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CRAHNs: Cognitive radio ad hoc networks

Published: 01 July 2009 Publication History

Abstract

Cognitive radio (CR) technology is envisaged to solve the problems in wireless networks resulting from the limited available spectrum and the inefficiency in the spectrum usage by exploiting the existing wireless spectrum opportunistically. CR networks, equipped with the intrinsic capabilities of the cognitive radio, will provide an ultimate spectrum-aware communication paradigm in wireless communications. CR networks, however, impose unique challenges due to the high fluctuation in the available spectrum as well as diverse quality-of-service (QoS) requirements. Specifically, in cognitive radio ad hoc networks (CRAHNs), the distributed multi-hop architecture, the dynamic network topology, and the time and location varying spectrum availability are some of the key distinguishing factors. In this paper, intrinsic properties and current research challenges of the CRAHNs are presented. First, novel spectrum management functionalities such as spectrum sensing, spectrum sharing, and spectrum decision, and spectrum mobility are introduced from the viewpoint of a network requiring distributed coordination. A particular emphasis is given to distributed coordination between CR users through the establishment of a common control channel. Moreover, the influence of these functions on the performance of the upper layer protocols, such as the network layer, and transport layer protocols are investigated and open research issues in these areas are also outlined. Finally, a new direction called the commons model is explained, where CRAHN users may independently regulate their own operation based on pre-decided spectrum etiquette.

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Published In

cover image Ad Hoc Networks
Ad Hoc Networks  Volume 7, Issue 5
July, 2009
231 pages

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Elsevier Science Publishers B. V.

Netherlands

Publication History

Published: 01 July 2009

Author Tags

  1. Ad hoc networks
  2. Cognitive radio
  3. Common control channel
  4. Commons model
  5. Medium access control protocol
  6. Routing protocol
  7. Spectrum decision
  8. Spectrum mobility
  9. Spectrum sensing
  10. Spectrum sharing
  11. Transport protocol

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