Dynamic multichannel MAC protocol for wireless sensor networks
Asic System · 2014
In order to alleviate the debasement of quality of service( QoS) caused by interference between transmissions from nodes in wireless sensor network and interference from Wi Fi devices outside the network,a dynamic multichannel media access control( DM-M AC) protocol is proposed.First,three-way handshake scheme and distributed computing are used to allot initial channel for nodes in the network. Secondly,each node chooses a channel hopping sequence from a rectangular Latin array according to its initial channel. On this basis,channel positions among the sequence are adjusted using state transition diagram. When the number of used channels changes,the newLatin channel hopping sequence should be reconstructed according to channel state transition diagram. Finally,the performance of DM-MAC is evaluated through NS2 simulations. The results showthat compared to Mu CHM AC protocol,DM-M AC can reduce internal interference between sensor nodes efficiently,as well as external interference from WiFi devices. Meanwhile,the proposed M AC protocol improves average end-to-end delivery latency and delay bound,and increases the quality of service.