[Back]

S. Homayouni, S. A. Ghorashi:
"The Impact of Queue on Opportunistic based Cognitive Radio Networks";
in: "Journal of Computing", VOLUME 3, ISSUE 7; IEEE Communications Society, 2011, ISSN: 2151-9617, 9 - 14.

In cognitive radio systems which include primary and secondary networks, dynamic spectrum sharing methods are implemented in order to provide more spectrum access opportunities for secondary users without interference to the primary ones. In this paper, we investigate the impact of queuing secondary users on the cognitive radio system performance. Resource sharing process in the considered system is modeled by a two-dimensional Markov chain and performance metrics such as blocking and dropping probabilities, mean waiting time and channel utilization for different populations of secondary users are computed and compared. Both analytical and simulation results show that in the presence of queue, the dropping probability of secondary users decreases intensively with the cost of increasing secondary users´ blocking probabilities and mean waiting time.

In cognitive radio systems which include primary and secondary networks, dynamic spectrum sharing methods are implemented in order to provide more spectrum access opportunities for secondary users without interference to the primary ones. In this paper, we investigate the impact of queuing secondary users on the cognitive radio system performance. Resource sharing process in the considered system is modeled by a two-dimensional Markov chain and performance metrics such as blocking and dropping probabilities, mean waiting time and channel utilization for different populations of secondary users are computed and compared. Both analytical and simulation results show that in the presence of queue, the dropping probability of secondary users decreases intensively with the cost of increasing secondary users´ blocking probabilities and mean waiting time.

Blocking and dropping probabilities, Cognitive radio, Dynamic spectrum access, Markov chain.

http://www.scribd.com/doc/61944917/The-Impact-of-Queue-on-Opportunistic-based-Cognitive-Radio-Networks