PAS: probability and sub-optimal distance-based lifetime prolonging strategy for underwater acoustic sensor networks

Lifetime prolonging is one of the most significant issues in the research on Underwater acoustic sensor networks (UASNs). Unbalanced energy consumption influences greatly the network lifetime. First this study discusses a probability-based energy balance (PEB) scheme. The sensor nodes report the data to the sink by single-hop direct transmission (DT) or by multi-hop transmission (MT) under the probabilities. A centralized probabilities finding algorithm (PFA) can find a set of transmission probabilities to better balance the energy consumption. Then, a sub- optimal distance (SOD)-based data transmission scheme is proposed which is a distributed scheme and operates on each sensor node. It optimizes the slice width and selects the relays near the optimum transmission range. Simulations show that the two schemes can save more energy and prolong the network lifetime efficiently. Copyright (c) 2008 John Wiley & Sons, Ltd.