自组网中树型拓扑的认知无线电路由协议

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

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.

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.