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面向无线认知网络的冗余感知数据消除 被引量：1

Eliminating Redundant Sensed Data for Wireless Cognitive Networks
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摘要 在无线认知网络的协作式频谱感知方案中,非授权用户(次要用户)将各自感知到的可用频谱信息转发给邻居节点,作为频谱分配的依据.而实际上,仅有部分数据影响着频谱分配的结果.无用信息的传递不仅产生了大量额外的通信开销,而且在频谱分配过程中浪费了计算资源.这种情况对于频谱资源稀缺的无线认知网络和能量有限的认知终端来说是无法接受的.因此,如何减少无用信息的传递是一个具有重大实际意义的问题.基于skyline查询处理,提出了多目标约束下skychannel查询处理方法,以减少冗余感知信息传递.其基本思想是:将数据空间划分为控制区域、被控区域和自由区域,按照信道的性能参数,将要查询的信道放入相应区域.传输时,直接忽略被控信道的信息而仅传输非被控信道的数据.在保证不影响频谱分配结果的前提下,可以大量降低网络开销,节约用户的计算资源.仿真结果显示,skychannel查询方法在节约查询时间、降低通信开销和计算开销等方面具有优势. The unlicensed user （the secondary user） sends the available spectrum information that it sensed to its neighbors as the foundation of spectrum allocation in the distributed spectrum allocation process for wireless cognitive radio networks. In reality only part of the information affects the allocation results. The transmission of redundant data not only generates extra communication cost but also wastes computing resource in the spectrum allocation processand is therefore undesirable for spectrum-scarce CRNs and power-limited cognitive terminals. Thus, it is a practical problem to eliminate the useless data before transmission. Based on skyline query processing, this paper proposes a multiple-objective redundant sensed traffic eliminating algorithm called Sskychannel query processing. The fundamental idea of the algorithm is to divide the channel space into dominate region, dominated region and free region. Each sensed channel will be put into the corresponding region according to its parameters. The information of dominated channels is ignored, and user only transmits the information of non dominated channels. It can decrease the network cost and save the computing resource for each user while guaranteeing not to affect the spectrum allocation result. The experimental results also show the advantages of skychannel query algorithm in terms of decreasing communication cost and saving computing resource.
作者 胡罡 刘丽霞 周航军 黄震 彭宇行
机构地区 国防科学技术大学计算机学院 香港城市大学计算机系
出处 《软件学报》 EI CSCD 北大核心 2014年第5期1113-1124,共12页 Journal of Software
基金 国家重点基础研究发展计划(973)(2011CB302600) 国家自然科学基金(61070211 60903223) 国家高技术研究发展计划(863)(2011AA01A202) 教育部博士点基金(20114307120003)
关键词 SKYLINE查询 无线认知网络 通信开销 计算开销 频谱 skyline query, wireless cognitive network, communication cost, computing cost, spectrum
分类号 TP393 [自动化与计算机技术—计算机应用技术]
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参考文献16

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二级参考文献54

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软件学报
2014年 第5期

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