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首页> 外文会议>2011 7th International Wireless Communications and Mobile Computing Conference >A novel channel handover strategy to improve the throughput in cognitive radio networks
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A novel channel handover strategy to improve the throughput in cognitive radio networks

机译：一种新颖的信道切换策略，可提高认知无线电网络的吞吐量

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摘要

Cognitive radio (CR) is the most promising solution to spectrum scarcity and spectrum underutilization problems. Most of the research in CR design ignores the cost of channel handover process (CHP) in cognition cycle. However, CHP can be a time consuming process that consists of spectrum sensing, spectrum decision, negotiation through control channel, and adjustment of frequency and modulation settings. Taking all of these steps into account, we deduce that the frequency of CHP is one of the most critical CR design issues. In this sense, initiating the CHP after detecting each primary user (PU) activity can decrease the aggregated spectrum utilization. In this paper, we analyze the trade-off between initiating a CHP to find an idle channel and staying in the current data channel for a while to catch free slots when some PU activity is detected. We propose a novel channel handover strategy (CHS) to balance this trade-off. In this CHS, secondary users (SUs) track only their current data channel and do not need information about the whole spectrum environment to determine whether to start CHP or not. Simulation results show that the proposed CHS can clearly decrease the frequency of handovers and increase the aggregated SU utilization.
机译：认知无线电（CR）是解决频谱短缺和频谱利用不足问题的最有希望的解决方案。 CR设计的大多数研究都忽略了认知周期中信道切换过程（CHP）的成本。但是，CHP可能是一个耗时的过程，其中包括频谱感测，频谱决策，通过控制信道的协商以及频率和调制设置的调整。考虑到所有这些步骤，我们推断出CHP的频率是最关键的CR设计问题之一。从这个意义上讲，在检测到每个主要用户（PU）活动之后启动CHP可能会降低聚合频谱利用率。在本文中，我们分析了在检测到某些PU活动时启动CHP以查找空闲信道与在当前数据信道中停留一段时间以捕获空闲时隙之间的权衡。我们提出了一种新颖的信道切换策略（CHS），以平衡这种权衡。在此CHS中，辅助用户（SU）仅跟踪其当前数据通道，不需要有关整个频谱环境的信息来确定是否启动CHP。仿真结果表明，所提出的CHS可以明显降低切换频率，并提高SU的综合利用率。

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