) ISUP + TCP / IP GSM / UMTS Core Network A lu GSM Radio UMTS Terrestrial Radio Access Network Access Network (UTRAN) Narrowband to Wideband to Wideband Broadband64/115 kb/s wide area GSM GSM / IMT-2000 384 kb/s wide area 384 kb/s local area IMT-2000 2 Mb/s local area Access to people and information
  • 25. UMTS Terrestrial Radio Access Network(UTRAN) UMTS Core Network HLR To PSDN or GGSN SGSN MSC To PSTN Internet Iup Iuc Serving Radio Network Sybsystem (RNS) Iur RNC RNC UMTS Terrestrial Radio Access Iub Iub Network Node B cell Node B Node B (UTRAN) cell cell cell cell Node B cell cell cell cell cell cell cell Drift RNS UMTS Air Interface Uu UE

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