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A Frequency Allocation Method for Cognitive Radio Using the Fuzzy Set Theory  

Lee, Moon-Ho (청운대학교 멀티미디어학과)
Lee, Jong-Chan (군산대학교 컴퓨터정보공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.9B, 2008 , pp. 745-750 More about this Journal
Abstract
In a cognitive radio based system, quality of service (QoS) for the secondary user must be maintained as much as possible even while that of the primary user is protected all he time. In particular, switching wireless links for the secondary user during the transmission of multimedia data causes delay and information loss, and QoS degradations occur inevitably. The efficient resource management scheme is necessary to support the seamless multimedia service to the secondary user. This paper proposes a novel frequency selection method based on Multi-Criteria Decision Making (MCDM), in which uncertain parameters such as received signal strength, cell load, data rate, and available bandwidth are considered during the decision process for the frequency selection with the fuzzy set theory. Through simulation, we show that our proposed frequency selection method provides a better performance than the conventional methods which consider the received signal strength only.
Keywords
Cognitive radio; QoS; Channel Allocation; Fuzzy set theory; Seamless multimedia service;
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