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Dynamic spectrum access DSA scheme in Cognitive Radio CR can solve the current problem of scarce spectrum resource effectively, in which the unlicensed users i.e. Second Users, SUs can access the licensed spectrum in opportunistic ways without interference to the licensed users i.e. Primary Users, PUs. However, SUs have to vacate the spectrum because of PUs coming, in this case the spectrum switch occurs, and it leads to the increasing of SUs’ delay. In this paper, we proposed a Variable Service Rate VSR scheme with the switch buffer as to real-time traffic such as VoIP, Video, in order to decrease the average switch delay of SUs and improve the other performance. Different from previous studies, the main characteristics of our studying of VSR in this paper as follows: 1 Our study is on the condition of real-time traffic and we establish three-dimension Markov model; 2 Using the internal optimization strategy, including switching buffer, optimizing buffer and variable service rate; 3 As to the real-time traffic, on the condition of meeting the Quality of ServiceQoS on dropping probability, the average switch delay is decreased as well as improving the other performance. By extensive simulation and numerical analysis, the performance of real-time traffic is improved greatly on the condition of ensuring its dropping probability. The result fully demonstrates the feasibility and effectiveness of the variable service rate scheme.

KEYWORDS

Cognitive Radio; Dynamic Spectrum Access; Variable Service Rate; Optimal Buffer; Markov Decision

Cite this paper

Peng, Q. , Dong, Y. , Wu, W. , Rao, H. and Liu, G. 2013 Dynamic Spectrum Access Scheme of Variable Service Rate and Optimal Buffer-Based in Cognitive Radio. Communications and Network, 5, 232-237. doi: 10.4236-cn.2013.53B2043.





Autor: Qiang Peng, Youchen Dong, Weimin Wu, Haiyang Rao, Gan Liu

Fuente: http://www.scirp.org/



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