A New Algorithm of Spectrum Allocation Based on the Balance between Supply and Demand in Cognitive Radio Networks

This paper investigates a new spectrum sharing algorithm based on price in cognitive radio networks. A supply and demand model between primary users and secondary users is established to decide the price of free spectrum leased by primary users. Considering the utility of primary users and the total bandwidth while deciding the price per bandwidth using supply and demand balance (the spectrum supplied by primary users is the same as which demanded by secondary users) and each secondary user competes with each other according to the price to share the available bandwidth allocated by primary users. At the same time, the battery capacity of secondary users and the reliance degree that how primary users trust secondary users in the spectrum sharing process are also considered ,a new secondary utility and spectrum sharing algorithm are designed based on above factors. The existence and uniqueness of Nash equilibrium are proved from both theoretic and simulated aspects. The simulation results show that primary users could receive maximum revenues by allocating spectrum in equilibrium price, and the spectrum shared by secondary users is directly affected by the reliance degree and remaining battery capacity of secondary users.