Abstract: Aiming at the problem that the wireless sensor network node sensing data existed spatial redundancy and time redundancy, the author proposed data compression algorithm—DADST algorithm of sensor network based on the dynamic adjustment of data transmission threshold. Firstly, the node collected the surrounding information and sent it to the base station, after receiving the data, the base station carried out Huffman encoding and immediately adjusted the encoded threshold for sending data to each node according to the data sent by the node. Then, each node judged whether to transmit compression code or original sensing data to the base station according to the received encoding. Simulation results show that the proposed algorithm can ensure precision of the data transmission, at the same time, it can significantly improve the amount of network data transmission and network work efficiency, and slow down the energy consumption of nodes.

Key words: dynamic adjustment, Huffman encoding, threshold, data compression