A low-latency cluster-MAC protocol for wireless sensor networks
Bo Li · Journal of Wuhan Institute of Technology · 2008
A wireless sensor network is composed of hundreds to thousands of sensor nodes that have the capability of sensing,processing and wireless communicating.In this paper,a contention-based Cluster-MAC protocol for wireless sensor networks is proposed.C-MAC divides WSN nodes into several clusters.In order to avoid interference between different clusters,adjacent cluster nodes consult that which cluster is activated at one time.In one cluster,we also delays the receiving and sending period hop by hop,so that when one node is in sending mode,its lower-hop node is in receiving mode.After receiving a message from upper-hop node,each node can transmit it to lower-hop node in sequent sending period.Therefore,the multi-hop end-to-end delay due to longer time to sleep is adopted to save more energy.The simulation result shows that C-MAC protocol achieves lower energy consumption and latency,and at the same time improves throughput than traditional contention-based protocols.