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Index Terms
- Mobile wireless computing: challenges in data management
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Reviews
Andrew S. Tanenbaum
The rapidly growing world of wireless communication and computing offers many new opportunities and challenges. In the future, people will be able to walk around with laptop, palmtop, and wristwatch computers that send, receive, and store information. Before this scenario becomes a reality, a few problems have to be solved. This paper gives a broad introduction to the problems and a few hints at where the solutions may lie. Current wireless systems can be roughly categorized into four groups, each with its own problems. Cellular telephones are primarily analog. Wireless (infrared) LANs have a short range. Wide-area data systems have too low a bandwidth. Satellite paging systems can only receive information. None of these will do for future interactive digital communication. New systems are needed. The authors point out four major challenges facing the designers of wireless systems. First is mobility management. In short, how does the system locate its wandering users__?__ Second is bandwidth management. In the world of wireless computing, 19.2 kbps is about all one can expect for the moment. Living with this bandwidth requires a heavy use of caching of potentially useful information when the wireless computer is plugged into the network, so most things the user will need will already be there when the user takes off. Third is energy management. It will no doubt come as a great shock to most computer scientists that battery lifetime is a major obstacle, and that researchers project only a 20 percent improvement in the next decade. This fact has serious implications for system design. For example, when wireless computers get their information by querying fixed servers, they must transmit, which uses a lot of energy. Alternatively, it may be better for the servers to frequently broadcast commonly requested in<__?__Pub Caret>formation, because listening takes less energy than transmitting. Of course, the scarcity of bandwidth argues the other way. The last word is not in yet. Finally, security and privacy are major issues, but most solutions are heavy consumers of scarce resources. All in all, this paper is an excellent introduction to the new world of wireless computing. It should interest a wide range of people in the computer industry.
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