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Frontiers of Engineering Reports on Leading-Edge Engineering from the 2001 NAE Symposium on Frontiers of Engineering (2002) / Chapter Skim
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Next-Generation Mobile Wireless Internet Technology
Pages 64-67

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From page 64...
... INTRODUCTION The potential for a mobile wireless data technology that offers cost effective, seamless connectivity to the Internet is virtually unlimited. One of the big drawbacks of conventional cellular wireless data technologies, such as thirdgeneration (3G)
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From page 65...
... Flash-OFDM, an air-interface technology designed specifically for packetdata, addresses most of the problems of conventional wireless data systems. Flash-OFDM offers reliable packet-data connectivity with very small delays, thereby supporting interactive data applications, such as voice, video, games, and more.
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From page 66...
... MAC AND LINK LAYERS In addition to the huge advantage of flash-OFDM at the physical layer, the most significant advantages of flash-OFDM for data transmission are at the MAC and link layers. Flash-OFDM exploits the granular nature of resources in OFDM 2Quadrature phase shift keying, quadrature amplitude modulation.
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From page 67...
... By contrast, TCP/IP performance on 3G networks is very inefficient because the link layer introduces significant delay jitter that TCP interprets as network congestion and, therefore, responds by backing off to the lowest rate. Packet switching leads to efficient statistical multiplexing of data users and enables wireless operators to support many more users for a given user experience.
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Key Terms

  • multiple access
  • wireless data
  • division multiple
  • link layer
  • base stations

  • technology designed
  • available spectrum
  • edge routers
  • conventional cellular
  • frame structure

  • access routers
  • data transmission
  • data traffic
  • significant delay
  • code division

  • bit pipe
  • network congestion
  • data applications
  • cellular wireless
  • network layers

  • packet switching
  • interactive data
  • control layers
  • delay jitter
  • conventional wireless

  • reliable link
  • typically consists
  • designed specifically
  • data technologies
  • design enabling


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