Lu Su, Bolin Ding, Yong Yang, Tarek F. Abdelzaher, Guohong Cao, and Jennifer C. Hou
In this paper, we describe oCast, an energy-optimal multicast routing protocol for wireless sensor networks. The general minimum-energy multicast problem is NP-hard. Intermittent connectivity that results from duty-cycling further complicates the problem. Nevertheless, we present both a centralized and distributed algorithm that are provably optimal when the number of destinations is small. This model is motivated by scenarios where sensors report to a small number of base stations or where data needs to be replicated on a small number of other nodes. We further propose an extended version of oCast, called delay bounded oCast (DB-oCast), which can discover optimal multicast trees under a predefined delay bound. Finally, we demonstrate the advantages of our schemes through both theoretical analysis and simulations.
|Published in||Proceedings of the 17th IEEE International Conference on Network Protocols (ICNP 2009)|
|Publisher||IEEE Computer Society|