| 金顺福,代羽,徐秀丽.基于超时隙的集中式认知无线网络频谱分配策略及性能分析[J].高技术通讯(中文),2013,23(9):883~887 |
| 基于超时隙的集中式认知无线网络频谱分配策略及性能分析 |
| A centralized spectrum allocation strategy based on super slots for cognitive radio networks and its performance analysis |
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| DOI： |
| 中文关键词: 认知无线网络,频谱分配,集中控制,超时隙,Markov链模型 |
| 英文关键词: cognitive radio network,spectrum allocation,centralized control,super slot,Markov model |
| 基金项目: |
| 作者 | 单位 | | 金顺福 | 燕山大学信息科学与工程学院秦皇岛；河北省计算机虚拟技术与系统集成重点实验室秦皇岛 | | 代羽 | 燕山大学信息科学与工程学院秦皇岛；河北省计算机虚拟技术与系统集成重点实验室秦皇岛 | | 徐秀丽 | 燕山大学理学院秦皇岛 |
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| 中文摘要: |
| 令授权用户在超时隙边界处抢占频谱，认知用户基于时隙传输数据，提出了一种基于超时隙的集中式频谱分配策略。结合当前时隙在超时隙中的编号及系统中认知用户数据包的数量，建立了一个二维Markov链模型。利用矩阵几何解方法求出系统的稳态分布，给出了认知用户的数据包平均延迟、吞吐量以及信道切换率等性能指标的表达式。实验结果表明，所提出的集中式认知无线网络频谱分配策略有效地提高了认知用户的吞吐量，降低了信道切换率。考虑不同的性能指标之间存在着折中关系，建立了一个系统收益函数，给出了超时隙大小的优化设置方案。 |
| 英文摘要: |
| Letting primary users access spectrum with preemptive priority at the boundary of a super slot,cognitive users transmit their data packets in a slot structure,a novel centralized spectrum allocation strategy for cognitive radio networks is proposed.Combining the sequence number of the current slot in a super slot and the number of data packets for the cognitive users in the system,a two dimensional Markov chain model is established.By using the method of matrix geometry solutions,the system model in steady state is analyzed,and the performance measures for the cognitive users,such as the throughput,the average latency of data packets and the spectrum switching ratio,are given accordingly.The experimental results show that the new centralized spectrum allocation strategy can improve the throughput,lower the spectrum switching ratio.Considering the trade off between different performance measures,a profit function is constructed to optimize the number of slots in a super slot. |
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