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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*

CHIH-MING HSIAO1,2 AND GE-MING CHIU1
1Department of Computer Science and Information Engineering
National Taiwan University of Science and Technology
Taipei, 106 Taiwan
E-mail: chiu@mail.ntust.edu.tw
2Department of Computer Science and Information Engineering
St. John's University
Tamsui, 251 Taiwan
E-mail: cm@mail.sju.edu.tw

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.