Analysis of Quiet Period Scheduling in QP-CSMA-CA Cognitive Radio MAC Protocol

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• 作者：S. Senthilmurugan ; T. G. Venkatesh
• 关键词：Quiet period ; Cognitive WLAN ; DIFS based scheduling ; Cognitive MAC protocol
• 刊名：Wireless Personal Communications
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：92
• 期：4
• 页码：1625-1637
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Communications Engineering, Networks; Signal,Image and Speech Processing; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-834X
• 卷排序：92

文摘

In cognitive radio networks (CRN), the secondary network opportunistically access the wireless channels that are free from primary user (PU). Recently, the usage of quiet period (QP) scheduling mechanism to detect transmission opportunities for 802.11 secondary network has gained popularity.The QP-CSMA-CA is a 802.11 based CRN MAC protocol that uses DIFS-based QP scheduling mechanism. In this paper, we propose an analytical model for DIFS-based QP scheduling mechanism. We study the impact of number of secondary nodes on QP scheduling and on their throughput and delay. The access point of 802.11 secondary network can use our analytical model to map the optimal QP scheduling interval \(T_{QP}\) (in time units) to the number of DIFS occurrences \(N_{DIFS}\) which is required for QP-CSMA-CA MAC protocol to detect the reappearance of PU. We validate our mathematical model in finding the optimal \(N_{DIFS}\) through extensive MATLAB simulation.