Journal of Central South University

, Volume 18, Issue 5, pp 1532–1544 | Cite as

Distributed multichannel medium access control protocol without common control channel for single-hop cognitive radio networks

  • Gui-sen Xu (徐贵森)Email author
  • Xue-zhi Tan (谭学治)


A novel distributed cognitive radio multichannel medium access protocol without common control channel was proposed. The protocol divided a transmission interval into two parts for exchanging control information and data, respectively. In addition to evaluating system saturation throughput of the proposed protocol, a three-dimensional multi channel Markov chain model to describe the sate of the cognitive users (CUs) in dynamic spectrum access was presented. The proposed analysis was applied to the packet transmission schemes employed by the basic, RTS/CTS access mechanism adopted in the normal IEEE 802.11. Analyzing the advantage of the two methods, a hybrid access mechanism was proposed to improve the system throughput. The simulation results show that the experiment results are close to the value computed by the model (less than 5%), and the proposed protocol significantly improves the performance of the system throughput by borrowing the licensed spectrum. By analyzing the dependence of throughput on system parameters, hybrid mechanism dynamically selecting access mechanism can maintain high throughput.

Key words

cognitive radio network multichannel cognitive radio MAC (medium access control) protocols performance evaluation saturation throughput 


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Copyright information

© Central South University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Gui-sen Xu (徐贵森)
    • 1
    Email author
  • Xue-zhi Tan (谭学治)
    • 1
  1. 1.Department of Communication Research CenterHarbin Institute of TechnologyHarbinChina

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