燕山大学学报2013，Vol.37Issue(1)：45-50,6.DOI:10.3969/j.issn.1007-791X.2013.01.008
一种基于轮询的认知无线网络频谱分配机制及性能分析
A polling based spectrum allocation mechanism in cognitive radio networks and performance evaluation
摘要
Abstract
In cognitive radio networks, to improve the spectrum utility, the cognitive users use the spectrum unoccupied by the primary users to transmit packets.In a centralized spectrum allocation scheme, a central scheduler coordinates and manages the spectrum allocation.The primary users have the preemptive priority on using the spectrum, so the packet transmission of the cognitive radio users may be interrupted.Considering the fairness of spectrum usage, a novel spectrum allocation mechanism based on pure limited polling strategy is proposed,and a discrete-time pure limited queueing system with multiple vacations and interrupted service is built.By applying the recycling method, the performance of the proposed spectrum allocation mechanism is analyzed, and the formulas for the performance measures, such as the average response time, the throughput, the spectrum switching ratio and the spectrum utilization are given.Numerical results with analysis and simulation are provided to demonstrate the dependency relationships between the system performance measures and the traffic load of the cognitive radio users.Moreover, the optimal design for the traffic load of the primary users is given.关键词
认知无线网络/频谱分配/抢占优先权/纯限量轮询策略/中断服务/性能指标Key words
cognitive radio networks/ spectrum allocation/ preemptive priority/ pure limited polling strategy/ interrupted service/performance measures分类
信息技术与安全科学引用本文复制引用
金顺福,徐德娜,赵媛..一种基于轮询的认知无线网络频谱分配机制及性能分析[J].燕山大学学报,2013,37(1):45-50,6.基金项目
河北省自然科学基金资助项目(F2012203093) （F2012203093）
