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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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Service Architectures for Emerging Wireless Networks
Pages 68-77

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From page 68...
... emerges, vendors and service providers are conducting technical and market trials. The challenge now is to design and deploy an infrastructure for services on an International scale that combines voice and data transmission, integrates multiple devices and networks, and provides a wide range of services for wireless users—enhanced messaging, location-aware services, tracking and notification services, etc.
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From page 69...
... Developing countries are adopting cell phones aggressively. China has more than 80 million subscribers; almost 40 percent of people in the Czech Republic subscribe to cell phones; and DoCoMo in Japan has 25 million subscribers to its data/information service called i-mode, which was launched in February 1999 (DoCoMo, 2001~.
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From page 70...
... Emerging wireless networks will have to handle a large number of devices, and, because customers are likely to own more than one wireless device (e.g., cell phones, PDAs, laptops, and other appliances with wireless modems, etc.) , 3G networks will have to handle many more customers than existing networks.
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From page 71...
... Then, I will provide an overview of other considerations for cellcos designing a services architecture. ENHANCED MESSAGING Current wireless systems provide simple, nonreal-time messaging services, such as voice mail and one- or two-way text messaging using SMS and paging; instant messaging is a popular real-time application.
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From page 72...
... The problems I have described above are mainly data management problems, and they are not difficult to solve, in principle, but they will require clean engineering solutions. For details on how to store duplicate, multimedia dataspace efficiently, how to perform on-demand content-type negotiation for transcoding, how to enable message sending by proxy to avoid redundant data transfers, and streaming (versus downloading)
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From page 73...
... To deliver these services, the wireless applications infrastructure will have to provide a mechanism for users to set their preferences for handling messaging events as logical rules, which will have to be maintained and applied by the service provider. LOCATION-AWARE SERVICES Mobility is a unique feature of wireless networks.
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From page 74...
... This works very well and suffices for most geopersonal information services (Muthukrishnan et al., 2001~. In a related note, E911 is a government-enforced program that localizes emergency callers; whatever infrastructure cellcos put in place must meet this demand, but only for in-progress cell phone calls and only for a small number of calls (statistics put the number of 911 calls per year nationwide at 50 million, while the number of cell phone calls per day is likely to be in the hundreds of millions [CTIA, 20011~.
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From page 75...
... In its simplest form, this consists of a proxy with which mobile clients communicate. Mobile clients pass their "location" information to the proxy, which not only translates it into geographic location, but also acts as a conduit to third-party information service providers by converting user requests to geocoded requests (e.g., by rewriting the URLs)
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From page 76...
... Finally, service providers are likely to develop novel applications, much as they have on the Web. Whatever services architecture is put into place, it will have to be capable of evolving, as necessary.
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From page 77...
... 2001. Location based services in a wireless WAN using cellular digital packet data (CDPD)
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Key Terms

  • wireless networks
  • service providers
  • services architecture
  • network elements
  • cell phones

  • emerging wireless
  • data users
  • status information
  • location information
  • information service

  • instant messaging
  • current mailer
  • mobile users
  • historical context
  • time difference

  • location tracking
  • information suited
  • data engineering
  • device status
  • multimedia messaging

  • digital packet
  • customers own
  • sms message
  • international workshop
  • presence information

  • mobile user
  • market trials
  • acm international
  • location registers
  • wireless means


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