联合包调度频谱切换和功率分配的跨层设计方案
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摘要
针对认知无线网络频谱切换造成系统吞吐量损失和切换延迟较大的问题,提出了联合包调度频谱切换和功率分配的跨层设计方案。该方案根据连续时间马尔科夫链模型预测信道状态信息,调度器采用包调度算法对预繁忙信道次用户进行调度,并重新分配认知节点功率以提升系统吞吐量。仿真结果表明,相对于传统频谱切换算法,该方案可在降低认知用户中断率的同时使系统吞吐量提升约5%。
Aiming at the problem of system throughput loss caused by spectrum hand-off and long delay time of switching,the joint packet scheduling spectrum hand-off and power allocation scheme for cross-layer design scheme was proposed.The scheme predicted the channel state based on the continuous-time Markov chain of primary users'channels.The scheduler adopted packet scheduling algorithm for scheduling the secondary users of the pre-busy channel and reallocation power of the cognitive nodes to maximize the system throughput.Simulation results showed that the proposed scheme could reduce the cognitive users'interruption rate while increasing system throughput by about 5%.
Aiming at the problem of system throughput loss caused by spectrum hand-off and long delay time of switching,the joint packet scheduling spectrum hand-off and power allocation scheme for cross-layer design scheme was proposed.The scheme predicted the channel state based on the continuous-time Markov chain of primary users'channels.The scheduler adopted packet scheduling algorithm for scheduling the secondary users of the pre-busy channel and reallocation power of the cognitive nodes to maximize the system throughput.Simulation results showed that the proposed scheme could reduce the cognitive users'interruption rate while increasing system throughput by about 5%.
引文
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[2]刘俊彤,王可人,张光良,等.基于不同需求等级改进的动态频谱分配算法[J].探测与控制学报,2014,36(1):32-36.
[3]Ali A,Sakhare M,Hwang K,et al.A novel channel indexing based channel selection algorithm for cognitive radio networks[C]//2013International Conference on ICT Convergence(ICTC),Korea,2013:682-687.
[4]Weiss T A,Jondral F K.Spectrum pooling:An innovative strategy for the enhancement of spectrum efficiency[J].IEEE Communications Magazine,2004,42(3):8-14.
[5]唐万斌,喻火根,李少谦.基于信道预测的认知无线电混合频谱切换算法[J].计算机工程与应用,2012,48(27):17-21.
[6]Zhao Z J,Peng Z,Zheng S L,et al.Cognitive radio spectrum allocation using evolutionary algorithms[J].IEEE Transactions on Wireless Communications,2009,8(9):4421-4425.
[7]谭华忠,鲜永菊,徐昌彪.基于分级的频谱切换技术研究[J].计算机工程与应用,2011,47(18):118-121.
[8]Liang Y C,Zeng Y H,Peh E C Y,et al.Sensing throughput tradeoff for cognitive radio networks[J].IEEE Transactions on Wireless Communications,2008,7(4):1326-1337.
[9]Song L,Li L,Zhao C.A Novel Cluster-Based Architecture of Cognitive Wireless Ad-Hoc Networks[C]//Industrial Control and Electronics Engineering(ICICEE),2012International Conference on.2012,8:23-25.
[10]郑仕链,杨小牛.认知无线电频谱切换目标信道访问机制[J].电子与信息学报,2012,34(9):2213-2217.
[11]郭彩丽,曾志民,冯春燕,等.机会频谱接入系统的切换请求排队机制及性能分析[J].电子与信息学报,2009,31(6):1505-1508.
[12]Song Y.ProSpect:A proactive spectrum handoff framework for cognitive radio Ad Hoc networks without commoncontrol chan-nel[J].IEEE Transactions on Mobile Computing,2012,11(7):1127-1139.
[13]Qu D.Detection of non-contiguous OFDM symbols for cognitive radio systems without out-of-band spectrum synchronization[J].IEEE Transactions on Wireless Communications,2011,10(2):693-701.