Research on Improvement Wireless Sensor Network S-MAC Protocol

Serious energy constraints exist in wireless sensor network.Traditional.S-MAC algorithm has the problems such as node conflict,the energy waste of sensor nodes caused by fixed load setting duty ratio and short network survival time.In order to save energy and prolong the network life time,a kind of efficient and energy-saving media access control(MAC) H-algorithm is put forward.H-MAC introduces the competition mechanism convergency trees and double scheduling to settle the conflicts between nodes of S-MAC algorithm,and by the dynamic allocation placeholder instead of the fixed duty of MAC–S,the network nodes can adapt to the dynamic changes of traffic load.Simulation is carried out with NS2.The results show that compared with S-MAC,the energy efficiency of the improved H-MAC algorithm is increased by 20%,and the conflict rate of between nodes is reduced,which extends the survival time of wireless sensor network.