naa a22 4500 51079534X CHVBK 20180411083334.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s11277-012-0620-8 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0620-8 A Cluster-Based MAC Protocol for Cognitive Radio Ad Hoc Networks [Elektronische Daten] [Xiaoyan Li, Fei Hu, Hailin Zhang, Xiaolong Zhang] The cognitive radio (CR) technology is an efficient approach to share the spectrum. But how to access the idle channels effectively is a challenging problem. To solve this problem, we propose a MAC protocol for cluster-based CR ad hoc networks, with the aim of making cluster structure more robust to the primary users' channel re-occupancy activities, so that the CR users can use the idle spectrum more efficiently. Under this framework, a cluster formation algorithm based on available channels, geographical position and experienced statistics is proposed to maximize the network throughput and maintain the cluster topology stability. The schemes for new CR user joining a cluster and cluster maintenance are also designed. An experience database is proposed to store the experienced statistics which are obtained from spectrum occupancy history. Such a database can be used to support the acts of nodes, such as neighbor discovery and cluster forming. Simulation results reveal that our proposed framework not only outperforms conventional CR MAC protocols in terms of throughput and packet delay, but also generates a smaller number of clusters and has more stable cluster structure with less reclustering time. Springer Science+Business Media, LLC., 2012 Cognitive radio nationallicence Ad hoc networks nationallicence MAC protocol nationallicence Clustering nationallicence Li Xiaoyan Xidian University, Xi'an, Shaanxi, People's Republic of China aut Hu Fei University of Alabama, Tuscaloosa, AL, USA aut Zhang Hailin Xidian University, Xi'an, Shaanxi, People's Republic of China aut Zhang Xiaolong Xidian University, Xi'an, Shaanxi, People's Republic of China aut Wireless Personal Communications Springer US; http://www.springer-ny.com 69/2(2013-03-01), 937-955 0929-6212 69:2<937 2013 69 11277 https://doi.org/10.1007/s11277-012-0620-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0620-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Xiaoyan Xidian University, Xi'an, Shaanxi, People's Republic of China aut NATIONALLICENCE 700 1- Hu Fei University of Alabama, Tuscaloosa, AL, USA aut NATIONALLICENCE 700 1- Zhang Hailin Xidian University, Xi'an, Shaanxi, People's Republic of China aut NATIONALLICENCE 700 1- Zhang Xiaolong Xidian University, Xi'an, Shaanxi, People's Republic of China aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 69/2(2013-03-01), 937-955 0929-6212 69:2<937 2013 69 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer