Huffman Key Distribution Trees Based on Cognitive Radio Network
IT Industry · 2010
Considering the characteristics that the dynamic spectrum and nodes have different channels available in cognitive radio network,if a cognitive node has no available channel,it has to quit the multicast group in the multicast environment.According to this phenomenon,this paper proposed a method to structure the key distribution tree that is suitable for cognitive radio network multicast environment,using the number of non-available channels as the weight of leaf nodes.The nodes with more non-available channels are in the higher part of the tree and the nodes with less non-available channels are in the lower part of the tree.It is proofed that the average cost of re-keying and the number of keys held by each user are minimal.