Research Article
An Analysis of Competition among Autonomous Devices in Multichannel Cognitive Radios Networks
@INPROCEEDINGS{10.4108/icst.crowncom.2012.248574, author={Zaheer Khan and Janne Lehtom\aa{}ki and Luiz DaSilva and Markku Juntti}, title={An Analysis of Competition among Autonomous Devices in Multichannel Cognitive Radios Networks}, proceedings={7th International Conference on Cognitive Radio Oriented Wireless Networks}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2012}, month={7}, keywords={autonomous cognitive radios multichannel competition}, doi={10.4108/icst.crowncom.2012.248574} }- Zaheer Khan
Janne Lehtomäki
Luiz DaSilva
Markku Juntti
Year: 2012
An Analysis of Competition among Autonomous Devices in Multichannel Cognitive Radios Networks
CROWNCOM
IEEE
DOI: 10.4108/icst.crowncom.2012.248574
Abstract
We investigate an autonomous opportunistic spectrum access (OSA) strategy for a multichannel cognitive radio (CR) network, where two or more autonomous CRs sense the channels sequentially in some sensing order to find a free channel to transmit on, if one exists. We evaluate the performance of the OSA strategy in terms of probability of success (probability that a given CR finds a channel free), mean time of success and throughput achievable by a CR. Surprisingly, we find that, when the number of potentially available channels is not large as compared to the number of CRs in the network, then having more free channels beyond a certain number actually hurts the CRs. This counter-intuitive result stems from an increased number of collisions among the autonomous CRs. To validate the closed form expressions that are derived in this paper, we compare our results to those obtained via simulations.