Aiming at the time synchronization in distributed cognitive radio network (DCRN),a collaborative time synchronization scheme based on M&R model was proposed.First,the selected primary user (PU) broadcasts the free spectrum list to the neighbor nodes through control channel,to determine the available common channel between the node pairs.Then,the neighbor node takes this PU node as a reference node,and transmits the synchronization information on this common channel.At the same time,the M&S synchronization model is used to adjust the internal timer of nodes,to realize the clock synchronization.After several iterations,finally the entire network time synchronization is realized.Experimental results show that the proposed scheme can achieve the time synchronization for DCRN,and has faster convergence speed and lower cost.%针对分布式认知无线电网络(DCRN)中节点时间同步的问题,提出一种基于M&S同步模型的节点协作式时间同步机制.首先,选定的主用户(PU)通过控制信道将其空闲频谱列表广播到邻居节点,以确定节点对之间的可用公共信道;然后,邻居节点以该PU节点为参考,在公共信道上发送同步信息,并通过M&S同步模型调整内部计时器,从而实现时钟同步;经过多次迭代,最终实现全网时间同步.实验结果表明,该方案能够实现DCRN的时间同步,同时具有较快的收敛速度和较低的开销.
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