| 认知频谱切换延时及用户容量的排队论分析 |
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| 引用本文： | 王玲, 彭启琮, 彭启航. 认知频谱切换延时及用户容量的排队论分析[J]. 电波科学学报, 2013, 28(6): 1023-1028. |
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| 作者姓名： | 王玲 彭启琮 彭启航 |
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| 作者单位： | 上海电力学院电子与信息工程学院,上海 200090 |
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| 摘 要： | 为了分析认知无线电系统中授权用户享有更高优先级对认知用户频谱切换造成的影响，提出了一种虚拟排队切换模型，对有强制中断率限制系统中的认知频谱切换延时进行了分析；并利用分段近似的方法给出了在切换超时概率较小环境下强制中断率和认知用户容量的解析表达. 仿真与数值计算验证了虚拟排队切换模型的有效性，同时也比较了不同授权用户行为对认知频谱切换延时及用户容量造成的影响。
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| 关 键 词： | 认知无线电 排队论 频谱切换 强制中断率 用户容量 |
Queuing analysis of spectrum handoff delay and user capacity in cognitive radio |
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| WANG Ling, PENG Qicong, PENG Qihang. Queuing analysis of spectrum handoff delay and user capacity in cognitive radio[J]. CHINESE JOURNAL OF RADIO SCIENCE, 2013, 28(6): 1023-1028. |
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| Authors: | WANG Ling PENG Qicong PENG Qihang |
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| Affiliation: | School of Electronic and Information Engineering, Shanghai Unviersity of Elecrtric Power, Shanghai 200090,China |
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| Abstract: | Primary users’ behavior with priority in cognitive radio system is investigated. Focusing. on handoff delay, a virtual queuing (VQ) model of spectrum handoff is proposed to analyze the effects of traffic characteristics of primary and secondary users. We derive a piecewise approximation of whole cognitive handoff process and obtain the analytical expression of force termination probability and user capacity. Analytical results and simulation confirm the virtual queuing model of spectrum handoff valid. Also delay violation probabilities affected by diverse primary users’ traffic parameters are compared. |
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| Keywords: | cognitive radio queuing theory spectrum handoff force termination probability user capacity |
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