7th International Conference on Cognitive Radio Oriented Wireless Networks

Research Article

An Analysis of Competition among Autonomous Devices in Multichannel Cognitive Radios Networks

Download148 downloads
  • @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
Zaheer Khan1,*, Janne Lehtomäki1, Luiz DaSilva2, Markku Juntti3
  • 1: CWC, University of Oulu, Finland
  • 2: Virginia Tech, USA, and Trinity College Dublin, Ireland
  • 3: CWC University of Oulu, Oulu, Finland
*Contact email: zaheer@ee.oulu.fi

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.