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Journal of Computer Networks and Communications
Volume 2012 (2012), Article ID 851204, 12 pages
Research Article

The SS-SCR Scheme for Dynamic Spectrum Access

1Department of Electrical Engineering, Indian Institute of Technology, Bombay 400076, India
2Indian Institute of Technology Hyderabad, Yeddumailaram 502205, India

Received 16 December 2011; Revised 24 April 2012; Accepted 1 May 2012

Academic Editor: Torleiv Maseng

Copyright © 2012 Vinay Thumar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We integrate the two models of Cognitive Radio (CR), namely, the conventional Sense-and-Scavenge (SS) Model and Symbiotic Cooperative Relaying (SCR). The resultant scheme, called SS-SCR, improves the efficiency of spectrum usage and reliability of the transmission links. SS-SCR is enabled by a suitable cross-layer optimization problem in a multihop multichannel CR network. Its performance is compared for different PU activity patterns with those schemes which consider SS and SCR separately and perform disjoint resource allocation. Simulation results depict the effectiveness of the proposed SS-SCR scheme. We also indicate the usefulness of cloud computing for a practical deployment of the scheme.