Middleware 2003

ACM/IFIP/USENIX International Middleware Conference

Rio Othon Palace Hotel

Rio de Janeiro, Brazil

16-20 June 2003

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Full Paper Abstracts

A Middleware Service for Mobile Ad Hoc Data Sharing, Enhancing Data Availability

Malika Boulkenafed and Valerie Issarny (INRIA)

It is now commonplace for a person to use lightweight wireless computing devices, and to make
his/her data available to other people's devices using todays various networking capabilities
(infrastructure-based WLAN, ad-hoc WLAN, GSM, etc.). Middleware platforms initially developed
for stationary distributed systems cannot be directly applied in such a mobile environment. They
must adapt their functionalities so as to best cope with possible resource constraints (energy,
storage) of mobile terminals as well as with the various types of wireless networks that are now
available. In this paper, we present a middleware service that allows collaborative data sharing
among ad~hoc groups that are dynamically formed according to the connectivity achieved by the
ad~hoc WLAN. Our service enhances, in particular, data availability within mobile ad-hoc
collaborative groups, and integrates a new adaptive data replication protocol for mobile terminals, 
combining both optimistic and conservative schemes. Our service has been designed so as to
minimize energy consumption and optimize data availability and storage consumption.

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