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Information 2017, 8(4), 119; doi:10.3390/info8040119

A Dynamic Spectrum Allocation Algorithm for a Maritime Cognitive Radio Communication System Based on a Queuing Model

1
Information Science and Technology College, Dalian Maritime University, Dalian 116026, China
2
China Transport Telecommunications & Information Center, Beijing 100011, China
*
Author to whom correspondence should be addressed.
Received: 23 August 2017 / Revised: 15 September 2017 / Accepted: 26 September 2017 / Published: 27 September 2017
(This article belongs to the Section Information Theory and Methodology)
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Abstract

With the rapid development of maritime digital communication, the demand for spectrum resources is increasing, and building a maritime cognitive radio communication system is an effective solution. In this paper, the problem of how to effectively allocate the spectrum for secondary users (SUs) with different priorities in a maritime cognitive radio communication system is studied. According to the characteristics of a maritime cognitive radio and existing research about cognitive radio systems, this paper establishes a centralized maritime cognitive radio communication model and creates a simplified queuing model with two queues for the communication model. In the view of the behaviors of SUs and primary users (PUs), we propose a dynamic spectrum allocation (DSA) algorithm based on the system status, and analyze it with a two-dimensional Markov chain. Simulation results show that, when different types of SUs have similar arrival rates, the algorithm can vary the priority factor according to the change of users’ status in the system, so as to adjust the channel allocation, decreasing system congestion. The improvement of the algorithm is about 7–26%, and the specific improvement is negatively correlated with the SU arrival rate. View Full-Text
Keywords: maritime cognitive radio communication system; spectrum allocation algorithm; queuing model with two queues; priority factor; two-dimensional Markov chain maritime cognitive radio communication system; spectrum allocation algorithm; queuing model with two queues; priority factor; two-dimensional Markov chain
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Zhang, J.; Yang, J.; Zhang, Y.; Zhang, S. A Dynamic Spectrum Allocation Algorithm for a Maritime Cognitive Radio Communication System Based on a Queuing Model. Information 2017, 8, 119.

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