naa a22 4500 51079341X CHVBK 20180411083327.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11277-012-0689-0 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0689-0 Adaptive and Distributed Access to Spectrum Holes in Cognitive Radio System [Elektronische Daten] [Kae Choi, Wha Jeon, Dong Jeong] Cognitive radio technology enables Secondary Users (SUs) to access the frequency channels licensed to Primary Users. In this paper, we propose a novel dynamic multichannel access scheme for cognitive radio systems, which are based on a multichannel variation of a p-persistent Carrier Sensing Multiple Access scheme. To optimize the system-wide performance, the proposed scheme exploits different gains of frequency channels due to frequency-selective fading. With the proposed scheme, SUs share frequency channels in a fully distributed way, without any explicit control information exchange. To design the proposed scheme, we formulate the whole system as a "channel access game,” according to game-theoretic framework. In the channel access game, the utility function should reflect the system-wide performance. We derive closed-form performance measures by modelling the system as a continuous time Markov chain, and use them to construct a proper utility function. Then, each SU independently decides its own channel access strategy (i.e., the distribution of the random backoff time) which optimizes the utility function. The simulation results show that the proposed scheme promotes SUs to compete and cooperate with each other to a suitable level and, as a result, performs well in all range of SU population. Springer Science+Business Media, LLC., 2012 Cognitive radio nationallicence Open spectrum nationallicence Game theory nationallicence Cooperation nationallicence Markovian analysis nationallicence Optimization nationallicence Choi Kae Department of Computer Science and Engineering, Seoul National University of Science and Technology, 172 Gongreung 2-dong, Nowon-gu, 139-743, Seoul, Korea aut Jeon Wha Department of Electrical Engineering and Computer Science, Seoul National University, 151-742, Seoul, Korea aut Jeong Dong Department of Electronics Engineering, Hankuk University of Foreign Studies, 449-791, Yongin-si, Kyonggi-do, Korea aut Wireless Personal Communications Springer US; http://www.springer-ny.com 70/1(2013-05-01), 207-226 0929-6212 70:1<207 2013 70 11277 https://doi.org/10.1007/s11277-012-0689-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0689-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Choi Kae Department of Computer Science and Engineering, Seoul National University of Science and Technology, 172 Gongreung 2-dong, Nowon-gu, 139-743, Seoul, Korea aut NATIONALLICENCE 700 1- Jeon Wha Department of Electrical Engineering and Computer Science, Seoul National University, 151-742, Seoul, Korea aut NATIONALLICENCE 700 1- Jeong Dong Department of Electronics Engineering, Hankuk University of Foreign Studies, 449-791, Yongin-si, Kyonggi-do, Korea aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 70/1(2013-05-01), 207-226 0929-6212 70:1<207 2013 70 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer