In 1997, the two hottest topics in information technology are the
Internet and mobile communications. Each one has the enthusiastic
attention of the consuming public, investors. and the technical
community. In a time of rapid expansion, they both face technical
obstacles to meeting the public's high expectations. This situation
stimulates a high volume of research in both areas. To bring the
Internet into the twenty-first century. the research community
focuses on multimedia communications in which integrated systems
store, transport. and process many types of information
simultaneously. A major challenge is to meet the of each
information service. This problem is separate performance
requirements especially challenging when a system has to deliver
broadband, real-time services such as full-motion video. Meanwhile.
the mobile communications research community continues its long
term struggle against the triple challenge of mobility. ether. and
energy. "Mobility" refers to the changing locations of terminals.
When terminals are mobile. networks have to determine their
locations and dynamically establish routes for information. The
networks also have to rearrange themselves in order to maintain
links to terminals with active communications sessions. "Ether"
refers to the problems of wireless communications including limited
bandwidth. rapidly changing radio propagation conditions. mutual
interference of radio signals. and vulnerability of systems to
eavesdropping and unauthorized access. "Energy" refers to the fact
that portable information devices carry their own power sources.
The rate at which the batteries of cellular telephones and portable
computers drain their energy has a strong effect on their utility."
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