Recognition method of key nodes in SN-UASN based on TOPSIS

In Underwater Acoustic Sensor Networks (UASN), certain key nodes in the network will cause network partition, communication failure, packet loss once they failed to work. Also, because the key nodes are key positions of the UASN, once the malicious behavior of the key nodes occurs, the network performance will drop sharply. This paper first puts forward the key node recognition method for UASN. Also, we propose node usage and hop distance factors to evaluate node's importance. Five factors at the topological level are combined, and using Technique for Order Performance by Similarity to Ideal Solution (TOPSIS) method to evaluate the importance of each node in the UASN. In the experiment, the key nodes are replaced by attack nodes to verify the performance of the algorithm. Experiment results show that the algorithm has a good and effective value.