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Journal of Information Science and Engineering, Vol. 26 No. 2, pp. 673-684 (March 2010)

An Efficient Handoff Protocol for Causal Ordering Group Communication in Wireless Hybrid Networks*

1Department of Computer Science and Information Engineering
National Taiwan University of Science and Technology
Taipei, 106 Taiwan
2Department of Computer Science and Information Engineering
St. John's University
Tamsui, 251 Taiwan

Group communication has been an important communication paradigm for many distributed applications. However, the design of a group communication protocol is facing a new challenge with the emergence of mobile devices. The key to the efficiency of one such protocol is the provision of a handoff protocol that is able to seamlessly manage the mobility of devices in an efficient manner. In this paper, we address group communication that meets causal ordering requirement in a wireless hybrid network which is characterized by the multi-hop property of the underlying mobile ad hoc networks. In particular, we propose a handoff protocol to ensure smooth migration of mobile hosts while preserving causal ordering property at little cost in a wireless hybrid network.

Keywords: causal order, group communication, handoff, mobile computing, wireless hybrid network

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Received March 10, 2008; revised September 8 & November 6, 2008; accepted January 8, 2009.
Communicated by Yu-Chee Tseng.
* This work was partially supported by the iCAST project sponsored by the National Science Council, Taiwan, under the grant No. NSC 96-3114-P-001-002-Y. Ge-Ming Chiu was also supported in part by the National Science Council of Taiwan under grants NSC 94-2213-E-011-049 and NSC 95-2221-E-011-093-MY3. Chih-Ming Hsiao was supported in part by the National Science Council of Taiwan under grants NSC 97- 2221-E-129-008.