基于损失制轮询调度的频谱接入机制研究

Research on spectrum access mechanism based on loss polling scheduling

动态频谱接入技术在确保授权用户权利的同时,允许认知用户暂"借"空闲频谱,可有效解决频谱资源匮乏问题.针对认知无线电网络,只有一个信道但有多种数据需要发送的情况,提出基于损失制的多优先级轮询动态频谱接入机制.通过运用马尔可夫排队论理论,求解平衡状态下系统平均排队队长、平均排队时间等重要参数结果.数值分析和仿真实验结果表明,该机制提高了认知无线电网络系统的排队性能,可有效减少频谱空洞.

Abstract ： Dynamic spectrum access technology can ensure the rights of authorized users, while allowing cog- nitive users to temporarily borrow ＂idle＇spectrum,which can effectively solve the scarcity of spectrum resources. For cognitive radio networks with only one channel but many data needs to be transmitted, a muhipriority polling scheme based on loss mechanism is proposed.By applying the theory of Markov queuing theory, the average queue length and average queuing time of the system under equilibrium condition are obtained. Numerical analysis and simulation results show that the proposed mechanism can improve the queuing performance of cognitive radio networks and reduce the spectrum holes effectively.