According to recent research from the United States, "Disruption Tolerant Networks (DTNs) technologies are emerging solutions to networks that experience frequent partitions. As a result, multicast design in DTNs is a considerably more difficult problem compared to that in Internet and mobile ad hoc networks."
"In this paper, we first investigate three basic DTN multicast strategies, including unicast-based multicast (U-Multicast), static-tree-based multicast (ST-Multicast) and dynamic-tree-based multicast (DT-Multicast) strategies. Then we focus on studying two DT-Multicast routing schemes: Dynamic Tree Based Routing (DTBR) and On-demand Situation-aware Multicast (OS-Multicast), which address the challenges of utilizing opportunistic links to conduct dynamic multicast structures in DTNs. Performances of different strategies are then evaluated by simulations, including applying the real-world DTN traces. Our results show that OS-Multicast and DTBR can achieve higher message delivery ratio than that of using U-Multicast and ST-Multicast strategies," wrote Q. Ye and colleagues, Lehigh University.
The researchers concluded: "Also, to get better performance, we recommend that system designers select OS-Multicast when the source traffic rate is low. ."
Ye and colleagues published their study in Computer Communications (Performance comparison of different multicast routing strategies in disruption tolerant networks. Computer Communications, 2009;32(16 Sp. Iss):1731-1741).
For additional information, contact Q. Ye, Lehigh University, Dept. of Computational Science & Engineering, Bethlehem, PA 18015, USA.
Publisher contact information for the journal Computer Communications is: Elsevier Science BV, PO Box 211, 1000 AE Amsterdam, Netherlands.
Keywords: Computers, Lehigh University.
This article was prepared by Computer Weekly News editors from staff and other reports. Copyright 2009, Computer Weekly News via VerticalNews.com.
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