基于认知无线电的MANET网络中虚拟骨干网的建立

The Formation of Virtual Backbone Network in MANETs Based on Cognitive Radio

将认知无线电技术融入MANET网络,利用认知节点的频谱感知功能,实施基于动态信息的簇首和网关选择.以簇首为锚点,通过选择受主用户影响较小的网关节点寻求连通支配集,建立虚拟骨干网.由此生成的虚拟骨干网以簇首为接入点,簇首间的网关承担簇间连接功能.基于权值比较,通过对主用户的位置感知,划分认知节点的空间分布区域并赋以不同的权值设计,实现对网络的分区处理,一方面维持运动中的分簇相对稳定,另一方面减少干扰链路存在的概率.最后通过仿真分析进行了算法的有效性验证.

Selections of cluster-heads and gateways can be made on the basis of dynamic information by integrating cognitive radio technologies with MANET network and adopting the spectrum sensing function of cognitive nodes.A virtual backbone network is established with the cluster-head as the anchor point by choosing gateway nodes that are less affected by primary user in quest of connected dominating set.Thus,the generated virtual backbone network takes cluster-head as the access point,with the gateway between adjacent clusters being responsible for the inter-cluster connectivity.Based on the comparison of weights,through the sensing of the location of the primary user,the spatial distribution areas of the cognitive nodes are divided and assigned different weights,thus realizing partition processing in the network.On one hand,this maintains a relative stability of the sub-clusters in motion;on the other hand,it reduces the probability of interference links.In the end,the validity of the algorithm is verified by a simulation analysis.