The rapid proliferation of radiocommunication standards and services in recent years is causing the problem of spectrum scarcity. In this context, one of the main objectives of 5G is to facilitate access to the radio spectrum. Our contribution within the framework of this paper is the use of auctions to solve the problem of dynamic spectrum access in the context of 5G using Radio Cognitive (RC) terminals. To achieve this, we have defined a new ecosystem for dynamic spectrum access based on real-time bidding. We assume that the evaluations of the channels made by the secondary operators are dynamic over time. We also formulate the problem of smoothing the budget of the secondary operator in an auction mechanism for access to the primary spectrum. From these considerations, we determine the optimal offer that the secondary operator makes to acquire the spectrum and the income obtained by the primary operator.

Keywords : Dynamic Access, Spectrum, Auction, Cognitive Radio, Ecosystem, Channel Valuation.