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Modelling and Simulation in Engineering
Volume 2014, Article ID 406462, 12 pages
Research Article

Achieving Fair Spectrum Allocation and Reduced Spectrum Handoff in Wireless Sensor Networks: Modeling via Biobjective Optimization

1Department of Computer Engineering, Catholic University of Pusan, Busan, Republic of Korea
2Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim, Norway
3Rikshospitalet, Oslo University Hospital, Oslo, Norway
4School of Information Technology Engineering, Catholic University of Daegu, Gyeongsan, Gyeongbuk, Republic of Korea

Received 26 June 2014; Accepted 12 August 2014; Published 3 September 2014

Academic Editor: James J. Park

Copyright © 2014 Sang-Seon Byun 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.


This paper considers the problem of centralized spectrum allocations in wireless sensor networks towards the following goals: (1) maximizing fairness, (2) reflecting the priority among sensor data, and (3) avoiding unnecessary spectrum handoff. We cast this problem into a multiobjective mixed integer nonconvex nonlinear programming that is definitely difficult to solve at least globally without any aid of conversion or approximation. To tackle this intractability, we first convexify the original problem using arithmetic-geometric mean approximation and logarithmic change of the decision variables and then deploy weighted Chebyshev norm-based scalarization method in order to collapse the multiobjective problem into a single objective one. Finally, we apply simple rounding method in order to obtain approximate integer solutions. The results obtained from the numerical experiments show that, by adjusting the weight on each objective function, the proposed algorithm allocates spectrum bands fairly with well observing each sensor’s priority and reduced spectrum handoffs.