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EE360: Lecture 14 Outline 3G Cellular and Beyond

EE360: Lecture 14 Outline 3G Cellular and Beyond. 1G and 2G What is 3G? Evolution to 3G 2.5G, 2.67589G? “Frequency reuse and coding for GPRS”, Matthias Unbehaun “Wireless mobile communications at the start of the 21 st century”, Jeremy Poole Beyond 3G.

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EE360: Lecture 14 Outline 3G Cellular and Beyond

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  1. EE360: Lecture 14 Outline3G Cellular and Beyond • 1G and 2G • What is 3G? • Evolution to 3G • 2.5G, 2.67589G? • “Frequency reuse and coding for GPRS”, Matthias Unbehaun • “Wireless mobile communications at the start of the 21st century”, Jeremy Poole • Beyond 3G

  2. 1-2 G Cellular Design: Voice Centric • Cellular coverage is designed for voice service • Area outage, e.g. < 10% or < 5%. • Minimal, but equal, service everywhere. • Cellular systems are designed for voice • 20 ms framing structure • Strong FEC, interleaving and decoding delays. • Spectral Efficiency • around 0.04-0.07 bps/Hz/sector • comparable for TDMA and CDMA

  3. 3G Cellular Design: Voice and Data • Goal (early 90s): A single worldwide air interface • Yeah, right • Bursty Data => Packet Transmission • Simultaneous with circuit voice transmisison • Need to “widen the data pipe”: • 384 Kbps outdoors, 1 Mbps indoors. • Need to provide QOS • Evolve from best effort to statistical or “guaranteed” • Adaptive Techniques • Rate (spreading, modulation/coding), power, resources, signature sequences, space-time processing, MIMO

  4. 3G GSM-Based Systems • EDGE: Packet data with adaptive modulation and coding • 8-PSK/GMSK at 271 ksps supports 9.02 to 59.2 kbps per time slot with up to 8 time-slots • Supports peak rates over 384 kbps • IP centric for both voice and data

  5. 3G CDMA ApproachesW-CDMA and cdma2000 • cdma2000 uses a multicarrier overlay for compatibility with IS-95 • WCDMA designed for evolution of GSM systems • Varying user bit rate is mapped to variable power and spreading • Different services can be mixed on a single code for a user • Multiple code operation CA CC CD

  6. TACS NMT/TACS/Other AMPS 1st Gen 2nd Gen PDC GSM TDMA CDMA 3rd Gen (EDGE in Europe and Asia outside Japan) EDGE cdma2000 W-CDMA/EDGE Global strategy based on W-CDMA and EDGE networks, common IP based network, and dual mode W-CDMA/EDGE phones. Cellular Standards Evolution Japan Americas Europe 1st Gen 2nd Gen 3rd Gen W-CDMA and cdma2000 will be optional modes in one spec. Basic phones will be one or the other. Global phones will have both. Converged TDMA/GSM family of technologies will have dominant market share (~80 percent).

  7. Cellular Systems Evolution • GSM (TDMA+FH): • GPRS • EDGE: Enhanced GPRS with adaptive modulation and coding • IS-95(CDMA): • Variable processing gain, e.g., WCDMA • HDR (Qualcomm) • Time slotted data with adaptive modulation • Data transmissions are scheduled • No spreading State-of-the art at the beginning of the 21st century

  8. Beyond 3G • Need to provide: “beyond data” • Higher data rates (at least on downlink) • More multimedia contents • Voice, data, video, WWW access. • broadcast as well as cellular • Wideband (10 MHz or more) • Main Candidates • WOFDM • WCDMA • Multicarrier CDMA • Other??? • How will these systems access the Internet and coexist with wireless LANs?

  9. Summary • Wireless data and multimedia are the main drivers for future generations of cellular systems. • Several competing standards (as in 2G). • Evolutionary path unclear. • Killer application unknown. • What do mobile users want? • How will cellular users access the Internet? • Will wireless LANs or cellular systems dominate the future wireless data landscape?

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