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In this paper, the authors present a novel tree propagation mechanism called "Extended Depth First Search" (EDFS) to efficiently do the flooding of broadcast messages in multi-hop wireless networks. Relying on a tree structure is a simple and efficient way to elect relay nodes and thus reduce the number of redundant re-transmissions. They discuss the principle and functioning of EDFS and propose both, a centralized and distributed algorithm to elect relay nodes in wireless environments. They also analyze the performance of the proposed technique and show that the distributed algorithm performs as well as the centralized. Finally, they present some simulation results to show the performance of EDFS compared to other flooding techniques.
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