认知无线ad hoc网的多尺度跨层路由协议

Multi-metric cross layer routing protocol for cognitive radio ad hoc networks

近年来,随着可用频谱资源的日益稀缺和无线业务量的剧增,认知无线自组网相关的研究得到广泛的关注,其中路由问题是应用中需要解决的重要问题之一.由于频谱机会具有动态性,认知无线网的路由问题要将功率控制、路径选择和信道分配联合起来,实现跨层优化设计.文中提出一种多尺度认知路由协议,根据用户的业务类型和服务质量需求进行尺度选择,并结合频谱机会为认知用户提供适用的解决方案.通过网络拓扑模型指出多径路由问题,并分别结合物理层、介质访问控制层和网络层的分析提出了多尺度优化模型.实验表明,该路由方法在端到端时延、吞吐量和数据投递率等参数上,都能够一定程度地改进服务质量.

With the aggravation of spectrum scarcity and the rapid increase of wireless service,the cognitive radio ad hoc network has become a hot research topic recently,and efficient routing protocol design is important in application.Owing to the dynamic feature of spectrum opportunity,the route protocol in the cognitive ad hoc network is complex and should be combined with power control and spectrum allocation."Phis paper proposes a multi-metric cognitive routing protocol M M-CAODV from the cross-layer prospect.They define routing metrics according to Quality of Service requirements,and provide multi-metrics solutions to secondary users considering spectrum opportunity.This paper points out the multi-path problem through the network topology model,analyzes different routing metrics of delay,transmit rate and stability,and then proposes the multi-metric optimization model.Simulation results show that the routing protocol in this paper has better network performance in three parameters:end-to-end delay,throughput,and packet delivery ratio.