دانلود Energy-Efficient Communication Protocol for Wireless Microsensor Networks

Abstract

Wireless distributed microsensor systems will enable the reliable monitoring of  a  variety  of  environments for  both civil and military  applications.   In  this paper,  we look at communication protocols,  which  can have significant impact  on  the  overall  energy  dissipation  of  these  networks. Based  on  our  findings  that  the  conventional protocols  of direct  transmission,  minimum-transmission-energy,  multi-hop routing, and static clustering may not be optimal for sensor networks, we propose LEACH (Low-Energy Adaptive Clustering Hierarchy), a clustering-based protocol that utilizes randomized rotation of local cluster base stations(cluster-heads) to evenly distribute the energy load among the sensors in the network.  LEACH uses localized coordination to enable scalability and robustness for dynamic net-works, and incorporates data fusion into the routing proto-col to reduce the amount of information that must be trans-mitted to the base station.  Simulations show that LEACH can achieve as much as a factor of 8 reduction in energy dissipation compared with conventional routing protocols. In addition, LEACH is able to distribute energy dissipation evenly throughout the sensors,  doubling the useful system lifetime for the networks we simulated.