5th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications

Research Article

Distributed multichannel random access networks with selfish users

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  • @INPROCEEDINGS{10.4108/ICST.CROWNCOM2010.9284,
        author={Ali Ozyagci and Omer Ileri and Jens Zander},
        title={Distributed multichannel random access networks with selfish users},
        proceedings={5th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2010},
        month={9},
        keywords={Cooperative systems Games Nash equilibrium Object recognition System performance Tin Wireless communication},
        doi={10.4108/ICST.CROWNCOM2010.9284}
    }
    
  • Ali Ozyagci
    Omer Ileri
    Jens Zander
    Year: 2010
    Distributed multichannel random access networks with selfish users
    CROWNCOM
    IEEE
    DOI: 10.4108/ICST.CROWNCOM2010.9284
Ali Ozyagci1,*, Omer Ileri1,*, Jens Zander1,*
  • 1: Royal Institute of Technology, Wireless@KTH, Stockholm, Sweden
*Contact email: ozyagci@kth.se, omer.ileri@uekae.tubitak.gov.tr, jenz@kth.se

Abstract

Dynamic spectrum access (DSA) schemes allow the users to share spectrum resources by taking advantage of the variations in spectrum demand over time and space. Carrying out dynamic spectrum allocation centrally, however, can be a complex task. For this reason, distributed schemes in which users can access the available channels independently may be preferable to centralized DSA schemes. Cognitive radio systems, which enable user terminals to sense their environment and form their action accordingly, are particularly well-suited for distributed systems. On the other hand, the freedom in distributed schemes gives the users the option to act selfishly, which has decisive effects on system performance. In this paper we consider a distributed multichannel wireless random access system where users selfishly access the channels in the system. We analyze the behavior of the selfish users by modeling the system as a non-cooperative game and we identify all stable operating points (Nash equilibria) of this game. We then compare the performance of this system with a number of cooperative distributed DSA schemes in terms of user utilities. Our results show that the performance of the selfish multichannel random access system can be comparable to cooperative schemes.