Title: Adaptive QoS-aware channel access scheme for Cognitive Radio networks

Authors: Li Zhang, Guoxin Zheng

Addresses: School of Communication and Information Engineering, Shanghai University, Room 1017, Xingjian Building, No. 149, Yanchang Road, 200072 Shanghai, China. ' School of Communication and Information Engineering, Shanghai University, Room 1017, Xingjian Building, No. 149, Yanchang Road, 200072 Shanghai, China

Abstract: This paper proposes a three-dimensional traffic model, which can identify and utilise those under-utilised channel opportunities efficiently. Based on this model, an opportunistic channel access scheme, named Adaptive Opportunistic Channel Access (AOCA) schedule algorithm, is presented. It can adaptively schedule channel sensing leveraging the Media Access Control (MAC) layer decisions and maximise channel utilisation without imposing any additional burden on CUs and extra interference on licensed users. Moreover, it can provide cognitive users with Quality of Service (QoS) support. Finally, the simulation results demonstrate that the proposed channel schedule scheme can utilise the channel effectively and flexibly in CR networks.

Keywords: adaptive channel access; buffer space; queue length; cognitive radio networks; media access control; MAC; network traffic modelling; QoS; quality of service; opportunistic channel access; channel utilisation; simulation.

DOI: 10.1504/IJAHUC.2010.034970

International Journal of Ad Hoc and Ubiquitous Computing, 2010 Vol.6 No.3, pp.172 - 182

Published online: 31 Aug 2010 *

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