KSII Transactions on Internet and Information Systems (TIIS)

Korean Society for Internet Information (한국인터넷정보학회)
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Contract Theory Based Cooperative Spectrum Sharing with Joint Power and Bandwidth Optimization

  • Lu, Weidang (College of Information Engineering, Zhejiang University of Technology) ;
  • He, Chenxin (College of Information Engineering, Zhejiang University of Technology) ;
  • Lin, Yuanrong (College of Information Engineering, Zhejiang University of Technology) ;
  • Peng, Hong (College of Information Engineering, Zhejiang University of Technology) ;
  • Liu, Xin (School of Electronic Information and Electrical Engineering, Dalian University of Technology)
  • Received : 2017.03.29
  • Accepted : 2017.08.20
  • Published : 2017.12.31
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Abstract

In this paper, we proposed a contract theory based cooperative spectrum sharing scheme with joint power and bandwidth optimization under asymmetric information, where the primary user (PU) does not know the secondary users' (SUs) private information. To improve performance, PU needs to provide incentives to stimulate nearby SUs to help forward its signal. By using contract theory, PU and SUs' negotiations are modeled as a labor market. PU and SUs act as the employer and employees, respectively. Specifically, SUs provide labor (i.e. the relay power, which can be used for forwarding PU's signal) in exchange for the reward (i.e. the spectrum access bandwidth which can be used for transmitting their own signals). PU needs to overcome a challenge how to balance the relationship between contributions and incentives for the SUs. We study the optimal contract design which consists of relay power and spectrum access bandwidth allocation. We show that the most efficient SUs will be hired by the PU to attend the cooperative communication. PU can achieve the same maximum utility as in the symmetric information scenario. Simulation results confirm that the utility of PU is significantly enhanced with our proposed cooperative spectrum sharing scheme.

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References

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