非时隙结构认知无线网络中非授权用户传输时延分析  

Packet transmission delay of secondary users in unsloted cognitive radio network

作　　者：方泓茜 刘娇[1] 朱东弼[1] 

机构地区：[1]延边大学工学院电子信息工程系,吉林延吉133002

出　　处：《延边大学学报（自然科学版）》2014年第2期154-157,共4页Journal of Yanbian University（Natural Science Edition）

摘　　要：在非时隙结构认知无线网络中,以随机侦听多址方案为基础构建了系统的数学模型,利用柯尔莫哥洛夫费勒前向方程得出系统的稳态概率,并采用拉普拉斯斯帝尔阶斯变换推导出非授权用户数据包的平均传输时延.数值分析表明,信道忙的概率和平均退避时间与传输时延呈正比关系,不同的载波侦听多址方案对传输时延影响很大,其中全侦听多址方案的传输时延最小.We construct the mathematical model of CSMA scheme with random-sensing in unsloted cognitive radio network,then by the Kolmogorov forward equation we obtained the stationary probability of the system.At last,we estimated the packet transmission delay of secondary users by Laplace-Stieltjes transform.The numerical result shows that packet transmission delay increases as the channel busy probability or back-off time increases.Different CSMA schemes also have influence on packet transmission delay,and it will be shortest when we use CSMA scheme with all-sensing.

关 键 词：认知无线网络 随机侦听多址方案 传输时延 拉普拉斯斯帝尔阶斯变换 

分 类 号：TN915[电子电信—通信与信息系统]