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M. Khoshkholgh, K. Navaie and H. Yanikomeroglu, “Access Strategies for Spectrum Sharing in Fading Environment: Overlay, Underlay, and Mixed,” IEEE Journal on Mobile Computing, Vol. 9, No. 12, 2010, pp. 1780-1793. doi:10.1109/TMC.2010.57

has been cited by the following article:

• TITLE: Throughput Maximization Based on Optimal Access Probabilities in Cognitive Radio System

  AUTHORS: Mohamed Elalem, Lian Zhao

  KEYWORDS: Cognitive Radio; Access Probability; Underlay/Overlay Schemes; Marckov Model

  JOURNAL NAME: Communications and Network, Vol.5 No.3, August 2, 2013

  ABSTRACT: Well-established fact shows that the fixed spectrum allocation policy conveys to the low spectrum utilization. The cognitive radio technique promises to improve the low efficiency. This paper proposes an optimized access strategy combining overlay scheme and underlay scheme for the cognitive radio. We model the service state of the system as a continuous-time Markov model. Based on the service state, the overlay manner or/and the underlay manner is/are used by the secondary users. When the primary user is not transmitting and only one secondary user has the requirement to transmit, the secondary system adopts the overlay scheme. When the primary user is transmitting and the secondary users want to transmit simultaneously, an underlay scheme with an access probability is adopted. We obtain the optimal access probability in a closed form which maximizes the overall system throughput.