Throughput-efficient sequential channel sensing and probing in cognitive radio networks under sensing errors

Tao Shu, Marwan Krunz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

94 Scopus citations

Abstract

In this paper, we exploit channel diversity for opportunistic spectrum access (OSA). Our approach uses channel quality as a second criterion (along with the idle/busy status of the channel) in selecting channels to use for opportunistic transmission. The difficulty of the problem comes from the fact that it is practically infeasible for a CR to first scan all channels and then pick the best among them, due to the potentially large number of channels open to OSA and the limited power/hardware capability of a CR. As a result, the CR can only sense and probe channels sequentially. To avoid collisions with other CRs, after sensing and probing a channel, the CR needs to make a decision on whether to terminate the scan and use the underlying channel or to skip it and scan the next one. The optimal use-or-skip decision strategy that maximizes the CR's average throughput is one of our primary concerns in this study. This problem is further complicated by practical considerations, such as sensing/probing overhead and sensing errors. An optimal decision strategy that addresses all the above considerations is derived by formulating the sequential sensing/probing process as a rate-of-return problem, which we solve using optimal stopping theory. We further explore the special structure of this strategy to conduct a "second-round" optimization over the operational parameters, such as the sensing and probing times. We show through simulations that significant throughput gains (e.g., about 100%) are achieved using our joint sensing/probing scheme over the conventional one that uses sensing alone.

Original languageEnglish (US)
Title of host publicationMobiCom'09 - Proceedings of the Annual International Conference on Mobile Computing and Networking
Pages37-48
Number of pages12
DOIs
StatePublished - Nov 30 2009
Event15th Annual ACM International Conference on Mobile Computing and Networking, MobiCom 2009 - Beijing, China
Duration: Sep 20 2009Sep 25 2009

Publication series

NameProceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM

Other

Other15th Annual ACM International Conference on Mobile Computing and Networking, MobiCom 2009
CountryChina
CityBeijing
Period9/20/099/25/09

    Fingerprint

Keywords

  • Cognitive radio networks
  • Opportunistic spectrum access
  • Optimal stopping theory
  • Spectrum sensing and probing

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications

Cite this

Shu, T., & Krunz, M. (2009). Throughput-efficient sequential channel sensing and probing in cognitive radio networks under sensing errors. In MobiCom'09 - Proceedings of the Annual International Conference on Mobile Computing and Networking (pp. 37-48). (Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM). https://doi.org/10.1145/1614320.1614325