Differentiated Access Mechanism in Cognitive Radio Networks with Energy-Harvesting Nodes

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• 作者：Yunmin Kim ; Chul Wan Park ; Tae-Jin Lee
• 关键词：Cognitive radio ; Energy ; harvesting ; Secondary user ; MAC protocol
• 刊名：Wireless Personal Communications
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：90
• 期：4
• 页码：2051-2071
• 全文大小：1,102 KB
• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  Signal,Image and Speech Processing
  Processor Architectures
  
• 出版者：Springer Netherlands
• ISSN：1572-834X
• 卷排序：90

文摘

In a cognitive radio network with energy-harvesting secondary nodes, the energy states of nodes may be different depending on the time-varying amount of harvesting and consuming energy. The contention strategy needs to take the effect into consideration to save energy and increase the lifetime of secondary nodes. In this paper, an efficient sensing mechanism and a contention algorithm for a cognitive radio network with energy-harvesting nodes is presented. In order to prevent imminent outage of low energy nodes, higher priorities are given to low energy nodes during contention, which gives more transmission opportunities to low energy nodes before they go into the sleep mode. We propose to use differentiated access probabilities and contention windows for different energy levels. By utilizing the access probabilities of secondary nodes, the number of the contending nodes and the energy consumption decrease. The differentiated contention windows ensure the transmission priority of low energy nodes. The proposed MAC protocol is shown to enhance throughput and energy efficiency. The throughput and energy efficiency of the proposed MAC are investigated via analysis by a Markov chain and simulations.