基于信道分配矩阵的认知无线电网络容错频谱分配方案

摘要

For the issues that the existing spectrum allocation scheme of the cognitive radio (CR) network has not considered the problem of node failure, a spectrum allocation scheme based on channel assignment matrix with fault-tolerance function is proposed. First, the secondary user (SU) constructs a list of available channels through cooperative sensing and sends to the cluster head (CH). Then, the cluster heads construct the available channel matrix, and the channel allocation matrix (CAM) is formed by the channel assignment algorithm. When a node fails or is recovered, the channel assignment matrix is dynamically adjusted to complete channel allocation with minimal redistribution process. The experimental results show that the proposed scheme can well balance the network load and has a high spectrum utilization.%针对现有认知无线电(CR)网络中的频谱分配方案没有考虑到节点故障的问题,提出一种具有容错功能的基于信道分配矩阵的CR网络频谱分配方案.首先,二级用户(SU)通过协作感知构建可用信道列表并发送给簇头(CH).然后,簇头构建可用信道矩阵,并通过信道分配算法构建信道分配矩阵(CAM),完成信道分配.当节点出现故障或恢复时,动态调整信道分配矩阵,以最少的重分配过程完成信道分配.实验结果表明,该方案能够很好的均衡网络负载,且具有较高的频谱利用率.