An efficient routing scheme with optimal power control in wireless multi-hop sensor networks

Power consumption is a critical problem in providing multimedia communications among wireless sensor nodes (WSNs). To reduce power consumption and satisfying QoS requirements, in this paper, we propose an efficient routing scheme with optimal power management and on-demand quality control for WSNs. Two cost functions are developed to minimize the transmitting power and maximize the link quality under the constraint that an end-to-end frame error probability should be met. The heuristic problem of minimizing power consumption under frame error constraints is formulated and resolved with a closed-form expression. With this closed-form expression, we can determine an optimal route rapidly by calculating the power requirement for each sensor node. Finally, our analytical results indicate that the proposed scheme is superior to a previous work with the same constraint and is also comparable to the results obtained from a heuristic simulation. (C) 2007 Elsevier B.V. All rights reserved.