Aiming at the problems in the carrier sense multiple access with collision avoidance (CSMA-CA) in IEEE 802.15.4 under the mass raw data transmission requirement in mechanical vibration wireless sensor networks(WSNs), such as the multiple carrier sense caused high listening energy consumption and hidden node caused high retransmission energy consumption, a transmission-sleep timing scheduling method was proposed based on the beacon synchronous trigger for machine vibration wireless sensor networks.The feature of whole network periodic synchronization in beacon-enabled networks was utilized to provide the basic time synchronization condition for distributed nodes, and to design a super frame structure, ensuring the time consistency of each node for receiving the scheduling information.Using the network short address at each node as the scheduling information and utilizing the ability of carrying payload of beacons to broadcast the scheduling information with beacons, the low consumption overhead scheduling information notification mechanism was realized.Finally, at each node the decision of whether transmitting data or sleeping was made according to the scheduling information to improve and optimize unnecessary high transmission energy consumption defects for the CSMA-CA during transmitting large amounts of raw data.Comparative experiments on the CSMA-CA were carried out and the experiment results indicate that the data transmission energy consumption of the machine vibration wireless sensor networks can be reduced effectively by the method.
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