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Mobile Information Systems
Volume 2 (2006), Issue 1, Pages 3-19
http://dx.doi.org/10.1155/2006/930587

A Novel Data Replication and Management Protocol for Mobile Computing Systems

J. H. Abawajy,1 M. Mat Deris,2 and M. Omar3

1Deakin University, School of Information Technology, Geelong, VIC, 3217, Australia
2Tun Hussein Onn University of Technology, Faculty of Information Technology & Multimedia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia
3University of Malaya, Institute of Science Mathematics, 50603 Kuala Lumpur, Malaysia

Received 13 June 2006; Accepted 13 June 2006

Copyright © 2006 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mobile computing has enabled users to seamlessly access databases even when they are on the move. Mobile computing environments require data management approaches that are able to provide complete and highly available access to shared data at any time from any where. In this paper, we propose a novel replicated data protocol for achieving such goal. The proposed scheme replicates data synchronously over stationary sites based on three dimensional grid structure while objects in mobile sites are asynchronously replicated based on commonly visited sites for each user. This combination allows the proposed protocol to operate with less than full connectivity, to easily adapt to changes in group membership and not require all sites to agree to update data objects at any given time, thus giving the technique flexibility in mobile environments. The proposed replication technique is compared with a baseline replication technique and shown to exhibit high availability, fault tolerance and minimal access times of the data and services, which are very important in an environment with low-quality communication links.