认知无线电网络中基于排队论的集中式频谱分配策略

Queuing theory based centralized dynamic spectrum allocation scheme in cognitive radio networks

传统的基于图着色模型和基于博弈论模型的动态频谱分配算法因存在计算复杂度高、收敛速度慢等缺陷,在实际网络环境中会造成很大的时延和能耗开销。针对主次用户共存,主用户交替转移忙闲状态的网络环境下,基于排队论模型提出了一种高效、低能耗的集中式频谱分配方案,并给出了该方案下次要用户的平均阻塞率和强制中断率的解析表达式。理论分析和仿真结果表明,所提的方案能够大幅度降低节点能耗。

The traditional dynamic spectrum allocation （DSA） algorithms such as coloring based and game theory based algo- rithms had the shortcomings of high energy consumption and computational complexity, and thus were not suitable in practical. This paper proposed a high efficiency and low energy consumption DSA scheme based on queuing theory while PU and SUs co- exist in the same CRN and each PU could be either active （ON） or inactive （OFF） in any given slot. Analytical expressions of some key network parameters including the average block probability and the break probability of secondary user under the proposed scheme was given. Besides, simulations are conducted to verify the effectiveness of the proposed scheme, with ad- vantages lower energy consumption