TY - GEN
T1 - A novel channel handover strategy to improve the throughput in cognitive radio networks
AU - Kahraman, Beycan
AU - Buzluca, Feza
PY - 2011
Y1 - 2011
N2 - Cognitive radio (CR) is the most promising solution to spectrum scarcity and spectrum underutilization problems. Most of the research in CR design ignores the cost of channel handover process (CHP) in cognition cycle. However, CHP can be a time consuming process that consists of spectrum sensing, spectrum decision, negotiation through control channel, and adjustment of frequency and modulation settings. Taking all of these steps into account, we deduce that the frequency of CHP is one of the most critical CR design issues. In this sense, initiating the CHP after detecting each primary user (PU) activity can decrease the aggregated spectrum utilization. In this paper, we analyze the trade-off between initiating a CHP to find an idle channel and staying in the current data channel for a while to catch free slots when some PU activity is detected. We propose a novel channel handover strategy (CHS) to balance this trade-off. In this CHS, secondary users (SUs) track only their current data channel and do not need information about the whole spectrum environment to determine whether to start CHP or not. Simulation results show that the proposed CHS can clearly decrease the frequency of handovers and increase the aggregated SU utilization.
AB - Cognitive radio (CR) is the most promising solution to spectrum scarcity and spectrum underutilization problems. Most of the research in CR design ignores the cost of channel handover process (CHP) in cognition cycle. However, CHP can be a time consuming process that consists of spectrum sensing, spectrum decision, negotiation through control channel, and adjustment of frequency and modulation settings. Taking all of these steps into account, we deduce that the frequency of CHP is one of the most critical CR design issues. In this sense, initiating the CHP after detecting each primary user (PU) activity can decrease the aggregated spectrum utilization. In this paper, we analyze the trade-off between initiating a CHP to find an idle channel and staying in the current data channel for a while to catch free slots when some PU activity is detected. We propose a novel channel handover strategy (CHS) to balance this trade-off. In this CHS, secondary users (SUs) track only their current data channel and do not need information about the whole spectrum environment to determine whether to start CHP or not. Simulation results show that the proposed CHS can clearly decrease the frequency of handovers and increase the aggregated SU utilization.
KW - channel handover strategies
KW - cognitive radio
KW - cost of channel handover
KW - dynamic spectrum access
UR - http://www.scopus.com/inward/record.url?scp=80052486880&partnerID=8YFLogxK
U2 - 10.1109/IWCMC.2011.5982515
DO - 10.1109/IWCMC.2011.5982515
M3 - Conference contribution
AN - SCOPUS:80052486880
SN - 9781424495399
T3 - IWCMC 2011 - 7th International Wireless Communications and Mobile Computing Conference
SP - 107
EP - 112
BT - IWCMC 2011 - 7th International Wireless Communications and Mobile Computing Conference
T2 - 7th International Wireless Communications and Mobile Computing Conference, IWCMC 2011
Y2 - 4 July 2011 through 8 July 2011
ER -