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首页> 外文期刊>IEEE Communications Magazine >COGNITIVE RADIOS FOR DYNAMIC SPECTRUM ACCESS - Dynamic Frequency Hopping Communities for Efficient IEEE 802.22 Operation
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COGNITIVE RADIOS FOR DYNAMIC SPECTRUM ACCESS - Dynamic Frequency Hopping Communities for Efficient IEEE 802.22 Operation

机译：动态频谱访问的认知无线电-高效IEEE 802.22操作的动态跳频社区

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One of the key challenges of the emerging cognitive radio-based IEEE 802.22 wireless regional area networks (WRANs) is to address two apparently conflicting requirements: ensuring QoS satisfaction for WRAN services while providing reliable spectrum sensing for guaranteeing licensed user protection. To perform reliable sensing, in the basic operation mode on a single frequency band (non-hopping mode), one must allocate quiet times, that is, periodically interrupt data transmission that could impair the QoS of WRAN. This critical issue can be addressed by an alternative operation mode proposed in 802.22 called dynamic frequency hopping (DFH), where WRAN data transmission is performed in parallel with spectrum sensing without interruptions. DFH community, as described in this article, is a mechanism that coordinates multiple WRAN cells operating in the DFH mode, such that efficient frequency usage and reliable channel sensing are achieved. The key idea of DFH community is that neighboring WRAN cells form cooperating communities that coordinate their DFH operations
机译：新兴的基于认知无线电的IEEE 802.22无线区域网络（WRAN）的主要挑战之一是解决两个明显矛盾的要求：确保WRAN服务的QoS满意度，同时提供可靠的频谱感知以保证获得许可的用户保护。为了执行可靠的检测，在单个频带上的基本操作模式（非跳频模式）中，必须分配静默时间，即定期中断可能损害WRAN QoS的数据传输。可以通过在802.22中提出的称为动态跳频（DFH）的另一种操作模式来解决此关键问题，在该模式下，WRAN数据传输与频谱感测并行进行而不会中断。如本文所述，DFH社区是一种机制，用于协调以DFH模式运行的多个WRAN小区，从而实现有效的频率使用和可靠的信道感测。 DFH社区的关键思想是，相邻的WRAN小区形成协作社区，以协调其DFH操作

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