Abstract:

In wireless sensor networks (WSN), all the data collected by sensors are forwarded to a sink node in a multi-hop way. The placement strategy of the sink node has a significant impact on the network lifetime. Firstly, the energy-oriented sink node placement strategy is introduced in randomly distributed WSN. Secondly, the lifetimeoriented sink node placement strategy is investigated. Finally, these two placement strategies are put in simulations in WSN with a routing-cost based ant routing algorithm. Simulation results show that the energy consumption of the networks with lifetime-oriented strategy is a little greater than that of the networks with energy-oriented strategy, but the lifetime of the former networks is prolonged effectively with a lower energy consumption.