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

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

CHIH-MING HSIAO^1,2 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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