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Unmanned Aerial Vehicle (UAV) has been recognized as a promising way toassist future wireless communications due to its high flexibility of deploymentand scheduling. In this paper, we focus on temporarily deployed UAVs thatprovide downlink data offloading in some regions under a macro base station(MBS). Since the manager of the MBS and the operators of the UAVs could be ofdifferent interest groups, we formulate the corresponding spectrum tradingproblem by means of contract theory, where the manager of the MBS has to designan optimal contract to maximize its own revenue. Such contract comprises a setof bandwidth options and corresponding prices, and each UAV operator onlychooses the most profitable one from all the options in the whole contract. Weanalytically derive the optimal pricing strategy based on fixed bandwidthassignment, and then propose a dynamic programming algorithm to calculate theoptimal bandwidth assignment in polynomial time. By simulations, we compare theoutcome of the MBS optimal contract with that of a social optimal one, and findthat a selfish MBS manager sells less bandwidth to the UAV operators.

UAV Offloading: Spectrum Trading Contract Design for UAV Assisted 5G Networks