认知无线电网络分布式多信道MAC协议  

Distributed multi-channel MAC protocol in cognitive radio networks

作　　者：冯文江[1] 陈倩[1] 李林[2] 沈嘉皓[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030 [2]重庆电子工程职业学院,重庆401331

出　　处：《计算机应用研究》2011年第2期639-641,共3页Application Research of Computers

基　　金：国家自然科学基金资助项目(60872038);国家"211"工程创新人才培养计划资助项目(S-09102);重庆市教委科技资助项目(KJ102201)

摘　　要：在认知无线电网络中,MAC协议用于信道感知、选择和接入控制。以单网卡多信道MAC(MMAC)协议为基础,依据IEEE 802.22标准定义的静默期管理的两阶段感知策略,提出一种认知无线电网络分布式多信道MAC(CR-MMAC)协议。将两阶段感知机制和分布式协商融入MMAC协议,利用空闲频谱进行数据传输,并在MMAC协议ATIM窗的数据信道协商阶段引入预约机制,以避免选择同一信道的认知节点对在后续数据传输阶段再利用CSMA/CA造成的竞争碰撞。仿真对比分析表明,CR-MMAC协议能提高网络吞吐量、降低通信时延,综合性能优于MMAC协议。The MAC protocols are used for channel sensing,selection and access in cognitive radio（CR） networks.This paper proposed a distributed multi-channel MAC（CR-MMAC） protocol in CR networks based on multi-channel MAC（MMAC） protocol,according to the two-phases sensing mechanisms defined by the IEEE 802.22 standard.The protocol took two-phases sensing mechanisms and distributed negotiation into account,used idle spectrum for communication and adopted reservation mechanism in the stage of channel negotiation of ATIM window of MMAC protocol,which avoided competition collision caused by the CR nodes choosing the same channel for data transmission stage using CSMA/CA.The simulation comparisons show that,CR-MMAC protocol improves network throughput,decreases communication delay,and the comprehensive performance is better than MMAC protocol.

关 键 词：认知无线电网络 MAC协议 多信道MAC协议 

分 类 号：TN915.04[电子电信—通信与信息系统]