Energy Conserving Routing in Wireless Ad-hoc Networks-英文文献.pdf

Energy Conserving Routing in Wireless Ad-hoc Networks Jae-Hwan Chang and Leandros Tassiulas Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland at College Park College Park, MD 20742 fjhchang,leandros g@isr.umd.edu Abstract— An ad-hoc network of wireless static nodes is considered as it arises in a rapidly deployed, sensor based, monitoring system. Informa- tion is generated in certain nodes and needs to reach a set of designated gateway nodes. Each node may adjust its power within a certain range that determines the set of possible one hop away neighbors. Traffic for- monitoring nodes warding through multiple hops is employed when the intended destination is not within immediate reach. The nodes have limited initial amounts of energy that is consumed in different rates depending on the power level gateways and the intended receiver. We propose algorithms to select the routes and the corresponding power levels such that the time until the batteries of the nodes drain-out is maximized. The algorithms are local and amenable to distributed implementation. When there is a single power level, the prob- lem is reduced to a maximum flow problem with node capacities and the al- gorithms converge to the optimal solution. When there are multiple power levels then the achievable lifetime is close to the optimal (that is computed by linear programming) most of the time. It turns out that in order to maximize the lifetime, the traffic should be routed such that the energy consumption is balanced among the nodes in proportion to their energy