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See Blockindiscussions, Blockinstats, Blockinand Blockinauthor Blockinprofiles Blockinfor Blockinthis Blockinpublication Models Blockinfor Blockincost-benefit Blockinanalysis Blockinof Blockinrfid Implementations Blockinin Blockinretail Blockinstores
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DOI：
10.1109/tmc.2011.155
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发表时间：
2012
影响因子：
7.9
通讯作者：
Yu
中科院分区：
文献类型：
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作者：
Wen;Jung;Yu
在本文中，我们提出了一个分析框架，以评估认知无线电（CR）网络中基于连接的频谱中断的延迟性能。在次连接的传输周期期间，来自主用户的多次中断导致多次频谱中断，并且需要预先确定用于频谱中断的目标信道集合。为了量化信道过时问题对目标信道预定的影响，我们应该考虑三个关键的设计特征：1）主连接和辅助连接的一般服务时间分布; 2）多个缓冲器中的不同操作信道;以及3）由于来自多个辅助连接的信道竞争而引起的排队延迟。为此，我们提出了抢占式恢复优先级（PRP）M/G/1排队网络模型来表征所有三个设计功能的频谱使用行为。该模型的目的是分析扩展的数据传输时间的辅助连接与主动设计的目标信道序列在不同的流量到达率和服务时间分布。这些分析结果被应用于评估基于连接的频谱切换的延迟性能的基础上的目标信道序列中提到的IEEE 802.22无线区域网络标准。然后，为了减少扩展的数据传输时间，提出了一种业务自适应频谱切换，它改变频谱切换的目标信道序列的基础上的业务条件。与现有的目标信道选择方法相比，这种业务自适应的目标信道选择方法可以减少35%的扩展数据传输时间，特别是对于主用户的重业务负载。
In this paper, we present an analytical framework to evaluate the latency performance of connection-based spectrum handoffs in cognitive radio (CR) networks. During the transmission period of a secondary connection, multiple interruptions from the primary users result in multiple spectrum handoffs and the need of predetermining a set of target channels for spectrum handoffs. To quantify the effects of channel obsolete issue on the target channel predetermination, we should consider the three key design features: 1) general service time distribution of the primary and secondary connections; 2) different operating channels in multiple handoffs; and 3) queuing delay due to channel contention from multiple secondary connections. To this end, we propose the preemptive resume priority (PRP) M/G/1 queuing network model to characterize the spectrum usage behaviors with all the three design features. This model aims to analyze the extended data delivery time of the secondary connections with proactively designed target channel sequences under various traffic arrival rates and service time distributions. These analytical results are applied to evaluate the latency performance of the connection-based spectrum handoff based on the target channel sequences mentioned in the IEEE 802.22 wireless regional area networks standard. Then, to reduce the extended data delivery time, a traffic-adaptive spectrum handoff is proposed, which changes the target channel sequence of spectrum handoffs based on traffic conditions. Compared to the existing target channel selection methods, this traffic-adaptive target channel selection approach can reduce the extended data transmission time by 35 percent, especially for the heavy traffic loads of the primary users.
影响因子：
6.7
作者：
通讯作者：
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