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. Several solutions for energy-ecien t broadcasting, mostly centralized, have been proposed with directional antennas. However, such globalized protocols are not suitable for ad hoc networks, because each node needs a full knowledge of the topology. Recently, a localized algo- rithm, called DRBOP, using one-to-one communication model has been proposed. It uses RNG graphs, which can be locally computed by each node. However, for energy consumption reasons, it can be useful to reach more than one neighbor at a time. In this paper, we propose an ecien t protocol which uses both one-to-one and one-to-many communication models. First, we present a variant of DRBOP ecien t for sparse net- works, based on LMST graph which is a local adaptation of minimal spanning tree. Then, a one-to-many protocol ecien t for dense networks is proposed. From these two algorithms we derive an adaptive protocol which is shown to be ecien t for both sparse and dense networks.

An Adaptive Localized Scheme for Energy-Efficient Broadcasting in Ad Hoc Networks with Directional Antennas