【摘要】 针对认知无线电网络可用信道动态变化和网络中各认知节点可用信道不尽相同的特点,在应用组播技术的认知无线电网络中,以认知节点没有可用信道而退出组播组的情况为依据,提出以非可用信道数作为叶节点的权值,构造适用于认知无线电网络组播环境的密钥分发树。非可用信道数多的节点位于树的上部,非可用信道数少的节点位于树的下部。由证明可知,其具有最小的密钥存储量和平均密钥更新消息包数。更多还原

【Abstract】 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.更多还原