Co-primary Spectrum Sharing for Inter-operator Device-to-Device Communication

Byungjin Cho, Kostas Koufos, Riku Jäntti, Seong-Lyun Kim

Research output: Contribution to journalArticle (Academic Journal)peer-review

18 Citations (Scopus)
315 Downloads (Pure)


The business potential of device-to-device (D2D) communication including public safety and vehicular communications will be realized only if direct communication between devices subscribed to different mobile operators (OPs) is supported. One possible way to implement inter-operator D2D communication may use the licensed spectrum of the OPs, i.e., OPs agree to share spectrum in a co-primary manner, and inter-operator D2D communication is allocated over spectral resources contributed from both parties. In this paper, we consider a spectrum sharing scenario where a number of OPs construct a spectrum pool dedicated to support inter-operator D2D communication. OPs negotiate in the form of a non-cooperative game about how much spectrum each OP contributes to the spectrum pool. OPs submit proposals to each other in parallel until a consensus is reached. When every OP has a concave utility function on the box-constrained region, we identify the conditions guaranteeing the existence of a unique equilibrium point. We show that the iterative algorithm based on the OP’s best response might not converge to the equilibrium point due to myopically overreacting to the response of the other OPs, while the Jacobi-play strategy update algorithm can converge with an appropriate selection of update parameter. Using the Jacobi-play update algorithm, we illustrate that asymmetric OPs contribute an unequal amount of resources to the spectrum pool; However all participating OPs may experience significant performance gains compared to the scheme without spectrum sharing.
Original languageEnglish
Article number7756392
Pages (from-to)91-105
Number of pages15
JournalIEEE Journal on Selected Areas in Communications
Issue number1
Early online date24 Nov 2016
Publication statusPublished - 1 Jan 2017


  • Co-primary spectrum sharing
  • Inter-operator D2D
  • Spectrum pooling
  • Non-cooperative game


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