摘要
针对非实时业务的特点,该文提出了机会频谱接入系统的两种切换请求排队方案,并采用二维Markov模型对其性能进行了建模分析,得到了呼叫阻塞率、强制中断率、信道利用率等系统性能关键参数的解析结果。数值结果分析表明,提出的两种切换请求排队方案是降低系统强制中断率的有效方法,且可克服切换信道预留机制阻塞率高、信道利用率低的缺点,信道利用率最多可提高26%。仿真实验验证了理论分析的正确性。
Two handoff queuing schemes of Opportunistic Spectrum Access （OSA） system are proposed for non-real-time services. For each scheme, a two-dimensional Markov chain analysis is presented and the blocking probability, force termination probability and bandwidth utilization are obtained. Numerical results show that the handoff queuing schemes can greatly reduce forced termination probability and the bandwidth utilization can be improved by 26% compared to the handoff channel reservation scheme with high blocking probability and low bandwidth utilization. The simulation results are observed to match closely with the numerical analysis.
出处
《电子与信息学报》
EI
CSCD
北大核心
2009年第6期1505-1508,共4页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60772110)资助课题
关键词
认知无线电
机会频谱接入
切换请求排队
MARKOV模型
强制中断率
Cognitive Radio （CR）
Opportunistic Spectrum Access （OSA）
Handoff queuing
Markov model
Force termination probability
