M/M/1/n-Based MAC Protocol in Wireless Sensor Networks with Adaptive Duty-Cycle

Abstract

Energy conservation is the primary goal for MAC protocol design in Wireless sensor networks. Based on the analysis of the existing low-duty-cycle S-MAC algorithms and the structural features of hierarchy WSN , an adaptive duty-cycle MAC protocol is proposed,which is integrated M/M/1/n queuing system. The new protocol can predict data throughput of next period based on the node’s queue model and then adjust the duty-cycle to achieve energy conservation. Analysis and simulation results show that, compare with S-MAC,the MAC protocol based on M/M/1/n saves about 48% energy, reduces latency by 21% and improves throughput by 33% in a cross topology network,which effectively prolongs the network lifetime.