自组网中树型拓扑的认知无线电路由协议

为了解决认知无线电网络中频谱分配和路由选择相协调的问题,提出了树型拓扑的认知无线电路由协议.在分布式自组织网络中,非授权(次要)用户选择最优的空闲授权信道建立频谱树,同时在树的形成过程中,以多棵用户节点较少的频谱树代替一棵用户节点较多的频谱树,有效降低了每棵树的根节点负载.根据频谱树和基于最小时延的路由度量标准,建立了路由以完成次要用户间的通信.仿真结果表明,该协议能有效减少端到端的平均时延.

A Tree-Based Cognitive Radio Routing Protocol in Ad Hoc Networks

To solve the problem of collaboration between the route selection and spectrum decision in cognitive radio networks,a new routing protocol,based on the spectrum-tree,is proposed for cognitive radio networks.In Ad hoc networks,the unlicensed(secondary) users establish a "spectrum-tree" in the optimal unused channel.To decrease the loading of root in each tree,a single tree with more secondary users is replaced by some trees with a few users.By using the spectrum-tree and a route metric based on end-to-end delay,the route can be established for the secondary users.Simulations show that our proposed routing protocol shortens the average end-to-end delay efficiently.