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Dynamic Frequency Selection Method for Medium Access Control in Cognitive Radio Networks  

Jo Kyoung-Jin (인하대학교 정보통신대학원 멀티미디어통신망연구실)
Kim Hyun-Ju (인하대학교 정보통신대학원 멀티미디어통신망연구실)
Roh Kweon-Mun (인하대학교 정보통신대학원 멀티미디어통신망연구실)
Yoo Snag-Jo (인하대학교 정보통신대학원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.7B, 2006 , pp. 632-641 More about this Journal
Abstract
Recently FCC has considered about the unlicensed device operation in licensed bands. However, this operation can give the harmful interference to the existent licensed system while unlicensed devices operate. Therefore, there should be strict requirements to protect licensed system. So in this paper we propose dynamic frequency selection method in the MAC layer, which is based on the cognitive radio technology. The proposed dynamic frequency selection method creates channel lists after sensing the licensed channels. And it helps the CR base station immediately to moves the current channels that are used by the unlicensed system to other available bands dynamically when a licensed system's signal is detected. This method can reduce interference that is caused by unlicensed devices. In addition, it can maximize channel utilization with enabling coexistence of unlicensed system and licensed system.
Keywords
Cognitive Radio; Dynamic Frequency Selection; MAC; CPE; Quiet Period;
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