摘要
面对当前频谱资源稀缺和多种异构无线接入技术并存的通信网络格局,认知无线网络技术的提出被认为是解决该问题的关键技术。媒体访问控制MAC协议决定了节点通过共享的无线信道发送和接收数据的方式,MAC协议能否合理地利用有限的无线信道资源对认知无线网络的性能起着决定性的影响。围绕如何设计高效的认知无线网络MAC协议,提出了CR-MMAC协议,CR-MMAC是一种基于专用控制信道的MAC协议,该协议是将MMAC协议进行了适当的改进,使之适合于认知无线网络环境,从网络假设条件、信道使用模型、协议帧结构、感知和接入信道的策略等方面详细阐述了该协议。仿真分析表明CR-MMAC协议具有较好的性能。
The cognitive radio network is proposed in the face of scarce spectrum resources and a variety of heterogeneous wireless access techniques.Media Access Control （MAC） protocol decides how the nodes in the networks receive and send data by shared wireless channels.Whether the MAC protocol can use the limited channel effectively or not plays a very important role in the performance of the cognitive radio network.Focusing on designing and implementing an excellent MAC protocol in cognitive radio networks,CR-MMAC is proposed,which is an improved MAC protocol based on MMAC.In CR-MMAC,there is a dedicated control channel.The network conditions,channel usage model,protocol frame structure and channel access strategy are presented.The simulation result shows that the proposed protocol has good performance.
出处
《计算机工程与科学》
CSCD
北大核心
2013年第12期66-75,共10页
Computer Engineering & Science
基金
湖北省教育厅资助项目(B2013032)
湖北经济学院青年基金资助项目(XJ201116
XJ201305)
国家级大学生创新创业训练计划资助项目(201211600011)
关键词
认知无线网络
MAC协议
频谱感知
信道接入
cognitive radio networks
media access control protocol
spectrum sense
channel access
