认知无线电传感器网络CSMA协议中主用户和次用户的性能分析  

Performance evaluation of primary user and secondary user based on CSMA protocol in CRSN

作　　者：刘莹[1] 郑黎[1] 黎远松[2] 

机构地区：[1]四川工程职业技术学院电气信息工程系,四川德阳618000 [2]四川理工学院计算机学院,四川自贡643000

出　　处：《电信科学》2016年第4期36-43,共8页Telecommunications Science

基　　金：四川省高校重点实验室基金资助项目(No.2014WZY05);四川省智慧旅游研究基地规划基金资助项目(No.ZHY15-01)~~

摘　　要：针对认知无线电传感器网络(CRSN)中物理层特性高度可变带来的性能不确定性,在CRSN中定义了两种基础性能指标(带宽和时延),并分析了基于载波侦听多路访问(CSMA)的介质访问控制协议的性能。首先,在给定的主用户(PU)业务模型下利用CSMA算法估计单个次级用户(SU)的潜在带宽;然后,推导在不同业务信道同时传输多个SU的聚合带宽;最后,利用优先级队列模型M/G/C估计介质访问中的时延。性能分析表明,通过使用分布式信道协作结合CSMA的并发传输,聚合带宽可增加5倍,利用不同业务信道同时传输明显降低了分组时延。For the problem of uncertainty owing to the highly variable physical layer characteristics in cognitive radio sensor networks（CRSN）, two fundamental performance metrics（bandwidth and delay） were formulated and the performance of medium access control protocol based on CSMA was analyzed. Firstly, CSMA algorithm was used to estimate potential bandwidth of secondary user under the given PU traffic model. Then, aggregated bandwidth of multiple SU simultaneous transmitting within different business channels was derived. Finally, the priority queue model M/G/C was used to analyze the delay of MAC. Performance analysis shows that dedicating a common control channel for SU enhances their aggregated bandwidth approximately five times and the packet delay reduces significantly through the possibility of concurrent transmissions on different traffic channels.

关 键 词：认知无线电 传感器网络 带宽估计 时延估计 主用户 次用户 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]