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In this paper, the transmit power minimizing of Unmanned Aerial Vehicles (UAVs) which are deployed as aerial base stations is investigated. We assume that the UAVs operate under the frequency division multiple access (FDMA) technique to provide wireless services to the ground users distributed in hotspot area. For the given locations of UAVs and cell association of users, we minimize the transmit power of UAVs under the fair bandwidth allocation satisfying the user data rate requirement using convex optimization. Our analytical results show that the total transmit power of UAVs can be reduced by allocating the bandwidth fairly.