Issue No.02 - February (2009 vol.8)
Kerem Bulbul , Sabanci University, Istanbul
Ozgur Ercetin , Sabanci University, Istanbul
Tonguç Ünlüyurt , Sabanci University, Istanbul
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TMC.2008.105
We consider source-initiated broadcast session traffic in an ad hoc wireless network operating under a hard constraint on the end-to-end delay between the source and any node in the network. We measure the delay to a given node in the number of hops data travels from the source to that node, and our objective in this paper is to construct an energy-efficient broadcast tree that has a maximum depth Δ, where Δ; represents the end-to-end hop constraint in the network. We characterize the optimal solution to a closely related problem in massively dense networks using a dynamic programming formulation. We prove that the optimal solution can be obtained by an algorithm of polynomial time complexity O(Δ²). The solution to the dynamic program indicates that there is a single optimal policy applicable to all massively dense networks. Elaborating on the insights provided by the structure of the problem in massively dense networks, we design an algorithm for finding a solution to the hop constrained minimum power broadcasting problem in general networks. By extensive simulations, we demonstrate that our proposed optimization-based algorithm generates broadcast trees within 20% of optimality for general dense networks.
energy efficiency, multicast, optimization
Kerem Bulbul, Ozgur Ercetin, Tonguç Ünlüyurt, "Hop Constrained Energy-Efficient Broadcasting: Insights from Massively Dense Ad Hoc Networks", IEEE Transactions on Mobile Computing, vol.8, no. 2, pp. 188-202, February 2009, doi:10.1109/TMC.2008.105