Mobile Computing and Databases –A Survey Daniel Barbar á. Pallavi Phene [email protected] November 12 th , 2002. “People and their machine should be able to access information and communicate with each other easily and securely, in any medium or combination of media—voice,
access information and communicate with
each other easily and securely, in any
medium or combination of media—voice,
data, image, video, or multimedia—any time,
anywhere, in a timely, cost-effective way”
Dr. George H. Heilmeier
IEEE Communication Mag.
Networks formed by Wireless, Mobile hosts without (necessarily) using a pre-existing infrastructure.
a) Routes between nodes may potentially contain multiple hops
b) Hidden Terminal Problem
c) Near Far Problem
Near-by terminals over power signals from far-away terminals
Base Stations (BS)
Mobile Host (MH)
“In mobile networking, computing activities are not disrupted when the user changes the computer's point of attachment to the Internet. Instead, all the needed reconnection occurs automatically and non-interactively.”
Charles E. PerkinsSun Microsystems
It is a push-based model for broadcasting data to the client rather than waiting for the client to request the specific data.
Dispersal and Reconstruction of Information using IDA
Dispersal and Reconstruction of Information using AIDA
“Consistency requires that data bound by a transaction be semantically preserved.”